Pub Date : 2021-06-01DOI: 10.36336/AKUSTIKA202139267
O. Solovieva, Yu M Elkin
An article discusses the problem of noise reduction in a residential area located in the immediate vicinity of constructionsites. Since construction sites are often located at a short distance from existing residential buildings, it will be ineffective to install only a conventional noise barrier - walls. In this regard, we have developed a classification of shielding noise protection structures for construction sites, the complex application of which will make it possible to achieve standard noise levels in the adjacent residential area. The article presents the efficiency calculation and designs of two screens (perimeter and intra-sectoral) of five indicated in classification types.
{"title":"NOISE REDUCTION MEASURES DEVELOPMENT OF CONSTRUCTION SITES IN RESIDENTIAL BUILDING AREAS","authors":"O. Solovieva, Yu M Elkin","doi":"10.36336/AKUSTIKA202139267","DOIUrl":"https://doi.org/10.36336/AKUSTIKA202139267","url":null,"abstract":"An article discusses the problem of noise reduction in a residential area located in the immediate vicinity of constructionsites. Since construction sites are often located at a short distance from existing residential buildings, it will be ineffective to install only a conventional noise barrier - walls. In this regard, we have developed a classification of shielding noise protection structures for construction sites, the complex application of which will make it possible to achieve standard noise levels in the adjacent residential area. The article presents the efficiency calculation and designs of two screens (perimeter and intra-sectoral) of five indicated in classification types.","PeriodicalId":23663,"journal":{"name":"Volume!","volume":"11 1","pages":"267"},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74228169","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 : 2021-06-01DOI: 10.36336/AKUSTIKA202139230
R. Rakhmatov, V. Galevko, Givi Nadareishvilli, V. Zuzov
This article describes an experimental method of designing mufflers based of finite element modelling and the results of experimental study. We have presented the results of studies, including in the form of sound pressure distribution over the internal volume and transmission losses of the developed designs of the muffler. Based on the results of these studies, a design with the best vibroacoustic features was selected. The results of experimental testing of the developed and manufactured design of a catalytic silencer in a car are presented.
{"title":"IMPROVEMENT OF ACOUSTIC FEATURES OF CATALYTIC MUFFLERS","authors":"R. Rakhmatov, V. Galevko, Givi Nadareishvilli, V. Zuzov","doi":"10.36336/AKUSTIKA202139230","DOIUrl":"https://doi.org/10.36336/AKUSTIKA202139230","url":null,"abstract":"This article describes an experimental method of designing mufflers based of finite element modelling and the results of\u0000experimental study. We have presented the results of studies, including in the form of sound pressure distribution over the internal\u0000volume and transmission losses of the developed designs of the muffler. Based on the results of these studies, a design with the best vibroacoustic\u0000features was selected. The results of experimental testing of the developed and manufactured design of a catalytic silencer\u0000in a car are presented.","PeriodicalId":23663,"journal":{"name":"Volume!","volume":"23 1","pages":"230"},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78009262","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 : 2021-05-31DOI: 10.36336/AKUSTIKA20213946
W. Montano, Elena Gushiken
The COVID-19 pandemic has changed the way of life of the world's population, and initially all non-essential commercial and industrial activities in all countries were suspended, as well as the temporary closure of major airports and educational activities. As never before, environmental sound levels were reduced as a result of the quarantine, as the authorities ordered people to remain confined in their homes in order to reduce and prevent the SARS-CoV-2 transmission. Cities became silent and in some cases birds and wildlife "took over" this situation. This change in the soundscape led to sounds that were previously masked, now being heard, i.e. HVAC and other noises. This article presents the case of Lima, Peru, in which the impact and annoyance produced by aircrafts overflights are analyzed (during 2020);as well as the healthy soundscape levels achieved `thanks' to the commercial lockdown and leisure activities.
