Pub Date : 2019-11-01DOI: 10.36336/akustika20193472
Vladimir Zhigulski, D. Zhigulskaya, V. Shuisky, Ekaterina Chebynina, V. Panichev
A comparative analysis of various biological objects sensitivity to acoustic effects is being conducted. For many animal species, the frequency range at which sounds are heard is very different from that for humans and may not even intersect with it. The total frequency range at which various animals can hear covers at least eight orders of magnitude (from hundredths of Hz to hundreds of kHz), while for humans this interval is limited to only four orders of magnitude. Thus, the existing anthropocentric standards for permissible noise levels are unsuitable for regulating their impacts on natural ecosystems and it is necessary to develop standards for sound pressure levels in the entire specified frequency range that are acceptable for the most sensitive recipients. For terrestrial and riparian ecosystems and protected areas, natural test subjects are birds, for which noise levels of 35-40 dBA do not cause pathological changes in behavior and physiological processes. This level can tentatively be considered as maximum permissible for man-made noise and for the noise of ports in particular. More reliable results will be given by regulating the permissible sound pressure levels in the entire frequency range based on reactions of the most sensitive recipients in each octave.
{"title":"ENVIROMENTAL ASPECTS OF NOISE ASSESSMENT AND REGULATION IN THE DESIGN OF PORT COMPLEXES IN RUSSIA","authors":"Vladimir Zhigulski, D. Zhigulskaya, V. Shuisky, Ekaterina Chebynina, V. Panichev","doi":"10.36336/akustika20193472","DOIUrl":"https://doi.org/10.36336/akustika20193472","url":null,"abstract":"A comparative analysis of various biological objects sensitivity to acoustic effects is being conducted. For many animal species, the frequency range at which sounds are heard is very different from that for humans and may not even intersect with it. The total frequency range at which various animals can hear covers at least eight orders of magnitude (from hundredths of Hz to hundreds of kHz), while for humans this interval is limited to only four orders of magnitude. Thus, the existing anthropocentric standards for permissible noise levels are unsuitable for regulating their impacts on natural ecosystems and it is necessary to develop standards for sound pressure levels in the entire specified frequency range that are acceptable for the most sensitive recipients. For terrestrial and riparian ecosystems and protected areas, natural test subjects are birds, for which noise levels of 35-40 dBA do not cause pathological changes in behavior and physiological processes. This level can tentatively be considered as maximum permissible for man-made noise and for the noise of ports in particular. More reliable results will be given by regulating the permissible sound pressure levels in the entire frequency range based on reactions of the most sensitive recipients in each octave.","PeriodicalId":42295,"journal":{"name":"Akustika","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43974269","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 : 2019-11-01DOI: 10.36336/akustika20193440
V. Murzinov, P. Murzinov, Sergey Popov, Julia Taratinova
Description of the effective soundproofing panel is presented. For this panel, the ratio of acoustic characteristics and surface density exceeds many modern sound insulation and sound absorbing materials and structures. This article is devoted to modeling the sound absorption coefficient of the soundproof panel. The article presents formulas for determining the coefficient of sound absorption. Construction of a sound suppressed lightweight structured panel (SSLSP) developed by the authors is shown. Comparison of the effectiveness of the SSLSP panel and modern sound-proof materials is shown.
{"title":"SOUND ABSORPTION OF SOUND SUPRESSING LIGHTWEIGHT STRUCTURED PANELS","authors":"V. Murzinov, P. Murzinov, Sergey Popov, Julia Taratinova","doi":"10.36336/akustika20193440","DOIUrl":"https://doi.org/10.36336/akustika20193440","url":null,"abstract":"Description of the effective soundproofing panel is presented. For this panel, the ratio of acoustic characteristics and surface density exceeds many modern sound insulation and sound absorbing materials and structures. This article is devoted to modeling the sound absorption coefficient of the soundproof panel. The article presents formulas for determining the coefficient of sound absorption. Construction of a sound suppressed lightweight structured panel (SSLSP) developed by the authors is shown. Comparison of the effectiveness of the SSLSP panel and modern sound-proof materials is shown.","PeriodicalId":42295,"journal":{"name":"Akustika","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48458535","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 : 2019-11-01DOI: 10.36336/akustika20193448
V. Palchikovskiy, V. Pavlogradskiy, A. Kuznetsov, R. Bulbovich
An impedance eduction method considering impedance variability along the acoustic liner is proposed. Impedance eduction is based on minimization of the residual functional, which is the discrepancy between the experimental and computed values of acoustic pressure at the interferometer microphones. The computed values are obtained by solving the Helmholtz equation, convected Helmholtz equation and linearized Navier-Stokes equations for a two-dimensional duct with an impedance wall and flow based on finite-element method. The cases of constant and variable impedance along the liner sample are considered. It is established that when taking into account the variable impedance, the residual functional decreases more than twofold against the case of constant impedance.
