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1. On the Importance of Highly Resolved Wind Forecasts for Range Estimation

Author: Abel, Rafael, Pegel, Lutz, Waldmann, Andreas, Bargende, Michael, editor, Reuss, Hans-Christian, editor, and Wagner, Andreas, editor
Published: 2022
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2. Adaptive Predictive Energy Management Strategy Example for Electric Vehicle Long Distance Trip

Author: Pavlov, Nikolay, Gigov, Boyko, Stefanova-Pavlova, Maria, Dimitrova, Zlatina, Filipe, Joaquim, Editorial Board Member, Ghosh, Ashish, Editorial Board Member, Kotenko, Igor, Editorial Board Member, Prates, Raquel Oliveira, Editorial Board Member, Zhou, Lizhu, Editorial Board Member, Yilmaz, Murat, editor, Niemann, Jörg, editor, Clarke, Paul, editor, and Messnarz, Richard, editor
Published: 2020
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3. Effect of driving resistances on energy demand and exhaust emission in motor vehicles.

Author: JAWORSKI, Artur, LEJDA, Kazimierz, and BILSKI, Maciej
Subjects: MOTOR vehicles, ENERGY demand management, POLLUTANTS, ENERGY consumption, DYNAMOMETER
Abstract: Among the fundamental factors affecting the emissions of internal combustion engines is the resistance to motion acting on the car. This is an important factor to be taken into account when testing cars in conditions simulated on a chassis dynamometer. The dependence of the driving resistance function on vehicle speed is determined on the basis of various methods, the most frequently used of which is the so-called alternative method specified in procedures for the type approval of motor vehicles with respect to the emission of pollutants in exhaust gases. The values adopted in accordance with the alternative method differ from the actual resistance acting on the car in road conditions. This is one of the reasons why the emission of pollutants and the fuel consumption of an engine in real road conditions differs from the values given by the car manufacturer, including the emission limits specified in the standards. This paper presents an evaluation of the influence of driving resistance on the energy demand and emission of pollutants in the exhaust gases by sample passenger car with SI engine fuelled by petrol and LPG. [ABSTRACT FROM AUTHOR]
Published: 2022
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4. Multi-System Coupling DMi Hybrid Vehicle Modeling and Its Performance Analysis Based on Simulation.

Author: Song Li, Puxi Wang, Dong Zeng, Wenjie Peng, and Liu Yang
Subjects: HYBRID electric vehicles, ENERGY management, ENERGY consumption, THERMAL efficiency, COMPUTER simulation
Abstract: Key subsystems, such as driving resistance, component performance, and energy management strategy, determine the power performance and energy consumption of hybrid electric vehicles. Qin Plus performs excellently in fuel consumption due to its low driving resistance, high thermal efficiency of the engine, and multi-factor multi-mode energy management strategy. This article aims to explain the outstanding energy consumption of DMi vehicles by analyzing the driving resistance, component parameters of Qin Plus and introducing the drive modes selection and vehicle energy management strategy through multi-system modeling and simulation. The ultralow fuel consumption of 3.8 L is obtained under the NEDC driving cycle and evaluated by the corresponding experiment. [ABSTRACT FROM AUTHOR]
Published: 2021
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5. Analysis of Driving Dynamics Considering Driving Resistances in On-Road Driving

Author: Jingeun Song and Junepyo Cha
Subjects: on-road driving test, driving dynamics, driving resistance, vehicle speed per positive acceleration, relative positive acceleration, Technology
Abstract: Internal combustion engine emissions are a serious worldwide problem. To combat this, emission regulations have become stricter with the goal of reducing the proportion of transportation emissions in global air pollution. In addition, the European Commission passed the real driving emissions–light-duty vehicles (RDE-LDV) regulation that evaluates vehicle emissions by driving on real roads. The RDE test is significantly dependent on driving conditions such as traffic or drivers. Thus, the RDE regulation has the means to evaluate driving dynamics such as the vehicle speed per acceleration (v·apos) and the relative positive acceleration (RPA) to determine whether the driving during these tests is normal or abnormal. However, this is not an appropriate way to assess the driving dynamics because the v⋅apos and the RPA do not represent engine load, which is directly related to exhaust emissions. Therefore, in the present study, new driving dynamic variables are proposed. These variables use engine acceleration calculated from wheel force instead of the acceleration calculated from the vehicle speed, so they are proportional to the engine load. In addition, a variable of driving dynamics during braking is calculated using the negative wheel force. This variable can be used to improve the accuracy of the emission assessment by analyzing the braking pattern.
Published: 2021
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6. GPS를 이용한 차량 연료차단 관성주행의 감지에 관한 연구.

Author: 고광호
Subjects: ENERGY consumption, ERROR detection (Information theory), INJECTORS, AUTOMOTIVE fuel consumption, FUEL, SPEED
Abstract: The fuel-cut coast-down driving mode is activated when the acceleration pedal is released with transmission gear engaged, and it’s a default function for electronic-controlled engine of vehicles. The fuel economy becomes better because fuel injection stops during fuel-cut driving mode. A fuel-cut detection method is suggested in the study and it’s based on the speed, acceleration and road gradient data from GPS sensor. It detects fuel-cut driving mode by comparing calculated acceleration and realtime acceleration value. The one is estimated with driving resistance in the condition of fuel-cut driving and the other is from GPS sensor. The detection accuracy is about 80% when the method is verified with road driving data. The result is estimated with 9,600 data set of vehicle speed, acceleration, fuel consumption and road gradient from test driving on the road of 12km during 16 minutes, and the road slope is rather high. It’s easy to detect fuel-cut without injector signal obtained by connecting wire. The detection error is from the fact that the variation range of speed, acceleration and road gradient data, used for road resistance force, is larger than the value of fuel consumption data. [ABSTRACT FROM AUTHOR]
Published: 2019
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7. Construction and Experimental Verification of Sloped Terrain Soil Pressure-Sinkage Model

Author: Guanting Pan, Jingbin Sun, Xiaole Wang, Fuzeng Yang, and Zhijie Liu
Subjects: sloped terrain, hillside metal-tracked tractor, pressure-sinkage model, soil sinkage, driving resistance, Agriculture (General), S1-972
Abstract: The construction of a scientific and effective soil pressure-sinkage model under sloped terrain condition has important guiding significance for the investigation of the soil compaction effect. It is also important for the theoretical calculation of driving resistance and design optimization of the undercarriage structure of hillside metal-tracked tractors (HMTs). The classic Bekker’s pressure-sinkage model does not consider the influence of the soil water content, bulk density, slope angle, and other factors; therefore, it cannot be directly used to investigate the relationship between the soil compaction and its sinkage under sloped terrain conditions. To solve this problem, this study first verified that the soil water content and bulk density exert significant effects on the pressure–sinkage relationship under flat terrain condition. Secondly, a pressure-sinkage test was carried out using the quadratic rotation orthogonal combination design method, and the soil water content, density, and slope angle were considered. The pressure-sinkage curves of sloped terrain soils from Yangling and Yangxian in Shaanxi Province, and Huining and Jingning in Gansu Province were obtained. Then the pressure–sinkage parameters (sinkage exponent, cohesive modulus, and frictional modulus) were calculated using the weighted least-squares method. Thirdly, the mathematical relationship between the parameters and the soil water content, bulk density, and slope angle was obtained. Then Bekker’s model was modified to obtain the pressure–sinkage model of sloped terrain. Finally, the control variable method under slope angle of 10°, soil water content of 10%, and bulk density of 2 mg·m−3 were used to validate the model. The results revealed that the root-mean-square error between the calculated pressure value of the model and the measured value of the film pressure sensor was 1.614, 1.601, and 0.822, respectively. In the dynamic operation of a hillside tractor prototype, the calculated pressures between the supporting wheels were close to the measured values. It indicates that the modified soil pressure–sinkage model is more suitable for calculating the force at the bottom of the track between the supporting wheels. It can also provide an important theoretical basis for accurately calculating the pressure–sinkage parameters of sloped terrain soil. Additionally, this approach could provide theoretical and technical support for the rational arrangement of HMT undercarriages to reduce the soil sinkage and driving resistance.
Published: 2021
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8. Entwicklung einer Motorrad Fußrastenanlage