{"title":"COVID-19 AND SOUNDSCAPE CHANGES DUE TO THE LOCKDOWN. THE CASE OF LIMA, PERU","authors":"W. Montano, Elena Gushiken","doi":"10.36336/AKUSTIKA20213946","DOIUrl":"https://doi.org/10.36336/AKUSTIKA20213946","url":null,"abstract":"The COVID-19 pandemic has changed the way of life of the world's population, and initially all non-essential commercial and industrial activities in all countries were suspended, as well as the temporary closure of major airports and educational activities. As never before, environmental sound levels were reduced as a result of the quarantine, as the authorities ordered people to remain confined in their homes in order to reduce and prevent the SARS-CoV-2 transmission. Cities became silent and in some cases birds and wildlife \"took over\" this situation. This change in the soundscape led to sounds that were previously masked, now being heard, i.e. HVAC and other noises. This article presents the case of Lima, Peru, in which the impact and annoyance produced by aircrafts overflights are analyzed (during 2020);as well as the healthy soundscape levels achieved `thanks' to the commercial lockdown and leisure activities.","PeriodicalId":23663,"journal":{"name":"Volume!","volume":"19 1","pages":"48-55"},"PeriodicalIF":0.0,"publicationDate":"2021-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79037966","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 : 2021-05-31DOI: 10.36336/AKUSTIKA20213922
V. Mondrus, D. Sizov
The article contains a solution to the problem of wave propagation in a one-dimensional rod from the initial impact. A numerical-analytical method is used to solve the problem. The numerical part of the method is based on the application of the idea of the finite difference method. The analytical part uses the concept of Green’s function to solve the problem in terms of the spatial coordinate in the considered area. The results include graphs of the solution obtained at different points in time.
{"title":"APPLICATION OF A NUMERICAL-ANALYTICAL METHOD FOR SOLVING A ONE-DIMENSIONAL WAVE EQUATION","authors":"V. Mondrus, D. Sizov","doi":"10.36336/AKUSTIKA20213922","DOIUrl":"https://doi.org/10.36336/AKUSTIKA20213922","url":null,"abstract":"The article contains a solution to the problem of wave propagation in a one-dimensional rod from the initial impact. A numerical-analytical method is used to solve the problem. The numerical part of the method is based on the application of the idea of the finite difference method. The analytical part uses the concept of Green’s function to solve the problem in terms of the spatial coordinate in the considered area. The results include graphs of the solution obtained at different points in time.","PeriodicalId":23663,"journal":{"name":"Volume!","volume":"15 1","pages":"22"},"PeriodicalIF":0.0,"publicationDate":"2021-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87815093","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 : 2021-05-31DOI: 10.36336/AKUSTIKA202139183
A. Shashurin, Konstantin Fiev, Viktoriia Vasilyeva, A. Voronkov
This document specifies the methodology for measuring equivalent sound pressure levels in octave frequency bands (in dB rel. 20 μPa), equivalent and maximum A-corrected sound levels (in dB rel. to 20 μPa), generated in the rolling stock in the driver’s cabins and in the passenger rooms of the salons, using acoustic meters - multifunctional analyzers Ecophysics, noise and vibration meters, spectrum analyzers Ecophysics 110A, Oktava 110A Eco, Oktava 110A, Oktava 111, B&K 2250, 2250L, 2270, noise and vibration analyzers ASSISTANT, noise and vibration meters, digital spectrum analyzers Algorithm-05, SVAN979. This methodology is applicable for noise measurements in the driver’s cabins and in the passenger rooms of the rolling stock of both new and old models operated by the underground railway.
