43 results
Search Results
2. [Characteristics of noise in mechanical wood processing shops at cellulose-paper plants].
- Author
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Marinenko NV
- Subjects
- Environmental Exposure, Humans, Maximum Allowable Concentration, USSR, Cellulose, Noise, Occupational Medicine, Paper
- Published
- 1971
3. INCREASING THE ROBUSTNESS OF THE STEGANOGRAPHIC METHOD WITH CODE CONTROL OF THE ADDITIONAL INFORMATION EMBEDDING AGAINST NOISE ATTACKS.
- Author
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Hulid, D. O. and Sokolov, A. V.
- Subjects
- *
ADDITIVE white Gaussian noise , *EMBEDDING theorems , *INFORMATION resources management , *NOISE , *NOISE control - Abstract
The increase in the amount of multimedia content generated, stored and transmitted by modern information systems leads to an increase in the role of the steganographic component in information protection systems. At the same time, significant requirements are put to the applied steganographic methods regarding their effectiveness, which include sufficient bandwidth, ensuring the reliability of perception, and resistance to attacks against the embedded message. The performance of the steganographic methods is of great importance, especially if it is intended to be used in real-time on a resource-constrained platforms. One of the modern steganographic methods, which is characterized by providing the main effectiveness indicators with a small computational complexity due to the execution of steganographic transformation in the space domain of the container, is a steganographic method with code control of additional information embedding. However, despite the rather high indicators of resistance to noise attacks, which can occur in many practical applications, the issue of increasing the resistance of steganographic transformation to these types of attacks remains relevant. The purpose of the paper is to increase the resistance to noise attacks of the steganographic method with code control of additional information embedding. The paper researches attacks against an embedded message with two types of noise: additive white Gaussian noise and "Salt and Pepper" noise. In the paper, experimental research on the effects of the structure of the codeword used on the robustness of the steganographic method with code control against a noise attack by additive white Gaussian noise was performed, which made it possible to develop practical recommendations regarding the parameters of the steganographic method with code control under the conditions of this type of attack. The application of the BAN method (broadband signal, attenuator, narrowband signal) is proposed to increase the resistance of the steganographic method with code control against the "Salt and Pepper" noise attack, which allowed to reduce the number of errors when extracting additional information in conditions of this noise by 48%. The results obtained in this paper can be useful for the application of the steganographic method with code control in practice in the conditions of transmission of a steganographic message over channels characterized by the presence of noise attacks against the embedded message. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
4. РОЗРОБКА СТЕГАНОГРАФІЧНОГО МЕТОДУ ВБУДОВИ БІНАРНОГО ЦИФРОВОГО ВОДЯНОГО ЗНАКУ В ЗОБРАЖЕННЯ НА ОСНОВІ ДИСКРЕТНОГО КОСИНУСНОГО ПЕРЕТВОРЕННЯ
- Author
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Ахмаметьєва, Г. В. and Кирилюк, В. О.
- Subjects
DIGITAL watermarking ,DISCRETE cosine transforms ,DATA mining ,DIGITAL images ,PEPPERS ,NOISE - Abstract
Copyright of Informatics & Mathematical Methods in Simulation / Informatika ta Matematičnì Metodi v Modelûvannì is the property of Odessa Polytechnic University 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.)
- Published
- 2021
- Full Text
- View/download PDF
5. Bibliometric analysis of research relating to noise pollution reported over the period 2001–2020
- Author
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Erhan KAYA, Musa ŞAHIN, and Onur ACAR
- Subjects
noise pollution ,bibliometric ,article ,noise ,pollution ,Medicine ,Science - Abstract
Introduction In the new globalized world, noise pollution has started to become a public health problem. We searched for publications about noise pollution in our study. In our study, we examined the noise pollution articles in the Web of Science (WoS) database. Material and Methods A total of 2722 papers were identified which were published between 2001 and 2020, finally, 1815 articles were analyzed. VOSviewer (version 1.6.11) tool used for bibliometric web visualizations. Results When trend analysis was applied to the number of articles by years, a statistically significant increase was detected. The United States contributed the most publications. The countries with the most articles per million population were determined to be Scotland, Singapore, and Ireland, respectively. Most articles on noise pollution were published in the journal Applied Acoustics. The three most used keywords are “noise pollution”, “noise” and “traffic noise”. Conclusions This study showed that there has been a trend of an increasing number of articles on noise pollution in recent years. Also it can be considered that this bibliometric study will help identify gaps in the current research data.
- Published
- 2024
- Full Text
- View/download PDF
6. The use of a piece sound absorber to reduce the impact of noise on workers in the dairy industry on the example of industrial enterprises of the Republic of Mordovia
- Author
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Alexander N. Skvortsov
- Subjects
working conditions ,noise ,labor protection ,milk processing industry ,sound-absorbing structure ,special assessment of working conditions ,Environmental sciences ,GE1-350 - Abstract
The paper analyzes the working conditions of workers in the dairy industry, which showed that the prevailing harmful production factor is the increased noise level. It has been proven that noise has a negative impact not only on the hearing organs, but also on the whole organism as a whole as a general biological irritant, therefore, reducing noise expansion due to engineering solutions is an urgent task of our time. The article assesses the noise impact on operators of the dairy industry as part of a special assessment of working conditions. The analysis showed that the excess noise level is observed at all workplaces. To protect workers from an increased noise level, a design of a sound-suppressing piece sound absorber is proposed, which is distinguished by high sanitary and hygienic properties. The use of sound-suppressing piece sound absorbers will improve working conditions from a harmful class to an acceptable one.
- Published
- 2023
- Full Text
- View/download PDF
7. [Urgency of comparative spectral analysis of noises in sanitary inspection].
- Author
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Krasovskiĭ VO
- Subjects
- Housing standards, Humans, Loudness Perception, Models, Theoretical, Noise, Transportation adverse effects, Sound Localization, Speech Perception, Vibration, Hygiene standards, Noise adverse effects, Perceptual Masking, Sound Spectrography methods
- Abstract
Spectrum (presentation, an image) is a set of all values of any that characterizes, for example, sound-wave propagation. In exact sciences, the expansion of oscillatory function in terms of harmonics, by calculating the Fourier coefficients denotes a spectral analysis. The paper discusses how to further improve the existing sanitary document regulating the order of noise measurement in the area of an apartment block and in residential and public buildings. The author proposes to supplement the document with a procedure for the comparative analysis of the spectral contents of noises.
- Published
- 2012
8. [Risk for environment-induced diseases due to air pollution from motor vehicles in road-patrol officers].
- Author
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Mikhaĭlichenko KIu, Kas'ianenko AA, Shchelkunova IG, and Grechko AV
- Subjects
- Humans, Moscow, Risk Assessment, Air Pollutants chemistry, Air Pollution adverse effects, Carcinogens, Environmental adverse effects, Noise adverse effects, Occupational Diseases chemically induced, Occupations, Vehicle Emissions
- Abstract
The paper describes risk factors for environment-induced diseases in road-patrol (RP) officers under the existing working conditions: noise and chemical ambient air pollution from motor vehicles. There is evidence for a significant increase in the incidence of diseases of the cardiovascular and nervous system, sense organs, digestive and endocrine metabolic systems in the State Road Safety Inspectorate officers who are directly engaged in traffic management. Potential and real risks from motor transport to the health of RP roads have been estimated. Recommendations on optimizing the working conditions are given.
- Published
- 2010
9. [Contribution of physical factors to the complex anthropogenic load in an industrial town].
- Author
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Dunaev VN, Bystrykh VV, and Boev VM
- Subjects
- Adult, Cardiovascular Diseases etiology, Cities, Congenital Abnormalities etiology, Data Interpretation, Statistical, Digestive System Diseases etiology, Female, Humans, Industry, Infant, Newborn, Male, Nervous System Diseases etiology, Noise, Transportation adverse effects, Pregnancy, Pregnancy Complications etiology, Electromagnetic Fields adverse effects, Noise adverse effects
- Abstract
The paper provides evidence for the increasing significance of noise and electromagnetic fields. The correlation coefficients between urban noise and the incidence of digestive diseases were found to be 0.84, those between noise and complication pregnancy were 0.83, those between noise perinatal pathology was 0.79, those between electromagnetic exposure (EME) and neuropsychopathy, EME and cataract, and EME and circulatory disorders were 0.71, 0.91, and 0.78, respectively.
