599 results on '"measuring system"'
Search Results
2. Measuring the Dimension Accuracy of Products Created by 3D Printing Technology with the Designed Measuring System.
- Author
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Pollák, Martin, Sabol, Dominik, and Goryl, Karol
- Subjects
MOTION control devices ,MANUFACTURED products ,MEASUREMENT errors ,ACCELERATION (Mechanics) ,MANUFACTURING processes - Abstract
The integration of precision measurement techniques using depth scanners with PLC control provides new possibilities for increasing the efficiency and quality of measuring 3D printed products. Comprehensive analysis of measurements in combination with advanced algorithms can provide more accurate dimensional characteristics and the prediction of defects. The overall goal of such systems is to assess the accuracy and reliability of products manufactured by 3D printing technology, which will fundamentally affect their increased use in industrial sectors. The article describes the design and implementation of a control system for a servo drive used in the proposed solution of a measuring system with a depth sensor, primarily oriented to the control and precise measurement of manufactured products by 3D printing technology. The entire program plan is implemented through the CCW software ver. 12 (Connected Component Workbench) and micro motion control devices. The connection of the servo drive itself is realized by combinations of the servo drive with the HMI (Human Machine Interface) panel and the servo drive with the PLC controller. It is the PLC controller that is subject to the created program in the CCW software, which can be used to control the direction, position, speed, and acceleration of the servomotor. The result is the design of a measurement scanning system with precise motion control through a connected servo drive intended for industrial applications of object error detection and measurement of dimension accuracy. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
- Full Text
- View/download PDF
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3. Development and validation of a screening tool for sarcopenia in Chinese nursing home residents
- Author
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Kaili Sun, Xucheng Wu, Jiening Yu, Weiran Chen, Xueqing Jia, Dongwen Li, Hao Lyu, Wenhai Huang, Hongqing Tian, Weijing Gao, Bin Zhu, Xinwei Lyu, Li Wang, Jing Shao, Xiaoting Liu, and Zuyun Liu
- Subjects
Public health ,Diagnostic procedure ,Measuring system ,Science - Abstract
Summary: Sarcopenia, characterized by the loss of muscle mass and function, is a critical health issue in nursing home residents. Given the high prevalence of sarcopenia in care settings, effective screening is crucial. This study compared the diagnostic accuracy of two conventional sarcopenia screening tools, SARC-F and SARC-CalF, and developed an alternative tool, SEAC, specifically for nursing home residents. In a sample of 679 older adults from Zhejiang Province, SARC-CalF exhibited better sensitivity and diagnostic accuracy compared to SARC-F. The SEAC tool, incorporating strength, exhaustion, assistance in walking, and calf circumference, demonstrated the highest diagnostic accuracy and sensitivity among the three screening tools. These findings suggest that SEAC could serve as a valuable tool for large-scale sarcopenia screening in nursing homes, potentially improving early detection and management of sarcopenia in this vulnerable population. more...
- Published
- 2024
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- View/download PDF
4. Multiphase Flow's Volume Fractions Intelligent Measurement by a Compound Method Employing Cesium-137, Photon Attenuation Sensor, and Capacitance-Based Sensor.
- Author
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Mayet, Abdulilah Mohammad, Fouladinia, Farhad, Hanus, Robert, Parayangat, Muneer, Raja, M. Ramkumar, Muqeet, Mohammed Abdul, and Mohammed, Salman Arafath
- Subjects
- *
ARTIFICIAL neural networks , *MASS attenuation coefficients , *MULTIPHASE flow , *VOLUME measurements , *RESEARCH personnel - Abstract
Multiphase fluids are common in many industries, such as oil and petrochemical, and volume fraction measurement of their phases is a vital subject. Hence, there are lots of scientists and researchers who have introduced many methods and equipment in this regard, for example, photon attenuation sensors, capacitance-based sensors, and so on. These approaches are non-invasive and for this reason, are very popular and widely used. In addition, nowadays, artificial neural networks (ANN) are very attractive in a lot of fields and this is because of their accuracy. Therefore, in this paper, to estimate volume proportion of a three-phase homogeneous fluid, a new system is proposed that contains an MLP ANN, standing for multilayer perceptron artificial neural network, a capacitance-based sensor, and a photon attenuation sensor. Through computational methods, capacities and mass attenuation coefficients are obtained, which act as inputs for the proposed network. All of these inputs were divided randomly in two main groups to train and test the presented model. To opt for a suitable network with the lowest rate of mean absolute error (MAE), a number of architectures with different factors were tested in MATLAB software R2023b. After receiving MAEs equal to 0.29, 1.60, and 1.67 for the water, gas, and oil phases, respectively, the network was chosen to be presented in the paper. Hence, based on outcomes, the proposed approach's novelty is being able to predict all phases of a homogeneous flow with very low error. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
- Full Text
- View/download PDF
5. Dimensional Measuring System with Temperature Compensation
- Author
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Zujić, Nemanja, Dihovicni, Djordje, Kacprzyk, Janusz, Series Editor, Gomide, Fernando, Advisory Editor, Kaynak, Okyay, Advisory Editor, Liu, Derong, Advisory Editor, Pedrycz, Witold, Advisory Editor, Polycarpou, Marios M., Advisory Editor, Rudas, Imre J., Advisory Editor, Wang, Jun, Advisory Editor, Keser, Tomislav, editor, Ademović, Naida, editor, Desnica, Eleonora, editor, and Grgić, Ivan, editor more...
- Published
- 2024
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6. Design and implementation of a measuring system used to evaluate the mechanical performance of the bone fixators
- Author
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Guo, Zhanshe, Liang, Xiangdang, and Wang, Sen
- Published
- 2023
- Full Text
- View/download PDF
7. Analysis of the Condition of a Gas Turbine System. 3. Using Machine Learning.
- Author
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Blinov, V. L. and Deryabin, G. A.
- Abstract
A method based on machine learning is proposed for assessing the condition of a gas turbine system for transporting natural gas. The initial data are archived gas-dynamic parameters recorded by the automatic control system. The initial data set is created by determining the power from the change in enthalpy of the natural gas before and beyond the pump. The software is written in Python. The Sci-kit library is used for the machine learning models. The quality of prediction is assessed in terms of the mean absolute error (%). The quality of prediction of the machine learning models is assessed with different parameter sets and sample sizes. Recommendations are made regarding the use of the models. [ABSTRACT FROM AUTHOR] more...
