Pub Date : 2021-01-01DOI: 10.36336/akustika202141186
A. Shvetsov, Viktor Gromov
The round-the-clock vehicles operation at the airports, including in low visibility conditions with fog, snowfall, etc., requires the development of new methods for monitoring their traffic, including those that do not require direct visual contact between the dispatcher and the vehicles. In this study, a method for monitoring airport traffic based on acoustic scanning of the territory has been developed. The method allows you to control traffic remotely, including in conditions of ‘zero’ visibility. Controlled vehicles include ground vehicles that ensure airport operation, including tractors, tankers, buses for delivering passengers and the crew to the aircraft, snow plows, cars, etc. The method provides equipping the airport territory where vehicle traffic is possible with a network of acoustic sensors configured to detect noise generated by vehicle traffic, which allows you to receive traffic data on the airport territory. The structure of the airport traffic control system based on acoustic scanning and the algorithm of its operation is developed in the study for practical implementation of the method. To configure the acoustic sensors, which are the main element of the system, the noise generated by various types of airport vehicles was measured. The proposed method and the system implementing it can be used to prevent emergencies, as well as to ensure aviation security at airports.
{"title":"TRAFFIC CONTROL AT THE AIRPORT BASED ON ACOUSTIC SCANNING","authors":"A. Shvetsov, Viktor Gromov","doi":"10.36336/akustika202141186","DOIUrl":"https://doi.org/10.36336/akustika202141186","url":null,"abstract":"The round-the-clock vehicles operation at the airports, including in low visibility conditions with fog, snowfall, etc., requires the development of new methods for monitoring their traffic, including those that do not require direct visual contact between the dispatcher and the vehicles. In this study, a method for monitoring airport traffic based on acoustic scanning of the territory has been developed. The method allows you to control traffic remotely, including in conditions of ‘zero’ visibility. Controlled vehicles include ground vehicles that ensure airport operation, including tractors, tankers, buses for delivering passengers and the crew to the aircraft, snow plows, cars, etc. The method provides equipping the airport territory where vehicle traffic is possible with a network of acoustic sensors configured to detect noise generated by vehicle traffic, which allows you to receive traffic data on the airport territory. The structure of the airport traffic control system based on acoustic scanning and the algorithm of its operation is developed in the study for practical implementation of the method. To configure the acoustic sensors, which are the main element of the system, the noise generated by various types of airport vehicles was measured. The proposed method and the system implementing it can be used to prevent emergencies, as well as to ensure aviation security at airports.","PeriodicalId":42295,"journal":{"name":"Akustika","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70175592","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.36336/akustika202141163
Sergei Levin, G. Tufatulin, I. Koroleva, Viktoriia Vasilyeva, E. Levina
The aim was to study amount of attenuation of input signal at the hearing aid (HA) or cochlear implant sound processor (SP) microphone by different protective tools or clothes. Materials and methods. The acoustic measurements were conducted in the soundproof cabin using artificial head with HA/SP and different protective tools, which can influence on microphone function. Probe microphone was integrated in the microphone input of SP and connected with HA verification system. Results. The biggest amount of signal attenuation was observed using water-resistant cases for SP. Changes affect the speech spectrum, therefore using such protective tools can lead to decrease of speech intelligibility. Maximum attenuation was 9.36±0.33 dB at 4000 Hz. Non-hermetic membrane protective cases gave maximum attenuation 7.67±0.18 dB (5000 Hz). Clothes which cover head lead to significant change of signal at microphone up to 9.24±0.16 dB mostly at high-frequencies, which less influences on speech intelligibility. The results confirm that clothes and protective tools for HA of SP show significant attenuation of sounds.