- Published
- 1998
10. Scientific and Practical Approaches to Improving Noise Muffler Designs of Piston Internal Combustion Engines Based on Theory of Numbers
- Author
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V. Ya. Grudanov, G. I. Belokhvostov, and L. T. Tkacheva
- Subjects
Muffler ,Technology ,Fibonacci number ,Series (mathematics) ,preferred numbers ,perforated partition ,General Medicine ,law.invention ,Geometric progression ,exhaust gases ,Noise ,series of preferred numbers ,Number theory ,Geometric group theory ,law ,internal combustion engine ,Applied mathematics ,Golden ratio ,innovative model of noise muffler ,noise muffler ,golden ratio ,Mathematics - Abstract
A methodological method based on the use of the theory of preferred numbers has been proposed in order to improve the most important parameters of the working bodies of noise mufflers. As a result of many years of scientific research, the authors have established a previously unknown theoretical relationship between the main series of preferred numbers, golden ratio and Fibonacci series numbers. A new direction in the development of number theory has been considered in the paper, its classification has been compiled, including the geometric theory of numbers, preferred numbers, containing a new basic series of preferred numbers using the Fibonacci sequence. New formulas have been obtained to determine the denominators of geometric progressions for the series of preferred numbers and the area of a circle. Determining the area of a circle using the new formula allows to get more accurate values. A new formula for determining the circumference of a circle has also been derived. The designs of perforated partitions have been developed, in which the laws of the new basic series of preferred numbers are used. Determining the area of a circle using the new formula allows you to get more accurate values. A new formula for determining the circumference of a circle is also obtained. The designs of perforated partitions have been developed, in which the regularities of the new basic series of preferred numbers have been used. A calculated substantiation of the main geometric and structural dimensions of noise mufflers is given using a mathematical model of a perforated golden partition and new basic series of preferred numbers, which allow to obtain a noise muffler design that has the lowest possible aerodynamic resistance with the maximum possible reduction in the noise level of exhaust gases from internal combustion engines. An innovative model of a noise muffler for reciprocating internal combustion engines with improved hydraulic and acoustic characteristics based on the theory of numbers is proposed in the paper. The theory of preferred numbers applies to any technical device.
- Published
- 2021
11. RESULTS AND PERSPECTIVES OF STUDYING THE OCCUPATIONAL DISEASES IN WORKERS OF AIRCRAFT INDUSTRY IN EAST SIBERIA
- Author
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V. S. Rukavishnikov, V. A. Pankov, M. V. Kuleshova, D. V. Rusanova, N. V. Kartapoltseva, N. G. Sudakova, E. V. Katamanova, G. M. Bodienkova, A. V. Lizarev, V. V. Kozhevnikov, T. L. Vershinina, and S. A. Potylitsina
- Subjects
employees of aircraft industry ,local vibration ,noise ,vibration-induced disease ,neurosensoric dullness of hearing ,experimental studies ,Science - Abstract
The materials of the long-studies among the employees working in the aircraft industry, of both the patients with occupational diseases and the practically healthy persons are discussed in the paper. Using the method of the biological feedback for the vibration-induced disease prevention has been grounded. The preliminary results of the experimental studies using the animals are presented in this paper.
- Published
- 2012
12. EVALUATION OF ELECTROMYOGRAPHIC NOISE STATISTICAL CHARACTERISTICS IN MULTICHANNEL ECG RECORDINGS
- Author
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Evgene B. Grigoriev, Evgeny M. Nifontov, and Alexander S. Krasichkov
- Subjects
correlated noise ,TK7800-8360 ,Computer science ,Acoustics ,0206 medical engineering ,02 engineering and technology ,ecg signal ,electromyographic noise ,020601 biomedical engineering ,Noise ,long-term ecg monitoring ,cardiovascular diseases ,Electronics ,correlation coefficient - Abstract
Electromyographic noise is one of the most common noises in electrocardiogram. In case of several electrocardiogram leads, electromyographic noise affects each lead to different extent. It can be taken into account when developing algorithms for multilead electrocardiogram record processing. However, in the existing literature, there is no information about the relationship of electromyographic noise in various ECG leads and their joint probability distribution. The purpose of this paper is to study statistical characteristics of electromyographic noise in ECG signal, from which the electromyographic noise is extracted. The paper proposes a method for extracting electromyographic noise from electrocardiogram signal, based on a polynomial approximation of electrocardiogram signal fragments in sliding window with overlapping fragment subsequent weight averaging. Using this method, fragments of electromyographic noise are extracted from multichannel electrocardiogram records. Based on the obtained data, a joint probability distribution function of electromyographic noise in two adjacent leads is selected, and the correlation relationships between the electromyographic noise in various ECG leads are investigated. The results show that the joint probability distribution function of electromyographic noise in two adjacent leads in the first approximation can be described using bivariate normal distribution. In addition, between the samples of electromyographic noise from two adjacent leads quite strong correlation relationships can be observed.
- Published
- 2018
13. Influence of noise on generalized synchronization in systems with a complex topology of attractor
- Author
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Moskalenko, Olga Igorevna and Hanadeev, Vladislav Andreevich
- Subjects
generalized synchronization ,auxiliary system approach ,calculation of the spectrum of lyapunov exponents ,noise ,complex topology of attractor ,Physics ,QC1-999 - Abstract
Background and Objectives: The goal of the paper is to study the influence of noise on generalized synchronization in unidirectionally coupled systems with a complex topology of attractor. As the systems under study, two models of chaotic systems with two-sheeted topologies of attractors such as Lorenz and Chen systems are considered. Materials and Methods: For the synchronous regime detection the method of calculating the spectrum of Lyapunov exponents for coupled systems and the auxiliary system approach are used. Results: It has been shown that the dependences of the threshold for the onset of the generalized synchronization regime on the noise intensity do not practically change both for Lorenz and Chen systems. Conclusion: Using the examples of Lorenz oscillators and Chen systems we have found that the generalized synchronization regime in systems with a complex topology of attractor is stable to external noise. This behavior of systems is determined by the weak influence of noise on the structure of attractors of interacting systems, which is confirmed by constructing their phase portraits for different values of the noise intensity
- Published
- 2021
- Full Text
- View/download PDF
14. [The physiological role and significance of prostaglandins in the reaction of the body to unfavorable environmental factors].
- Author
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Petrova TV and Bobrovnitskiĭ IP
- Subjects
- Animals, Humans, Radiation, Nonionizing, Rats, Adaptation, Physiological, Aerospace Medicine, Homeostasis, Noise, Prostaglandins physiology, Vibration
- Abstract
This review discusses the use of parameters of prostaglandin metabolism as criteria of human body resistance to adverse environmental effects. The paper presents observations indicating involvement of prostaglandins in responses to stress, hypoxia and ischemia. It is shown that the primary response to such effects as ionizing radiation, microwave radiation, noise, vibration, exercise, microgravity is usually characterized by increases in the concentration of most prostaglandins in organs and tissues. Development of extreme states and diseases leads to dysbalance of major prostaglandins. Knowledge of the changes involved may help improve diagnostic approaches and reliable use of prostaglandin-based drugs, their activators and inhibitors for therapeutic purposes.
- Published
- 1988
15. [Clinical aspects of occupational pathology caused by noise and vibration].
- Author
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Tarasova LA, Ostapkovich VE, Komleva LM, and Lagutina GN
- Subjects
- Humans, Occupational Diseases diagnosis, Occupational Diseases prevention & control, Noise adverse effects, Noise, Occupational adverse effects, Occupational Diseases etiology, Vibration adverse effects
- Abstract
The paper is concerned with the results of many year-old clinical studies on workers of vibration-risk and "noisy" professions. The authors consider occupational and biomedical risk factors contributing to the development of vibratory disorders and noisy cochlear neuritis, the main clinical syndromes of this occupational pathology, modern methods of their preclinical and early clinical diagnosis. The basic principles of differentiated follow-up and combined prevention as well as problems of therapy, medical labor examination and rehabilitation of patients with vibratory disease and occupational cochlear neuritis are described.
- Published
- 1988
16. [Sonic booms--new environmental factor (bases for standardization)].
- Author
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Iuganov EM, Krylov IuV, and Kuznetsov VS
- Subjects
- Humans, Aircraft, Noise adverse effects, Vibration adverse effects
- Abstract
The paper discusses physical, psychophysiological and social aspects of a new type of sound effects--sonic shocks of supersonic vehicles. An up-to-date approach to the standardization of environmental effects should include a study of human physiological responses, comparison of the results of psychophysiological scaling with the available standards and prediction based on sociological questionnaires. This kind of standardization is illustrated.