Author: Duringer, Fabian
Subjects: Derivatentwicklung, Design, Digitales Menschenmodell, Aesthetics, Footrest support, Frontloading, Product development process, Fersenschutz, Model platform, Produktentwicklungsprozess, Air resistance, Motorbike, Bremshebel, FEM-Berechnung, Fußrastenträger, Fahrwiderstand, EURO Norm, Driving resistance, Digital human model, Modellplattform, EURO Standard, Fußrastenanlage, Derivative development, Ästhetik, Footrest system, Verordnung Nr. 168/2013, Motorrad, Schalthebel, Gearstick lever, FEM calculation, Brake lever, Footrest, Fußraste, Luftwiderstand, Heel protection, Regulation No. 168/2013
Abstract: Diese Arbeit beschäftigt sich mit der Entwicklung einer kompletten Fußrastenanlage für ein Motorrad, inklusive des Fußbremshebels, des Schalthebels, sowie des Fersenschutzes für die linke und rechte Seite. Das Motorrad basiert auf einer Modellplattform, welche eine ganze Reihe verschiedener Motorradtypen beinhaltet. Bei dem Modell, wofür die hier behandelte Fußrastenanlage entwickelt wird, handelt es sich um einen Supersportler. Bei diesem Motorradtyp werden die Fußrasten des Fahrers verhältnismäßig weit hinten und oben positioniert. Gleichzeitig haben alle Motorräder, welche auf dieser Modellplattform basieren, den gleichen Rahmen, bzw. die gleichen Anbindungspunkte für die Fußrastenanlage am Rahmen. Dies ergibt einen deutlich längeren Fußrastenträger, welcher bei gleichbleibender Prüflast an der Fußraste einer viel höheren Belastung standhalten muss. Deshalb wird ein Fußrastenträger benötigt, welcher den neuen Anforderungen standhält. Das ästhetische Design der Fußrastenanlage basiert auf verschiedenen 2D Sketches, welche von der Design Abteilung des Motorradherstellers zur Verfügung gestellt wurden. Für die weitere Entwicklungsarbeit wurde der Designvorschlag gewählt, welcher am besten mit den technischen Anforderungen vereinbar war. Die konstruktiven Arbeiten wurden auf dem 3D Programm „Creo 4 Parametric“ durchgeführt. Nach dem Festlegen der äußeren Designlinien und dementsprechend der optischen Erscheinung, wechselte der Fokus zur Stabilität des Bauteils. Eine FEM-Berechnung wurde erstellt, um verschiedene Versionen des Fußrastenträgers und des Schalthebels zu überprüfen und für eine Zulassung nach Verordnung Nr. 169/2013 der Europäischen Union vorzubereiten. Mit der finalen Konstruktion wurde eine Fußrastenanlage entwickelt, welche sich nicht nur an die Designkriterien hält, sondern auch den Prüflasten standhält. Der gewählte Herstellungsprozess für den Fußrastenträger sowie den Brems- und Schalthebel ist Schmieden aus Aluminium. Der Fersenschutz hingegen wird aus Kunststoff druckgegossen. Zwar wurde bei der Entwicklung des Fersenschutzes auf eine steife und stabile Konstruktion geachtet, allerdings liegt keine direkte Belastung des Bauteils vor, weshalb auf eine FEA-Berechnung verzichtet werden konnte. Verglichen mit dem Vorgängermodell konnte die Gewichtszunahme durch einen Wechsel des Herstellungsprozesses von Gießen auf Schmieden, trotz deutlich erhöhter Belastungen, auf einem Minimum gehalten werden. Zusätzlich wurde ein ästhetisches Design der gesamten Fußrastenanlage nach Wunsch umgesetzt This thesis deals with the development of a complete footrest system for a motorbike, including the brake and the lever, as well as a heel guard for the left and right side. The motorcycle is based on a model platform, which consists of a complete range of a whole range of different motorbike types. The model for which the footrest system discussed here is being developed is a supersports bike. On this type of motorbike, the rider's footrests are positioned relatively far back and up. At the same time, all motorbikes based on this model platform have the same frame or the same connection points for the footrest system on the frame. This results in a significantly longer footrest support, which must withstand a much higher load while the test load on the footrest remains the same. Therefore, a more robust part needs to be developed to withstand the new requirements. The aesthetical design of the new footrest is based various 2D sketches provided by the motorbike manufacturer's design department. From which, the one most suitable for the technical requirements was chosen for further development work. The design work was carried out on the 3D program “Creo 4 Parametric”. After creating the outer shape and therefore the optical appearance of the part, the focus shifted to the stability. An FEA calculation for the footrest holder as well for the foot break and the lever was set up and different versions of those were calculated to reach a final design. An FEM calculation was made to check different versions of the footrest support and gear lever and to prepare them for approval according to European Union Regulation No. 169/2013. The final design not only realizes the optical design requirements, but as well withstands the forces applied on it. The chosen manufacturing process for the footrest support as well as the brake and gear lever is forging from aluminum. The heel guard, on the other hand, is die-cast from plastic. Although attention was paid to a rigid and stable design in the development of the heel guard, there is no direct load on the component, which is why an FEA calculation could be dispensed with. Compared to the previous model, the increase in weight was kept to a minimum by changing the manufacturing process from casting to forging, despite significantly increased loads. In addition, an aesthetic design of the entire footrest system was implemented as desired.
Published: 2023

9. Fundamentals of the vibratory driving of piles and sheet piles.

Author: Massarsch, K. Rainer, Fellenius, Bengt H., and Bodare, Anders
Subjects: *FREQUENCIES of oscillating systems, *EFFECTIVE stress (Soil mechanics), *VIBRATORS, *RESONANCE, *SOIL dynamics
Abstract: Vibratory driving is a common method for installing or extracting piles and sheet piles as well as for deep vibratory compaction. The most important parameters are vibration frequency, vibration amplitude and eccentric moment. These parameters govern vibratory driving and, in particular, the soil resistance at the toe and along the shaft of a pile. Pile driving causes oscillating horizontal ground vibrations in coarse-grained soils. It can be shown that these horizontal vibrations reduce the shaft resistance during driving. The process results in a permanent increase in the horizontal effective stress, which causes arching around the vibrated pile. The increase in horizontal effective stress is also important for deep vibratory compaction. The resonance frequency of the vibrator-pile-soil system significantly affects pile penetration and the emission of ground vibrations. At resonance, the vertical vibration velocity in the soil reaches a maximum and pile penetration becomes very slow, whereas beyond resonance, the vibration velocity decreases and the pile penetration speed is high. Field monitoring of the vibratory driving process can be used to optimize vibratory pile driving, as examples have shown. A new concept is proposed in which the driveability can be determined from a correlation between penetration resistance measurements (blows/depth) and penetration speed. The validity of the concept is demonstrated by a case history and project references. [ABSTRACT FROM AUTHOR]
Published: 2017
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10. Določitev strategije uporabe elektromotorja v hibridni transmisiji za dosego minimalne porabe goriva

Author: Berden, Nejc and Klemenc, Jernej
Subjects: strategije ravnanja z energijo, energy management strategy, diagram BSFC, driving resistance, BSFC diagram, WLTC, hybrid vehicle, elektromotorji, udc:629:621.313.13:531.4(043.2), hibridna vozila, vozni upori, electric motor
Abstract: V diplomskem delu smo na podlagi standardiziranega WLTC-cikla vožnje določili strategijo vklopa elektromotorja. Najprej smo izvedli preračun voznih uporov in določili potrebni moment na kolesih. Ker gre za hibridno transmisijo, je bilo treba določiti, kdaj dobimo potrebni moment iz električnega dela transmisije in kdaj iz motorja z notranjim zgorevanjem. Sprejeta odločitev glede vklopa elektromotorja je bila vezana na pospeške v danem trenutku in gradient momenta na elektromotorju. Na podlagi strategije so bili določeni trije načini vožnje, A, B in C, z različnimi gradienti povečevanja momenta elektromotorja. Na podlagi pedala za plin so bili preračunani potrebni podatki o obratih in na podlagi teh s pomočjo grafa BSFC izračunana trenutna poraba goriva skozi vozni cikel WLTC. S pomočjo analize podatkov o porabi goriva je bila podana primerna rešitev za hibridno transmisijo vozila. In this thesis, an electric motor start-up strategy was defined that is based on the standardised WLTC driving cycle. First, the rolling resistances were calculated and the required wheel torque was determined. As the vehicle has a hybrid transmission, it was necessary to determine when to get the required torque from the electric part of the transmission and when from the internal combustion engine. The decision taken to engage the electric motor was linked to the acceleration at a given moment and the torque gradient on the electric motor. Based on the strategy, three driving modes A, B and C with different gradient levels were determined. The required angular velocity data was calculated based on the accelerator pedal and the instantaneous fuel consumption over the WLTC driving cycle was calculated using the BSFC graph. By comparing the fuel consumption data, a suitable solution for the hybrid transmission of the vehicle was given.
Published: 2022

11. Construction and Experimental Verification of Sloped Terrain Soil Pressure-Sinkage Model

Author: Xiaole Wang, Yang Fuzeng, Liu Zhijie, Pan Guanting, and Sun Jingbin
Subjects: Tractor, business.product_category, driving resistance, Modulus, Terrain, Plant Science, 01 natural sciences, Soil compaction (agriculture), Lateral earth pressure, Geotechnical engineering, lcsh:Agriculture (General), hillside metal-tracked tractor, 010401 analytical chemistry, sloped terrain, 04 agricultural and veterinary sciences, Bulk density, lcsh:S1-972, 0104 chemical sciences, soil sinkage, Soil water, 040103 agronomy & agriculture, 0401 agriculture, forestry, and fisheries, business, Agronomy and Crop Science, Rotation (mathematics), Geology, pressure–sinkage model, Food Science
Abstract: The construction of a scientific and effective soil pressure-sinkage model under sloped terrain condition has important guiding significance for the investigation of the soil compaction effect. It is also important for the theoretical calculation of driving resistance and design optimization of the undercarriage structure of hillside metal-tracked tractors (HMTs). The classic Bekker’s pressure-sinkage model does not consider the influence of the soil water content, bulk density, slope angle, and other factors, therefore, it cannot be directly used to investigate the relationship between the soil compaction and its sinkage under sloped terrain conditions. To solve this problem, this study first verified that the soil water content and bulk density exert significant effects on the pressure–sinkage relationship under flat terrain condition. Secondly, a pressure-sinkage test was carried out using the quadratic rotation orthogonal combination design method, and the soil water content, density, and slope angle were considered. The pressure-sinkage curves of sloped terrain soils from Yangling and Yangxian in Shaanxi Province, and Huining and Jingning in Gansu Province were obtained. Then the pressure–sinkage parameters (sinkage exponent, cohesive modulus, and frictional modulus) were calculated using the weighted least-squares method. Thirdly, the mathematical relationship between the parameters and the soil water content, bulk density, and slope angle was obtained. Then Bekker’s model was modified to obtain the pressure–sinkage model of sloped terrain. Finally, the control variable method under slope angle of 10°, soil water content of 10%, and bulk density of 2 mg·m−3 were used to validate the model. The results revealed that the root-mean-square error between the calculated pressure value of the model and the measured value of the film pressure sensor was 1.614, 1.601, and 0.822, respectively. In the dynamic operation of a hillside tractor prototype, the calculated pressures between the supporting wheels were close to the measured values. It indicates that the modified soil pressure–sinkage model is more suitable for calculating the force at the bottom of the track between the supporting wheels. It can also provide an important theoretical basis for accurately calculating the pressure–sinkage parameters of sloped terrain soil. Additionally, this approach could provide theoretical and technical support for the rational arrangement of HMT undercarriages to reduce the soil sinkage and driving resistance.
Published: 2021

12. Экологические аспекты сопротивления движения автомобиля

Subjects: окружающая среда, fuel consumption, автомобильный транспорт, выбросы, расход топлива, driving resistance, emissions, pollution, automobile transport, environment, сопротивление движению, загрязнение
Abstract: Автомобильный транспорт – крупнейший производитель углекислого газа, который в наибольшей степени влияет на парниковый эффект. Количество потребляемого топлива влияет на окружающую среду, состояние здоровья населения, а также на финансовые затраты, связанные с эксплуатацией транспортных средств. Статья посвящена проблемам сопротивлений движению, влияющих на транспортное средство. Каждый автомобиль ломает сопротивление движению во время езды. Эти сопротивления представляют собой сопротивление воздуха, сопротивление ускорению, сопротивление качению и сопротивление градиенту. Двигатель должен выполнять определенную работу, чтобы сломать сопротивление движению. Увеличение значения некоторых сопротивлений приводит к увеличению работы, необходимой для их разрушения. Для такой работы необходимо израсходовать определенное количество топлива, а результат виден в виде вредных выбросов. В статье описывается механизм формирования особых сопротивлений движению и факторы, влияющие на них., Automobile transport is the greatest generator of carbon dioxide that influences the greenhouse effect to large extent. The quantity of consumed fuel infl uences the ecology, the state of health of people along with the financial expenses that are related to the operation of vehicles. The paper is devoted to the problems of driving resistances that influence an automobile. Each automobile breaks driving resistances in the course of driving. These resistances are air resistance, acceleration resistance, rolling resistance and gradient resistance. The motor should carry out particular work for the purpose of breaking the driving resistances. A rise in the value of some resistances leads to a rise in the work required for its breaking. For such work it is essential to expend specific amount of fuel and the outcome is visible in the shape of detrimental emissions. The paper characterises the mechanism of development of certain driving resistances and factors that influence them., Приборы и системы. Управление, контроль, диагностика, Выпуск 4 2021
Published: 2021
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13. driving resistance

Author: Herrmann, Helmut and Bucksch, Herbert
Published: 2014
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14. Analysis of Driving Dynamics Considering Driving Resistances in On-Road Driving.