目的是研究不同防护工具或衣物对助听器(HA)或人工耳蜗声音处理器(SP)麦克风输入信号的衰减量。材料和方法。声学测量在隔声舱内进行，使用带有HA/SP的人工头和不同的保护工具，这些工具会影响麦克风的功能。探头麦克风集成在SP的麦克风输入端，并与HA验证系统相连。结果。使用防水保护套的SP观察到最大的信号衰减。变化会影响语音频谱，因此使用这种保护工具会导致语音清晰度下降。4000 Hz时最大衰减为9.36±0.33 dB。非密封膜保护箱最大衰减7.67±0.18 dB (5000 Hz)。遮盖头部的衣服会导致麦克风处信号发生显著变化，最大变化幅度为9.24±0.16 dB，主要发生在高频，但对语音清晰度的影响较小。研究结果证实，SP的HA防护服和防护工具对声音有明显的衰减。
{"title":"ATTENTUATION OF THE OUTPUT SIGNAL BY PROTECTIVE AND FIXING TOOLS FOR HEARING AIDS AND COCHLEAR IMPLANTS","authors":"Sergei Levin, G. Tufatulin, I. Koroleva, Viktoriia Vasilyeva, E. Levina","doi":"10.36336/akustika202141163","DOIUrl":"https://doi.org/10.36336/akustika202141163","url":null,"abstract":"The aim was to study amount of attenuation of input signal at the hearing aid (HA) or cochlear implant sound processor (SP) microphone by different protective tools or clothes. Materials and methods. The acoustic measurements were conducted in the soundproof cabin using artificial head with HA/SP and different protective tools, which can influence on microphone function. Probe microphone was integrated in the microphone input of SP and connected with HA verification system. Results. The biggest amount of signal attenuation was observed using water-resistant cases for SP. Changes affect the speech spectrum, therefore using such protective tools can lead to decrease of speech intelligibility. Maximum attenuation was 9.36±0.33 dB at 4000 Hz. Non-hermetic membrane protective cases gave maximum attenuation 7.67±0.18 dB (5000 Hz). Clothes which cover head lead to significant change of signal at microphone up to 9.24±0.16 dB mostly at high-frequencies, which less influences on speech intelligibility. The results confirm that clothes and protective tools for HA of SP show significant attenuation of sounds.","PeriodicalId":42295,"journal":{"name":"Akustika","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70175732","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.36336/akustika20214156
I. May, D. Koshurnikov
The present research dwells on existing methodical approaches to modeling and noise assessment involving mapping procedures in high density urban areas by the example of urbanized territories in a big city. The suggested approach is based on results obtained via multiple acoustic computations that were performed using specialized software packages. Computed data are interfaced with geoinformation systems for further visualization and quantitative assessment of obtained results. As regards hygienic standardization, hardware and software that are used within the approach allow accomplishing it in high density urban areas. The research concentrates on basic approaches to creating a calculated model as well as parameters of all accomplished computations. The research was performed as per a regular grid within a calculated rectangle sized 0.8*0.8 km and with a step being equal to 25 meters. This calculated rectangle contained 1,122 points. Overall, computed exposure was determined at 486,246 points located in 43 planes. A separate calculated grid corresponded to each of them in order to build a 3D model. This 3D model was made up of 43 planes including one built at 1.5 meter height in a residential area. This 3D model was created for assessing living conditions depending on a height of living (a floor in a residential building). A square of acoustic discomfort was assessed depending on a height as per such a hygienic criterion as noise exceeding 55 dBA and it allowed establishing effects produced by motor transport on noise levels. This research is an initial stage in substantiating violations of citizens’ rights for a favorable living environment and human well-being; in future it is planned to perform instrumental measurements and assess health risks.
