Pub Date : 2022-01-01DOI: 10.36336/akustika20224316
J. Smutný, L. Pazdera, Dušan Janoštík, Radovan Rímský, Iunishchenko Petr
The paper is devoted to the use of an inertial electrodynamic exciter in laboratory testing of a rail fastening sample. The exciter of Tira Company was integrated into a control system from Vibration Research Company for testing purposes. The paper includes a discussion of the motivation for using the excitation system in laboratory testing, as well as a description of the characteristics and capabilities of dynamic excitation of structures, including a proposal of methods of analysing measured data. The Vossloh rail fastening sample was used for the purpose of the article. The contribution also includes a comparison of the vibration parameters of the tested structure and recommendations for other workplaces that would like to use a similar excitation system in their vibration experiments.
{"title":"THE LABORATORY TESTING OF RAIL FASTENING BY INERTIAL ELECTRODYNAMIC EXCITER METHOD","authors":"J. Smutný, L. Pazdera, Dušan Janoštík, Radovan Rímský, Iunishchenko Petr","doi":"10.36336/akustika20224316","DOIUrl":"https://doi.org/10.36336/akustika20224316","url":null,"abstract":"The paper is devoted to the use of an inertial electrodynamic exciter in laboratory testing of a rail fastening sample. The exciter of Tira Company was integrated into a control system from Vibration Research Company for testing purposes. The paper includes a discussion of the motivation for using the excitation system in laboratory testing, as well as a description of the characteristics and capabilities of dynamic excitation of structures, including a proposal of methods of analysing measured data. The Vossloh rail fastening sample was used for the purpose of the article. The contribution also includes a comparison of the vibration parameters of the tested structure and recommendations for other workplaces that would like to use a similar excitation system in their vibration experiments.","PeriodicalId":42295,"journal":{"name":"Akustika","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70177065","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 : 2022-01-01DOI: 10.36336/akustika2022442
Quyen Tran Cao
As far as underwater source localization is concerned the Matched Field Processing (MFP) is an effective method. Floating ship localization, submarine localization in military section and fish finding in civilization are considered as the main application of MFP. Besides, determining environmental parameters such as sound speed profile, bottom topography and array tilt are also developed. Some methods such as empirical mode decomposition, adaptive MFP, compressive MFP and especially stochastic MFP using Riemannian geometry (RMFP) have been introduced recently in order to increase MFP’s reliability and resolution. It seems that the RMFP is the strongest candidate for the future development of MFP since it is inherited the strong foundation of both MFP and Riemannian Geometry. Surprisingly, not only the nature of curvature of sound wave but also the nature of MFP are exploited in RMFP. The aim of this monograph is introduce RMFP by considering the Riemannian distance instead of Euclidean distance. Two approaches of RMFP construction, i.e., isometric mappings and direct Riemannian distance calculation are introduced. The organization of this monograph is as follows. Two first chapters of this monograph revised the reader about the essential meaning of Gauss Curvature, Geodesic equation, iso-metric mapping in Riemannian Geometry and the state of the art of MFP. Chapter 3 presents Riemannian MFP. Chapter 4 concludes the monograph with discussions about the performance of MFP. This monograph is designed for graduated students, scientists and senior engineers who working in the field of underwater acoustic engineering. We would like to thanks SACLANTC for providing access of SONAR array data. We also express our gratitude to University of Engineering and Technology (VNUH) for partial financial support this monograph. Finally, I deeply express my appreciate to my family, especially my father for their patient and love to me.