- Published
- 1976
17. EXPERIMENTAL INVESTIGATION OF RAILWAY ROLLING STOCK NOISES LEVELS.
- Author
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Popovs, Valentins, Balckars, Peteris, Baranovskis, Andrejs, and Iljina, Ludmila
- Subjects
- *
RAILROADS , *NOISE , *PREDICTION models , *RAILROAD stations , *MATHEMATICAL models - Abstract
In this paper the research results of English CRN railway noise propagation prediction model applicability possibilities in the conditions of Latvian railway are described. Experimental measurements of railway noise levels from different types of trains were done in the area or railway station Dole and were compared with the CRN model numerical calculation results. Relatively small difference between the experimentally and numerically gotten results proves the reasonability of investigation of the currently developed mathematical CRN model for railway noise propagation applicability possibilities in the conditions of Latvian railway. [ABSTRACT FROM AUTHOR]
- Published
- 2009
18. RAILWAY ROLLING STOCK NOISE CRN MATHEMATICAL MODEL.
- Author
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Popovs, Valentins, Balckars, Peteris, and Baranovskis, Andrejs
- Subjects
- *
MATHEMATICAL models , *ROLLING stock , *NOISE , *WAGONS , *SPEED of railroad trains - Abstract
In this paper the English national mathematical model for railway rolling stock noise propagation prediction is described. CRN mathematical model distinguishes with the ease of numerical calculation implementation. The basis for numerical calculation is the information about noise level, which is being produced by one wagon. Knowledge of the noise level, which is being produced by one wagon, gives the possibility to calculate the noise level, which is being produced by a rolling stock, consisting of N identical wagons. Various important parameters are taken into account during calculation, such as: wagon type, number of wagons in the rolling stock and the rolling stock movement speed, as well many correction coefficients. The final calculation result is the A weighted equivalent noise level value for the certain track segment and for the day's or night's period of time. As the model's imperfection it is needed to note the following: noise frequency characteristics, variety of wagon types in the rolling stock and weather conditions are not taken into account. Applicability of the given model is limited to the conditions of normal movement of trains on a railroad tracks, i.e. presence of such phenomena as a roughness of a railroad track, squeal of wheel pairs, flanging can raise the SEL level for up to 20 dBA. [ABSTRACT FROM AUTHOR]
- Published
- 2009
19. Evaluation of the depressive state of mobile technical systems operator subjected to electromagnetic noise radiation
- Author
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A. V. Sidorenko and M. A. Saladukha
- Subjects
radiation ,noise ,electroencephalogram ,depression ,human ,Electronics ,TK7800-8360 - Abstract
This paper presents the results of the work aimed at a study of the patterns of changes in the nonlinear electroencephalogram (EEG) parameters, including fractal dimension and self-similarity exponent, when the operator is irradiated with electromagnetic noise radiation. Together with the above-mentioned nonlinear parameters, a change in the spectral power density of the rhythmic components in EEG (delta-, theta-, alpha-, and beta-rhythms) has been studied. Investigation of the fractal dimension, self-similarity exponent, and spectral power density during irradiation was associated with possible changes of the parameters in the case of operator’s depression or minor depression. The radiation source was represented by a transistor electromagnetic-noise generator with the power of 30 mW operating over the frequency range of 5 GHz. The methods for calculation of the nonlinear parameters including fractal dimension and self-similarity exponent have been described. To realize the principal objectives of the work, the Java-based software was developed. The relevant literature demonstrating the changes in fractal dimension, self-similarity exponent, spectral power density of the delta-, theta-, alpha-, beta-rhythms in the case of depression and minor depression has been reviewed. Electroencephalograms were registered according to the “10/20” scheme using the MBN Neurocartograph electroencephalograph. The analyzed leads were Fp1, Fp2, T3, T4, P3, P4, O1, O2, F3, F4, C3, C4. As shown by the results of this work, there is no distinct depressive state of the operator exposed to electromagnetic noise radiation, judging by changes in the self-similarity exponent, fractal dimension, and spectral power density. However, when the operator was irradiated with electromagnetic noise radiation, the observed tendency in variation of the parameters was characteristic for minor depression.
- Published
- 2020
- Full Text
- View/download PDF
20. THE RATIONALE FOR THE FREQUENCY OF MAINTENANCE STEERING GEAR FOR MITSUBISHI PAJERO SPORT II
- Author
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D.N. Proshin, A.N. Kuzmin, and A.D. Kustikov
- Subjects
steering gear ,steering rack ,noise ,defect ,clearance ,maintenance service ,Economics as a science ,HB71-74 - Abstract
During the operation of the vehicle in the steering mechanism, noise may occur, perceived by the owners as defects. Studies have shown that noise does not always indicate a defect in the steering mechanism. Defects should be recognized gaps exceeding the permissible values in the gear engagement and between the stop and the rail. Measuring the gap between the stop and the rail, as well as the torque when the drive gear shaft rotates, is a time-consuming and expensive process, which in the absence of a defect leads to significant costs for the car owner. In order to reduce the cost of finding defects, it is proposed to measure the noise level in the steering mechanism using noise meters. It is established that in the presence of a gap in the interface of the rail and the stop value from 100 µm to 130 µm, the noise level takes values from 70 dBA to 80 dBA. Thus, the decision on the need to measure the gaps in the steering mechanism should be taken on the basis of the testimony of sound level meters obtained during the test trip with connected microphones. A list of the technical maintenance does not work on control gaps in the gear teeth and between the stop and the rail. At the same time, studies conducted in the actual operation of 15 cars indicate that 13 (87%) steering mechanisms in the interface of the stop-rail to 120 000 km appeared gap. One way to improve durability is to adjust the list of TOS. In this paper, the introduction of mandatory measurement of the noise level in the steering mechanism is proposed and its optimal frequency is calculated. The data obtained will allow the service consultant to accurately calculate the cost of repair work for communication to the owner and plan the work of mechanics. This study also has a practical application in the conduct of technical examinations by independent organizations.
- Published
- 2019
- Full Text
- View/download PDF
21. The Huber’s Method-based Gas Concentration Reconstruction in Multicomponent Gas Mixtures from Multispectral Laser Measurements under Noise Overshoot Conditions
- Author
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V Nazarov, Larisa Eremenko, Viktor Gorodnichev, and M. L. Belov
- Subjects
многокомпонентная газовая смесь ,Materials science ,lcsh:Computer engineering. Computer hardware ,business.industry ,Multispectral image ,lcsh:TK7885-7895 ,General Medicine ,Gas concentration ,Laser ,law.invention ,Noise ,Optics ,количественный лазерный газоанализ ,law ,Overshoot (microwave communication) ,метод Хьюбера ,business ,lcsh:Mechanics of engineering. Applied mechanics ,lcsh:TA349-359 - Abstract
Laser gas analysers are the most promising for the rapid quantitative analysis of gaseous air pollution. A laser gas analysis problem is that there are instable results in reconstruction of gas mixture components concentration under real noise in the recorded laser signal. This necessitates using the special processing algorithms. When reconstructing the quantitative composition of multi-component gas mixtures from the multispectral laser measurements are efficiently used methods such as Tikhonov regularization, quasi-solution search, and finding of Bayesian estimators. These methods enable using the single measurement results to determine the quantitative composition of gas mixtures under measurement noise. In remote sensing the stationary gas formations or in laboratory analysis of the previously selected (when the gas mixture is stationary) air samples the reconstruction procedures under measurement noise of gas concentrations in multicomponent mixtures can be much simpler. The paper considers a problem of multispectral laser analysis of stationary gas mixtures for which it is possible to conduct a series of measurements. With noise overshoots in the recorded laser signal (and, consequently, overshoots of gas concentrations determined by a single measurement) must be used stable (robust) estimation techniques for substantial reducing an impact of the overshoots on the estimate of required parameters. The paper proposes the Huber method to determine gas concentrations in multicomponent mixtures under signal overshoot. To estimate the value of Huber parameter and the efficiency of Huber's method to find the stable estimates of gas concentrations in multicomponent stationary mixtures from the laser measurements the mathematical modelling was conducted. Science & Education of the Bauman MSTU 108 The mathematical modelling results show that despite the considerable difference among the errors of the mixture gas components themselves a character of the error dependence on the Huber parameter for all gas components is the same. When an optimal Huber parameter (~ 0.00025 - 0.000025 in case of the specific mixture used in mathematical modelling) is selected the measurement errors of concentrations for all gas components are much smaller than the measurement errors when using the standard method of least squares
- Published
- 2016
22. СИСТЕМЫ ЭНЕРГООБЕСПЕЧЕНИЯ С АЛЬТЕРНАТИВНЫМИ ИСТОЧНИКАМИ ЭНЕРГИИ: БЕЗОПАСНОСТЬ ФУНКЦИОНИРОВАНИЯ АКУСТИЧЕСКИХ ИСТОЧНИКОВ
- Author
-
Сокол, Г. И., Накашидзе, Л. В., and Кириченко, С. Ю.
- Abstract
Copyright of Renewable Energy / Vidnovluvana Energetyka is the property of Institute of Renewable Energy of NAS of Ukraine 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.)
- Published
- 2019
- Full Text
- View/download PDF
23. Minimization of Vibroacoustic Effects as a Criterion for Operation of Gear Transmissions in Accordance with Sustainable Development Principles
- Author
-
Wieczorek Andrzej N. and Kruk Radosław
- Subjects
vibrations ,noise ,design ,gearboxes ,Production management. Operations management ,TS155-194 - Abstract
In correctly functioning maintenance systems it is most important to prevent possible failures. A reduction of the vibroacoustic effects accompanying the operation of machines and equipment, including transmissions, is among the factors that lower the probability of a failure. The paper presents the results of the research on the impact of operational factors on vibroacoustic conditions of transmissions. The factors covered by the analysis included a change in the mating conditions of gear wheels associated with the wear of tooth surfaces, operation of transmissions in subharmonic conditions of the main resonance and the temperature of the lubricating oil. The study demonstrated that it was possible to reduce the vibroacoustic effects generated by gear transmissions by changing the conditions of their operation. Based on the results obtained, it has been found that the operation of gear transmissions in accordance with the sustainable development principles requires technical services to take active measures consisting in the search for optimal operating conditions in terms of the vibroacoustic conditions.