Author: Song, Jingeun and Cha, Junepyo
Subjects: INTERNAL combustion engine exhaust gas, EMISSIONS (Air pollution), TRAFFIC safety
Abstract: Internal combustion engine emissions are a serious worldwide problem. To combat this, emission regulations have become stricter with the goal of reducing the proportion of transportation emissions in global air pollution. In addition, the European Commission passed the real driving emissions–light-duty vehicles (RDE-LDV) regulation that evaluates vehicle emissions by driving on real roads. The RDE test is significantly dependent on driving conditions such as traffic or drivers. Thus, the RDE regulation has the means to evaluate driving dynamics such as the vehicle speed per acceleration (v·apos) and the relative positive acceleration (RPA) to determine whether the driving during these tests is normal or abnormal. However, this is not an appropriate way to assess the driving dynamics because the v⋅apos and the RPA do not represent engine load, which is directly related to exhaust emissions. Therefore, in the present study, new driving dynamic variables are proposed. These variables use engine acceleration calculated from wheel force instead of the acceleration calculated from the vehicle speed, so they are proportional to the engine load. In addition, a variable of driving dynamics during braking is calculated using the negative wheel force. This variable can be used to improve the accuracy of the emission assessment by analyzing the braking pattern. [ABSTRACT FROM AUTHOR]
Published: 2021
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15. Construction and Experimental Verification of Sloped Terrain Soil Pressure-Sinkage Model.

Author: Pan, Guanting, Sun, Jingbin, Wang, Xiaole, Yang, Fuzeng, Liu, Zhijie, and Gronauer, Andreas
Subjects: SOIL compaction, SOIL moisture, SOILS, PROBLEM solving, PRESSURE sensors, RELIEF models
Abstract: The construction of a scientific and effective soil pressure-sinkage model under sloped terrain condition has important guiding significance for the investigation of the soil compaction effect. It is also important for the theoretical calculation of driving resistance and design optimization of the undercarriage structure of hillside metal-tracked tractors (HMTs). The classic Bekker's pressure-sinkage model does not consider the influence of the soil water content, bulk density, slope angle, and other factors; therefore, it cannot be directly used to investigate the relationship between the soil compaction and its sinkage under sloped terrain conditions. To solve this problem, this study first verified that the soil water content and bulk density exert significant effects on the pressure–sinkage relationship under flat terrain condition. Secondly, a pressure-sinkage test was carried out using the quadratic rotation orthogonal combination design method, and the soil water content, density, and slope angle were considered. The pressure-sinkage curves of sloped terrain soils from Yangling and Yangxian in Shaanxi Province, and Huining and Jingning in Gansu Province were obtained. Then the pressure–sinkage parameters (sinkage exponent, cohesive modulus, and frictional modulus) were calculated using the weighted least-squares method. Thirdly, the mathematical relationship between the parameters and the soil water content, bulk density, and slope angle was obtained. Then Bekker's model was modified to obtain the pressure–sinkage model of sloped terrain. Finally, the control variable method under slope angle of 10°, soil water content of 10%, and bulk density of 2 mg·m−3 were used to validate the model. The results revealed that the root-mean-square error between the calculated pressure value of the model and the measured value of the film pressure sensor was 1.614, 1.601, and 0.822, respectively. In the dynamic operation of a hillside tractor prototype, the calculated pressures between the supporting wheels were close to the measured values. It indicates that the modified soil pressure–sinkage model is more suitable for calculating the force at the bottom of the track between the supporting wheels. It can also provide an important theoretical basis for accurately calculating the pressure–sinkage parameters of sloped terrain soil. Additionally, this approach could provide theoretical and technical support for the rational arrangement of HMT undercarriages to reduce the soil sinkage and driving resistance. [ABSTRACT FROM AUTHOR]
Published: 2021
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16. The Possibilities Of Reducing The Fuel Consumption By Covering The Loading Capacity Of Tipping Semi-Trailer Designed To Carry Bulk Materials

Author: Vladimír Rievaj, Tomasz Figlus, František Synák, and Monika Kiktová
Subjects: education.field_of_study, Driving test, Waste management, business.industry, 020209 energy, Fossil fuel, Population, 02 engineering and technology, Semi-trailer, Air Resistance, Carbon Dioxide, Driving Resistance, Fuel Consumption, Global Pollution, Tipping Semi-Trailer, Carry (investment), 0202 electrical engineering, electronic engineering, information engineering, Fuel efficiency, Production (economics), Environmental science, business, education
Abstract: The amount of fossil fuels consumed has direct impact on global pollution and health status of the human population. An increasing amount of fuel consumed leads to the increase using of non-renewable resources of energy. This article deals with possibilities of reducing the fuel consumption by covering the loading capacity of tipping semi-trailer. The introduction of this paper describes the impact the amount of fuel consumed on production of carbon dioxide. The ratio of driving resistances to fuel consumption is shown in the graph. In the second part of the article there is the methodology of the measurements. The measurements were conducted by driving test. The fuel consumption of tipping semi-trailer was measured during the driving with uncovered and covered loading capacity. The importance of this paper lies in the quantified the possibilities of reducing the fuel consumption by covering the loading capacity of tipping semi-trailer designed to carry bulk materials.
Published: 2018
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17. Preinaka osobnog vozila Peugeot 1007 u električno vozilo

Author: Podgajski, Marko and Lulić, Zoran
Subjects: hibridna vozila, električni pogon, otpori vožnje, vučna sila, TEHNIČKE ZNANOSTI. Strojarstvo, electric drivetrain, driving resistance, hybrid vehicles, tractive force, TECHNICAL SCIENCES. Mechanical Engineering
Abstract: U ovom radu razmatra se mogućnost ugradnje dodatnog, električnog pogona u osobno vozilo Peugeot 1007 1.4 HDI gdje bi se Dieselovom motoru koji pogoni prednju osovinu dodao električni pogon koji bi pokretao stražnju osovinu. Opisani su tehnički podaci vozila te je izračunata vučna sila motora s unutarnjim izgaranjem kako bi se odredilo referentno stanje vozila. Isto tako izračunate su energetske potrebe vozila. Predložene su različite mogućnosti ugradnje električnog pogona. Odabran je elektromotor te izračunata vučna sila elektromotora. Prikazana je usporedba vučnih sila motora s unutarnjim izgaranjem i elektromotora. Na kraju je izrađena tehnička dokumentacija pojedinih dijelova električnog pogona.
Published: 2015

18. Ermittlung und Bewertung der Abbildungsg��te von Realfahrteinfl��ssen zur Darstellung von Real-Driving-Emissions-Messungen auf Rollenpr��fst��nden

Author: Szikora, Marcus
Subjects: fuel consumption, Emissionen, Kraftstoffverbrauch, driving resistance, real-driving-emissions testing, Fahrwiderstand, emissions, energetische Verbraucher, light duty vehicle, Personenkraftfahrzeug, Real-Driving-Emissions, energetic consumption
Abstract: Zurzeit wird auf EU-Ebene ein neues Emissionstestverfahren entwickelt, welches unter der Bezeichnung Real-Driving-Emissions (kurz RDE) bekannt ist. Im Vergleich zur bisherigen Testprozedur, ist diese wesentlich realit��tsn��her, da die Tests auf ��ffentlichen Stra��en und in "realer Umgebung" durchzuf��hren sind. F��r die Fahrzeugentwicklung folgt daraus die Herausforderung, sich ver��ndernder und damit schwer reproduzierbarer Testbedingungen. Abhilfe soll die Versuchsdurchf��hrung auf Rollenpr��fst��nden bringen. Diese m��ssen dazu aufger��stet werden, um die relevanten Umgebungseinfl��sse abbilden zu k��nnen, wobei hinsichtlich Emissionen und Kraftstoffverbrauch, gut vergleichbare Ergebnisse erreicht werden m��ssen. Dazu werden in dieser Arbeit zun��chst die grunds��tzlichen Einfl��sse auf ein Fahrzeug bei Fahrten in "realer Umgebung" identifiziert. Basierend darauf, k��nnen die physikalischen Einflussgr��en auf Emissionen und Kraftstoffverbrauch ermittelt werden. Nach Identifikation der physikalischen Einflussgr��en, erfolgt deren qualitative und quantitative Bewertung, bez��glich der Auswirkungen auf Emissionen und Kraftstoffverbrauch. Der Fokus der Arbeit liegt auf der Bewertung jener Einflussgr��en, welche sich direkt auf den Fahrwiderstand des Fahrzeugs und die energetischen Verbraucher auswirken. Die Quantifizierung der physikalischen Einflussgr��en erfolgt mit Hilfe einer Literaturrecherche, der Berechnung von Fahrwiderstands��nderungen und einem Simulationsmodell. Es zeigt sich, dass die Einflussgr��en Schaltzeitpunkt und -dauer, Sonnenschein, Niederschlag, resultierende Anstr��mung, Kurvigkeit, Fahrbahnneigung, Ebenheit der Fahrbahn, Textur der Fahrbahnoberfl��che und der Reifeninnendruck aufgrund ihrer Auswirkungen auf Emissionen und Kraftstoffverbrauch als wesentlich zu bewerten sind. Die Einflussgr��en plastische Verformbarkeit der Fahrbahn sowie geringf��gige ��nderungen der Fahrzeugmasse konnten aufgrund der geringen Auswirkungen als vernachl��ssigbar bewertet werden., Recent developments in the EU introduce a new emissions testing procedure called real-driving-emissions (RDE). The tests are taking place on public roads and within "real" surroundings, to deliver more realistic results. These changes are causing some challenges due to the hardly reproducible test conditions. A solution can be found by using an improved chassis dynamometer, which replicates the environmental influences in a realistic way. Especially emissions and fuel consumption must be well reproducible. To specify the conditions in more detail, this thesis at first discusses the fundamental influences on vehicles within "real" surroundings. Based on that, the next step is the evaluation of the physical quantities crucial for emissions and fuel consumption. These quantities can then be estimated qualitatively and quantitatively due to their effects on emissions and fuel consumption. The main focus of this thesis are those quantities directly influencing the driving resistance of the vehicle as well as the energetic consumption. The quantification relies on literature research, calculating changes of the driving resistance and simulation models. As the results show, the substantial impacts on emissions and fuel consumption result from the following physical quantities: gear shifting point and switching time, solar radiation, rain, resulting wind speed, road curvature, road slope, road evenness, road surface texture and tire inflation pressure. The physical quantities of pavement deflection and marginal changes in vehicle mass can be neglected due to their minor impact.
Published: 2015
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19. Soil Plugging of Open-Ended Piles During Impact Driving in Cohesion-less Soil