{"title":"ON IMPROVEMENT OF THE IMPEDANCE EDUCATION ACCURACE BY ACCOUNT OF IMPEDANCE VARIABILITY ALONG THE ACOUSTIC LINER","authors":"V. Palchikovskiy, V. Pavlogradskiy, A. Kuznetsov, R. Bulbovich","doi":"10.36336/akustika20193448","DOIUrl":"https://doi.org/10.36336/akustika20193448","url":null,"abstract":"An impedance eduction method considering impedance variability along the acoustic liner is proposed. Impedance eduction is based on minimization of the residual functional, which is the discrepancy between the experimental and computed values of acoustic pressure at the interferometer microphones. The computed values are obtained by solving the Helmholtz equation, convected Helmholtz equation and linearized Navier-Stokes equations for a two-dimensional duct with an impedance wall and flow based on finite-element method. The cases of constant and variable impedance along the liner sample are considered. It is established that when taking into account the variable impedance, the residual functional decreases more than twofold against the case of constant impedance.","PeriodicalId":42295,"journal":{"name":"Akustika","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44585863","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 : 2019-11-01DOI: 10.36336/akustika201934180
I. Khramtsov, E. Cherenkova, V. Palchikovskiy, O. Kustov
The split-type conical nozzles with replaceable exit sections with diameters of 30, 40 and 50 mm were designed and produced from steel by machine turning. In addition, the replaceable output parts of the nozzles with the same diameters were produced by additive technology (fused deposition manufacturing) from ABS plastic. In the acoustic anechoic chamber, the noise measurements of a single-stream cold air jet for all the nozzles at jet velocities in the range of 0.3-0.7 Mach numbers were carried out. The noise measurements were performed on distance of 2 m from the center of the nozzle exit section at angles from 30 to 105o. For different directions of noise radiation and different velocities of the jet, the power spectral density and overall sound pressure level were determined. The obtained results demonstrates that the jet noise for nozzles with diameter of 40 and 50 mm from steel and ABS plastic differs by no more than 1 dB, which is within the measurement error for these types of experiments. The nozzles with diameter 30 mm have a higher difference in noise, which can be explained by the more sensitivity of a nozzle with a small diameter to the deviations of geometric parameters when it produced by additive technology.
{"title":"ON APPLICABILITY OF ADDITIVE TECHNOLOGY IN PRODUCING NOZZLES FOR JET NOISE INVESTIGATIONS","authors":"I. Khramtsov, E. Cherenkova, V. Palchikovskiy, O. Kustov","doi":"10.36336/akustika201934180","DOIUrl":"https://doi.org/10.36336/akustika201934180","url":null,"abstract":"The split-type conical nozzles with replaceable exit sections with diameters of 30, 40 and 50 mm were designed and produced from steel by machine turning. In addition, the replaceable output parts of the nozzles with the same diameters were produced by additive technology (fused deposition manufacturing) from ABS plastic. In the acoustic anechoic chamber, the noise measurements of a single-stream cold air jet for all the nozzles at jet velocities in the range of 0.3-0.7 Mach numbers were carried out. The noise measurements were performed on distance of 2 m from the center of the nozzle exit section at angles from 30 to 105o. For different directions of noise radiation and different velocities of the jet, the power spectral density and overall sound pressure level were determined. The obtained results demonstrates that the jet noise for nozzles with diameter of 40 and 50 mm from steel and ABS plastic differs by no more than 1 dB, which is within the measurement error for these types of experiments. The nozzles with diameter 30 mm have a higher difference in noise, which can be explained by the more sensitivity of a nozzle with a small diameter to the deviations of geometric parameters when it produced by additive technology.","PeriodicalId":42295,"journal":{"name":"Akustika","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44138462","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 : 2019-11-01DOI: 10.36336/akustika20193444
V. Murzinov, P. Murzinov, V. Popov, V. Buyanov
The article shows the sources of aerodynamic noise in an air cushion as applied to production transport systems. It shows the relationship between the shape of the deflecting walls in the air cushion and its acoustic characteristics. Methods for reducing the level of aerodynamic noise generated by the air cushion at the source have been received.