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- 2024
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8. 水下基床整平测量系统的研发与应用.
- Author
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张海成 and 陈龙海
- Abstract
Copyright of Guangdong Architecture Civil Engineering is the property of Guangdong Architecture Civil Engineering Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) more...
- Published
- 2024
- Full Text
- View/download PDF
9. USING THE MONTE CARLO METHOD FOR CALCULATING THE ERROR OF THE MEASUREMENT SYSTEM
- Author
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Є.І. Байда and М.Г. Пантелят
- Subjects
method monte carlo method ,calculation of system’s error ,measuring system ,Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 - Abstract
The article considers the Monte Carlo method as one of the possible techniques for calculating the error of a measuring system, which consists of several elements, each of which measures some quantity with its own independent error. Due to its features, the method can be extended to modeling any process affected by random variables. The simplicity of application and the calculation algorithm makes it possible to easily calculate the total error of the system and the probability of its occurrence, while avoiding inflated and unlikely values. The article substantiates the application of the Monte Carlo method for calculating the error of the measuring system, reveals the nature of the distribution of errors, and calculates the value of the error depending on the probability of its occurrence. It is shown that with probability of 0.95 the total error of the system can be taken to be 3 times smaller than the maximum possible error. References 8, figures 2, table 1. more...
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- 2024
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10. Method for Converting the Output of Measuring System into the Output of System with Given Basis
- Author
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Revunova, Elena, Burtniak, Volodymyr, Zabulonov, Yuriy, Stokolos, Maksym, Krasnoholovets, Volodymyr, Kacprzyk, Janusz, Series Editor, and Zaporozhets, Artur, editor
- Published
- 2023
- Full Text
- View/download PDF
11. Multiphase Flow’s Volume Fractions Intelligent Measurement by a Compound Method Employing Cesium-137, Photon Attenuation Sensor, and Capacitance-Based Sensor
- Author
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Abdulilah Mohammad Mayet, Farhad Fouladinia, Robert Hanus, Muneer Parayangat, M. Ramkumar Raja, Mohammed Abdul Muqeet, and Salman Arafath Mohammed
- Subjects
capacitance-based sensor ,photon attenuation sensor ,ANN ,volume fraction ,measuring system ,multiphase homogeneous fluid ,Technology - Abstract
Multiphase fluids are common in many industries, such as oil and petrochemical, and volume fraction measurement of their phases is a vital subject. Hence, there are lots of scientists and researchers who have introduced many methods and equipment in this regard, for example, photon attenuation sensors, capacitance-based sensors, and so on. These approaches are non-invasive and for this reason, are very popular and widely used. In addition, nowadays, artificial neural networks (ANN) are very attractive in a lot of fields and this is because of their accuracy. Therefore, in this paper, to estimate volume proportion of a three-phase homogeneous fluid, a new system is proposed that contains an MLP ANN, standing for multilayer perceptron artificial neural network, a capacitance-based sensor, and a photon attenuation sensor. Through computational methods, capacities and mass attenuation coefficients are obtained, which act as inputs for the proposed network. All of these inputs were divided randomly in two main groups to train and test the presented model. To opt for a suitable network with the lowest rate of mean absolute error (MAE), a number of architectures with different factors were tested in MATLAB software R2023b. After receiving MAEs equal to 0.29, 1.60, and 1.67 for the water, gas, and oil phases, respectively, the network was chosen to be presented in the paper. Hence, based on outcomes, the proposed approach’s novelty is being able to predict all phases of a homogeneous flow with very low error. more...
- Published
- 2024
- Full Text
- View/download PDF
12. Quadcopter Modeling Using a System for UAV Parameters Measurement
- Author
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Jozef Novotňák, Zoltán Szőke, Patrik Kašper, and Miroslav Šmelko
- Subjects
UAV model ,quadcopter ,UAV parameters ,measuring system ,quadcopter modeling ,Motor vehicles. Aeronautics. Astronautics ,TL1-4050 - Abstract
This article deals with quadcopter modeling using a system for the measurement of unmanned aerial vehicle (UAV) parameters. UAVs are often equipped with various measurement devices and equipment for measurement, which significantly affects their weight. The currently available technical solutions and inventions do not allow corrections to be made to the on-board control electronics settings without the need to perform a test flight, or without the need to create complex and time-consuming mathematical models of the unmanned aerial vehicle; therefore, it is desirable to create a new method for modeling the characteristics of an UAV based on static laboratory measurements. The goal of this paper is to create a dynamic model of a quadcopter that will be adapted to a system for measuring UAV parameters, specifically the thrust of individual motors, which will be the next step to creating a new method for modeling UAV characteristics. This method can be used in the future for tuning flight control algorithms, based on static laboratory measurements. more...
- Published
- 2024
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13. Analysis of the Condition of a Gas Turbine System. 2. Anomalies in the Degradation Process.
- Author
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Blinov, V. L. and Deryabin, G. A.
- Abstract
The decline in the condition of a gas turbine system for transporting natural gas is investigated. The degradation coefficient is obtained by analysis of data from the system's measuring equipment. It is important to determine the condition of equipment on the basis of its operational parameters, since that would abbreviate thermal testing and permit maintenance and repair of the equipment on the basis of its condition rather than on a fixed schedule. Besides assessing the condition of the equipment, the proposed algorithm permits the identification of anomalies in the initial and final data. Expert analysis reveals anomalous zones in the downward trend of the gas turbine system's condition over time. [ABSTRACT FROM AUTHOR] more...
- Published
- 2023
- Full Text
- View/download PDF
14. Industrial Design of Yarn Speed Monitoring System in Positive Feed Circular Knitting Machine.
- Author
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Heravi, Mohammad Ehsan Momeni
- Abstract
The article focuses on the industrial design of a Yarn Speed Monitoring System for a Positive Feed Circular Knitting Machine. Topics include the importance of maintaining uniform yarn feeding speed for high-quality fabric, the design and construction of the monitoring system, and the results and benefits of implementing this system. more...
- Published
- 2023
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- View/download PDF
15. Analysis of the Condition of a Gas Turbine System. 1. Analysis of Measurement Data.
- Author
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Blinov, V. L. and Deryabin, G. A.