Author: Karlowskis, Victor and Karlowskis, Victor
Abstract: During impact driving of open-ended piles through cohesion-less soil the internal soil column may mobilize enough internal shaft resistance to prevent new soil from entering the pile. This phenomena, referred to as soil plugging, changes the driving characteristics of the open-ended pile to that of a closed-ended, full displacement pile. If the plugging behavior is not correctly understood, the result is often that unnecessarily powerful and costly hammers are used because of high predicted driving resistance or that the pile plugs unexpectedly such that the hammer cannot achieve further penetration. Today the user is generally required to model the pile response on the basis of a plugged or unplugged pile, indicating a need to be able to evaluate soil plugging prior to performing the drivability analysis and before using the results as basis for decision. This MSc. thesis focuses on soil plugging during impact driving of open-ended piles in cohesion-less soil and aims to contribute to the understanding of this area by evaluating models for predicting soil plugging and driving resistance of open-ended piles. Evaluation was done on the basis of known soil plugging mechanisms and practical aspects of pile driving. Two recently published models, one for predicting the likelihood of plugging and the other for predicting the driving resistance of open-ended piles, were compared to existing models. The main outcomes from the model evaluations are: • Internal shaft resistance, pile diameter and pile velocity/acceleration were found to be the primary input parameters affecting the result in the models used to predict if soil plugging is likely to occur. • The pile diameter was shown to have less influence on the calculated driving resistance in the recently published model, derived from measurements of plug length ratios, compared to in the existing model. This thesis also includes a full-scale field study conducted during the initial piling operations for the construction, Under slagdrivning av öppna pålar i friktionsjord förekommer det att den interna jordpelaren mobiliserar tillräckligt mycket internt mantelmotstånd för att förhindra inträngning av ny jord. Detta fenomen, på svenska vanligen kallat jordpluggning, medför att drivbeteendet för pålen övergår till att likna det hos en sluten och massundanträngande påle. Oförmåga att på ett korrekt sätt beakta jordpluggning medför ofta att drivmotståndet för öppna pålar antingen överskattas, vilket medför att onödigt kraftfull och kostsam utrustning används, eller underskattas vilket kan medföra att pålen pluggar och inte kan drivas till avsett djup. I dagsläget kräver drivbarhetsanalyser generellt sett att användaren måste modellera pålen som en pluggad eller opluggad påle. Detta medför att det finns ett behov att kunna utvärderajordpluggning innan drivbarhetsanalysen genomförs, samt även vid utvärdering av resultaten från drivbarhetsanalysen. Detta examensarbete fokuserar på jordpluggning vid slagdrivning av öppna pålar i friktionsjord och syftar till att öka kunskapen inom området genom att utvärdera modeller som kan användas för att uppskatta huruvida jordpluggning är sannolikt, samt modeller för att uppskatta drivmotståndet för öppna pålar. Utvärderingen av nämnda modeller skedde med utgångspunkt i kända mekanismer som förknippas med jordpluggning, samt i praktiska aspekter av påldrivning. Två nyligen publicerade modeller, en avsedd att utvärdera huruvida pluggning är sannolikt och den andra för att uppskatta det förväntade drivmotståndet, jämfördes med befintliga modeller för samma ändamål. De huvudsakliga slutsatserna av modellutvärderingen är: • Internt mantelmotstånd, pålens diameter samt pålens hastighet/acceleration var de faktorer som hade störst inverkan på resultatet hos de modeller som avser utvärdera huruvida jordpluggning är att förvänta. • Pålens diameter visade sig få mindre inverkan på beräknat drivmotstånd i den nyligen publicerade modellen, baserad på mätningar av p
Published: 2014

20. Návrh pohonu vozidla pro Shell Eco-marathon

Author: Pokorný, Jan, Tomek, Petr, Drábek, Ondřej, Pokorný, Jan, Tomek, Petr, and Drábek, Ondřej
Abstract: V této diplomové práci se řeší návrh pohonu vozidla určeného pro soutěž o nejnižší spotřebu paliva pořádanou společností Shell s označením Eco-marathon. V první řadě je zapotřebí určit jízdní odpory, z nichž se vypočítá potřebný výkon motoru a přiřadí se k němu odpovídající motor. Motor se upraví dle pravidel závodu a vloží se do rámu vozidla ve vlastní konstrukci. Pohon je řešen pomocí planetového převodu s řetězovým převodem. Nakonec se práce zabývá úspornými možnostmi pohonu a výpočtem spotřeby paliva., This thesis is focused on a proposal of the car propulsion for the Eco-marathon competition which is organized by the company Shell. The competition is concentrated on the best results of the lowest fuel consumption. Firstly, it is necessary to determine driving resistance. On the basis of the resistance the engine power is going to be calculated and the appropriate engine is going to be assigned to it. The engine will be modified according to the rules of the competition and it will be embedded into the vehicle frame in its own construction. The propulsion is going to solved by means of epicyclic gear with a gearing chain. At the end of this thesis I plan to study the fuel saving possibilities of the engine and I will also calculate its fuel consumption., Katedra dopravních prostředků a diagnostiky, Při obhajobě diplomant komisi seznámil s diplomovou prací, ve které řešil návrh pohonu vozidla pro Shell Eco-mathon. Rozsah, zpracování a vlastní prezentace práce svědčí o náročnsti daneho probému. Na otázky oponenta diplomová práce, vedoucího diplomové práce i členů komise při rozpravě odpovídal věcně správně.
Published: 2013

21. Využití fotovoltaických článků k přímému napájení železničních vozidel

Author: Doleček, Radovan, Šimánek, Jiří, Tichý, Jaroslav, Doleček, Radovan, Šimánek, Jiří, and Tichý, Jaroslav
Abstract: Práce se zabývá problematikou návrhu železničního vozidla přímo napájeného fotovoltaickými panely. V práci je obsažen popis základních vlastností slunečního záření a fotovoltaických panelů, včetně přehledu vybraných technologií výroby fotovoltaických panelů. Hlavním výstupem práce je projekční studie vozidla s přímým solárním zdrojem elektrické energie. Vozidlo je poháněno synchronním motorem s permanentními magnety., This thesis deals with problems of railway vehicle with directly powered by photovoltaic panels. The work included a description of the basic properties of solar radiation and solar modules including an overview of selected technologies for the production of photovoltaic panels. The main output of this work is a design study of a vehicle with a direct solar power supply of electrical power. The vehicle is driven by synchronous motor with permanent magnets., Katedra elektrotechniky, elektroniky a zabezpečovací techniky v dopravě, Uchazeč prezentoval komisi hlavní výsledky a závěry své diplomové práce. Po prezentaci diplomové práce zodpověděl dotazy vedoucího a oponenta diplomové práce. V diskusi o diplomové práci podrobně zodpověděl všechny dotazy členů komise., Dokončená práce s úspěšnou obhajobou
Published: 2011

22. Metody snižování spotřeby moderních vozidel

Author: Štětina, Josef, Pech, Ondřej, Kubeš, Filip, Štětina, Josef, Pech, Ondřej, and Kubeš, Filip
Abstract: V tejto práci sú zhrnuté základné poznatky z termomechaniky spaľovacích motorov, pričom dôraz bol kladený na účinnosť spaľovacích motorov, tepelné obehy a ich popis pomocou teoretických a indikátorových diagramov. Je uvedená klasifikácia účinností a ich jednotlivé definície. V ďalšej časti sa práca zameriava na niektoré systémy používané v moderných vozidlách, ktoré zvyšujú účinnosť spaľovacích motorov a znižujú spotrebu paliva. Taktiež sa venuje koncepčným riešeniam, ktoré sú pripravované do sériovej výroby. Posledná časť práce sa sústreďuje na techniku úspornej jazdy a znižovanie jazdných odporov. Záver práce poukazuje na smer, ktorým sa bude vývoj automobilov uberať., This thesis summarizes the basic knowledge of thermodynamics of internal combustion engines. Emphasis was put on engine efficiency and engine cycles, described by theoretical and indicator diagrams. It also introduces classification of engine efficiencies, and their respective definitions. The next section focuses on some systems used in modern vehicles, that improves engine efficiency and reduces fuel consumption. Moreover it includes conceptual solutions, that are in preparation for mass production. The last part of this thesis concentrates on economical driving techniques, and reduction of driving resistance. In conclusion, the thesis shows the direction of next development of automobiles.

23. Koeficient valivého odporu pneumatik

Author: Hejtmánek, Petr, Blaťák, Ondřej, Hasala, Matěj, Hejtmánek, Petr, Blaťák, Ondřej, and Hasala, Matěj
Abstract: Tato bakalářská práce se zaměřuje na koeficient valivého odporu pneumatik jak z pohledu faktorů, které tento koeficient ovlivňují, tak z pohledu experimentálních metod pro jeho stanovení. V první části práce jsou detailně rozebrány klíčové faktory ovlivňující koeficient valivého odporu. Následuje popis metod používaných k měření valivého odporu v laboratorních a reálných podmínkách. Práce pokračuje přehledem typických hodnot koeficientu valivého odporu pneumatik různých kategorií, které byly ještě rozděleny do podkategorií a vzájemně porovnávány. Poslední část práce se věnuje principiálnímu návrhu měřicího zařízení pro měření valivého odporu. Návrh zohledňuje cenové náklady a možnost získání osvědčení o technické způsobilosti k provozu vozidla na pozemních komunikacích. V návrhu měřicího zařízení byly vybrány konkrétní měřící přístroje a komponenty potřebné pro homologační proces a byla vytvořena cenová kalkulace známých dílů., This bachelor thesis focuses on the rolling resistance coefficient of tyres both in terms of the factors that influence this coefficient and in terms of experimental methods for its determination. In the first part of the thesis, the key factors affecting the rolling resistance coefficient are discussed in detail. This is followed by a description of the methods used to measure rolling resistance in laboratory and real-world conditions. The thesis continues with an overview of typical rolling resistance coefficient values for tyres of different categories, which have been further divided into subcategories and compared with each other. The last part of the thesis is devoted to the principal design of a measuring device for rolling resistance measurement. The design takes the cost and capability of obtaining a certificate of roadworthiness into account. Specific measuring instruments and components needed for the homologation process were selected and price calculation of known parts was made.