- Published
- 2016
- Full Text
- View/download PDF
24. MINIMIZATION OF VIBROACOUSTIC EFFECTS AS A CRITERION FOR OPERATION OF GEAR TRANSMISSIONS IN ACCORDANCE WITH SUSTAINABLE DEVELOPMENT PRINCIPLES
- Author
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Andrzej N. WIECZOREK and Radosław KRUK
- Subjects
vibrations ,noise ,design ,gearboxes ,Production management. Operations management ,TS155-194 - Abstract
In correctly functioning maintenance systems it is most important to prevent possible failures. A reduction of the vibroacoustic effects accompanying the operation of machines and equipment, including transmissions, is among the factors that lower the probability of a failure. The paper presents the results of the research on the impact of operational factors on vibroacoustic conditions of transmissions. The factors covered by the analysis included a change in the mating conditions of gear wheels associated with the wear of tooth surfaces, operation of transmissions in subharmonic conditions of the main resonance and the temperature of the lubricating oil. The study demonstrated that it was possible to reduce the vibroacoustic effects generated by gear transmissions by changing the conditions of their operation. Based on the results obtained, it has been found that the operation of gear transmissions in accordance with the sustainable development principles requires technical services to take active measures consisting in the search for optimal operating conditions in terms of the vibroacoustic conditions.
- Published
- 2016
- Full Text
- View/download PDF
25. DETERMINATION OF COORDINATES OF SEISMIC WAVE SOURCE BY AMPLITUDE METHOD OF PASSIVE LOCATION
- Author
-
Vasily D. Syten’ky
- Subjects
seismic wave source ,passive location ,radial basic method ,noise ,mean square deviation ,Science - Abstract
The paper presents results of the mathematical synthesis of the method of passive location of a seismic wave source. The method employs measurements of regular attenuation of seismic oscillation amplitudes. If it is impossible to determine the location of a seismic event by means of direct measurements, indirect measurements are needed. A priori information for the mathematical synthesis was obtained from functional equations showing inverse proportions of measured amplitudes, arbitrary effective attenuation coefficients and corresponding coordinates. An original method was applied to process the data. The method providing for passive location of seismic waves sources has been developed; it is called the radial basic method. In the one-dimensional case, a distance is determined on the basis of seismic oscillation amplitudes measured by two seismographs that are located at a known base distance coinciding with the direction to the source of seismic waves. The distance is calculated from the receiver that is nearest to the source. If the base distance and the direct line between the seismograph and the seismic wave source do not coincide, a projection of the distance between the receivers to the given straight line is taken into account.Three seismographs were placed at mutually perpendicular base distances in a plane (i.e. the two-dimensional space). This allowed us to obtain an analytical equation for determining the direction to the seismic wave source using measured amplitudes. The value of the angle is taken into account when calculating the distance.For the seismic wave source located in the three-dimensional space, transition equations for combined coordinate systems (i.e. the Descartes (Cartesian)), at the axes of which the seismographs were placed, and the spherical coordinate systems were applied, and analytical equations were obtained for determination of coordinates, such as distance/polar radius, elevation angle/latitude, and bearing angle/longitude.To analyze the application of the radial basic method of passive location, an absolute error resulting from indirect measurement was calculated. This method is a special case of determining the statistical characteristics of the sought function (coordinates) out of random values, which are the measured amplitudes of seismic oscillations. In the obtained analytical expressions for determination of the mean square deviation of the distance and direction to the seismic wave source, noise from seismographs is taken into account, as well as external noise manifested as microseisms and other interfering seismic waves. For the three-dimensional space, equations are derived for calculation of RMS distance, elevation and bearing angles.In cases where distances to seismic wave sources, directions, coefficients that factor properties of the medium, and base distances are known, the radial basic method allows us to determine effective coefficients of seismic wave attenuation and capacities of seismic wave sources.
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- 2015
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26. NOISE IN THE INDUSTRY – THREAT FOR HEALTH
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Alin IRIMIA, George Artur GĂMAN, Sorin SIMION, Angela CĂLĂMAR, and Daniel PUPĂZAN
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health ,hearing loss ,noise ,noise pollution ,occupational noxious ,safety ,Production management. Operations management ,TS155-194 - Abstract
The success of certain industrial activities bring both benefits and negative effects such as pollution, occupational diseas-es, exposure of workers and residents of neighboring areas and high risk in case of technological failure. An undesirable effect of industrial activity which may be considered a threat to workers and residents in the immediate vicinity of industrial sites is the noise. Due to the presence of technology in all activities, is a major problem considering its nature and harmful repercussions on health. Hearing loss and deafness caused by occupational exposure to noise at work are the most common occupational diseases that occur in the European Union. The development of modern technology by increasing the power and speed of the technical equipment, contributed to diversify and increase the number of sources of noise and vibration, and thus to increase the number of people exposed. This paper analyzes the effect of noise from industrial equipment and health risks.
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- 2015
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27. DESIGNING MACHINERY AND EQUIPMENT IN ACCORDANCE WITH THE PRINCIPLE OF SUSTAINABLE DEVELOPMENT
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Andrzej N. WIECZOREK
- Subjects
design ,noise ,gearboxes ,Production management. Operations management ,TS155-194 - Abstract
The paper presents a designing scheme based on the main criterion of optimisation, which is to minimize the vibrations and noise generated by machinery. This concept takes into account the deterioration of the strength and operational properties of constructions, which should be brought to a satisfactory level by applying additional measures. The consid-ered design approach was examined on the example of the gearboxes, for which it is extremely difficult to achieve a noise reduction due to their highly advanced technology.
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- 2015
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28. Dynamic Characteristics of a Biharmonic Self-Oscillator
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N. N. Udalov, D. A. Frolov, V. A. Sotskov, and Ansar R. Safin
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Physics ,dynamic processes ,TK7800-8360 ,Oscillation ,biharmonic self-oscillator ,Phase synchronization ,phase noise ,Synchronization (alternating current) ,Noise ,phase space ,Control theory ,Phase space ,Phase noise ,Biharmonic equation ,Colpitts oscillator ,Electronics - Abstract
Introduction. Modern methods of stabilizing a frequency of self-oscillations use an improvement of the stability of reactive parameters of the self-oscillators circuit and an increase in the quality factor of an oscillating system. It is also possible to improve the frequency stabilization based on the phenomenon of mutual synchronization of the self-oscillator modes using a multi-loop oscillation system. Previously, a method for reducing a phase noise of an auto-oscillator with synchronization of two modes in a biharmonic auto-oscillator with multiple frequencies was described. The method was developed under the assumption that an active element is inertialess. The idea of the method of synchronizing of the main oscillation with its 2-nd harmonic using an additional loop is based on the consideration that internal fluctuation processes in the active element modulate in-phase all current har-monics. Therefore, it is possible to use this "natural" cross-correlation of noise processes to neutralize their influence. Aim. Building and analysis of a mathematical model of a biharmonic oscillator in order to analyze the operating modes of such generator and reduction of the phase noise of its output oscillation. Materials and methods. The mathematical model was developed by the method of slowly changing amplitudes, and the analysis was performed by methods of numerical integration and differentiation. Results. It was demonstrated that synchronization of two oscillations at multiple frequencies in the active element reduced the phase noise of the main oscillation. Conclusion. In the paper dynamic modes of a biharmonic Colpitts oscillator operating in the phase synchronization mode of two waves were analyzed. It was shown that with an increase in an inertia of the active element, the synchronous mode was preserved. Shortened differential equations of the system for slowly changing amplitudes and phases of oscillatory modes were obtained. The study of nonlinear dynamics and of stationary synchronous mode of the system was carried out by the method of phase space in coordinates of "mode amplitude – phase difference". The conducted field experiment allows one to conclude that it is possible to reduce the phase noise in a stationary synchronous biharmonic mode. It can be used in the frequency stabilization task.