- Abstract
Analysis of the initial data from the regular measuring systems for gas-turbine equipment permits the development of an automated system for assessing the condition of the equipment in the course of operation. Potentially, this automated system will reduce the need for thermal tests and will permit maintenance on the basis of the equipment's actual technical condition. A mathematical algorithm is developed to generate a coefficient characterizing the condition of the gas turbine system on the basis of measurement data regarding its steady operation. Software produced using the Python 3 language permits investigation of actual operational data and the development of recommendations for engineering practice. [ABSTRACT FROM AUTHOR] more...
- Published
- 2023
- Full Text
- View/download PDF
16. Industrial Design of Yarn Speed Monitoring System in Positive Feed Circular Knitting Machine
- Author
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Mohammad Ehsan Momeni Heravi
- Subjects
circular weft knitting machine ,positive yarn feeding system ,automation ,measuring system ,Textile bleaching, dyeing, printing, etc. ,TP890-933 - Abstract
As constant yarn feeding tension is essential in the formation of uniform stitches, the lack of a monitoring system in a circular weft knitting machine capable of measuring the uniformity of the yarn feeding speed in different driven belts and comparing the feeding rate during the knitting process has led to the use of experimental methods which are dependent on skilled operators. Additionally, in the case of any defects, the equalisation is done by the operator using the trial-and-error method, which consequently increases the risk of human error. Considering the importance of a uniform adjustment of yarn feeding speed on the quality of final fabrics, a monitoring system for measuring and reporting yarn feeding speed was designed. Following its installation on a circular weft knitting machine, the performance of the system in an industrial environment was evaluated. A comparison with the traditional system proved the functionality of the designed automation process. The current study highlights the characteristics of an appropriate sensor, the applicable installation place and direct data reception without intermediaries. more...
- Published
- 2023
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17. Gear Grinding Stock Alignment in Advance of Grinding
- Author
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Larshin, Vasily, Lishchenko, Natalia, Lysyi, Oleksandr, Uminsky, Sergey, Cavas-Martínez, Francisco, Series Editor, Chaari, Fakher, Series Editor, di Mare, Francesca, Series Editor, Gherardini, Francesco, Series Editor, Haddar, Mohamed, Series Editor, Ivanov, Vitalii, Series Editor, Kwon, Young W., Series Editor, Trojanowska, Justyna, Series Editor, Tonkonogyi, Volodymyr, editor, Oborskyi, Gennadii, editor, and Pavlenko, Ivan, editor more...
- Published
- 2022
- Full Text
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18. Measurement of CO Retention in Subea EasyBreath Masks Converted into Improvised COVID19 Protection Measures for Medical Services
- Author
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Stefański, Juliusz, Tomaszewski, Olaf, Iwaniec, Marek, Wesół, Jacek, Kacprzyk, Janusz, Series Editor, Pal, Nikhil R., Advisory Editor, Bello Perez, Rafael, Advisory Editor, Corchado, Emilio S., Advisory Editor, Hagras, Hani, Advisory Editor, Kóczy, László T., Advisory Editor, Kreinovich, Vladik, Advisory Editor, Lin, Chin-Teng, Advisory Editor, Lu, Jie, Advisory Editor, Melin, Patricia, Advisory Editor, Nedjah, Nadia, Advisory Editor, Nguyen, Ngoc Thanh, Advisory Editor, Wang, Jun, Advisory Editor, Piaseczna, Natalia, editor, Gorczowska, Magdalena, editor, and Łach, Agnieszka, editor more...
- Published
- 2022
- Full Text
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19. INCREASING ACCURACY OF MEASURING FUNCTIONING PARAMETERS OF AGRICULTURAL UNITS.
- Author
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Antoshchenkov, Roman, Antoshchenkova, Vitalina, Kis, Viktor, and Smitskov, Dmytro
- Subjects
- *
AGRICULTURAL industries , *AGRICULTURAL equipment , *ELECTRONIC data processing , *DETECTORS , *ACCELEROMETERS - Abstract
The paper substantiates the ways of increasing the accuracy of measuring the parameters of agricultural units (AU) functioning. It has been noted that agricultural machines and units work in conditions of vibrations and noises created by the environment and technological tools. Features of the movement of these systems and their compliance with their functional purpose are factors that determine the degree of perfection of AU. The study of the dynamics of AU operation requires new research methods and means, therefore a measuring system of the dynamics and energy of mobile machines was created. Increasing the accuracy of measuring parameters of AU operation is achieved by substantiating the data processing algorithm of the sensors of the measuring system. The main component of the measurement system is an inertial measurement unit (IMU), which consists of an accelerometer, a gyroscope, and a magnetometer. It was established that the signal measured by IMU consists of four components: real acceleration; angles of inclination of the AU element relative to the horizon; vibration and inherent noise of the sensor. The IMU installed on the tractor frame determined that the main spectrum of oscillations is in the range from 0 to 3 Hz. The maximum vibration energy corresponds to a frequency of 0.4 Hz. The second harmonic of the oscillations is at a frequency of 25 Hz for the three axes of the accelerometer. An algorithm for data processing by the measuring system has been developed, including processing with the Butterworth filter, compensation of centrifugal velocities, tilt angles, free fall acceleration. The Butterworth lowpass filter with a cut-off frequency of 3 Hz was used to compensate for the real acceleration. The speed and position data of the GPS receiver included in the measuring system must be processed by the Butterworth frequency filter with a cut-off frequency of 1 Hz. It was determined that the maximum traction power of the tractor is 108.0 kW. It was established that the power determined by the measuring system due to acceleration and data processing by the developed method is 101.3 kW. The error of measuring the traction power of the tractor is 6.2%. [ABSTRACT FROM AUTHOR] more...
- Published
- 2023
- Full Text
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20. Measurement of Tire-Pavement Contact Tri-Axial Stress Distribution Based on Sensor Array.