24. Koncepční návrh dvoutoké převodovky

Author: Řehák, Kamil, Prokop, Aleš, Kliš, Vojtěch, Řehák, Kamil, Prokop, Aleš, and Kliš, Vojtěch
Abstract: Tato práce se zabývá koncepčním návrhem dvoutoké převodovky a následnou kontrolou vybraných navržených částí této převodovky. První část práce je věnována teorii řadicích ústrojí v automobilech a následnému rozboru již dostupných dvoutokých převodovek. Dále se práce zaměřuje již na samotný koncepční návrh, který vychází ze zvoleného vozidla, na kterém bude převodovka umístěna a jeho jízdních odporech. Na základě těchto výchozích hodnot je zvoleno odstupňování převodovky, které má vliv na jízdní dynamiku vozidla. S ohledem na zástavbový prostor je pak navrženo koncepční uspořádání převodovky. Dále se práce zabývá základním konstrukčním návrhem a výpočty jednotlivých funkčních částí převodového ústrojí. Poslední část práce je věnována kontrole vybraných konstrukčních uzlů pomocí metody konečných prvků provedených v softwaru Ansys Workbench. Celá práce tak popisuje jednotlivé kroky pro návrh základní koncepce dvoutoké převodovky a konstrukci jejich základních komponent., This thesis deals with the conceptual design of a double clutch gearbox and the inspection of selected designed parts of this gearbox. The first part of the thesis is focused on the theory of automotive transmissions and analysis of already available double clutch gearboxes. The following is the conceptual design itself, which is based on the selected vehicle on which the transmission will be located and on driving resistances. Based on these default values, the gear graduation is selected, which affects the vehicle’s driving dynamics. With regard to the installation space, a conceptual arrangement of the gearbox is proposed. Furthermore, the thesis is focused on the basic design and calculations of individual functional components of the gearbox. The last part of the thesis is involved to the control of selected structural nodes using the finite element method in the ansys workbench software. The whole thesis describes the individual steps for the design of the basic concept of a double clutch gearbox and the design of their basic components.

25. Návrh pohonu prototypu pro Shell Eco-marathon

Author: Štětina, Josef, Klimeš, Lubomír, Skácelík, Radek, Štětina, Josef, Klimeš, Lubomír, and Skácelík, Radek
Abstract: V bakalářské práci je řešeno pohonné ústrojí soutěžního vozu. V úvodu jsou shrnuta pravidla soutěže. Dále jsou řešeny jízdní odpory a varianty pohonného ústrojí vozidla, jehož hlavním cílem je dosáhnout nízké spotřeby. Řešení je zaměřeno na koncept řazení rychlostí v planetovém náboji v kombinaci s užitím synchronního řemenového převodu. V konstrukci je k pohonu použit motor Honda GX25 s odstředivou spojkou a rozměr hnaného kola je 20". Řešení je znázorněno ve výkresu sestavení., In the bachelor thesis, the drivetrain design of the racing car is solved and described. The competition rules are summarized in the introduction. Then the driving resistances and drivetrain design variants are evaluated, which main objective is to achieve low fuel consumption. The solution is focused on the concept of a planetary gear-shifting hub, in combination with the synchronous belt drive. The Honda GX25 engine with a centrifugal clutch and the driven wheel dimension of 20” is used to drive the design. The design solution is shown at the assembly drawing.

26. Autonomní trakční vozidlo typu AGV

Author: Kašpárek, Jaroslav, Urbánek, Michal, Brauner, Jiří, Kašpárek, Jaroslav, Urbánek, Michal, and Brauner, Jiří
Abstract: Práce se zabývá konstrukčním návrhem autonomního trakčního vozidla typu AGV, sloužícího k zajištění materiálového toku. První část práce obsahuje rešerši autonomních vozíků s uvedením obdobných konceptů vyskytujících se na trhu. Druhá část obsahuje samotný návrh prototypu vozíku, což je výběr komponent, a to naváděcích a bezpečnostních, a návrh trakčního pohonu a trakčního akumulátoru. Na závěr je proveden návrh rámu se silovým výpočtem vybraného uzlu., The thesis deals with the design of an autonomous traction vehicle of a type AGV, used to purvey material flow. The first part of the thesis contains a research on the autonomous trucks with similar concepts offered on the market. The second part contains the description of the design of the prototype truck. It includes the selection of the guiding and safety components as well as the design of the traction drive and the traction battery. Finally, a frame design with force calculation of the selected node is performed.

27. Metody snižování spotřeby moderních vozidel

Author: Štětina, Josef, Pech, Ondřej, Kubeš, Filip, Štětina, Josef, Pech, Ondřej, and Kubeš, Filip
Abstract: V tejto práci sú zhrnuté základné poznatky z termomechaniky spaľovacích motorov, pričom dôraz bol kladený na účinnosť spaľovacích motorov, tepelné obehy a ich popis pomocou teoretických a indikátorových diagramov. Je uvedená klasifikácia účinností a ich jednotlivé definície. V ďalšej časti sa práca zameriava na niektoré systémy používané v moderných vozidlách, ktoré zvyšujú účinnosť spaľovacích motorov a znižujú spotrebu paliva. Taktiež sa venuje koncepčným riešeniam, ktoré sú pripravované do sériovej výroby. Posledná časť práce sa sústreďuje na techniku úspornej jazdy a znižovanie jazdných odporov. Záver práce poukazuje na smer, ktorým sa bude vývoj automobilov uberať., This thesis summarizes the basic knowledge of thermodynamics of internal combustion engines. Emphasis was put on engine efficiency and engine cycles, described by theoretical and indicator diagrams. It also introduces classification of engine efficiencies, and their respective definitions. The next section focuses on some systems used in modern vehicles, that improves engine efficiency and reduces fuel consumption. Moreover it includes conceptual solutions, that are in preparation for mass production. The last part of this thesis concentrates on economical driving techniques, and reduction of driving resistance. In conclusion, the thesis shows the direction of next development of automobiles.

28. Měření výkonu spalovacích motorů na válcovém dynamometru

Author: Štětina, Josef, Ramík, Pavel, Adamec, Vojtěch, Štětina, Josef, Ramík, Pavel, and Adamec, Vojtěch
Abstract: Tato bakalářská práce zpracovává téma měření výkonu a krouticího momentu spalovacího motoru na válcovém dynamometru. Cílem práce bylo na základě provedené rešerše poukázat na výhody a nevýhody jednotlivých typů dynamometrů, zpracovat přehled norem pro měření výkonu na válcovém dynamometru, vliv atmosférických podmínek, odporů a skluzů. Práce také popisuje, vývoj, různá konstrukční řešení válcového dynamometru, vlivu velikosti válců na valivý odpor a deformaci pneumatiky, vhodné dynamometry pro válcovou zkušebnu, vybavení zkušebny, zatěžovací módy a rozdíly mezi statickou a dynamickou zkouškou. Závěrem je provedena predikce budoucího vývoje těchto zařízení s ohledem na dokonalejší podvozkové systémy vozidel a vývoj elektromobilů., This bachelor thesis deals with topic measuring the power and the torque of internal combustion engines on chassis dynamometer. The aim of the thesis was to show advantages and disadvantages of different types of dynamometers, to make review of standards for measuring power on chassis dynamometer, effect of atmospheric conditions, resistances and slippage. Thesis also describes evolution, different designs of chassis dynamometers, effect of roller diameter to rolling resistance and deformation of tire, suitable types of dynamometers for chassis dynamometer, equipment of testing room, modes of operating and differences between static and dynamic power testing. In the end I have made prediction of incoming development devices of this type with regard to evolution of intelligent chassis control systems and electric vehicles.

29. Měření výkonu spalovacích motorů na válcovém dynamometru

Author: Štětina, Josef, Ramík, Pavel, Adamec, Vojtěch, Štětina, Josef, Ramík, Pavel, and Adamec, Vojtěch
Abstract: Tato bakalářská práce zpracovává téma měření výkonu a krouticího momentu spalovacího motoru na válcovém dynamometru. Cílem práce bylo na základě provedené rešerše poukázat na výhody a nevýhody jednotlivých typů dynamometrů, zpracovat přehled norem pro měření výkonu na válcovém dynamometru, vliv atmosférických podmínek, odporů a skluzů. Práce také popisuje, vývoj, různá konstrukční řešení válcového dynamometru, vlivu velikosti válců na valivý odpor a deformaci pneumatiky, vhodné dynamometry pro válcovou zkušebnu, vybavení zkušebny, zatěžovací módy a rozdíly mezi statickou a dynamickou zkouškou. Závěrem je provedena predikce budoucího vývoje těchto zařízení s ohledem na dokonalejší podvozkové systémy vozidel a vývoj elektromobilů., This bachelor thesis deals with topic measuring the power and the torque of internal combustion engines on chassis dynamometer. The aim of the thesis was to show advantages and disadvantages of different types of dynamometers, to make review of standards for measuring power on chassis dynamometer, effect of atmospheric conditions, resistances and slippage. Thesis also describes evolution, different designs of chassis dynamometers, effect of roller diameter to rolling resistance and deformation of tire, suitable types of dynamometers for chassis dynamometer, equipment of testing room, modes of operating and differences between static and dynamic power testing. In the end I have made prediction of incoming development devices of this type with regard to evolution of intelligent chassis control systems and electric vehicles.