{"title":"DEVELOPMENT OF THE METHODOLOGY FOR MEASURING NOISE LEVELS IN THE UNDERGROUND ROLLING STOCK","authors":"A. Shashurin, Konstantin Fiev, Viktoriia Vasilyeva, A. Voronkov","doi":"10.36336/AKUSTIKA202139183","DOIUrl":"https://doi.org/10.36336/AKUSTIKA202139183","url":null,"abstract":"This document specifies the methodology for measuring equivalent sound pressure levels in octave frequency bands (in dB rel. 20 μPa), equivalent and maximum A-corrected sound levels (in dB rel. to 20 μPa), generated in the rolling stock in the driver’s\u0000cabins and in the passenger rooms of the salons, using acoustic meters - multifunctional analyzers Ecophysics, noise and vibration\u0000meters, spectrum analyzers Ecophysics 110A, Oktava 110A Eco, Oktava 110A, Oktava 111, B&K 2250, 2250L, 2270, noise and vibration\u0000analyzers ASSISTANT, noise and vibration meters, digital spectrum analyzers Algorithm-05, SVAN979. This methodology is applicable\u0000for noise measurements in the driver’s cabins and in the passenger rooms of the rolling stock of both new and old models operated by\u0000the underground railway.","PeriodicalId":23663,"journal":{"name":"Volume!","volume":"1 1","pages":"183"},"PeriodicalIF":0.0,"publicationDate":"2021-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79779997","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 : 2021-05-31DOI: 10.36336/AKUSTIKA20213976
V. Ershov, I. Khramtsov, O. Kustov
In this paper, the problem of localization of noise sources of flow around a cylinder was considered on the basis of a computational experiment using a virtual 54-channel microphone array. Numerical simulation was performed using the computational fluid dynamics software ANSYS Fluent. Several spatial orientations of the cylinder were considered for the generation of dipoles with different directions. Simulation of a simplified two-microphone azimuthal decomposition technique (ADT) is performed to determine the sound pressure level of the generated dipoles at a vortex shedding frequency of 1450 Hz. A procedure of localization of the noise of the flow around a virtual cylinder was performed using monopole and dipole beamforming algorithms. It was found that the numerical simulation results are in good agreement with the data obtained by other researchers, both in terms of the sound pressure level and the results of the localization of dipoles in space.
{"title":"DETERMINATION OF MONOPOLE AND DIPOLE SOURCES OF FLOW AROUND A CYLINDER USING A VIRTUAL MICROPHONE ARRAY","authors":"V. Ershov, I. Khramtsov, O. Kustov","doi":"10.36336/AKUSTIKA20213976","DOIUrl":"https://doi.org/10.36336/AKUSTIKA20213976","url":null,"abstract":"In this paper, the problem of localization of noise sources of flow around a cylinder was considered on the basis of a computational experiment using a virtual 54-channel microphone array. Numerical simulation was performed using the computational\u0000fluid dynamics software ANSYS Fluent. Several spatial orientations of the cylinder were considered for the generation of dipoles with different directions. Simulation of a simplified two-microphone azimuthal decomposition technique (ADT) is performed to determine the sound pressure level of the generated dipoles at a vortex shedding frequency of 1450 Hz. A procedure of localization of the noise of the flow around a virtual cylinder was performed using monopole and dipole beamforming algorithms. It was found that the numerical simulation results are in good agreement with the data obtained by other researchers, both in terms of the sound pressure level and the results of the localization of dipoles in space.","PeriodicalId":23663,"journal":{"name":"Volume!","volume":"68 1","pages":"76"},"PeriodicalIF":0.0,"publicationDate":"2021-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73098103","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 : 2021-05-31DOI: 10.36336/AKUSTIKA20213938
A. Valeev
The Paper is devoted to combined vibration and strain gauge analysis for diagnostics of industrial machines. It is suggested to use strain gauge spectrum analysis. For studying it an experimental installation is designed and created. This installation allows getting signal from strain gauge sensors with maximum frequency 12.87 kHz. According to experimental study application of strain gauge spectrum analysis can provide almost the same information as vibration spectrum analysis. Combination of these two spectrums can give more useful information. Particularly it can be used for filtering noise. In the experimental study spectrums were significantly cleared without any instrumental and digital filters, it was done only by analysis of combination of the spectrums. This study can provide more reliable diagnostics of industrial machines.