- Author
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Guan, Jiaxi, Zhou, Xinglin, Liu, Lu, and Ran, Maoping
- Subjects
STRESS concentration ,SENSOR arrays ,ASPHALT pavements ,ROLLING friction - Abstract
A tire's three-dimensional stress for pavement is an important cause of asphalt pavement disease. In order to study the contact stress distribution between the tire and the pavement under real conditions, a sensor that can measure the tri-axial stress synchronously is designed, and a complete measurement system is established. The variation trend and stress value of tri-axial stress under steady rolling of the tire were obtained, and the stress distribution characteristics were analyzed. The results show that the stress in the three directions near the tire shoulder is greater than that in the crown area, and the stress peak moves gradually from front to back with the rolling of the tire. Compared with the simplified simulation model, these results provides valuable suggestions for exploring the real tire-pavement interaction. [ABSTRACT FROM AUTHOR] more...
- Published
- 2023
- Full Text
- View/download PDF
21. Reducing the Impact of Influence Factors on the Measurement Results from Single-Coil Eddy Current Sensors.
- Author
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Borovik, Sergey, Kuteynikova, Marina, and Sekisov, Yuriy
- Subjects
- *
SENSOR placement , *EDDIES , *DETECTORS , *INTERNAL combustion engines , *EDDY current testing , *GAS turbines , *STRUCTURAL health monitoring , *HIGH temperatures , *TRANSDUCERS - Abstract
Single-coil eddy current sensors (SCECS) form a separate and independent branch among the existing eddy current probes. Such sensors are often used for aviation and aerospace applications where the conditions accompanying the measuring process are harsh and even extreme. High temperatures (up to +600 °C in the compressor and over +1000 °C in the turbine of gas turbine engines), the complex shape surfaces of the monitored parts, the multidimensional movement of the power plants' structural elements, restrictions on the probes number and their placement in the measuring zone are the main factors affecting the reliability and accuracy of the measurement results obtained by the sensors. The article provides an overview of the relevant approaches and methods for reducing the impact of influence factors on the measurement results from SCECS based on the extensive experience of more than 30 years of research and development being carried out in the Institute for the Control of Complex Systems of Russian Academy of Sciences. The scope of the solutions discussed in the article is not limited to SCECS measurement systems only but can also be extended to the systems with primary transducers of other designs or other physical principles. [ABSTRACT FROM AUTHOR] more...
- Published
- 2023
- Full Text
- View/download PDF
22. New Emissivity Measuring System with High Accuracy Under Controlled Environment Conditions.
- Author
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Zhang, Kaihua, Hu, Qingqing, Yu, Kun, and Liu, Yufang
- Subjects
- *
EMISSIVITY , *EMISSIVITY measurement , *SPECTRAL sensitivity , *BACKGROUND radiation , *SILICON carbide , *SURFACE temperature - Abstract
Accurate knowledge of spectral emissivity is very important in many technological and scientific applications. In this study, a new measuring system, which can realizes spectral directional emissivity measurements under controlled environment conditions, was constructed. The apparatus realizes the high accuracy emissivity measurement through the precision knowledge of the sample surface temperature and the high-precision calibration. The temperature of the sample surface is accurately measured by the suitable method depending on the sample type. Accurately determining the spectral response function and the background radiation are obtained by the modified two-temperature calibration method proposed in this study. The evaluation of the assisted blackbody shows that it has good temperature uniformity and high emissivity, which guarantee the effectiveness of the modified two-temperature calibration method. Spectral emissivity of silicon carbide was measured, and the conformity with literature data around the Christiansen wavelength proves the reliability of the developed apparatus. In addition, the spectral emissivity of copper during the real time oxidation was measured to check the capability of the emissivity measurements under controlled environment. Finally, the uncertainty for silicon carbide at 1073 K is evaluated, and the relative combined standard uncertainty for silicon carbide sample at 1073 K is better than 2.9 %. [ABSTRACT FROM AUTHOR] more...
- Published
- 2023
- Full Text
- View/download PDF
23. Preliminary Design of a Climate Controlled Environmental Test and Measurement.
- Author
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Lázár, Bence, Szabolcsi, Róbert, and Menyhárt, József
- Subjects
CLIMATE change ,ENVIRONMENTAL testing ,RADIOISOTOPES ,SOLAR panels ,SANDSTORMS - Abstract
Climate chambers play an important role in the design and testing process. Several different chambers have been built over the years, specialising in different areas. It means there is a wide choice on the market and as a consequence, parameters necessary for us limit when choosing the ideal test chamber. Our instruments might be subjected to several environmental effects which require a lot of time and effort to be tested. An example is the Mars rover. NASA's Perseverance Mars rover was equipped with 2 pieces of Li-ion battery packs and the old solar charging was replaced by RTG (Radioisotope Thermoelectric Generator) thus a generator feeds the electricity consumers of the rover. Temperature on the surface of Mars varies from -150 C° to 20 C°. In addition, there are huge storms at regular interval lasting for month sometimes. These storms cause great difficulties because, on the one hand, the main power source on older types was the solar panels, and storms can cover them with Martian dust, limiting or eliminating their power supply. On the other hand, large sandstorms can completely cover the rover, and once the sandstorm is over, the Mars rover has to free itself from its trap. In addition, there were many other factors that engineers had to consider in the design. It is a well-known fact that we are not able to consider all the possible environmental conditions in design, and it is also known that some measurements may be inaccurate, so the prototypes produced have to be tested on the ground. The ground tests must ensure that the operating conditions on Mars are maintained. Special test chambers have been developed for this purpose. [1] The aim of the authors is to design and build a prototype of a climate chamber of their own design. An important component of the chamber is a measurement data acquisition system, which allows the collection of measured data and their preliminary processing. [ABSTRACT FROM AUTHOR] more...
- Published
- 2023
- Full Text
- View/download PDF
24. Utilisation of Production Knowledge in Developing a Modern Customer-Oriented Project Business Environment.
- Author
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VUORELA, Jyri, OLLIKAINEN, Mikael, SALMINEN, Vesa, and VARIS, Juha
- Subjects
- *
BUSINESS development , *BUSINESS models , *ECOLOGY - Abstract
History has shown different approaches to improving productivity the way of companies do business. Since the early 1900s, the development of different production systems has played an increasingly remarkable role in global manufacturing countries. It seems, that the growth of understanding has widened the ideology of production systems used up to current ones. This article examines the development path of business development. It evaluates the suitability of the key tools used to support change in a modern business model in a customer-driven project business environment. [ABSTRACT FROM AUTHOR] more...