{"title":"ASSESSING EXPOSURE TO NOISE IN HIGH DENSITY URBAN AREAS","authors":"I. May, D. Koshurnikov","doi":"10.36336/akustika20214156","DOIUrl":"https://doi.org/10.36336/akustika20214156","url":null,"abstract":"The present research dwells on existing methodical approaches to modeling and noise assessment involving mapping procedures in high density urban areas by the example of urbanized territories in a big city. The suggested approach is based on results obtained via multiple acoustic computations that were performed using specialized software packages. Computed data are interfaced with geoinformation systems for further visualization and quantitative assessment of obtained results. As regards hygienic standardization, hardware and software that are used within the approach allow accomplishing it in high density urban areas. The research concentrates on basic approaches to creating a calculated model as well as parameters of all accomplished computations. The research was performed as per a regular grid within a calculated rectangle sized 0.8*0.8 km and with a step being equal to 25 meters. This calculated rectangle contained 1,122 points. Overall, computed exposure was determined at 486,246 points located in 43 planes. A separate calculated grid corresponded to each of them in order to build a 3D model. This 3D model was made up of 43 planes including one built at 1.5 meter height in a residential area. This 3D model was created for assessing living conditions depending on a height of living (a floor in a residential building). A square of acoustic discomfort was assessed depending on a height as per such a hygienic criterion as noise exceeding 55 dBA and it allowed establishing effects produced by motor transport on noise levels. This research is an initial stage in substantiating violations of citizens’ rights for a favorable living environment and human well-being; in future it is planned to perform instrumental measurements and assess health risks.","PeriodicalId":42295,"journal":{"name":"Akustika","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70176571","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.36336/akustika20214161
Anna Lubyanchenko, A. Shashurin, N. Ivanov
The exhaust tract with a silencer installed in it is represented by a design scheme consisting of a set of separate volumes connected to each other by holes or pipes. The following assumptions were made during the calculations: working fluid (combustion products), ideal gas, gas – dynamic parameters are averaged by volume, thermodynamic parameters are constant, the walls of the structure are rigid, the turbulent jet behind the exhaust tract is non-isothermal. The basic equations of the gas-dynamic mathematical model are used: the equation of conservation of matter, the equations of conservation of energy, the equations of state. After the transformations, dependences are obtained that allow us to determine the flow rate at the gas outlet of the dynamic path, pressure, and temperature in various sections of the path.
{"title":"DEVELOPMENT AND ANALYSIS OF NEW THEORETICAL MODELS OF GAS DYNAMIC PARAMETERS OF LOW-FREQUENCY PRESSURE PULSATIONS IN EXHAUST TRACTS","authors":"Anna Lubyanchenko, A. Shashurin, N. Ivanov","doi":"10.36336/akustika20214161","DOIUrl":"https://doi.org/10.36336/akustika20214161","url":null,"abstract":"The exhaust tract with a silencer installed in it is represented by a design scheme consisting of a set of separate volumes connected to each other by holes or pipes. The following assumptions were made during the calculations: working fluid (combustion products), ideal gas, gas – dynamic parameters are averaged by volume, thermodynamic parameters are constant, the walls of the structure are rigid, the turbulent jet behind the exhaust tract is non-isothermal. The basic equations of the gas-dynamic mathematical model are used: the equation of conservation of matter, the equations of conservation of energy, the equations of state. After the transformations, dependences are obtained that allow us to determine the flow rate at the gas outlet of the dynamic path, pressure, and temperature in various sections of the path.","PeriodicalId":42295,"journal":{"name":"Akustika","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70176657","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.36336/akustika202141217
Evgenii Zhuralev, D. Chugunkov, G. Seyfelmlyukova
An important characteristic of noise silencers, which determines the effectiveness of their use, in addition to reducing the noise level and the pressure losses they create, is the operational resource. Short-term unfavorable operating modes of boilers are possible, in which condensation of water vapor on the walls of flues through which flue gases are evacuated to the environment is possible. Condensation in the gas path leads to corrosion of the metal of the flues, as well as noise silencers. The article lists recommendations for the design of noise silencers installed in the gas paths of boilers operating under conditions of possible condensation of water vapor from flue gases. The introduced silencers of noise of gas paths of boilers which not only reduce noise highly effectively, but also allow to work in difficult operational conditions are given.