{"title":"RIEMANNIAN MATCHED FIELD PROCESSING","authors":"Quyen Tran Cao","doi":"10.36336/akustika2022442","DOIUrl":"https://doi.org/10.36336/akustika2022442","url":null,"abstract":"As far as underwater source localization is concerned the Matched Field Processing (MFP) is an effective method. Floating ship localization, submarine localization in military section and fish finding in civilization are considered as the main application of MFP. Besides, determining environmental parameters such as sound speed profile, bottom topography and array tilt are also developed. Some methods such as empirical mode decomposition, adaptive MFP, compressive MFP and especially stochastic MFP using Riemannian geometry (RMFP) have been introduced recently in order to increase MFP’s reliability and resolution. It seems that the RMFP is the strongest candidate for the future development of MFP since it is inherited the strong foundation of both MFP and Riemannian Geometry. Surprisingly, not only the nature of curvature of sound wave but also the nature of MFP are exploited in RMFP. The aim of this monograph is introduce RMFP by considering the Riemannian distance instead of Euclidean distance. Two approaches of RMFP construction, i.e., isometric mappings and direct Riemannian distance calculation are introduced. The organization of this monograph is as follows. Two first chapters of this monograph revised the reader about the essential meaning of Gauss Curvature, Geodesic equation, iso-metric mapping in Riemannian Geometry and the state of the art of MFP. Chapter 3 presents Riemannian MFP. Chapter 4 concludes the monograph with discussions about the performance of MFP. This monograph is designed for graduated students, scientists and senior engineers who working in the field of underwater acoustic engineering. We would like to thanks SACLANTC for providing access of SONAR array data. We also express our gratitude to University of Engineering and Technology (VNUH) for partial financial support this monograph. Finally, I deeply express my appreciate to my family, especially my father for their patient and love to me.","PeriodicalId":42295,"journal":{"name":"Akustika","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70177792","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 : 2022-01-01DOI: 10.36336/akustika20224355
Andrea Vargová, M. Rychtáriková
The Church of Santa Maria Della Neve (Our Lady of the Snows) on Bratislava Calvary hill was built during the World War II on the site of a chapel from the 18th century and bears the hallmarks of interwar modernism (functionalism). Since 2018 the church underwent a complete renovation of the interior under the leadership of architects Tomáš Bujna and Matúš Gibala. The works included the reconstruction of the interior of the presbytery, the nave of the church, the entrance and service areas, as well as the design and implementation of new furniture. In the church, new plaster and paint were applied to the walls and ceiling. The newly painted white interior provides a sufficient amount of light and thus gives positive and balanced impression for the people present in the church. However, the minimalist style without the use of any sound-absorbing material causes a major problem with speech intelligibility during the ceremonies. Changes in the interior, such as painting the church and removing the sound-absorbing elements on the walls and furniture are responsible for doubling of the reverberation time compared to the original state. The presented article focuses on the search for ways to reduce the reverberation time to the original values by interior elements, which could be accepted in terms of architectural appearance. From the point of view of acoustics, maintaining the diffusion of space is a big challenge here, because by reckless application of additional elements and surfaces with high sound absorption, unpleasant echoes could arise in such a large space. These would probably not impair speech intelligibility dramatically but would for sure interfere with music production. Therefore, auralization was used to find the optimal solution.
{"title":"ACOUSTIC COMFORT IN THE CHURCH OF SANTA MARIA DELLA NEVE, AFTER ITS RENOVATION","authors":"Andrea Vargová, M. Rychtáriková","doi":"10.36336/akustika20224355","DOIUrl":"https://doi.org/10.36336/akustika20224355","url":null,"abstract":"The Church of Santa Maria Della Neve (Our Lady of the Snows) on Bratislava Calvary hill was built during the World War II on the site of a chapel from the 18th century and bears the hallmarks of interwar modernism (functionalism). Since 2018 the church underwent a complete renovation of the interior under the leadership of architects Tomáš Bujna and Matúš Gibala. The works included the reconstruction of the interior of the presbytery, the nave of the church, the entrance and service areas, as well as the design and implementation of new furniture. In the church, new plaster and paint were applied to the walls and ceiling. The newly painted white interior provides a sufficient amount of light and thus gives positive and balanced impression for the people present in the church. However, the minimalist style without the use of any sound-absorbing material causes a major problem with speech intelligibility during the ceremonies. Changes in the interior, such as painting the church and removing the sound-absorbing elements on the walls and furniture are responsible for doubling of the reverberation time compared to the original state. The presented article focuses on the search for ways to reduce the reverberation time to the original values by interior elements, which could be accepted in terms of architectural appearance. From the point of view of acoustics, maintaining the diffusion of space is a big challenge here, because by reckless application of additional elements and surfaces with high sound absorption, unpleasant echoes could arise in such a large space. These would probably not impair speech intelligibility dramatically but would for sure interfere with music production. Therefore, auralization was used to find the optimal solution.","PeriodicalId":42295,"journal":{"name":"Akustika","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70177833","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/akustika2021403
Tran Cao Quyen
The Matched Field Processing (MFP) plays a crucial role in modern passive SONAR system since its effectiveness of underwater source localization. Their applications are but not limited to floating boat detecting, submarine detecting, fish finding as well as ocean environmental parameters determining. In the past, the stochastic matched field processing (SMFP) are derived on the basis of Riemannian distances (RDs) which were calculated using isometric mappings (IMs). In this paper, a new STMP is provided using directed RDs which were obtained by solving the geodesic equations directly instead of using IMs. In addition, we exploit the symmetric property of Riemannian manifold to solve the geodesic equation in the simple manner. The performance of the proposed STMP outperformed to that of standard algorithm at the expense of a little more of computation.