{"title":"COMBINED VIBRATION AND STRAIN GAUGE ANALYSIS FOR DIAGNOSTICS OF INDUSTRIAL MACHINES","authors":"A. Valeev","doi":"10.36336/AKUSTIKA20213938","DOIUrl":"https://doi.org/10.36336/AKUSTIKA20213938","url":null,"abstract":"The Paper is devoted to combined vibration and strain gauge analysis for diagnostics of industrial machines. It is suggested to use strain gauge spectrum analysis. For studying it an experimental installation is designed and created. This installation allows getting signal from strain gauge sensors with maximum frequency 12.87 kHz. According to experimental study application of strain gauge spectrum analysis can provide almost the same information as vibration spectrum analysis. Combination of these two spectrums\u0000can give more useful information. Particularly it can be used for filtering noise. In the experimental study spectrums were significantly cleared without any instrumental and digital filters, it was done only by analysis of combination of the spectrums. This study can\u0000provide more reliable diagnostics of industrial machines.","PeriodicalId":23663,"journal":{"name":"Volume!","volume":"34 1","pages":"38"},"PeriodicalIF":0.0,"publicationDate":"2021-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90348538","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 : 2021-05-31DOI: 10.36336/AKUSTIKA20213970
A. V. Pinchuk, V. Pinchuk
Within the framework of the conceptual approach, taking into account the previously unknown, first identified by the authors features of the conditions of the internal energy equilibrium of material media (between their different physical nature energy states), the real contribution of acoustic disturbances experienced by media in the conditions of existence into ensuring of their and of the material world as a whole mutational and evolutionary transformations is taken into account and confirmed.
{"title":"Acoustics of impacts as a factor of ensuring mutational and evolutionary transformations of the environment","authors":"A. V. Pinchuk, V. Pinchuk","doi":"10.36336/AKUSTIKA20213970","DOIUrl":"https://doi.org/10.36336/AKUSTIKA20213970","url":null,"abstract":"Within the framework of the conceptual approach, taking into account the previously unknown, first identified by the authors features of the conditions of the internal energy equilibrium of material media (between their different physical nature energy states), the real contribution of acoustic disturbances experienced by media in the conditions of existence into ensuring of their and of the material world as a whole mutational and evolutionary transformations is taken into account and confirmed.","PeriodicalId":23663,"journal":{"name":"Volume!","volume":"63 1","pages":"70-75"},"PeriodicalIF":0.0,"publicationDate":"2021-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80120387","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}
An introduction to the special collection "The Abolition of the University".
《大学的废除》特辑简介。
{"title":"Introduction: The Abolition of the University","authors":"M. Eve","doi":"10.16995/OLH.4701","DOIUrl":"https://doi.org/10.16995/OLH.4701","url":null,"abstract":"An introduction to the special collection \"The Abolition of the University\".","PeriodicalId":23663,"journal":{"name":"Volume!","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76765643","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}
This essay brings John Berger’s King (1999) together with Indra Sinha’s Animal’s People (2007) to think through displacements with/in ruins. I interpret the settings of the novels, consider the narrative voices used to articulate the stories, and contemplate the contexts provided by various paratextual devices, in order to address this primary concern. The lives depicted in King and Animal’s People are precarious, disenfranchised, exposed to (toxic) waste. They are structured by, through, and with, ruin.
{"title":"Displacements: Framing (and) Ruins in John Berger’s King and Indra Sinha’s Animal’s People","authors":"Kylie Crane","doi":"10.16995/OLH.633","DOIUrl":"https://doi.org/10.16995/OLH.633","url":null,"abstract":"This essay brings John Berger’s King (1999) together with Indra Sinha’s Animal’s People (2007) to think through displacements with/in ruins. I interpret the settings of the novels, consider the narrative voices used to articulate the stories, and contemplate the contexts provided by various paratextual devices, in order to address this primary concern. The lives depicted in King and Animal’s People are precarious, disenfranchised, exposed to (toxic) waste. They are structured by, through, and with, ruin.","PeriodicalId":23663,"journal":{"name":"Volume!","volume":"122 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79456027","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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