{"title":"FEATURES OF NOISE REDUCTION IN GAS PATHS OF BOILERS DURING CONDENSATION OF WATER VAPOR FROM FLUE GASES","authors":"Evgenii Zhuralev, D. Chugunkov, G. Seyfelmlyukova","doi":"10.36336/akustika202141217","DOIUrl":"https://doi.org/10.36336/akustika202141217","url":null,"abstract":"An important characteristic of noise silencers, which determines the effectiveness of their use, in addition to reducing the noise level and the pressure losses they create, is the operational resource. Short-term unfavorable operating modes of boilers are possible, in which condensation of water vapor on the walls of flues through which flue gases are evacuated to the environment is possible. Condensation in the gas path leads to corrosion of the metal of the flues, as well as noise silencers. The article lists recommendations for the design of noise silencers installed in the gas paths of boilers operating under conditions of possible condensation of water vapor from flue gases. The introduced silencers of noise of gas paths of boilers which not only reduce noise highly effectively, but also allow to work in difficult operational conditions are given.","PeriodicalId":42295,"journal":{"name":"Akustika","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70175960","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.36336/akustika20214183
D. Koshurnikov, Mikhail Kartyshev
The existing regulatory and methodical base does not provide for establishing airport zones (AZs). There are no unified approaches to establishing relevant boundaries, control over them, and substantiating limitations on use of land spots. The developed procedure for establishing the sanitary (seventh) subzone in an AZ creates a universal algorithm for determining boundaries of this subzone in any AZ. Methodical approaches contain requirements to creating boundaries of the sanitary (seventh) subzone including relevant computations, computed boundaries being verified with instrumental observations (measurements), zoning the sanitary (seventh) subzone as per health risk criteria, and subsequent production control. Airports used in civil aviation have been differentiated for the first time within the procedure; it was done in order to separate requirements to accomplishing both verifying measurements and production control. Besides, approaches to zoning the sanitary (seventh) subzone in an AZ as per health risk criteria have been implemented for the first time; these criteria are applied to determine limitations on use of land spots. Averaged daily noise level (LAd) was used as a noise exposure indictor. Four zones with different risk levels were determined with different types of economic activities to be performed in them depending on functions of capital construction objects located there.
{"title":"METHOD FOR ESTABLISHING THE SEVENTH SUBZONE OF THE AERODROME AREA","authors":"D. Koshurnikov, Mikhail Kartyshev","doi":"10.36336/akustika20214183","DOIUrl":"https://doi.org/10.36336/akustika20214183","url":null,"abstract":"The existing regulatory and methodical base does not provide for establishing airport zones (AZs). There are no unified approaches to establishing relevant boundaries, control over them, and substantiating limitations on use of land spots. The developed procedure for establishing the sanitary (seventh) subzone in an AZ creates a universal algorithm for determining boundaries of this subzone in any AZ. Methodical approaches contain requirements to creating boundaries of the sanitary (seventh) subzone including relevant computations, computed boundaries being verified with instrumental observations (measurements), zoning the sanitary (seventh) subzone as per health risk criteria, and subsequent production control. Airports used in civil aviation have been differentiated for the first time within the procedure; it was done in order to separate requirements to accomplishing both verifying measurements and production control. Besides, approaches to zoning the sanitary (seventh) subzone in an AZ as per health risk criteria have been implemented for the first time; these criteria are applied to determine limitations on use of land spots. Averaged daily noise level (LAd) was used as a noise exposure indictor. Four zones with different risk levels were determined with different types of economic activities to be performed in them depending on functions of capital construction objects located there.","PeriodicalId":42295,"journal":{"name":"Akustika","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70177272","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.36336/akustika202141189
A. Nabokov, Ivan Yaistkov, A. Chukarin
The research paper presents the theoretical studies results of noise generation during workpieces processing on threading and spline shaft milling machines. It is proposed the analytical dependence determining the sound pressure and sound power for various acoustic models of the noise sources with grounding conditions of the cutting tool, workpieces and their geometric dimensions.