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- 2020
29. Project of steam silencers for cooling of steam boilers of Vyborg CHPP-17
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noise ,звÑкоизолÑÑÐ¸Ñ ,ÑÑÐ¾Ð²ÐµÐ½Ñ Ð·Ð²Ñкового Ð´Ð°Ð²Ð»ÐµÐ½Ð¸Ñ ,ÑÑм ,ÑÑмоглÑÑиÑÐµÐ»Ñ ,silencer ,sound ,steam reset ,sound pressure level ,thermal power plant ,soundproofing ,звÑк ,frequence ,ÑаÑÑоÑа ,паÑовой ÑбÑÐ¾Ñ ,ТÐЦ - Abstract
Тема вÑпÑÑкной квалиÑикаÑионной ÑабоÑÑ: «ÐÑÐ¾ÐµÐºÑ Ð¿Ð°ÑовÑÑ ÑÑмоглÑÑиÑелей Ð´Ð»Ñ ÑаÑÑ Ð¾Ð»Ð°Ð¶Ð¸Ð²Ð°Ð½Ð¸Ñ Ð¿Ð°ÑовÑÑ ÐºÐ¾Ñлов ÐÑбоÑгÑкой ТÐЦ-17». ÐбÑекÑом иÑÑÐ»ÐµÐ´Ð¾Ð²Ð°Ð½Ð¸Ñ ÑвлÑеÑÑÑ ÐÑбоÑгÑÐºÐ°Ñ Ð¢ÐЦ (ТÐЦ-17) Ñилиала «ÐевÑкий» ÐÐР«ТÐÐ-1». Ð ÑабоÑе ÑаÑÑмоÑÑена пÑоблемаÑика ÑÑмового воздейÑÑÐ²Ð¸Ñ Ð¿Ð°ÑовÑÑ ÑбÑоÑов из коÑлов ÐÑбоÑгÑкой ТÐЦ на близлежаÑий ÑелиÑебнÑй Ñайон. ÐÐ»Ñ Ð¿ÑедоÑвÑаÑÐµÐ½Ð¸Ñ Ð¿ÑевÑÑÐµÐ½Ð¸Ñ ÑÑÐ¾Ð²Ð½Ñ ÑÑма пÑедлагаеÑÑÑ ÑÑÑановка ÑÑÑекÑивнÑÑ ÑÑмоглÑÑиÑелей Ð´Ð»Ñ Ð´Ð¾ÑÑÐ¸Ð¶ÐµÐ½Ð¸Ñ ÑелевÑÑ Ñ Ð°ÑакÑеÑиÑÑик ÑÑÐ¾Ð²Ð½Ñ ÑÑма. ЦелÑÑ Ð¸ÑÑÐ»ÐµÐ´Ð¾Ð²Ð°Ð½Ð¸Ñ ÑвлÑеÑÑÑ Ð¾Ð¿Ñеделение ÑÑÐ¾Ð²Ð½Ñ ÑÑма паÑового ÑбÑоÑа и ÑазÑабоÑка ÑÑмоглÑÑиÑелей по ÑÐ½Ð¸Ð¶ÐµÐ½Ð¸Ñ ÑÑÐ¾Ð²Ð½Ñ ÑÑма. Ð Ñ Ð¾Ð´Ðµ ÑабоÑÑ Ð¿Ñоведен анализ заÑÑÑойки близлежаÑего Ñайона, поÑÑÑоена каÑÑа меÑÑноÑÑи ТÐЦ в ÑадиÑÑе 2 киломеÑÑов Ñ Ð¾Ð±Ð¾Ð·Ð½Ð°ÑениÑми ÑÑовней звÑкового Ð´Ð°Ð²Ð»ÐµÐ½Ð¸Ñ Ð½Ð° ÑазнÑÑ ÑаÑÑÑоÑниÑÑ Ð¾Ñ ÑпиÑенÑÑа ÑбÑоÑа паÑа. ÐÑÐ¾Ð¸Ð·Ð²ÐµÐ´ÐµÐ½Ñ ÑаÑÑеÑÑ Ñелевого знаÑÐµÐ½Ð¸Ñ Ð·Ð²Ñкового Ð´Ð°Ð²Ð»ÐµÐ½Ð¸Ñ Ð¸ ÑелевÑе знаÑÐµÐ½Ð¸Ñ ÑÑÑекÑивноÑÑи ÑÑмоглÑÑиÑелей. Ð ÑезÑлÑÑаÑе, иÑÑ Ð¾Ð´Ñ Ð¸Ð· ÑелевÑÑ Ñ Ð°ÑакÑеÑиÑÑик, бÑли вÑбÑÐ°Ð½Ñ ÑÑмоглÑÑиÑели конÑÑÑÑкÑии «ÐаÑнаÑлÑÑкого коÑелÑного завода» и ÑаÑÑÑиÑÐ°Ð½Ñ ÑÑовни звÑкового Ð´Ð°Ð²Ð»ÐµÐ½Ð¸Ñ Ð¿Ð¾Ñле внедÑениÑ, пÑÐ¸Ð²ÐµÐ´ÐµÐ½Ñ ÑкÑÑпнÑннÑе ÑкономиÑеÑкие ÑаÑÑеÑÑ ÑÑоимоÑÑи внедÑÐµÐ½Ð¸Ñ ÑÑмоглÑÑиÑелей. РекомендÑеÑÑÑ Ð¿Ñи внедÑении ÑÑеÑÑÑ Ð¼Ð°ÑÑÑ ÑÑмоглÑÑиÑелей и пÑеделÑнÑÑ Ð½Ð°Ð³ÑÑзкÑ, коÑоÑÑÑ Ð¼Ð¾Ð³ÑÑ Ð²ÑдеÑжаÑÑ Ð¾Ð¿Ð¾ÑнÑе конÑÑÑÑкÑии кÑÑÑи ÑÐµÑ Ð°., The theme of the final qualifying work: "Project of steam silencers for cooling down steam boilers at Vyborg CHPP-17". The object of the study is the Vyborg CHPP (CHP-17) of the Nevsky branch of PJSC TGC-1. The paper considers the problem of the noise impact of steam discharges from the boilers of the Vyborgskaya CHPP on the nearby residential area. To prevent the noise level from being exceeded, it is proposed to install an efficient silencer to achieve the target noise level characteristics. The aim of the study is to determine the noise level of the steam discharge and to develop silencers to reduce the noise level. In the course of the work, an analysis of the development of the nearby area was carried out, a map of the CHPP area was built within a radius of 2 kilometers with designations of sound pressure levels at different distances from the steam discharge epicenter. Calculations of the target value of sound pressure and target values of the efficiency of noise suppressors were made. As a result, based on the target characteristics, noise suppressors designed by the Barnaul Boiler Plant were selected and the sound pressure levels after implementation were calculated, enlarged economic calculations of the cost of introducing noise suppressors were given. It is recommended that when implementing, consider the mass of silencers and the maximum load that the supporting structures of the roof of the workshop can withstand.
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- 2022
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30. КАРТОГРАФИРОВАНИЕ И АНАЛИЗ ШУМОВОГО ЗАГРЯЗНЕНИЯ МИКРОРАЙОНОВ ГОРОДА КРАСНОДАРА С ИСПОЛЬЗОВАНИЕМ ГЕОИНФОРМАЦИОННЫХ СИСТЕМ
- Subjects
ГИС ,noise ,качество городской среды ,spatial analysis ,urban environment quality ,noise pollution ,шум ,GIS ,пространственный анализ ,Krasnodar ,картографирование ,mapping ,шумовое загрязнение ,Краснодар - Abstract
В статье рассматриваются возможности картографирования шумового загрязнения городской среды, выявления и анализа источников загрязнения. Цель исследования состоит в проведении пространственного анализа шумового загрязнения городской среды с применением геоинформационных систем, на примере трех микрорайонов различных периодов застройки г. Краснодара – мкр. Московский (2009-20 гг.), мкр. Комсомольский (1950-60 гг.) и мкр. Горгаз (1930-40 гг.). Получение данных о шумовой обстановки производилось путем измерения уровня шума на исследуемой территории с помощью современных смартфонов по специализированной методике, которая позволяет получить данные с минимальной ошибкой. По полученным измерениям были составлены карты шумового загрязнения в ПО «Arcmap». По результатам исследования, в мкр. Московский уровень шума оказался наиболее высоким – достигающим более 75 дБ на большинстве территории, что уже способно вызвать чувство дискомфорта у проживающих людей. Микрорайоны Комсомольский и Горгаз показали более близкие и более благоприятные значения – около 60 дБ. С применением картографических методов определены источники шумового загрязнения, проведен их пространственный анализ. Полученные результаты могут быть использованы в исследованиях оценки качества городской среды и проектирования мероприятий по снижению уровня шумового загрязнения., The paper discusses the possibilities of mapping the noise pollution of the urban environment, identifying and analyzing sources of pollution. The purpose of the study is to conduct a spatial analysis of the noise pollution of the urban environment using geographic information systems, considering three microdistricts of different periods of build-up in the city of Krasnodar (Moscow md. (2009-20), Komsomol md. (1950-60) and Gorgaz md. (1930-40). Obtaining data on the noise situation was carried out by measuring the noise level with modern smartphones using a specialized technique of data measuring with a minimum error. Based on the data obtained, noise pollution maps were compiled in the Arcmap software. According to the results of the study, the noise level in the Moscow microdistrict turned out to be the highest (more than 75 dB) in most of the territory, which is already capable of causing discomfort to living people. Microdistricts Komsomol and Gorgaz showed closer and more favorable values – about 60 dB. With the use of cartographic methods, the sources of noise pollution were identified, and their spatial analysis was carried out. The results obtained can be used for assessing the quality of the urban environment and designing measures to reduce noise pollution., Мониторинг. Наука и технологии, Выпуск 3 (53) 2022
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- 2022
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31. The Influence of the Ignition Advance Angle on Noise Characteristics of a Motorcycle
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N.S. Jankevich, N.N. Ishin, S.E. Kazarinov, and V.M. Shappo
- Subjects
electronic system of ignition advance angle ,noise ,working regimes of an engine ,Mechanical engineering and machinery ,TJ1-1570 - Abstract
The results of applying of electronic system of ignition advance angle control for gasoline engine are considered in this paper. Suggested approaches allow to decrease the general level of a noise, produced by a road motorcycle 3.1135 "Leader", manufactured by "Motovelo", to 3 dB(A) due to automatic setting of ignition advance angle value in correspondence with working regimes of an engine. Suggested approaches can be used during developing of control systems of wide spectrum of engines.