30. Koncepční návrh dvoutoké převodovky

Author: Řehák, Kamil, Prokop, Aleš, Kliš, Vojtěch, Řehák, Kamil, Prokop, Aleš, and Kliš, Vojtěch
Abstract: Tato práce se zabývá koncepčním návrhem dvoutoké převodovky a následnou kontrolou vybraných navržených částí této převodovky. První část práce je věnována teorii řadicích ústrojí v automobilech a následnému rozboru již dostupných dvoutokých převodovek. Dále se práce zaměřuje již na samotný koncepční návrh, který vychází ze zvoleného vozidla, na kterém bude převodovka umístěna a jeho jízdních odporech. Na základě těchto výchozích hodnot je zvoleno odstupňování převodovky, které má vliv na jízdní dynamiku vozidla. S ohledem na zástavbový prostor je pak navrženo koncepční uspořádání převodovky. Dále se práce zabývá základním konstrukčním návrhem a výpočty jednotlivých funkčních částí převodového ústrojí. Poslední část práce je věnována kontrole vybraných konstrukčních uzlů pomocí metody konečných prvků provedených v softwaru Ansys Workbench. Celá práce tak popisuje jednotlivé kroky pro návrh základní koncepce dvoutoké převodovky a konstrukci jejich základních komponent., This thesis deals with the conceptual design of a double clutch gearbox and the inspection of selected designed parts of this gearbox. The first part of the thesis is focused on the theory of automotive transmissions and analysis of already available double clutch gearboxes. The following is the conceptual design itself, which is based on the selected vehicle on which the transmission will be located and on driving resistances. Based on these default values, the gear graduation is selected, which affects the vehicle’s driving dynamics. With regard to the installation space, a conceptual arrangement of the gearbox is proposed. Furthermore, the thesis is focused on the basic design and calculations of individual functional components of the gearbox. The last part of the thesis is involved to the control of selected structural nodes using the finite element method in the ansys workbench software. The whole thesis describes the individual steps for the design of the basic concept of a double clutch gearbox and the design of their basic components.

31. Návrh pohonu prototypu pro Shell Eco-marathon

Author: Štětina, Josef, Klimeš, Lubomír, Skácelík, Radek, Štětina, Josef, Klimeš, Lubomír, and Skácelík, Radek
Abstract: V bakalářské práci je řešeno pohonné ústrojí soutěžního vozu. V úvodu jsou shrnuta pravidla soutěže. Dále jsou řešeny jízdní odpory a varianty pohonného ústrojí vozidla, jehož hlavním cílem je dosáhnout nízké spotřeby. Řešení je zaměřeno na koncept řazení rychlostí v planetovém náboji v kombinaci s užitím synchronního řemenového převodu. V konstrukci je k pohonu použit motor Honda GX25 s odstředivou spojkou a rozměr hnaného kola je 20". Řešení je znázorněno ve výkresu sestavení., In the bachelor thesis, the drivetrain design of the racing car is solved and described. The competition rules are summarized in the introduction. Then the driving resistances and drivetrain design variants are evaluated, which main objective is to achieve low fuel consumption. The solution is focused on the concept of a planetary gear-shifting hub, in combination with the synchronous belt drive. The Honda GX25 engine with a centrifugal clutch and the driven wheel dimension of 20” is used to drive the design. The design solution is shown at the assembly drawing.

32. Koeficient valivého odporu pneumatik

Author: Hejtmánek, Petr, Blaťák, Ondřej, Hasala, Matěj, Hejtmánek, Petr, Blaťák, Ondřej, and Hasala, Matěj
Abstract: Tato bakalářská práce se zaměřuje na koeficient valivého odporu pneumatik jak z pohledu faktorů, které tento koeficient ovlivňují, tak z pohledu experimentálních metod pro jeho stanovení. V první části práce jsou detailně rozebrány klíčové faktory ovlivňující koeficient valivého odporu. Následuje popis metod používaných k měření valivého odporu v laboratorních a reálných podmínkách. Práce pokračuje přehledem typických hodnot koeficientu valivého odporu pneumatik různých kategorií, které byly ještě rozděleny do podkategorií a vzájemně porovnávány. Poslední část práce se věnuje principiálnímu návrhu měřicího zařízení pro měření valivého odporu. Návrh zohledňuje cenové náklady a možnost získání osvědčení o technické způsobilosti k provozu vozidla na pozemních komunikacích. V návrhu měřicího zařízení byly vybrány konkrétní měřící přístroje a komponenty potřebné pro homologační proces a byla vytvořena cenová kalkulace známých dílů., This bachelor thesis focuses on the rolling resistance coefficient of tyres both in terms of the factors that influence this coefficient and in terms of experimental methods for its determination. In the first part of the thesis, the key factors affecting the rolling resistance coefficient are discussed in detail. This is followed by a description of the methods used to measure rolling resistance in laboratory and real-world conditions. The thesis continues with an overview of typical rolling resistance coefficient values for tyres of different categories, which have been further divided into subcategories and compared with each other. The last part of the thesis is devoted to the principal design of a measuring device for rolling resistance measurement. The design takes the cost and capability of obtaining a certificate of roadworthiness into account. Specific measuring instruments and components needed for the homologation process were selected and price calculation of known parts was made.

33. Návrh pohonu prototypu pro Shell Eco-marathon

Author: Štětina, Josef, Klimeš, Lubomír, Štětina, Josef, and Klimeš, Lubomír
Abstract: V bakalářské práci je řešeno pohonné ústrojí soutěžního vozu. V úvodu jsou shrnuta pravidla soutěže. Dále jsou řešeny jízdní odpory a varianty pohonného ústrojí vozidla, jehož hlavním cílem je dosáhnout nízké spotřeby. Řešení je zaměřeno na koncept řazení rychlostí v planetovém náboji v kombinaci s užitím synchronního řemenového převodu. V konstrukci je k pohonu použit motor Honda GX25 s odstředivou spojkou a rozměr hnaného kola je 20". Řešení je znázorněno ve výkresu sestavení., In the bachelor thesis, the drivetrain design of the racing car is solved and described. The competition rules are summarized in the introduction. Then the driving resistances and drivetrain design variants are evaluated, which main objective is to achieve low fuel consumption. The solution is focused on the concept of a planetary gear-shifting hub, in combination with the synchronous belt drive. The Honda GX25 engine with a centrifugal clutch and the driven wheel dimension of 20” is used to drive the design. The design solution is shown at the assembly drawing.

34. Autonomní trakční vozidlo typu AGV

Author: Kašpárek, Jaroslav, Urbánek, Michal, Kašpárek, Jaroslav, and Urbánek, Michal
Abstract: Práce se zabývá konstrukčním návrhem autonomního trakčního vozidla typu AGV, sloužícího k zajištění materiálového toku. První část práce obsahuje rešerši autonomních vozíků s uvedením obdobných konceptů vyskytujících se na trhu. Druhá část obsahuje samotný návrh prototypu vozíku, což je výběr komponent, a to naváděcích a bezpečnostních, a návrh trakčního pohonu a trakčního akumulátoru. Na závěr je proveden návrh rámu se silovým výpočtem vybraného uzlu., The thesis deals with the design of an autonomous traction vehicle of a type AGV, used to purvey material flow. The first part of the thesis contains a research on the autonomous trucks with similar concepts offered on the market. The second part contains the description of the design of the prototype truck. It includes the selection of the guiding and safety components as well as the design of the traction drive and the traction battery. Finally, a frame design with force calculation of the selected node is performed.

35. Autonomní trakční vozidlo typu AGV

Author: Kašpárek, Jaroslav, Urbánek, Michal, Kašpárek, Jaroslav, and Urbánek, Michal
Abstract: Práce se zabývá konstrukčním návrhem autonomního trakčního vozidla typu AGV, sloužícího k zajištění materiálového toku. První část práce obsahuje rešerši autonomních vozíků s uvedením obdobných konceptů vyskytujících se na trhu. Druhá část obsahuje samotný návrh prototypu vozíku, což je výběr komponent, a to naváděcích a bezpečnostních, a návrh trakčního pohonu a trakčního akumulátoru. Na závěr je proveden návrh rámu se silovým výpočtem vybraného uzlu., The thesis deals with the design of an autonomous traction vehicle of a type AGV, used to purvey material flow. The first part of the thesis contains a research on the autonomous trucks with similar concepts offered on the market. The second part contains the description of the design of the prototype truck. It includes the selection of the guiding and safety components as well as the design of the traction drive and the traction battery. Finally, a frame design with force calculation of the selected node is performed.

36. Měření výkonu spalovacích motorů na válcovém dynamometru

Author: Štětina, Josef, Ramík, Pavel, Štětina, Josef, and Ramík, Pavel
Abstract: Tato bakalářská práce zpracovává téma měření výkonu a krouticího momentu spalovacího motoru na válcovém dynamometru. Cílem práce bylo na základě provedené rešerše poukázat na výhody a nevýhody jednotlivých typů dynamometrů, zpracovat přehled norem pro měření výkonu na válcovém dynamometru, vliv atmosférických podmínek, odporů a skluzů. Práce také popisuje, vývoj, různá konstrukční řešení válcového dynamometru, vlivu velikosti válců na valivý odpor a deformaci pneumatiky, vhodné dynamometry pro válcovou zkušebnu, vybavení zkušebny, zatěžovací módy a rozdíly mezi statickou a dynamickou zkouškou. Závěrem je provedena predikce budoucího vývoje těchto zařízení s ohledem na dokonalejší podvozkové systémy vozidel a vývoj elektromobilů., This bachelor thesis deals with topic measuring the power and the torque of internal combustion engines on chassis dynamometer. The aim of the thesis was to show advantages and disadvantages of different types of dynamometers, to make review of standards for measuring power on chassis dynamometer, effect of atmospheric conditions, resistances and slippage. Thesis also describes evolution, different designs of chassis dynamometers, effect of roller diameter to rolling resistance and deformation of tire, suitable types of dynamometers for chassis dynamometer, equipment of testing room, modes of operating and differences between static and dynamic power testing. In the end I have made prediction of incoming development devices of this type with regard to evolution of intelligent chassis control systems and electric vehicles.

37. Měření výkonu spalovacích motorů na válcovém dynamometru

Author: Štětina, Josef, Ramík, Pavel, Štětina, Josef, and Ramík, Pavel
Abstract: Tato bakalářská práce zpracovává téma měření výkonu a krouticího momentu spalovacího motoru na válcovém dynamometru. Cílem práce bylo na základě provedené rešerše poukázat na výhody a nevýhody jednotlivých typů dynamometrů, zpracovat přehled norem pro měření výkonu na válcovém dynamometru, vliv atmosférických podmínek, odporů a skluzů. Práce také popisuje, vývoj, různá konstrukční řešení válcového dynamometru, vlivu velikosti válců na valivý odpor a deformaci pneumatiky, vhodné dynamometry pro válcovou zkušebnu, vybavení zkušebny, zatěžovací módy a rozdíly mezi statickou a dynamickou zkouškou. Závěrem je provedena predikce budoucího vývoje těchto zařízení s ohledem na dokonalejší podvozkové systémy vozidel a vývoj elektromobilů., This bachelor thesis deals with topic measuring the power and the torque of internal combustion engines on chassis dynamometer. The aim of the thesis was to show advantages and disadvantages of different types of dynamometers, to make review of standards for measuring power on chassis dynamometer, effect of atmospheric conditions, resistances and slippage. Thesis also describes evolution, different designs of chassis dynamometers, effect of roller diameter to rolling resistance and deformation of tire, suitable types of dynamometers for chassis dynamometer, equipment of testing room, modes of operating and differences between static and dynamic power testing. In the end I have made prediction of incoming development devices of this type with regard to evolution of intelligent chassis control systems and electric vehicles.