- Published
- 2022
- Full Text
- View/download PDF
25. 实体保持架兜孔梁宽变动量测量方法分析.
- Author
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曹阳, 高强, 刘斌, and 孙慧广
- Abstract
Copyright of Bearing is the property of Bearing Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) more...
- Published
- 2022
- Full Text
- View/download PDF
26. Monitorowanie wybranych parametrów komutatorów i pierścieni ślizgowych maszyn elektrycznych bez wyłączania ich z ruchu.
- Author
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URZĘDNICZOK, Henryk
- Subjects
INSTALLATION of industrial equipment ,COMMUTATION (Electricity) ,MACHINERY ,TEMPERATURE - Abstract
Copyright of Przegląd Elektrotechniczny is the property of Przeglad Elektrotechniczny and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) more...
- Published
- 2022
- Full Text
- View/download PDF
27. Stanowisko do pomiaru przewodności elektrycznej próbek stopów metali o małych gabarytach.
- Author
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GRZENIK, Michał, KUBICZEK, Krzysztof, and KAMPIK, Marian
- Subjects
ELECTRIC conductivity ,ELECTRICAL conductivity measurement ,ALLOYS - Abstract
Copyright of Przegląd Elektrotechniczny is the property of Przeglad Elektrotechniczny and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) more...
- Published
- 2022
- Full Text
- View/download PDF
28. Measuring System for Determining the Quality of LED Light Sources and an Overview of LED Light Bulbs for Household Use.
- Author
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Markovič, Matic, Orgulan, Andrej, and Sukič, Primož
- Subjects
- *
LIGHT bulbs , *LUMINOUS flux , *LIGHT sources , *HOUSEHOLDS , *MANUFACTURING industries , *ANGULAR distribution (Nuclear physics) - Abstract
Modern LED light sources have many advantages, as well as some disadvantages. One of the disadvantages is the pulsating luminous flux, which, in some cases, affects people's health and well-being negatively. The paper describes the design and making process of a measuring system for determining the quality of LED substitutes for conventional light bulbs and gives an overview of LED light bulbs for household use. The measurement system is controlled using the MATLAB software environment, in which data processing and plotting of the results are also performed. We acquired 59 different LED light bulbs from 37 manufacturers, and performed the measurements. The light bulbs are classified based on the percentage of fluctuations in the luminous flux, and the percentage of deviation of the measured luminous flux compared to the value stated on the packaging by the manufacturer. [ABSTRACT FROM AUTHOR] more...
- Published
- 2022
- Full Text
- View/download PDF
29. Estimation of Spatial-Temporal Gait Parameters Using a Momentary-Contact-Sensors-Based System: A Preliminary Evaluation
- Author
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Dias, Wellingtânia Domingos, Sesselmann, Meinhard, Brito, Iury Cardoso, Capanema, Ivo Oliveira, de Abreu Chaves, Maria Emilia, Kirkwood, Renata, Huebner, Rudolf, Howlett, Robert J., Series Editor, Jain, Lakhmi C., Series Editor, Iano, Yuzo, editor, Arthur, Rangel, editor, Saotome, Osamu, editor, Kemper, Guillermo, editor, and Padilha França, Reinaldo, editor more...
- Published
- 2021
- Full Text
- View/download PDF
30. Monitoring the Air Pollution with UAVs
- Author
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Babak, Vitaliy P., Babak, Serhii V., Eremenko, Volodymyr S., Kuts, Yurii V., Myslovych, Mykhailo V., Scherbak, Leonid M., Zaporozhets, Artur O., Kacprzyk, Janusz, Series Editor, Babak, Vitaliy P., Babak, Serhii V., Eremenko, Volodymyr S., Kuts, Yurii V., Myslovych, Mykhailo V., Scherbak, Leonid M., and Zaporozhets, Artur O. more...
- Published
- 2021
- Full Text
- View/download PDF
31. THE PRESENT STATE OF THE INFORMATION-MEASURING SYSTEMS FOR CHECKING HIGH VOLTAGE CONVERTERS
- Author
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A.S. Ilin, I.M. Rybakov, A.V. Lysenko, and N.K. Yurkov
- Subjects
high voltage ,verification ,measuring system ,software ,automation ,Engineering (General). Civil engineering (General) ,TA1-2040 - Abstract
Background. The relevance of the information-measuring system (IMS) for verification of kilovoltmeters with an automated mode of operation is determined by the need to quickly verify a large volume of primary high-voltage converters and high-voltage measuring instruments (SI) used in automatic high-voltage control systems. The purpose of the work is to familiarize with the current state and the new automated IMS for checking kilovoltmeters. Materials and methods. Method of comparison with exemplary SI. Results. An overview of various verification IMS and software (SW) is given. A modern automated IMS for checking kilovoltmeters is proposed. Conclusions. The review made it possible to single out the advantage over the existing systems of the new IMS for checking kilovoltmeters, which makes it possible to work quickly with high-voltage measuring instruments. more...
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- 2022
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32. Generation of Sinusoidal Alternating Current of Variable Frequency and Intensity for Measuring the Electromagnetic Characteristics of Electric Motors.
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Elek, Patrícia, Szántó, Attila, and Sziki, Gusztáv Áron
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ELECTRIC motors ,ELECTRIC vehicles ,AUTOMOBILE industry ,ELECTROMAGNETIC devices - Abstract
The electric vehicle drive is nowadays considerably widespread in everyday road transport. These vehicles have an important component: the electric motor. The motors are tested using a simulation program for which knowledge of its electromagnetic and dynamic parameters are needed. These data are usually not provided by the manufacturers; therefore, it must be determined experimentally by measurements. For this purpose, at the Faculty of Engineering of the University of Debrecen there is the structure of a complex measuring system in progress. With this system, we can determine the motor parameters required for the simulation for all electric motors used in the automotive industry. In this publication, we will present a method designed to produce one of the characteristic electromagnetic parameters of electric motors; the variable frequency and strength sinusoidal alternating current required to determine the inductance of windings. [ABSTRACT FROM AUTHOR] more...