{"title":"STOCHASTIC MATCHED FIELD PROCESSING USING DIRECTED RIEMANNIAN DISTANCE","authors":"Tran Cao Quyen","doi":"10.36336/akustika2021403","DOIUrl":"https://doi.org/10.36336/akustika2021403","url":null,"abstract":"The Matched Field Processing (MFP) plays a crucial role in modern passive SONAR system since its effectiveness of underwater source localization. Their applications are but not limited to floating boat detecting, submarine detecting, fish finding as well as ocean environmental parameters determining. In the past, the stochastic matched field processing (SMFP) are derived on the basis of Riemannian distances (RDs) which were calculated using isometric mappings (IMs). In this paper, a new STMP is provided using directed RDs which were obtained by solving the geodesic equations directly instead of using IMs. In addition, we exploit the symmetric property of Riemannian manifold to solve the geodesic equation in the simple manner. The performance of the proposed STMP outperformed to that of standard algorithm at the expense of a little more of computation.","PeriodicalId":42295,"journal":{"name":"Akustika","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70174593","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/akustika20214018
V. Kozhusko, S. Bukharov, A. Alexiev, R. Iankov
The paper discusses promising way of utilization of the buckwheat husks for production of noise abating epoxy based composites for transport infrastructure and buildings industry. Composites of different densities from 400kg/m3 up to 650 kg/m3 have been prepared. The measurements of normal coefficient of sound absorption and sound transmission loss in the range from 500 Hz up to 6400 Нz are carried out. The absorption coefficient posses local maximum depending on the density of composites approaching the value of 0.99 at 3120 Hz for the density 400 kg/m3. The sound transmission loss of composites increases with density from the mean value of 10 dB for 400kg/m3 up to 60 dB for 650 kg/m3 that is comparable with well-developed artificial materials. The pristine buckwheat husks is thermally stable of up to 200-250°С that gives thermogravimetric analysis in the range from 30°С up to 500°С. The husks is suggested as the filler for production of epoxy resin based noise abating composites.
{"title":"BUCKWHEAT HUSK AND EPOXY RESIN BASED COMPOSITES FOR NOISE ABATING","authors":"V. Kozhusko, S. Bukharov, A. Alexiev, R. Iankov","doi":"10.36336/akustika20214018","DOIUrl":"https://doi.org/10.36336/akustika20214018","url":null,"abstract":"The paper discusses promising way of utilization of the buckwheat husks for production of noise abating epoxy based composites for transport infrastructure and buildings industry. Composites of different densities from 400kg/m3 up to 650 kg/m3 have been prepared. The measurements of normal coefficient of sound absorption and sound transmission loss in the range from 500 Hz up to 6400 Нz are carried out. The absorption coefficient posses local maximum depending on the density of composites approaching the value of 0.99 at 3120 Hz for the density 400 kg/m3. The sound transmission loss of composites increases with density from the mean value of 10 dB for 400kg/m3 up to 60 dB for 650 kg/m3 that is comparable with well-developed artificial materials. The pristine buckwheat husks is thermally stable of up to 200-250°С that gives thermogravimetric analysis in the range from 30°С up to 500°С. The husks is suggested as the filler for production of epoxy resin based noise abating composites.","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":"70174867","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/akustika202141115
A. Chukarin, A. Fedenko, A. Shashurin, Viktoriia Vasilyeva
Within the framework of this article, an experiment was conducted to determine the coefficient of energy loss of oscillatory motion. The analysis of the behavior of the frequency dependence of the coefficient showed that the approximation by a polynomial of degree 7 gives the most approximate result to the experimental values. The standard deviation of the experimental data from the polynomial is consistent with the error of the experimental data.