- Published
- 2008
32. Modeling the operation of an EPR magnetometer under conditions of fluctuations in system parameters
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магнитное поле ,noise ,парамагнитный резонанс ,матрица плотности ,paramagnetic resonance ,magnetic field ,прецессия ,electronic magnetometers ,шум ,spin polarization ,электронный ,спиновая поляризация ,precession ,магнитометры ,density matrix - Abstract
Тема выпускной квалификационной работы: «Моделирование работы ЭПР-магнитометра в условиях флуктуаций параметров системы» В данной работе описано создание модели магнитометра на электронном параметрическом резонансе и расчет его сигнала. Создание модели было произведено с помощью матрицы плотности !, которая описывала состояние атома в каждый момент времени. Был написан ряд программ на языке Python, с помощью которых были получены необходимые данные и построены графики, позволяющие оценить адекватность работы модели, а также пронаблюдать закономерности поведения системы при определенных условиях. После прохождения системой проверки на адекватность, а также при получении информации о ней (резонансная частота), в продольное магнитное поле системы был добавлен белый шум, состоящий из 160 синусоид с одинаковой амплитудой и разными фазами, задаваемые с помощью функции выбора случайных чисел в необходимом диапазоне значений, что позволило считать, что шум задается случайно и без какой-либо зависимости. После этого был также был построен ряд графиков, которые позволили увидеть, что система с внесенным в нее шумом работает адекватно и проанализировать изменения поведения системы с внесением в нее шума. При анализе этих графиков были сделаны следующие выводы: • даже при малых значениях шума, вносимого в систему, сигнал существенно изменяется • шум продольного поля, вносимого в систему и шум сигнала, получаемого на выходе, связаны друг с другом сложной зависимостью • значение квадрата амплитуды шума сигнала на выходе имеет пик значения на частоте, отличной от резонансной, что позволяет довольно легко отфильтровать этот шум • было замечено, что шум сигнала на выходе после частоты, примерно равной 3,5 МГц, имеет очень малые значения, что позволяет считать, что высокочастотный шум в сигнале отсутствует, The subject of the graduate qualification work is « Modeling the operation of an EPR magnetometer under conditions of fluctuations in system parameters» This paper describes the creation of a model of a magnetometer based on electronic parametric resonance and the calculation of its signal. The model was created using the density matrix ρ, which described the state of the atom at each moment in time. A number of programs were written in Python, with the help of which the necessary data were obtained and graphs were constructed to evaluate the adequacy of the model, as well as to observe the patterns of system behavior under certain conditions. After the system passed the check for adequacy, as well as when receiving information about it (resonant frequency), a white noise was added to the longitudinal magnetic field of the system, consisting of 160 sinusoids with the same amplitude and different phases, set using the random number selection function in the required range values, which allowed us to assume that the noise is set randomly and without any dependence. After that, a number of graphs were also built, which made it possible to see that the system with the noise introduced into it works adequately and analyze the changes in the behavior of the system with the introduction of noise. When analyzing these graphs, the following conclusions were made: • even at low noise introduced into the system, the signal changes significantly • the noise of the longitudinal field introduced into the system and the noise of the signal received at the output are connected with each other by a complex relationship • the squared value of the amplitude of the noise of the signal at the output has a peak value at a frequency different from the resonance, which makes it quite easy to filter out this noise • it was noted that the noise of the output signal after a frequency of approximately 3.5 MHz is very small, which suggests that there is no high-frequency noise in the signal
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- 2020
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33. Reducing the impact of noise on the locksmith-repairman to replace the filter cloth in the technological process of obtaining apatite concentrate
- Subjects
глушитель активного типа ,слесарь-ремонтник ,noise ,вредный или опасный производственный фактор ,locksmith ,muffler ,harmful or dangerous production factor ,acoustic safety ,AutoCAD modeling ,шум ,акустическая безопасность ,моделирование AutoCAD - Abstract
В данной работе проводится разработка мероприятий по снижению уровня шума на рабочем месте слесаря-ремонтника по замене фильтроткани. Задачи, которые решались в ходе исследования: 1. Анализ хозяйственной деятельности Кировского филиала Акционерного общества «Апатит». 2. Описание рабочего места слесаря-ремонтника по замене фильтроткани в корпусе фильтрации и сушки. 3. Анализ шума, воздействующего на слесаря-ремонтника по замене фильтроткани и методы снижения уровня шума. 4. Обеспечение акустической безопасности на рабочем месте слесаря-ремонтника по замене фильтроткани. Работа проведена на базе КФ АО «Апатит» в рамках конкурса «Профстажировки.рф 2.0». Название кейса: «Снижение воздействия вредных факторов на работников КФ АО «Апатит». При решении кейса предоставлялась информация о рабочем месте слесаря-ремонтника, технологических процессах получения апатитового концентрата. На основе результатов производственного контроля и специальной оценки условий труда определен источник шума – вентилятор ВДН-17. Проведён анализ российских и зарубежных исследований в области негативного воздействия шума на организм человека и методов борьбы с производственным шумом. В результате разработаны рекомендации по снижению негативного воздействия шума на слесаря-ремонтника по замене фильтроткани. В работе проведен расчёт габаритов, стоимости материалов и акустической эффективности глушителя для данного вентилятора. Графическая часть выполнена с использованием графического редактора AutoCAD19., In this work, the development of measures to reduce the noise level at the workplace of a locksmith-repairman to replace filter cloth is carried out. Tasks that were solved during the research: 1. Analysis of the economic activity of the Kirov branch of the joint-Stock company "Apatit". 2. Description of the replacement locksmith's workplace filter fabrics in the filtration and drying case. 3. Analysis of noise affecting the locksmith-repairman by filter cloth replacement and noise reduction methods. 4. Ensuring acoustic safety in the workplace a locksmith-repairman to replace filter cloth. The work was carried out based on the CF JSC Apatit in the framework of the competition " Profstazhirovki.rf 2.0". The name of the case: "Reducing the impact of harmful factors on employees of the CF JSC Apatit. When solving the case, information was provided about the workplace of a repairman, technological processes for obtaining Apatite concentrate. Based on the results of production control and a special assessment of working conditions, the noise source – the VDN-17 fan-was determined. The analysis of Russian and foreign research in the field of the negative impact of noise on the human body and methods of combating industrial noise As a result, recommendations were developed to reduce the negative impact of noise on the locksmith-repairman to replace filter cloth. The paper calculates the size, cost of materials and acoustic efficiency of the silencer for this fan. The graphic part is made using graphic editor AutoCAD 19.
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- 2020
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34. Applications of Neural Networks with Residial Architecture for Filtration of Impulse Noise on Images
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noise ,neural network ,шумы ,denoising ,фильтрация ,residual ,нейросети - Abstract
На текущий момент обработка изображений – одна из наиболее быстро развивающихся областей обработки данных. Данные изображений подвергаются воздействию шумов на протяжении процедуры захвата и передачи данных по каналам связи. С каждым годом объем данных изображений увеличивается. Таким образом задача удаления шумов с изображений становиться все более актуальной. В последнее время набирают популярность нейросетевые подходы к решению задачи фильтрации шумов. Для обучения сложных архитектур нейросетей используют дополнительные блоки, существенно влияющие на показатели производительности. В данной работе предложена архитектура нейросети с residual блоками, позволяющая осуществить фильтрацию с высокими показателями качества и времени. Currently, image processing is one of the fastest growing data processing area. Image data becomes corrupted by noise during the capture and transmission of data over communication channels. Every year data size of the images grows up. Thus, removing noise from images is increasingly relevant task. Recently, neural network approaches of solving this problem become more popular. Additional blocks are used for training deep neural networks, that significantly affects the performance. This paper proposes a neural network architecture with residual blocks that allows filtering with high quality and performance.