- Published
- 2022
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33. Automated systems for monitoring and accounting of electric energy consumption in the republic of Uzbekistan
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Khusanboyevich, Rakhmonov Dilmurod
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- 2021
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34. Using of system SurveNIR for identification of plastics in library collection
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Petra Vávrová, J. Neoralová, M. Součková, V. Knotek, N. Šipošová, and D. Novotná
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survenir ,measuring system ,plastic ,polymer ,identification ,modern library collection ,Bibliography. Library science. Information resources - Abstract
The paper describes qualitative methods of modern library collections (produced after the year 1800) survey in The National Library of the Czech Republic in Prague. Each book is primarily composed of paper sheets and bookbinding. In modern library collections bookbinding usually contains parts composed of synthetic materials. Different types of materials have different mechanisms of degradation. Therefore, the main objectives of this work are nondestructive identification of synthetic materials in bookbinding, their degradation processes, and methods of conservation, conditions of storage, and preventive care as well. Based on the preliminary results of the collection survey in the National Library of the Czech Republic, the most usual types of synthetic materials in bookbinding are cellulose nitrate, cellulose acetate, polyethylene, polyurethane, polymethylmethacrylate, and polyvinyl chloride, both of solid and plasticized type. For faster survey of the collections and deeper information is used new instruments for modern library collection survey and preservation – SurveNIR measuring system. SurveNIR measuring system is used for determination of paper properties and identification of plastic materials using chemometric and comparison with material standards. It can identify more than 45 different types of plastics. It is a nondestructive method, very fast, and it is possible to obtain results in a few seconds of measuring. The SurveNIR system was developed in the European project. more...
- Published
- 2021
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35. The Control-and-Measuring System Built-in Automatic Control System by the Technical Casting Process with Piezocrystallization
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Denisov, M., Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Jiming, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Hirche, Sandra, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Liang, Qilian, Series Editor, Martín, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Möller, Sebastian, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zhang, Junjie James, Series Editor, Radionov, Andrey A., editor, and Karandaev, Alexander S., editor more...
- Published
- 2020
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36. Optical-Electronic System for Measuring Spatial Coordinates of an Object by Reference Marks
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Phuong, Hoang Anh, Gorbachev, Alexey A., Konyakhin, Igor A., Minh Hoa, Tong, Kacprzyk, Janusz, Series Editor, Gorodetskiy, Andrey E., editor, and Tarasova, Irina L., editor
- Published
- 2020
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37. Methodology of Experimental Research of Aeroelastic Interaction Between Two-Phase Flow and Deflecting Elements for Modular Separation Devices
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Demianenko, Maryna, Liaposhchenko, Oleksandr, Pavlenko, Ivan, Luscinski, Slawomir, Ivanov, Vitalii, Chaari, Fakher, Series Editor, Haddar, Mohamed, Series Editor, Kwon, Young W., Series Editor, Gherardini, Francesco, Series Editor, Ivanov, Vitalii, Series Editor, Tonkonogyi, Volodymyr, editor, Trojanowska, Justyna, editor, Oborskyi, Gennadii, editor, Edl, Milan, editor, Kuric, Ivan, editor, Pavlenko, Ivan, editor, and Dasic, Predrag, editor more...
- Published
- 2020
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38. An Automated View Planning Method of Robot 3D Measurement
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Yang, Yilin, Zhang, Lin, Wu, Zeping, Zhang, Xu, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Chan, Chee Seng, editor, Liu, Hong, editor, Zhu, Xiangyang, editor, Lim, Chern Hong, editor, Liu, Xinjun, editor, Liu, Lianqing, editor, and Goh, Kam Meng, editor more...
- Published
- 2020
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39. SIMULATION MODEL OF ASSESSMENT OF COMPUTER VISION SYSTEM ACCURACY
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Aleksey V. Zubar, Rustam N. Khamitov, and Kiril V. Kaykov
- Subjects
modeling ,accuracy assessment ,determination of coordinates ,computer vision system ,measuring system ,Engineering geology. Rock mechanics. Soil mechanics. Underground construction ,TA703-712 - Abstract
The relevance of the study is caused by the urgent need to develop a model for assessing the accuracy of determining the spatial position of objects, as well as tracking the position and movement of their boundaries by a computer vision system, which, as part of automated systems, can be used when carrying out various geodetic works, for surveying support of underground construction, 3D reconstruction of the surface landscape land, terrain mapping, when performing work in the mining industry, as well as servicing large and extended objects. It is especially important to use computer vision systems that allow spatial measurements in cases where traditional laser means do not provide high efficiency, for example, due to a high degree of scattering or, conversely, absorption of laser radiation by the surface of the observed object or small angular dimensions. Purpose: assessment of the measurement space geometry and determine the distribution patterns of the measurement accuracy within its boundaries. Problem statement: development of a simulation model that provides reconstruction of the form and dimensions of the measurement space and visualization of the distribution of measurement accuracy of coordinates of objects, taking into account the technical data of the cameras, their relative positions and orientations, as well as the influence on the measuring process of random components arising both during the assembly of the system and during its operation. Methods: mathematical model method. The novelty of the developed model is characterized by the fact that it was the first one to realize the possibility of estimating the distribution of errors in determining coordinates by the technical vision system over the entire depth of its measuring space. When modeling, there are no restrictions on the relative position of the cameras and their obligatory uniformity. For the first time, the model takes into account random errors associated with both the determination of the relative orientation of the position of the cameras, and with inaccuracies in their manufacture, as well as the capabilities of the applied system calibration method. Results. The paper introduces the results of the analysis of models known from the level of science and technology for assessing the accuracy in determining the three-dimensional coordinates of objects by the technical vision system, their disadvantages are shown. The essence and main stages of transformations in the development of the model for assessing the accuracy in determining the coordinates of objects and their distribution over the measuring space by the computer vision system are disclosed. Conclusions. The model based on the set of external and internal parameters of the cameras, as well as taking into account the expected random errors in the assembly and adjustment of the measuring system, makes it possible to estimate the accuracy in determining the coordinates of objects and the geometry of the measuring space. The presented model makes it possible to evaluate the accuracy of determining the spatial coordinates of objects, the position and movement of their boundaries when using computer vision systems as part of geodetic automated measuring systems. In addition, the use of this model makes it possible to optimize the process of formulating technical requirements for video or cameras and their relative position in the course of measurements. more...