38. Metody snižování spotřeby moderních vozidel

Author: Štětina, Josef, Pech, Ondřej, Štětina, Josef, and Pech, Ondřej
Abstract: V tejto práci sú zhrnuté základné poznatky z termomechaniky spaľovacích motorov, pričom dôraz bol kladený na účinnosť spaľovacích motorov, tepelné obehy a ich popis pomocou teoretických a indikátorových diagramov. Je uvedená klasifikácia účinností a ich jednotlivé definície. V ďalšej časti sa práca zameriava na niektoré systémy používané v moderných vozidlách, ktoré zvyšujú účinnosť spaľovacích motorov a znižujú spotrebu paliva. Taktiež sa venuje koncepčným riešeniam, ktoré sú pripravované do sériovej výroby. Posledná časť práce sa sústreďuje na techniku úspornej jazdy a znižovanie jazdných odporov. Záver práce poukazuje na smer, ktorým sa bude vývoj automobilov uberať., This thesis summarizes the basic knowledge of thermodynamics of internal combustion engines. Emphasis was put on engine efficiency and engine cycles, described by theoretical and indicator diagrams. It also introduces classification of engine efficiencies, and their respective definitions. The next section focuses on some systems used in modern vehicles, that improves engine efficiency and reduces fuel consumption. Moreover it includes conceptual solutions, that are in preparation for mass production. The last part of this thesis concentrates on economical driving techniques, and reduction of driving resistance. In conclusion, the thesis shows the direction of next development of automobiles.

39. Metody snižování spotřeby moderních vozidel

Author: Štětina, Josef, Pech, Ondřej, Štětina, Josef, and Pech, Ondřej
Abstract: V tejto práci sú zhrnuté základné poznatky z termomechaniky spaľovacích motorov, pričom dôraz bol kladený na účinnosť spaľovacích motorov, tepelné obehy a ich popis pomocou teoretických a indikátorových diagramov. Je uvedená klasifikácia účinností a ich jednotlivé definície. V ďalšej časti sa práca zameriava na niektoré systémy používané v moderných vozidlách, ktoré zvyšujú účinnosť spaľovacích motorov a znižujú spotrebu paliva. Taktiež sa venuje koncepčným riešeniam, ktoré sú pripravované do sériovej výroby. Posledná časť práce sa sústreďuje na techniku úspornej jazdy a znižovanie jazdných odporov. Záver práce poukazuje na smer, ktorým sa bude vývoj automobilov uberať., This thesis summarizes the basic knowledge of thermodynamics of internal combustion engines. Emphasis was put on engine efficiency and engine cycles, described by theoretical and indicator diagrams. It also introduces classification of engine efficiencies, and their respective definitions. The next section focuses on some systems used in modern vehicles, that improves engine efficiency and reduces fuel consumption. Moreover it includes conceptual solutions, that are in preparation for mass production. The last part of this thesis concentrates on economical driving techniques, and reduction of driving resistance. In conclusion, the thesis shows the direction of next development of automobiles.

40. Návrh pohonu prototypu pro Shell Eco-marathon

Author: Štětina, Josef, Klimeš, Lubomír, Štětina, Josef, and Klimeš, Lubomír
Abstract: V bakalářské práci je řešeno pohonné ústrojí soutěžního vozu. V úvodu jsou shrnuta pravidla soutěže. Dále jsou řešeny jízdní odpory a varianty pohonného ústrojí vozidla, jehož hlavním cílem je dosáhnout nízké spotřeby. Řešení je zaměřeno na koncept řazení rychlostí v planetovém náboji v kombinaci s užitím synchronního řemenového převodu. V konstrukci je k pohonu použit motor Honda GX25 s odstředivou spojkou a rozměr hnaného kola je 20". Řešení je znázorněno ve výkresu sestavení., In the bachelor thesis, the drivetrain design of the racing car is solved and described. The competition rules are summarized in the introduction. Then the driving resistances and drivetrain design variants are evaluated, which main objective is to achieve low fuel consumption. The solution is focused on the concept of a planetary gear-shifting hub, in combination with the synchronous belt drive. The Honda GX25 engine with a centrifugal clutch and the driven wheel dimension of 20” is used to drive the design. The design solution is shown at the assembly drawing.

41. Návrh pohonu prototypu pro Shell Eco-marathon

Author: Štětina, Josef, Klimeš, Lubomír, Štětina, Josef, and Klimeš, Lubomír
Abstract: V bakalářské práci je řešeno pohonné ústrojí soutěžního vozu. V úvodu jsou shrnuta pravidla soutěže. Dále jsou řešeny jízdní odpory a varianty pohonného ústrojí vozidla, jehož hlavním cílem je dosáhnout nízké spotřeby. Řešení je zaměřeno na koncept řazení rychlostí v planetovém náboji v kombinaci s užitím synchronního řemenového převodu. V konstrukci je k pohonu použit motor Honda GX25 s odstředivou spojkou a rozměr hnaného kola je 20". Řešení je znázorněno ve výkresu sestavení., In the bachelor thesis, the drivetrain design of the racing car is solved and described. The competition rules are summarized in the introduction. Then the driving resistances and drivetrain design variants are evaluated, which main objective is to achieve low fuel consumption. The solution is focused on the concept of a planetary gear-shifting hub, in combination with the synchronous belt drive. The Honda GX25 engine with a centrifugal clutch and the driven wheel dimension of 20” is used to drive the design. The design solution is shown at the assembly drawing.

42. Koncepční návrh dvoutoké převodovky

Author: Řehák, Kamil, Prokop, Aleš, Řehák, Kamil, and Prokop, Aleš
Abstract: Tato práce se zabývá koncepčním návrhem dvoutoké převodovky a následnou kontrolou vybraných navržených částí této převodovky. První část práce je věnována teorii řadicích ústrojí v automobilech a následnému rozboru již dostupných dvoutokých převodovek. Dále se práce zaměřuje již na samotný koncepční návrh, který vychází ze zvoleného vozidla, na kterém bude převodovka umístěna a jeho jízdních odporech. Na základě těchto výchozích hodnot je zvoleno odstupňování převodovky, které má vliv na jízdní dynamiku vozidla. S ohledem na zástavbový prostor je pak navrženo koncepční uspořádání převodovky. Dále se práce zabývá základním konstrukčním návrhem a výpočty jednotlivých funkčních částí převodového ústrojí. Poslední část práce je věnována kontrole vybraných konstrukčních uzlů pomocí metody konečných prvků provedených v softwaru Ansys Workbench. Celá práce tak popisuje jednotlivé kroky pro návrh základní koncepce dvoutoké převodovky a konstrukci jejich základních komponent., This thesis deals with the conceptual design of a double clutch gearbox and the inspection of selected designed parts of this gearbox. The first part of the thesis is focused on the theory of automotive transmissions and analysis of already available double clutch gearboxes. The following is the conceptual design itself, which is based on the selected vehicle on which the transmission will be located and on driving resistances. Based on these default values, the gear graduation is selected, which affects the vehicle’s driving dynamics. With regard to the installation space, a conceptual arrangement of the gearbox is proposed. Furthermore, the thesis is focused on the basic design and calculations of individual functional components of the gearbox. The last part of the thesis is involved to the control of selected structural nodes using the finite element method in the ansys workbench software. The whole thesis describes the individual steps for the design of the basic concept of a double clutch gearbox and the design of their basic components.

43. Koeficient valivého odporu pneumatik

Author: Hejtmánek, Petr, Blaťák, Ondřej, Hejtmánek, Petr, and Blaťák, Ondřej
Abstract: Tato bakalářská práce se zaměřuje na koeficient valivého odporu pneumatik jak z pohledu faktorů, které tento koeficient ovlivňují, tak z pohledu experimentálních metod pro jeho stanovení. V první části práce jsou detailně rozebrány klíčové faktory ovlivňující koeficient valivého odporu. Následuje popis metod používaných k měření valivého odporu v laboratorních a reálných podmínkách. Práce pokračuje přehledem typických hodnot koeficientu valivého odporu pneumatik různých kategorií, které byly ještě rozděleny do podkategorií a vzájemně porovnávány. Poslední část práce se věnuje principiálnímu návrhu měřicího zařízení pro měření valivého odporu. Návrh zohledňuje cenové náklady a možnost získání osvědčení o technické způsobilosti k provozu vozidla na pozemních komunikacích. V návrhu měřicího zařízení byly vybrány konkrétní měřící přístroje a komponenty potřebné pro homologační proces a byla vytvořena cenová kalkulace známých dílů., This bachelor thesis focuses on the rolling resistance coefficient of tyres both in terms of the factors that influence this coefficient and in terms of experimental methods for its determination. In the first part of the thesis, the key factors affecting the rolling resistance coefficient are discussed in detail. This is followed by a description of the methods used to measure rolling resistance in laboratory and real-world conditions. The thesis continues with an overview of typical rolling resistance coefficient values for tyres of different categories, which have been further divided into subcategories and compared with each other. The last part of the thesis is devoted to the principal design of a measuring device for rolling resistance measurement. The design takes the cost and capability of obtaining a certificate of roadworthiness into account. Specific measuring instruments and components needed for the homologation process were selected and price calculation of known parts was made.