{"title":"REGRESSION ANALYSIS OF THE COEFFICIENTS OF VIBRATION ENERGY LOSSES IN GAS-DISCHARGE SYSTEMS OF POWER PLANTS","authors":"A. Chukarin, A. Fedenko, A. Shashurin, Viktoriia Vasilyeva","doi":"10.36336/akustika202141115","DOIUrl":"https://doi.org/10.36336/akustika202141115","url":null,"abstract":"Within the framework of this article, an experiment was conducted to determine the coefficient of energy loss of oscillatory motion. The analysis of the behavior of the frequency dependence of the coefficient showed that the approximation by a polynomial of degree 7 gives the most approximate result to the experimental values. The standard deviation of the experimental data from the polynomial is consistent with the error of the experimental data.","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":"70175179","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/akustika202141195
Y. Kholopov, Elena Lukeniuk, B. Musatkina, I. Denisova
The article notes the negative impact of traffic noise on human health. The principles of noise pollution control are considered in the article. The article introduces the measurement results of traffic noise near the academic buildings of the railway transport universities in Omsk and Samara as well as the railway noise measurement results obtained near the Oktyabrsk station. Conclusions and suggestions based on the research results are presented in the article
{"title":"TRAFFIC NOISE ANALYSIS IN THE URBAN ENVIRONMENT","authors":"Y. Kholopov, Elena Lukeniuk, B. Musatkina, I. Denisova","doi":"10.36336/akustika202141195","DOIUrl":"https://doi.org/10.36336/akustika202141195","url":null,"abstract":"The article notes the negative impact of traffic noise on human health. The principles of noise pollution control are considered in the article. The article introduces the measurement results of traffic noise near the academic buildings of the railway transport universities in Omsk and Samara as well as the railway noise measurement results obtained near the Oktyabrsk station. Conclusions and suggestions based on the research results are presented in the article","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":"70175929","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/akustika20214173
Danil Bazarov, Yu M Elkin, A. Abramov, Oleg Gogiberidze
The article discusses the problem of noise pollution on the territory of driver's recreation areas on roads of various categories. Recreation areas can be both a separate element of roadside infrastructure and an integral part of multifunctional road service areas (MRSA). Recreation areas are not equipped with means of protection against traffic noise, the increased level of which makes it difficult for drivers to have a good rest. Obviously, this circumstance increases driver overwork while driving, thereby increasing the likelihood of road traffic accidents (RTA). The article proposes to protect recreation areas and MRSA with the help of noise protection screens (NPS), the installation of which will improve the quality of rest (including short-term) of drivers. At the same time, for the noise protection of a specific MRSA (M-4 Don highway), a screen with a height of 3 m was proposed, and its acoustic efficiency was calculated. Also, in the article, as a first approximation, an assessment of reducing the risk of road accidents by reducing the level of traffic noise at the rest areas of drivers is given.