- Published
- 2021
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40. Digital Data Processing Methods for Estimating Tractive Force of Tractors
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Vyacheslav F. Fedorenko, Vitaly E. Tarkivskiy, Nikolay P. Mishurov, and Nikolay V. Trubitsyn
- Subjects
tests ,tractive force ,digital filter ,pulse interference ,strain gauge ,measuring system ,Engineering (General). Civil engineering (General) ,TA1-2040 ,Technology (General) ,T1-995 - Abstract
Introduction. When carrying out an energy assessment of agricultural machines and traction tests of tractors, the most important indicator is the value of the tractive effort. The existing methods for determining the tractive effort of tractors imply the use of specialized measuring instruments, such as strain gauges and devices for processing and displaying information. The accuracy of determining the tractive effort is significantly influenced by the physical and mechanical properties of soil. To process the useful signal during the measurement of tractive effort, the data stream of the strain gauge sensor must be subjected to additional digital filtering taking into account the operating conditions of the agricultural unit. Materials and Methods. The functions of changing the tractive effort obtained on the K-744R2 tractor in various gears have been analyzed. An algorithm for digital processing of the signal of a strain gauge force meter based on a median filter has been developed that makes it possible to increase the measurement accuracy. The advantage of the proposed method is the ability to cut off sharp short-term impulse noise and sharp fluctuations in the amplitude of the measured value. Results. A method for determining the amount of tractive effort using median signal processing has been proposed. A device for determining the tractive effort during testing of agricultural tractors and units has been developed. The choice of the main components of the device for determining the magnitude of the tractive effort has been substantiated. As a result of the research, a device for measuring and digital processing of the signal of a force meter based on a microcontroller and specialized software for processing initial data in real time was designed and manufactured. Discussion and Conclusion. The developed method makes it possible to exclude the negative effect of impulse noise arising in the process of measuring the tractive effort of the tractor. The proposed device for measuring the tractive effort of tractors is compatible at the level of the exchange protocol with existing devices, has a high speed of operation in real time, multi-channel operation. more...
- Published
- 2021
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41. Application of the Correlation Velocity Measurements for Hydrodynamic Investigations of Turbulent Coolant Flow in Nuclear Reactor Elements
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I. A. Konovalov, A. E. Khrobostov, M. A. Legchanov, D. N. Solncev, A. A. Barinov, A. V. Ryazanov, A. A. Chesnokov, and M. A. Makarov
- Subjects
measuring system ,correlation flowmeter ,spatial conductometry ,modeling of processes in the elements of nuclear power units ,Engineering (General). Civil engineering (General) ,TA1-2040 - Abstract
The method of correlation measurement of the coolant flow rate, widely used for operational diagnostics of nuclear power plants, can be extensively used in research practice. The aim of this work was to apply a correlation method based on the conductometric measurement system with wire-mesh sensors for measuring a coolant flow rate.Insignificant concentration of a salt solution (NaCl or Na2SO4 ) creates a gradient of the conductivity in the flow, which is used as a passive scalar measured by the system. Authors used turbulent pulsations at the interface of two concurrent flows with identical velocities in a square channel as a signal source for the correlation method. The paper presents the methodology of the tests, test facility description, signalto-noise ratio estimation, the results of digital signal processing and comparison of the measured velocities in the model with the flowrate‒averaged velocity determined by the use of flowmeters. The measured velocity values give acceptable agreement for the turbulent flow modes. It was shown that the measurement accuracy drops sharply for low-Reynolds flows.The obtained results were used for flowrate measurements in core-imitator channels of the nuclear reactor test model. The presented paper is an approbation of this approach for its application as part of an test model of a nuclear reactor in order to determine the each duct flow rates in the channels of the core simulator using wire mesh sensors. more...
- Published
- 2020
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42. Measuring system for comprehensive testing of electrical machines
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Adam Biernat and Włodzimierz Przyborowski
- Subjects
electric machines ,measurements ,measuring system ,Technology - Abstract
The article presents a measuring system designed for a comprehensive experimental testing of various types of electric machines. These tests include measurements of electrical, electromagnetic, kinematic, as well as mechanical and thermal quantities. The basic measurements of electrical machines include currents and voltages in electrical circuits, including voltages on resistive and generally impedance elements of these circuits, and induced voltages. Depending on the machine class and type, the measured values are constant or change over time. Some magnitudes of electromagnetic transformations are measured in the area of machine construction. In addition, the parameters of the measured values of the type of signal discriminants (average, effective and maximum values) and their waveforms are presented. Due to the wide range of machine state parameters, i.e. its state variables - in different load states, the multiplicity of these signals and the need to know their different characteristics, it becomes necessary to use individually adopted signal processing subsystems, i.e. signal acquisition systems, in the measuring systems. It is now possible thanks to the development in the CAM (Computer Aided Measurement) programming, for example using the graphical programming language of the integrated LabVIEW system. The article also presents examples of subsystems for the acquisition of measurements of nonelectromagnetic signals like vibrational and acoustic ones generated in machines. Keywords: electric machines, measurements, measuring system more...
- Published
- 2020
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43. FAUST: MATERIAL CHARACTERIZATION OF LOW-COST FOAM MATERIALS UNDER REAL BOUNDARY PROCESS CONDITIONS FOR RTM LARGE-SCALE PRODUCTION
- Author
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Opitz, Mark, Bertling, Dominic, Liebers, Nico, Open Hybrid LabFactory e.V., Series Editor, Dröder, Klaus, editor, and Vietor, Thomas, editor
- Published
- 2019
- Full Text
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44. Automation of Technological System Diagnostics by Parameters of Quality of Surfaces of Machined Parts
- Author
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Nagorkin, M. N., Fyodorov, V. P., Kovalyova, E. V., Radionov, Andrey A., editor, Kravchenko, Oleg A., editor, Guzeev, Victor I., editor, and Rozhdestvenskiy, Yurij V., editor
- Published
- 2019
- Full Text
- View/download PDF
45. Calibration Scheme of Impulse‐High‐Voltage Measuring System Traceable to National Standards of Japan.
- Author
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Miyazaki, Satoru, Goshima, Hisashi, Shimoyama, Akihiko, Tadokoro, Takuya, Wakimoto, Takayuki, and Ishii, Masaru
- Subjects
- *
ELECTRICITY power meters , *ELECTRICAL engineers , *ELECTRIC equipment , *ELECTRIC testing , *CALIBRATION - Abstract
It is recommended in IEC 60060‐2:2010 that measuring systems employed in high‐voltage impulse tests of electric apparatuses are calibrated directly or indirectly through comparison with a national standard. Japan High‐voltage Impulse testing Laboratory Liaison has attempted to establish a calibration scheme of impulse‐high‐voltage measuring system traceable to national standards in cooperation with Japan Electric Meters Inspection Corporation. In this paper, the calibration of the working‐standard measuring systems employed in the established calibration scheme are introduced. Nextly, uncertainties of the calibration by the established scheme are explained. Finally, the traceability system of the established calibration scheme is presented. © 2021 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC. [ABSTRACT FROM AUTHOR] more...