- Published
- 2020
35. ЭКСПЕРИМЕНТАЛЬНЫЕ ИССЛЕДОВАНИЯ ШУМА И ВИБРАЦИИ ПРИ МЕСТНОМ УПРОЧНЕНИИ ДЕТАЛЕЙ ШАРИКО-СТЕРЖНЕВЫМ УПРОЧНИТЕЛЕМ
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noise ,динамика ,ball-rod hardener ,шарико-стержневой упрочнитель ,dynamics ,vibration ,шум ,вибрация - Abstract
This paper focuses on studying the regularities of the spectral composition of noise and vibration when processing the machinery parts by ball-rod hardener with different methods of fixing. For vibration finish hardening of parts, the methods are used of surfaces local strengthening in the area of stress concentrators as opposed to the full treatment of the entire surface of the product. The advantage of this method is to ensure the uniformity of hardening with the possibility of strengthening the entire surface. The use of ball-rod hardeners is possible on all types of flat and curved surfaces, with the effects of modification, smoothing and regularization of micro-relief, correction of macrodefects and residual deformations. The disadvantages of the method limiting its wide application include bounded dynamic and technological capabilities, as well as the need to protect workers from noise and vibration. With high noise activity of this method of processing, to obtain significant noise reduction in the source (system tool - workpiece) is almost impossible. Implementation of sanitary standards can be achieved only through the design of a sound-proof structure with the required amount of sound insulation., В статье приведены результаты исследований, цель которых заключалась в изучении закономерностей спектрального состава шума и вибраций при обработке шарико-стержневым упрочнением деталей с различными способами закрепления. Для вибрационной отделочно-упрочняющей обработки деталей применяются методы с локальным упрочнением поверхностей в районе концентраторов напряжений по сравнению с полной обработкой всей поверхности изделия. Преимуществом этого метода является обеспечение равномерности упрочнения по поверхности и возможность упрочнения одновременно всей поверхности. Применение шарико-стержневого упрочнения возможно на всех видах плоских и искривленных поверхностей, с эффектами модификации, сглаживания и регуляризации микро-рельефа, исправления макродефектов, остаточных деформаций. К недостаткам метода, сдерживающим его широкое применение, относятся ограниченные динамические и технологические возможности, а также необходимость защиты работников от шума и вибрации. При высокой шумовой активности данного метода обработки заготовок практически нет возможности добиться существенного снижения шума в самом источнике (системе инструмент-заготовка). Выполнение санитарных норм возможно только за счет проектирования звукозащитной конструкции с требуемой величиной звукоизоляции., №1(39) (2019)
- Published
- 2019
- Full Text
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36. Updating of the program 'Organization and conduct of production control' at Peter the Great St. Petersburg Polytechnic University for the period 2019-2020
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noise ,lighting ,ÑÑм ,микÑÐ¾ÐºÐ»Ð¸Ð¼Ð°Ñ ,пÑоÑилакÑиÑеÑкие меÑопÑиÑÑÐ¸Ñ ,ÑÑÐ»Ð¾Ð²Ð¸Ñ ÑÑÑда ,tension ,вибÑаÑÐ¸Ñ ,heaviness ,оÑвеÑенноÑÑÑ ,пÑоизводÑÑвеннÑй конÑÑÐ¾Ð»Ñ ,prevention measures ,ÑаниÑаÑнÑе пÑавила ,industrial control ,working condi-tions ,vibration ,sanitary norms ,ÑÑжеÑÑÑ ,sanitary rules ,microclimate ,напÑÑженноÑÑÑ ,ÑаниÑаÑнÑе ноÑÐ¼Ñ - Abstract
Рданной ÑабоÑе пÑоизводиÑÑÑ Ð¸Ð·ÑÑение ÑÑÑÑкÑÑÑÑ Ð¸ ÑоÑÑава пÑогÑÐ°Ð¼Ð¼Ñ Ð¿ÑоизводÑÑвенного конÑÑолÑ. Ð Ñ Ð¾Ð´Ðµ ÑабоÑÑ Ð¿ÑоизводиÑÑÑ Ð°Ð½Ð°Ð»Ð¸Ð· пÑогÑÐ°Ð¼Ð¼Ñ Ð¿ÑоизводÑÑвенного конÑÑÐ¾Ð»Ñ Ð² СанкÑ-ÐеÑеÑбÑÑгÑком полиÑÐµÑ Ð½Ð¸ÑеÑком ÑнивеÑÑиÑеÑе, ее ÑÑавнение Ñ ÑÑебованиÑми ноÑмаÑивнÑÑ Ð´Ð¾ÐºÑменÑов и вÑÑвление доÑÑоинÑÑв и недоÑÑаÑков., This paper studies the structure and composition of the production control program. In the course of the work, an analysis of the production control program at St. Petersburg Polytechnic University is made, its comparison with the requirements of regulatory documents and the identification of strengths and weaknesses.
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- 2019
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37. Normalization of working conditions at the workplace of the cook of the cold shop LLC 'Mint'
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noise ,Ð¿Ð¾Ð²Ð°Ñ Ñ Ð¾Ð»Ð¾Ð´Ð½Ð¾Ð³Ð¾ ÑÐµÑ Ð° ,cold shop ,оÑенка ÑÑловий ÑÑÑда ,локалÑÐ½Ð°Ñ Ð²Ð¸Ð±ÑаÑÐ¸Ñ ,ÑÑм ,means of individual protection ,cook cold shop ,Ñ Ð¾Ð»Ð¾Ð´Ð½Ñй ÑÐµÑ ,local vibration ,ÑÑедÑÑва индивидÑалÑной заÑиÑÑ ,assessment of conditions of work - Abstract
Рданной ÑабоÑе пÑоведен анализ ÑоÑÑоÑÐ½Ð¸Ñ ÑÑловий ÑÑÑда на ÑабоÑем меÑÑе поваÑа Ñ Ð¾Ð»Ð¾Ð´Ð½Ð¾Ð³Ð¾ ÑÐµÑ Ð°, на оÑнове коÑоÑого вÑÑÐ²Ð»ÐµÐ½Ñ Ð¿ÑиÑÐ¸Ð½Ñ ÑÑавмаÑизма. РазÑабоÑÐ°Ð½Ñ Ð¼ÐµÑопÑиÑÑÐ¸Ñ Ð´Ð»Ñ ÑÐ½Ð¸Ð¶ÐµÐ½Ð¸Ñ Ð²ÑеднÑÑ Ð¸ опаÑнÑÑ Ð¿ÑоизводÑÑвеннÑÑ ÑакÑоÑов. ÐÑоведен ÑаÑÑÐµÑ ÑквиваленÑного ÑÑÐ¾Ð²Ð½Ñ Ð·Ð²Ñка пÑи иÑполÑзовании овоÑеÑезаÑелÑного обоÑÑдованиÑ., In this paper, we analyze the state of working conditions at the workplace of a cook in a cold shop, on the basis of which the causes of injuries are identified. Measures have been developed to reduce harmful and dangerous production factors. The equivalent sound level was calculated using vegetable-cutting equipment.
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- 2019
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38. Normalization of working conditions at the workplace of a mechanic-repairman
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ÑÐµÑ ,noise ,difficulty of work ,workshop ,harmful production factors ,оÑенка ÑÑловий ÑÑÑда ,repairman ,ÑÑм ,ÑÑедÑÑва индивидÑалÑной заÑиÑÑ ,industrial injuries ,пÑоизводÑÑвеннÑй ÑÑавмаÑизм ,ÑлеÑаÑÑ-ÑемонÑник ,ÑÑжеÑÑÑ ÑÑÑда ,personal protective equipment ,assessment of working conditions ,вÑеднÑе пÑоизводÑÑвеннÑе ÑакÑоÑÑ - Abstract
Рданной ÑабоÑе пÑоведен анализ ÑоÑÑоÑÐ½Ð¸Ñ ÑÑловий ÑÑÑда на ÑабоÑем меÑÑе ÑлеÑаÑÑ-ÑемонÑника меÑодом опÑоÑнÑÑ Ð°Ð½ÐºÐµÑ, на оÑнове коÑоÑого вÑÑÐ²Ð»ÐµÐ½Ñ Ð½ÐµÐºÐ¾ÑоÑÑе неÑооÑвеÑÑÑвиÑ. РазÑабоÑÐ°Ð½Ñ Ð¼ÐµÑопÑиÑÑÐ¸Ñ Ð¿Ð¾ Ð¸Ñ ÑÑÑÑÐ°Ð½ÐµÐ½Ð¸Ñ Ð¸Ð»Ð¸ огÑаниÑÐµÐ½Ð¸Ñ Ð¿Ð¾ÑледÑÑвий. ÐÑоведен ÑаÑÑÐµÑ ÑÐ½Ð¸Ð¶ÐµÐ½Ð¸Ñ ÑÑÐ¾Ð²Ð½Ñ Ð·Ð²Ñка пÑи иÑполÑзовании менее ÑÑмного обоÑÑÐ´Ð¾Ð²Ð°Ð½Ð¸Ñ Ð¸ огÑаниÑении вÑемени ÑабоÑÑ Ð½Ð° ÑÑанке., In this paper, the analysis of working conditions in the workplace repairman by questionnaires, on the basis of which identified some inconsistencies. Measures have been developed to eliminate or limit the consequences. The calculation of sound level reduction using less noisy equipment and limiting the time of work on the machine.