{"title":"HIGHWAY RECREATION AREAS NOISE PROTECTION AS A ROAD SAFETY IMPROVING FACTOR","authors":"Danil Bazarov, Yu M Elkin, A. Abramov, Oleg Gogiberidze","doi":"10.36336/akustika20214173","DOIUrl":"https://doi.org/10.36336/akustika20214173","url":null,"abstract":"The article discusses the problem of noise pollution on the territory of driver's recreation areas on roads of various categories. Recreation areas can be both a separate element of roadside infrastructure and an integral part of multifunctional road service areas (MRSA). Recreation areas are not equipped with means of protection against traffic noise, the increased level of which makes it difficult for drivers to have a good rest. Obviously, this circumstance increases driver overwork while driving, thereby increasing the likelihood of road traffic accidents (RTA). The article proposes to protect recreation areas and MRSA with the help of noise protection screens (NPS), the installation of which will improve the quality of rest (including short-term) of drivers. At the same time, for the noise protection of a specific MRSA (M-4 Don highway), a screen with a height of 3 m was proposed, and its acoustic efficiency was calculated. Also, in the article, as a first approximation, an assessment of reducing the risk of road accidents by reducing the level of traffic noise at the rest areas of drivers is 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":"70177200","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/akustika202141133
V. Tupov, V. Skvortsov
The power equipment of thermal power plants is a source of noise to the surrounding area. One of the sources of noise for the surrounding area are gas distribution points (GDP) of thermal power plants (TPP) and district thermal power plants (RTS). Noise from gas distribution points may exceed sanitary standards at the border of the sanitary protection zone. The article shows that the radiated noise from gas distribution points depends on the power of the thermal power plant (natural gas consumption) and the type of valves. Three types of valves used in gas distribution points are considered. Formulas are obtained for calculating the width of the sanitary protection zone for gas distribution points for thermal stations, depending on the consumption of natural gas (electric power of the thermal power plant) and the type of valve. It is shown that, depending on the valve used, the noise level at the border of the sanitary protection zone can either meet sanitary standards or exceed them. This allows at the design stage to select the required type of valve or to determine mitigation measures from hydraulic fracturing.
{"title":"SANITARY PROTECTION ZONES BY NOISE FACTOR FROM GAS DISTRIBUTION POINTS","authors":"V. Tupov, V. Skvortsov","doi":"10.36336/akustika202141133","DOIUrl":"https://doi.org/10.36336/akustika202141133","url":null,"abstract":"The power equipment of thermal power plants is a source of noise to the surrounding area. One of the sources of noise for the surrounding area are gas distribution points (GDP) of thermal power plants (TPP) and district thermal power plants (RTS). Noise from gas distribution points may exceed sanitary standards at the border of the sanitary protection zone. The article shows that the radiated noise from gas distribution points depends on the power of the thermal power plant (natural gas consumption) and the type of valves. Three types of valves used in gas distribution points are considered. Formulas are obtained for calculating the width of the sanitary protection zone for gas distribution points for thermal stations, depending on the consumption of natural gas (electric power of the thermal power plant) and the type of valve. It is shown that, depending on the valve used, the noise level at the border of the sanitary protection zone can either meet sanitary standards or exceed them. This allows at the design stage to select the required type of valve or to determine mitigation measures from hydraulic fracturing.","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":"70175530","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/akustika202141137
A. Sekacheva, A. Khait, A. Noskov, L. Pastukhova
The article is devoted to issues related to the occurrence of noise and vibration in the centrifugal turbine of ventilation equipment of residential buildings. Airflow in the rotating radial-axial channel representing a simplified configuration of the interblade channel of a centrifugal turbine is studied. Numerical simulation of the airflow in the considered geometrical domain is performed using ANSYS CFX solver. A particular attention is given to different turbulence closures used in the model. Accuracy of the simulation results was estimated with respect to the laboratory measurements by J. Moore [9]. The comparison was carried out for velocity profiles measured at three different cross-sections of the channel under different mass flow rates.
{"title":"SELECTION OF TURBULENCE MODEL IN ANSYS CFX FOR INVESTIGATION OF TURBULENT NOISE AND VIBRATION OCCURRING IN INTERSCAPULAR SPACE OF THE CENTRIFUGAL TURBINE","authors":"A. Sekacheva, A. Khait, A. Noskov, L. Pastukhova","doi":"10.36336/akustika202141137","DOIUrl":"https://doi.org/10.36336/akustika202141137","url":null,"abstract":"The article is devoted to issues related to the occurrence of noise and vibration in the centrifugal turbine of ventilation equipment of residential buildings. Airflow in the rotating radial-axial channel representing a simplified configuration of the interblade channel of a centrifugal turbine is studied. Numerical simulation of the airflow in the considered geometrical domain is performed using ANSYS CFX solver. A particular attention is given to different turbulence closures used in the model. Accuracy of the simulation results was estimated with respect to the laboratory measurements by J. Moore [9]. The comparison was carried out for velocity profiles measured at three different cross-sections of the channel under different mass flow rates.","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":"70175718","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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