{"title":"AIR CUSHION AS SOURCE OF AERONYNAMIC NOISE IN PNEUMATIC CONVEYORS","authors":"V. Murzinov, P. Murzinov, V. Popov, V. Buyanov","doi":"10.36336/akustika20193444","DOIUrl":"https://doi.org/10.36336/akustika20193444","url":null,"abstract":"The article shows the sources of aerodynamic noise in an air cushion as applied to production transport systems. It shows the relationship between the shape of the deflecting walls in the air cushion and its acoustic characteristics. Methods for reducing the level of aerodynamic noise generated by the air cushion at the source have been received.","PeriodicalId":42295,"journal":{"name":"Akustika","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44420416","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 : 2019-11-01DOI: 10.36336/akustika20193453
A. Baldina, L. Pastukhova, A. Sekacheva
The work is devoted to the study of the acoustic characteristics of reverberation chamber. Sound pressure measurements have been carried out to study the sound field in low and high level rooms of reverberation chamber. To determine the diffuse field of sound, the sound pressure was measured at points uniformly distributed over the area of the chambers at four levels in height. The reverberation time was studied using the method of interrupted noise and fixing the decay curve by the measuring instrument. To establish the characteristic correlation between the sound pressure level at the measuring points and the distance to the sound source, the Pearson correlation coefficient was calculated. The degree of influence of the finishing room on the amount of reverberation time was investigated.
{"title":"OPTIMIZATION OF REVERBERATION CHAMBER PARAMETERS FOR ACOUSTIC TESTS OF BUILDING CONSTRUCTION","authors":"A. Baldina, L. Pastukhova, A. Sekacheva","doi":"10.36336/akustika20193453","DOIUrl":"https://doi.org/10.36336/akustika20193453","url":null,"abstract":"The work is devoted to the study of the acoustic characteristics of reverberation chamber. Sound pressure measurements have been carried out to study the sound field in low and high level rooms of reverberation chamber. To determine the diffuse field of sound, the sound pressure was measured at points uniformly distributed over the area of the chambers at four levels in height. The reverberation time was studied using the method of interrupted noise and fixing the decay curve by the measuring instrument. To establish the characteristic correlation between the sound pressure level at the measuring points and the distance to the sound source, the Pearson correlation coefficient was calculated. The degree of influence of the finishing room on the amount of reverberation time was investigated.","PeriodicalId":42295,"journal":{"name":"Akustika","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46492023","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 : 2019-11-01DOI: 10.36336/akustika201934141
R. Rakhmatov, Vitaliy Krutolapov, V. Zuzov
The article presents the developed method of determining the attachment points of the mounts of the exhaust system to the vehicle body. The requirements for the construction of a finite element model of the exhaust system are presented, the finite element model of the exhaust system is created, the results of natural frequencies and vibration modes and the strain energy of the structure are shown.
{"title":"DEVELOPMENT OF A DESIGN METHOD FOR DETERMINING THE ATTACHMENT OF THE EXHAUST MOUNTING MOUNTS","authors":"R. Rakhmatov, Vitaliy Krutolapov, V. Zuzov","doi":"10.36336/akustika201934141","DOIUrl":"https://doi.org/10.36336/akustika201934141","url":null,"abstract":"The article presents the developed method of determining the attachment points of the mounts of the exhaust system to the vehicle body. The requirements for the construction of a finite element model of the exhaust system are presented, the finite element model of the exhaust system is created, the results of natural frequencies and vibration modes and the strain energy of the structure are shown.","PeriodicalId":42295,"journal":{"name":"Akustika","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45160648","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 : 2019-11-01DOI: 10.36336/akustika201934148
I. Starokon
The study of the occurrence of resonant oscillations when the frequency spectrum from the hydrodynamic load coincides with the natural frequencies of the elements of the offshore platforms, as a result of which the acting stresses multiply, has a great practical importance. In the process of research it was found that the most loaded elements of the platform under such an impact are the supports. In this research, the degree of influence on the supports of the force arising due to the formation and breakdown of vortices during the flow around the supports with a fluid flow is estimated. A conclusion about the influence of vibrational-fluctuations processes on the resource of offshore stationary platforms is based on this research.