{"title":"THEORETICAL RESEARCH STUDIES OF REGULARITIES FORMATION OF ACOUSTIC CHARACTERISTICS FOR THREADING AND SPLINE SHAFT MILLING MACHINE","authors":"A. Nabokov, Ivan Yaistkov, A. Chukarin","doi":"10.36336/akustika202141189","DOIUrl":"https://doi.org/10.36336/akustika202141189","url":null,"abstract":"The research paper presents the theoretical studies results of noise generation during workpieces processing on threading and spline shaft milling machines. It is proposed the analytical dependence determining the sound pressure and sound power for various acoustic models of the noise sources with grounding conditions of the cutting tool, workpieces and their geometric dimensions.","PeriodicalId":42295,"journal":{"name":"Akustika","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70176347","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.36336/akustika20214036
Sourabh Dogra, Arpan Gupta
The paper discusses a simple and low-cost method to design four microphone impedance tube of measuring the acoustic properties of building materials. The acoustic properties of the material are defined by the reflection coefficient, absorption coefficient, and transmission coefficient. The experimental setup follows the ASTM-E2611 standard of four microphone impedance tube with two load boundary conditions to measure these coefficients. The setup consists of four microphones around a brass tube with the speaker at one end and termination at the other. Raw data from the four microphones is obtained through a Virtual Instrument (VI) program developed in LabView. The novelty in the design is the tapered connection between the two pipes connected via the sample holder. The mathematical equation involved in estimating acoustical properties is solved in MATLAB 2019a. The reflection and absorption coefficient data of ephony fibbrette of 15 mm thickness are compared with the data provided by an accredited laboratory. The experimental results of the in-house designed impedance tube are in good agreement with the lab results. This material is used in the auditorium, theatres for hearing comfort. Further, two new samples of ephony fibbrette along with wood fibre cement and damper has been analysed. It has been found that adding a layer of wood fibre results in an increase in the absorption coefficient whereas the addition of the damper results in an increase in the reflection coefficient.
{"title":"TEST METHOD TO DETERMINE THE ACOUSTIC PROPERTIES OF BUILDING MATERIAL BY USING MICROPHONE IMPEDANCE TUBE","authors":"Sourabh Dogra, Arpan Gupta","doi":"10.36336/akustika20214036","DOIUrl":"https://doi.org/10.36336/akustika20214036","url":null,"abstract":"The paper discusses a simple and low-cost method to design four microphone impedance tube of measuring the acoustic properties of building materials. The acoustic properties of the material are defined by the reflection coefficient, absorption coefficient, and transmission coefficient. The experimental setup follows the ASTM-E2611 standard of four microphone impedance tube with two load boundary conditions to measure these coefficients. The setup consists of four microphones around a brass tube with the speaker at one end and termination at the other. Raw data from the four microphones is obtained through a Virtual Instrument (VI) program developed in LabView. The novelty in the design is the tapered connection between the two pipes connected via the sample holder. The mathematical equation involved in estimating acoustical properties is solved in MATLAB 2019a. The reflection and absorption coefficient data of ephony fibbrette of 15 mm thickness are compared with the data provided by an accredited laboratory. The experimental results of the in-house designed impedance tube are in good agreement with the lab results. This material is used in the auditorium, theatres for hearing comfort. Further, two new samples of ephony fibbrette along with wood fibre cement and damper has been analysed. It has been found that adding a layer of wood fibre results in an increase in the absorption coefficient whereas the addition of the damper results in an increase in the reflection coefficient.","PeriodicalId":42295,"journal":{"name":"Akustika","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70174659","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.36336/akustika202141112
A. Shvetsov
Scientific expeditions to the wild are usually carried out by cars that create a negative noise load on the inhabitants of the wild. This study suggests a way to reduce such a noise load by replacing cars with internal combustion engines with electric vehicles. The measurements made it possible to specify the quantitative indicators of reducing the noise load achieved as a result of replacing cars with internal combustion engines with electric vehicles. The article specifies the limitations in the use of electric vehicles during scientific expeditions into the wild, resulting from special conditions, such as impassability and lack of service infrastructure, such as battery charging stations. The data presented in this paper may be of interest both for scientific and environmental organizations, and for government regulatory institutions in the fields of ecology, nature protection and scientific activity.