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- 2019
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39. Development of measures to improve working conditions of the crane operator
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неÑÐ´Ð¾Ð±Ð½Ð°Ñ ÑабоÑÐ°Ñ Ð¿Ð¾Ð·Ð° ,noise ,ÑаÑÑÐµÑ Ð·Ð²ÑкоизолÑÑии ÐºÐ°Ð±Ð¸Ð½Ñ ,working conditions ,ÑÑм ,method of survey questionnaire ,маÑиниÑÑ Ð¼Ð¾ÑÑового кÑана ,gravity of labor process ,ÑÑÐ»Ð¾Ð²Ð¸Ñ ÑÑÑда ,calculation of sound circulation ,ÑÑедÑÑва индивидÑалÑной заÑиÑÑ ,bridge crane operator ,uncomfortable working posture ,кÑан ,crane ,personal protective equipment ,ÑÑжеÑÑÑ ÑÑÑдового пÑоÑеÑÑа ,меÑод опÑоÑнÑÑ Ð°Ð½ÐºÐµÑ - Abstract
Рданной ÑабоÑе пÑоведен наÑÑнÑй анализ ÑоÑÑоÑÐ½Ð¸Ñ ÑÑловий ÑÑÑда маÑиниÑÑа моÑÑового кÑана меÑодом опÑоÑнÑÑ Ð°Ð½ÐºÐµÑ, на оÑнове коÑоÑого вÑÑÐ²Ð»ÐµÐ½Ñ Ð½ÐµÑооÑвеÑÑÑÐ²Ð¸Ñ Ð¼ÐµÐ¶Ð´Ñ ÑезÑлÑÑаÑами ÑпеÑиалÑной оÑенки ÑÑловий ÑÑÑда на ÑабоÑем меÑÑе маÑиниÑÑа моÑÑового кÑана и ÑакÑиÑеÑкими ÑÑловиÑми ÑÑÑда. РазÑабоÑÐ°Ð½Ñ Ð¼ÐµÑопÑиÑÑÐ¸Ñ Ð¿Ð¾ ноÑмализаÑии ÑÑловий ÑÑÑда. ÐÑоведен ÑаÑÑÐµÑ ÑÐ½Ð¸Ð¶ÐµÐ½Ð¸Ñ ÑÑÐ¾Ð²Ð½Ñ Ð·Ð²Ñка пÑи звÑкоизолÑÑии ÐºÐ°Ð±Ð¸Ð½Ñ Ð¼Ð°ÑиниÑÑа моÑÑового кÑана пÑÑем ее оÑÑеклениÑ., In this paper, a scientific analysis of the working conditions of the bridge crane operator by the method of questionnaires, on the basis of which revealed discrepancies between the results of a special assessment of working conditions at the workplace of the bridge crane operator and the actual working conditions. Measures to normalize working conditions have been developed. The calculation of the sound level reduction in the sound insulation of the driver's cabin bridge crane by its glazing.
- Published
- 2018
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40. Methods of filtering the graph images of the functions
- Author
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Boursa, О. G. and Molchanova, V. S.
- Subjects
graph ,picture ,filter ,filtering ,function ,noise ,график ,изображение ,фильтр ,фильтрация ,функция ,шум ,графік ,зображення ,фільтр ,фільтрація ,функція - Abstract
Рассмотрен теоретический аспект очистки растровых изображений сканированных графиков функций от цифрового хроматического и яркостного шума с применением методов машинной графики. Предложен комплекс методов подавления полутонового шума, обеспечивающий высокое качество изображений графиков функций, Розглянуто теоретичний аспект чищення сканованих растрових зображень графіків функцій від цифрового хроматичного і яскравісного шуму із застосуванням методів машинної графіки. Запропоновано комплекс методів приглушення напівтонового шуму, що забезпечує високу якість зображень графіків функцій, The theoretical aspects of cleaning raster images of scanned graphs of functions from digital, chromatic and luminance distortions by using computer graphics techniques have been considered. The basic types of distortions characteristic of graph images of functions have been stated. To suppress the distortion several methods, providing for high-quality of the resulting images and saving their topological features, were suggested. The paper describes the techniques developed and improved by the authors: the method of cleaning the image of distortions by means of iterative contrasting, based on the step-by-step increase in image contrast in the graph by 1%; the method of small entities distortion restoring, based on the thinning of the known matrix of contrast increase filter (the allowable dimensions of the nucleus dilution radius convolution matrix, which provide for the retention of the graph lines have been established); integration technique of the noise reduction method by means of contrasting and distortion restoring method of small entities with known σ-filter. Each method in the complex has been theoretically substantiated. The developed methods involve treatment of graph images as the entire image (global processing) and its fragments (local processing). The metrics assessing the quality of the resulting image with the global and local processing have been chosen, the substantiation of the choice as well as the formulas have been given. The proposed complex methods of cleaning the graphs images of functions from grayscale image distortions is adaptive to the form of an image carrier, the distortion level in the image and its distribution. The presented results of testing the developed complex of methods for a representative sample of images confirm its effectiveness
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- 2017
41. Віброакустичні проблеми та шляхи їх вирішення на залізничному транспорті
- Author
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Byelikov, А. S., Kordunov, S. P., Dolhopolova, N. V., and Holender, V. A.
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railway transport ,noise ,noise standards ,noise sources ,noise reduction ,dynamic of transient processes ,железнодорожный транспорт ,шум, норма шума ,источники шума ,снижение шума ,динамика переходных процессов ,залізничний транспорт ,шум ,норма шуму ,джерела шуму ,зниження шуму ,динаміка перехідних процесів - Abstract
Рассмотрена и изучена макроструктура электрического транспорта, в том числе железнодорожного. Выявлены факторы, влияющие на природные экологические системы. Одним из наиболее опасных загрязнений окружающей среды является транспортный шум. Излагается постановочная часть проблемы, стоящей перед академическими и отраслевыми учеными и специалистами о снижении виброакустической активности подвижного состава железнодорожного транспорта. Намечаются пути ее решения с целью снижения вибраций и шума, оказывающих вредное воздействие на машинистов, пассажиров и на селитебною зону, прилегающего к этой коммуникационной системе пространства., Розглянута і вивчена макроструктура електричного транспорту, у тому числі залізничного. Виявлено фактори, що впливають на природні екологічні системи. Одним з найбільш небезпечних забруднень навколишнього середовища є транспортний шум. Викладається постановочна частина проблеми, що стоїть перед академічними та галузевими науковцями та фахівцями про зниження віброакустичною активності рухомого складу залізничного транспорту. Намічаються шляхи її вирішення з метою зниження вібрацій і шуму, що роблять шкідливий вплив на машиністів, пасажирів і на селітебну зону, прилеглого до цієї комунікаційній системі простору., Macrostructure of electric vehicles, including the train are considered and studied. Factors affecting the natural ecosystems is identified. It is shown that one of the most dangerous environmental pollution is traffic noise. The paper presents the problem of reducing the production of vibro-acoustic activity of railway rolling stock. The ways of its solution in order to reduce vibration and noise, adversely affecting the drivers, passengers and residential area adjacent to the communication system of the space.
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- 2015
42. Пути снижения шума на предприятиях по производству ЖБИ и на прилегающих к ним городских территориях
- Author
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Safonov, V. V., Bogdanov, Yu. V., and Parashchien, I. N.
- Subjects
noise ,sound ,sound energy ,noise regime ,map Noise ,enterprises for the production of reinforced concrete products and structures ,vibration aggregate ,шум ,звук ,звуковая энергия ,шумовой режим ,карта шума ,предприятия по производству железобетонных изделий и конструкций ,виброагрегат ,звукова енергія ,шумовий режим ,карта шуму ,підприємства з виробництва залізобетонних виробів та конструкцій ,віброагрегат - Abstract
The paper presents the results of in-situ studies of harmful industrial Factors, identified the main sources of noise in the molding stations, The problems of noise reduction at enterprises JBI and on the adjacent urban areas., В работе приведены результаты натурных исследований вредных производственных факторов, выявлены основные источники шума на постах формовки, рассмотрены вопросы снижения шума на предприятиях производству ЖБИ и на прилегающих к ним городских территориях., У роботі наведені результати натурних досліджень шкідливих виробничих чинників, виявлено основні джерела шуму на постах формування, розглянуті питання зниження шуму на підприємствах виробництва ЗБВ і на прилеглих до них міських територіях.
- Published
- 2013
43. On noise and feature settings action on quality of the automatic speech recognition system
- Author
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Yolkin, S. A., Liashenko, A. G., Ovsyanik, V. P., and Prodeus, A. N.
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распознавание речи ,помехи ,шумоподавление ,параметризация ,транскрибирование ,речевой корпус ,speech recognition ,noise ,noise reduction ,parameterization, transcription, speech corpus ,розпізнавання мови ,завади ,шумозаглушення ,параметризація ,транскрибування ,мовленнєвий корпус - Abstract
Экспериментально исследовано влияние помех и некоторых характеристик системы автоматического распознавания речи на качество распознавания. Получены рекомендации по оптимизации параметров системы автоматического распознавания речи для нескольких сценариев ее использования., Розробку систем автоматичного розпізнавання мови доцільно робити з урахуванням впливу перешкод різної природи (шум акустичного оточення, реверберація, фільтрація й кодування мовного сигналу в системах зв'язку). В даній роботі експериментально досліджено вплив завад і деяких характеристик системи автоматичного розпізнавання мови на якість розпізнавання. Отримано рекомендації з оптимізації параметрів системи автоматичного розпізнавання мови для декількох сценаріїв її використання.Бібл.10, рис. 1, табл.6., The development of automatic speech recognition systems is expedient to make with the different nature of interference (noise acoustic environment, reverberation, filtering and encoding of speech in communication systems). The effect of noise and some features of the automatic speech recognition system on the recognition quality is experimentally investigated in this paper. Recommendations on the parameters optimization of the automatic speech recognition system for several scenarios of usage are obtained.Reference 10, figures 1, tables 6.
- Published
- 2013
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