44. Koeficient valivého odporu pneumatik

Author: Hejtmánek, Petr, Blaťák, Ondřej, Hejtmánek, Petr, and Blaťák, Ondřej
Abstract: Tato bakalářská práce se zaměřuje na koeficient valivého odporu pneumatik jak z pohledu faktorů, které tento koeficient ovlivňují, tak z pohledu experimentálních metod pro jeho stanovení. V první části práce jsou detailně rozebrány klíčové faktory ovlivňující koeficient valivého odporu. Následuje popis metod používaných k měření valivého odporu v laboratorních a reálných podmínkách. Práce pokračuje přehledem typických hodnot koeficientu valivého odporu pneumatik různých kategorií, které byly ještě rozděleny do podkategorií a vzájemně porovnávány. Poslední část práce se věnuje principiálnímu návrhu měřicího zařízení pro měření valivého odporu. Návrh zohledňuje cenové náklady a možnost získání osvědčení o technické způsobilosti k provozu vozidla na pozemních komunikacích. V návrhu měřicího zařízení byly vybrány konkrétní měřící přístroje a komponenty potřebné pro homologační proces a byla vytvořena cenová kalkulace známých dílů., This bachelor thesis focuses on the rolling resistance coefficient of tyres both in terms of the factors that influence this coefficient and in terms of experimental methods for its determination. In the first part of the thesis, the key factors affecting the rolling resistance coefficient are discussed in detail. This is followed by a description of the methods used to measure rolling resistance in laboratory and real-world conditions. The thesis continues with an overview of typical rolling resistance coefficient values for tyres of different categories, which have been further divided into subcategories and compared with each other. The last part of the thesis is devoted to the principal design of a measuring device for rolling resistance measurement. The design takes the cost and capability of obtaining a certificate of roadworthiness into account. Specific measuring instruments and components needed for the homologation process were selected and price calculation of known parts was made.

45. Koeficient valivého odporu pneumatik

Author: Hejtmánek, Petr, Blaťák, Ondřej, Hejtmánek, Petr, and Blaťák, Ondřej
Abstract: Tato bakalářská práce se zaměřuje na koeficient valivého odporu pneumatik jak z pohledu faktorů, které tento koeficient ovlivňují, tak z pohledu experimentálních metod pro jeho stanovení. V první části práce jsou detailně rozebrány klíčové faktory ovlivňující koeficient valivého odporu. Následuje popis metod používaných k měření valivého odporu v laboratorních a reálných podmínkách. Práce pokračuje přehledem typických hodnot koeficientu valivého odporu pneumatik různých kategorií, které byly ještě rozděleny do podkategorií a vzájemně porovnávány. Poslední část práce se věnuje principiálnímu návrhu měřicího zařízení pro měření valivého odporu. Návrh zohledňuje cenové náklady a možnost získání osvědčení o technické způsobilosti k provozu vozidla na pozemních komunikacích. V návrhu měřicího zařízení byly vybrány konkrétní měřící přístroje a komponenty potřebné pro homologační proces a byla vytvořena cenová kalkulace známých dílů., This bachelor thesis focuses on the rolling resistance coefficient of tyres both in terms of the factors that influence this coefficient and in terms of experimental methods for its determination. In the first part of the thesis, the key factors affecting the rolling resistance coefficient are discussed in detail. This is followed by a description of the methods used to measure rolling resistance in laboratory and real-world conditions. The thesis continues with an overview of typical rolling resistance coefficient values for tyres of different categories, which have been further divided into subcategories and compared with each other. The last part of the thesis is devoted to the principal design of a measuring device for rolling resistance measurement. The design takes the cost and capability of obtaining a certificate of roadworthiness into account. Specific measuring instruments and components needed for the homologation process were selected and price calculation of known parts was made.

46. Autonomní trakční vozidlo typu AGV

Author: Kašpárek, Jaroslav, Urbánek, Michal, Kašpárek, Jaroslav, and Urbánek, Michal
Abstract: Práce se zabývá konstrukčním návrhem autonomního trakčního vozidla typu AGV, sloužícího k zajištění materiálového toku. První část práce obsahuje rešerši autonomních vozíků s uvedením obdobných konceptů vyskytujících se na trhu. Druhá část obsahuje samotný návrh prototypu vozíku, což je výběr komponent, a to naváděcích a bezpečnostních, a návrh trakčního pohonu a trakčního akumulátoru. Na závěr je proveden návrh rámu se silovým výpočtem vybraného uzlu., The thesis deals with the design of an autonomous traction vehicle of a type AGV, used to purvey material flow. The first part of the thesis contains a research on the autonomous trucks with similar concepts offered on the market. The second part contains the description of the design of the prototype truck. It includes the selection of the guiding and safety components as well as the design of the traction drive and the traction battery. Finally, a frame design with force calculation of the selected node is performed.

47. Koncepční návrh dvoutoké převodovky

Author: Řehák, Kamil, Prokop, Aleš, Řehák, Kamil, and Prokop, Aleš
Abstract: Tato práce se zabývá koncepčním návrhem dvoutoké převodovky a následnou kontrolou vybraných navržených částí této převodovky. První část práce je věnována teorii řadicích ústrojí v automobilech a následnému rozboru již dostupných dvoutokých převodovek. Dále se práce zaměřuje již na samotný koncepční návrh, který vychází ze zvoleného vozidla, na kterém bude převodovka umístěna a jeho jízdních odporech. Na základě těchto výchozích hodnot je zvoleno odstupňování převodovky, které má vliv na jízdní dynamiku vozidla. S ohledem na zástavbový prostor je pak navrženo koncepční uspořádání převodovky. Dále se práce zabývá základním konstrukčním návrhem a výpočty jednotlivých funkčních částí převodového ústrojí. Poslední část práce je věnována kontrole vybraných konstrukčních uzlů pomocí metody konečných prvků provedených v softwaru Ansys Workbench. Celá práce tak popisuje jednotlivé kroky pro návrh základní koncepce dvoutoké převodovky a konstrukci jejich základních komponent., This thesis deals with the conceptual design of a double clutch gearbox and the inspection of selected designed parts of this gearbox. The first part of the thesis is focused on the theory of automotive transmissions and analysis of already available double clutch gearboxes. The following is the conceptual design itself, which is based on the selected vehicle on which the transmission will be located and on driving resistances. Based on these default values, the gear graduation is selected, which affects the vehicle’s driving dynamics. With regard to the installation space, a conceptual arrangement of the gearbox is proposed. Furthermore, the thesis is focused on the basic design and calculations of individual functional components of the gearbox. The last part of the thesis is involved to the control of selected structural nodes using the finite element method in the ansys workbench software. The whole thesis describes the individual steps for the design of the basic concept of a double clutch gearbox and the design of their basic components.

48. Koncepční návrh dvoutoké převodovky

Author: Řehák, Kamil, Prokop, Aleš, Řehák, Kamil, and Prokop, Aleš
Abstract: Tato práce se zabývá koncepčním návrhem dvoutoké převodovky a následnou kontrolou vybraných navržených částí této převodovky. První část práce je věnována teorii řadicích ústrojí v automobilech a následnému rozboru již dostupných dvoutokých převodovek. Dále se práce zaměřuje již na samotný koncepční návrh, který vychází ze zvoleného vozidla, na kterém bude převodovka umístěna a jeho jízdních odporech. Na základě těchto výchozích hodnot je zvoleno odstupňování převodovky, které má vliv na jízdní dynamiku vozidla. S ohledem na zástavbový prostor je pak navrženo koncepční uspořádání převodovky. Dále se práce zabývá základním konstrukčním návrhem a výpočty jednotlivých funkčních částí převodového ústrojí. Poslední část práce je věnována kontrole vybraných konstrukčních uzlů pomocí metody konečných prvků provedených v softwaru Ansys Workbench. Celá práce tak popisuje jednotlivé kroky pro návrh základní koncepce dvoutoké převodovky a konstrukci jejich základních komponent., This thesis deals with the conceptual design of a double clutch gearbox and the inspection of selected designed parts of this gearbox. The first part of the thesis is focused on the theory of automotive transmissions and analysis of already available double clutch gearboxes. The following is the conceptual design itself, which is based on the selected vehicle on which the transmission will be located and on driving resistances. Based on these default values, the gear graduation is selected, which affects the vehicle’s driving dynamics. With regard to the installation space, a conceptual arrangement of the gearbox is proposed. Furthermore, the thesis is focused on the basic design and calculations of individual functional components of the gearbox. The last part of the thesis is involved to the control of selected structural nodes using the finite element method in the ansys workbench software. The whole thesis describes the individual steps for the design of the basic concept of a double clutch gearbox and the design of their basic components.

49. Měření výkonu spalovacích motorů na válcovém dynamometru

Author: Štětina, Josef, Ramík, Pavel, Štětina, Josef, and Ramík, Pavel
Abstract: Tato bakalářská práce zpracovává téma měření výkonu a krouticího momentu spalovacího motoru na válcovém dynamometru. Cílem práce bylo na základě provedené rešerše poukázat na výhody a nevýhody jednotlivých typů dynamometrů, zpracovat přehled norem pro měření výkonu na válcovém dynamometru, vliv atmosférických podmínek, odporů a skluzů. Práce také popisuje, vývoj, různá konstrukční řešení válcového dynamometru, vlivu velikosti válců na valivý odpor a deformaci pneumatiky, vhodné dynamometry pro válcovou zkušebnu, vybavení zkušebny, zatěžovací módy a rozdíly mezi statickou a dynamickou zkouškou. Závěrem je provedena predikce budoucího vývoje těchto zařízení s ohledem na dokonalejší podvozkové systémy vozidel a vývoj elektromobilů., This bachelor thesis deals with topic measuring the power and the torque of internal combustion engines on chassis dynamometer. The aim of the thesis was to show advantages and disadvantages of different types of dynamometers, to make review of standards for measuring power on chassis dynamometer, effect of atmospheric conditions, resistances and slippage. Thesis also describes evolution, different designs of chassis dynamometers, effect of roller diameter to rolling resistance and deformation of tire, suitable types of dynamometers for chassis dynamometer, equipment of testing room, modes of operating and differences between static and dynamic power testing. In the end I have made prediction of incoming development devices of this type with regard to evolution of intelligent chassis control systems and electric vehicles.

50. Návrh pohonu prototypu pro Shell Eco-marathon

Author: Štětina, Josef, Klimeš, Lubomír, Štětina, Josef, and Klimeš, Lubomír
Abstract: V bakalářské práci je řešeno pohonné ústrojí soutěžního vozu. V úvodu jsou shrnuta pravidla soutěže. Dále jsou řešeny jízdní odpory a varianty pohonného ústrojí vozidla, jehož hlavním cílem je dosáhnout nízké spotřeby. Řešení je zaměřeno na koncept řazení rychlostí v planetovém náboji v kombinaci s užitím synchronního řemenového převodu. V konstrukci je k pohonu použit motor Honda GX25 s odstředivou spojkou a rozměr hnaného kola je 20". Řešení je znázorněno ve výkresu sestavení., In the bachelor thesis, the drivetrain design of the racing car is solved and described. The competition rules are summarized in the introduction. Then the driving resistances and drivetrain design variants are evaluated, which main objective is to achieve low fuel consumption. The solution is focused on the concept of a planetary gear-shifting hub, in combination with the synchronous belt drive. The Honda GX25 engine with a centrifugal clutch and the driven wheel dimension of 20” is used to drive the design. The design solution is shown at the assembly drawing.

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