{"title":"REDUCING THE NOISE LOAD ON WILDLIFE DURING SCIENTIFIC EXPEDITIONS","authors":"A. Shvetsov","doi":"10.36336/akustika202141112","DOIUrl":"https://doi.org/10.36336/akustika202141112","url":null,"abstract":"Scientific expeditions to the wild are usually carried out by cars that create a negative noise load on the inhabitants of the wild. This study suggests a way to reduce such a noise load by replacing cars with internal combustion engines with electric vehicles. The measurements made it possible to specify the quantitative indicators of reducing the noise load achieved as a result of replacing cars with internal combustion engines with electric vehicles. The article specifies the limitations in the use of electric vehicles during scientific expeditions into the wild, resulting from special conditions, such as impassability and lack of service infrastructure, such as battery charging stations. The data presented in this paper may be of interest both for scientific and environmental organizations, and for government regulatory institutions in the fields of ecology, nature protection and scientific activity.","PeriodicalId":42295,"journal":{"name":"Akustika","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70175112","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.36336/akustika202141150
A. Shashurin, N. Ivanov, Anna Lubyanchenko, Viktoriia Vasilyeva
This article presents the results of calculations of acoustic and gas-dynamic parameters of silencers of various design designs. The calculations are based on the developed methods [1, 2]. 8 types of exhaust noise mufflers of various design designs were selected for the calculations. The article contains calculated values of the following parameters: the range of gas flow velocities at the muffler outlet pipe, m/s; pressure range, Pa; temperature range, K and acoustic power values, dB. Radiation patterns with the values of the "own" and "shift" noise parameters are presented. The separation of "own" and "shift" noise is performed. The data of comparative results of experimental and numerical parametric studies are presented; satisfactory comparative results are obtained. The influence of individual design parameters (the volume of the silencer, the presence of perforation) on the acoustic efficiency of silencers is analyzed. The mechanisms of noise reduction and ways to improve their designs are shown.
{"title":"SEPARATION OF THE CONTRIBUTIONS OF \"OWN\" AND \"SHIFT\" NOISE AND DETERMINATION OF GAS-DYNAMIC AND ACOUSTIC PARAMETERS OF SILENCERS","authors":"A. Shashurin, N. Ivanov, Anna Lubyanchenko, Viktoriia Vasilyeva","doi":"10.36336/akustika202141150","DOIUrl":"https://doi.org/10.36336/akustika202141150","url":null,"abstract":"This article presents the results of calculations of acoustic and gas-dynamic parameters of silencers of various design designs. The calculations are based on the developed methods [1, 2]. 8 types of exhaust noise mufflers of various design designs were selected for the calculations. The article contains calculated values of the following parameters: the range of gas flow velocities at the muffler outlet pipe, m/s; pressure range, Pa; temperature range, K and acoustic power values, dB. Radiation patterns with the values of the \"own\" and \"shift\" noise parameters are presented. The separation of \"own\" and \"shift\" noise is performed. The data of comparative results of experimental and numerical parametric studies are presented; satisfactory comparative results are obtained. The influence of individual design parameters (the volume of the silencer, the presence of perforation) on the acoustic efficiency of silencers is analyzed. The mechanisms of noise reduction and ways to improve their designs are shown.","PeriodicalId":42295,"journal":{"name":"Akustika","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70175758","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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