- Published
- 2021
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46. Reducing the Impact of Influence Factors on the Measurement Results from Single-Coil Eddy Current Sensors
- Author
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Sergey Borovik, Marina Kuteynikova, and Yuriy Sekisov
- Subjects
single-coil eddy current sensor ,measuring system ,powerplant ,state monitoring ,influence factor ,multidimensional displacements ,Chemical technology ,TP1-1185 - Abstract
Single-coil eddy current sensors (SCECS) form a separate and independent branch among the existing eddy current probes. Such sensors are often used for aviation and aerospace applications where the conditions accompanying the measuring process are harsh and even extreme. High temperatures (up to +600 °C in the compressor and over +1000 °C in the turbine of gas turbine engines), the complex shape surfaces of the monitored parts, the multidimensional movement of the power plants’ structural elements, restrictions on the probes number and their placement in the measuring zone are the main factors affecting the reliability and accuracy of the measurement results obtained by the sensors. The article provides an overview of the relevant approaches and methods for reducing the impact of influence factors on the measurement results from SCECS based on the extensive experience of more than 30 years of research and development being carried out in the Institute for the Control of Complex Systems of Russian Academy of Sciences. The scope of the solutions discussed in the article is not limited to SCECS measurement systems only but can also be extended to the systems with primary transducers of other designs or other physical principles. more...
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- 2022
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47. Design of a Measuring System Suitable for Measuring the Electromagnetic and Dynamic Characteristics of Electric Motors.
- Author
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SZÁNTÓ, Attila, DÉCSEI, Roland, KUJBUS, Márton, FEJES, Levente, PAPCSÁK, Nóra, and SZIKI, Gusztáv Áron
- Subjects
ELECTROMAGNETISM ,SIMULATION games ,ELECTRIC motors ,SUPPLY chains ,INDUSTRIAL robots - Published
- 2021
- Full Text
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48. Razvoj sistema za merjenje telesnih asimetrij s pospeškometri.
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Trošt, Andrej, Jamšek, Marko, Šarabon', Nejc, and Babič, Jan
- Subjects
- *
PRACTICE (Sports) , *DATA warehousing , *HUMAN body , *ACQUISITION of data , *MICROCONTROLLERS , *PELVIS - Abstract
In sports, acute and chronic injuries of athletes are common despite the growing knowledge and interest in the preventive activity in the sports practice. One of the main causes of injuries in athletes are their body asymmetries, which can only be dealt with if properly quantified. Despite the availability of several measuring systems, the majority of them do not allow segmental measurements and those that do are not portable. To solve the issue, a portable measuring system to measure the body asymmetries of the lower part of the human body was designed and manufactured. It measures and stores the data acquired by six accelerometers attached at the foot, tibia and pelvis of the human both legs. The system is compact, lightweight, portable and allowing a local data storage on the measuring device itself and triggering external signal to start the data acquisition. The system is driven by a sophisticated microcontroller that ensures data sampling at a high sampling rate. Results of a preliminary experimental system evaluation and validation are positive and encouraging for its further development and enhancement. [ABSTRACT FROM AUTHOR] more...
- Published
- 2021
49. Investigations of the Dynamics of a Four-Element Machine-and-Tractor Aggregate
- Author
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Bulgakov Volodymyr, Ivanovs Semjons, Adamchuk Valerii, and Antoshchenkov Roman
- Subjects
dynamics ,movement ,mathematical mode ,measuring system ,Agriculture (General) ,S1-972 - Abstract
The paper presents a dynamic model of four-element machine-and-tractor designed on the basis of a combined soil-cultivating-sowing aggregate and a tractor with an articulated frame. The pseudo velocity of the first tractor half-frame was considered a generalised coordinate. The control impact upon the tractor was obtained by means of the bending angle of the tractor half-frames. The trajectories and movement speeds of the aggregate elements were calculated as a function of time for the driving mode along a straight-line path and the tractor movement according to the harmonic control law. By means of the measuring system, trajectories of the aggregate elements were obtained. It was established that the movement trajectories of the aggregate elements represent a complex assessment parameter of the mathematical model adequacy of the aggregate plane-parallel movement. There was found a regularity of the aggregate turning radius and the bending angle of the tractor half-frames. more...
- Published
- 2019
- Full Text
- View/download PDF
50. The Influence of Selected External Factors on Temperature of Photovoltaic Modules
- Author
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Bilčík Matúš, Božiková Monika, and Malínek Martin
- Subjects
temperature ,solar radiation ,dependence ,measuring system ,temperature sensor ,Agriculture (General) ,S1-972 - Abstract
The article deals with the impact of selected external factors on the temperature of photovoltaic module surfaces. Primary aim of this research is creation of temperature model for photovoltaic module, which would be usable under the real climatic conditions in Central Europe region. Fully autonomous measuring system was designed and created for temperature monitoring of different parts of photovoltaic modules. The measuring system consists of 24 temperature sensors, voltage inverter, control unit, transfer modules, receiver modules and temperature measuring module. The experiments were performed on photovoltaic modules installed on the roof of the University of Life Sciences in Prague during summer 2018. The temperature of photovoltaic modules significantly depends on the climatic conditions, which were monitored by the weather station. The temperature and the solar radiation dependencies for polycrystalline and monocrystalline photovoltaic modules were obtained in experiments conducted. The temperature relations were measured for different parts of photovoltaic module – active parts of photovoltaic module, frame, non-active parts of photovoltaic module, as well as ambient temperature. Final mathematical description of polynomial graphical dependencies was obtained after application of fitting procedure and regression analysis. more...
- Published
- 2019
- Full Text
- View/download PDF
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