{"title":"ON THE RESULTS OF STUDYING THE INFLUENCY OF VIBRATION-FLUCTUATIONS PROCESSES ON THE RESOURCE OF WELDED JOINTS OF MARINE STATIONARY PLATFORMS FOR OIL, GAS AND OTHER USEFUL MINERALS ON THE SHELF","authors":"I. Starokon","doi":"10.36336/akustika201934148","DOIUrl":"https://doi.org/10.36336/akustika201934148","url":null,"abstract":"The study of the occurrence of resonant oscillations when the frequency spectrum from the hydrodynamic load coincides with the natural frequencies of the elements of the offshore platforms, as a result of which the acting stresses multiply, has a great practical importance. In the process of research it was found that the most loaded elements of the platform under such an impact are the supports. In this research, the degree of influence on the supports of the force arising due to the formation and breakdown of vortices during the flow around the supports with a fluid flow is estimated. A conclusion about the influence of vibrational-fluctuations processes on the resource of offshore stationary platforms is based on this research.","PeriodicalId":42295,"journal":{"name":"Akustika","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48538596","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 : 2019-11-01DOI: 10.36336/akustika2019343
V. Bondarenko, Alexander Choukarin
Bridge cranes of various lifting capacities are intensively used in various industries and construction industries. Bridge cranes are a combination of diverse noise sources, such as electric motors and gearboxes for lifting and moving carriages, wheelsets and rails. One of the intensive sources of radiation of sound energy creating excess over sanitary standards are the rails. It should be noted that it is possible to reduce the noise levels of this particular source by installing vibration-damping materials, which actually provide not only a reduction in vibration levels, and, therefore, noise in the sources themselves, i.e. in an active way, but at the same time perform the function of sound insulation.
{"title":"METHODS OF NOISE REDUCTION OF BRIDGE CRANE RAILS","authors":"V. Bondarenko, Alexander Choukarin","doi":"10.36336/akustika2019343","DOIUrl":"https://doi.org/10.36336/akustika2019343","url":null,"abstract":"Bridge cranes of various lifting capacities are intensively used in various industries and construction industries. Bridge cranes are a combination of diverse noise sources, such as electric motors and gearboxes for lifting and moving carriages, wheelsets and rails. One of the intensive sources of radiation of sound energy creating excess over sanitary standards are the rails. It should be noted that it is possible to reduce the noise levels of this particular source by installing vibration-damping materials, which actually provide not only a reduction in vibration levels, and, therefore, noise in the sources themselves, i.e. in an active way, but at the same time perform the function of sound insulation.","PeriodicalId":42295,"journal":{"name":"Akustika","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43913383","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 : 2019-11-01DOI: 10.36336/akustika201934132
P. Popov, A. Kuznetsov, A. Igolkin, K. Afanasev
The acoustic loads arising during the operation of the launch vehicle are sources of in-tense vibration of its components. Basically these loads are caused by such factors as the propulsion system operation during the launch vehicle start and by oscillatory processes in a turbulent boundary layer during the launch vehicle flight. In this regard, industry normative documentation prescribes evaluating dynamic tests of the launch vehicles and autonomous tests of rocket and space equipment.These tests confirm the dynamic strength and performance of launch vehicle components. This paper presents the results of the vibroacoustic loads analysis for the dry compartments of the mid-range launch vehicle currently being designed, depending on their construction, the attachments weight and the external load, which was set both in the form of acoustic load when solving a coherent elastic and acoustic task, and in the form of harmonic pressure, equivalent to acoustic.
{"title":"THE LAUNCH VEHICLE VIBROACOUSTIC LOADS ASSESSMENT USING EXPERIMENTAL DATA AND FINITE ELEMENT MODELING","authors":"P. Popov, A. Kuznetsov, A. Igolkin, K. Afanasev","doi":"10.36336/akustika201934132","DOIUrl":"https://doi.org/10.36336/akustika201934132","url":null,"abstract":"The acoustic loads arising during the operation of the launch vehicle are sources of in-tense vibration of its components. Basically these loads are caused by such factors as the propulsion system operation during the launch vehicle start and by oscillatory processes in a turbulent boundary layer during the launch vehicle flight. In this regard, industry normative documentation prescribes evaluating dynamic tests of the launch vehicles and autonomous tests of rocket and space equipment.These tests confirm the dynamic strength and performance of launch vehicle components. This paper presents the results of the vibroacoustic loads analysis for the dry compartments of the mid-range launch vehicle currently being designed, depending on their construction, the attachments weight and the external load, which was set both in the form of acoustic load when solving a coherent elastic and acoustic task, and in the form of harmonic pressure, equivalent to acoustic.","PeriodicalId":42295,"journal":{"name":"Akustika","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48433187","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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