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DIFFRACTION OF A SPHERICAL WAVE BY A HARD HALF-PLANE: POLYNOMIAL FORMULATION OF EDGE-DIFFRACTED FIELD IN THE FREQUENCY DOMAIN 硬半平面对球面波的衍射:频域边缘衍射场的多项式公式
Akustika Pub Date : 2023-01-01 DOI: 10.36336/akustika20234563
D. Ouis
{"title":"DIFFRACTION OF A SPHERICAL WAVE BY A HARD HALF-PLANE: POLYNOMIAL FORMULATION OF EDGE-DIFFRACTED FIELD IN THE FREQUENCY DOMAIN","authors":"D. Ouis","doi":"10.36336/akustika20234563","DOIUrl":"https://doi.org/10.36336/akustika20234563","url":null,"abstract":"The problem of diffraction of a spherical sound wave by a thin hard half-plane is considered. The expression of the total field at any position in the space around the half-plane is composed of two geometrical components and a third one which originating from the edge of the half-plane. This paper takes the expression of the edge-diffracted field due to a sound doublet, as formulated in the Biot-Tolstoy theory of diffraction, BTD, but rearranged for the Dirac-like pulse by Medwin. The present paper presents a development in the frequency domain of the Fourier transform of the exact expression of the edge-diffracted field as given in the time domain. This solution is composed of a serial development, expressed in simple trigonometric integral functions, and which away from the geometrical optics boundaries shows a quite rapid convergence to the numerical Fourier transform of the exact time-domain expression. The presented solution may be used as a good approximation in simulations and in real case predictions of sound scattering by thin straight-edged noise barriers.","PeriodicalId":42295,"journal":{"name":"Akustika","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70178265","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}
引用次数: 0
OPTIMUM PROPAGATION IN OCEAN: THE COMPARISON BETWEEN NORMAL MODE AND EMPIRICAL FRANCOIS-GARRISON FORMULA 海洋中最优传播:正常模式与经验弗朗索瓦-加里森公式之比较
Akustika Pub Date : 2023-01-01 DOI: 10.36336/akustika20234542
Tran Cao Quyen
{"title":"OPTIMUM PROPAGATION IN OCEAN: THE COMPARISON BETWEEN NORMAL MODE AND EMPIRICAL FRANCOIS-GARRISON FORMULA","authors":"Tran Cao Quyen","doi":"10.36336/akustika20234542","DOIUrl":"https://doi.org/10.36336/akustika20234542","url":null,"abstract":"There are not only theory but also the empirical formula to deal with the problem of sound propagation in ocean. As such the Normal mode and Francois-Garrison are typical methods. Optimum sound propagation in ocean is the way we unify these two methods. In this paper, we investigate the transmission losses of both Normal mode and Francois- Garrison at some frequencies (170Hz, 800Hz, 100 KHz) at shallow water conditions (Tonkin gulf). The calculated and simulation results show that the optimum is achieved when the Normal mode is used at low frequencies whereas the Francois-Garrison is used at high frequencies.","PeriodicalId":42295,"journal":{"name":"Akustika","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70177680","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}
引用次数: 0
TESTING A NOVEL HYBRID SPIRAL MICROPHONE ARRAY DESIGNED FOR PERFORMANCE AND PORTA 测试一种新型的混合螺旋麦克风阵列设计的性能和门
Akustika Pub Date : 2023-01-01 DOI: 10.36336/akustika20234547
M. Aldeman, Jin-Ho Jo
{"title":"TESTING A NOVEL HYBRID SPIRAL MICROPHONE ARRAY DESIGNED FOR PERFORMANCE AND PORTA","authors":"M. Aldeman, Jin-Ho Jo","doi":"10.36336/akustika20234547","DOIUrl":"https://doi.org/10.36336/akustika20234547","url":null,"abstract":"In this investigation a novel hybrid spiral microphone array system is designed and constructed to maximize the overall performance of the array under the constraint that the array must be portable and capable of being transported in a small hatchback vehicle. Several microphone array designs are considered before settling on a modified Fermat spiral with microphones located exclusively on the axes of the array, enabling the array to be quickly disassembled into a small number of sections, transported to a remote location, and then re-assembled. The performance of the new microphone array is tested against an existing microphone array that was also designed for portability but with a more conventional logarithmic spiral design. The resolution of the new hybrid spiral array is found to greatly exceed the resolution of the conventional portable microphone array.","PeriodicalId":42295,"journal":{"name":"Akustika","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70177884","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}
引用次数: 0
THE VIBRATION MEASUREMENT USING MICROCONTROLLERS 采用单片机进行振动测量
Akustika Pub Date : 2023-01-01 DOI: 10.36336/akustika20234525
J. Smutný, Dušan Janoštík, Radovan Rímský, Iunishchenko Petr
{"title":"THE VIBRATION MEASUREMENT USING MICROCONTROLLERS","authors":"J. Smutný, Dušan Janoštík, Radovan Rímský, Iunishchenko Petr","doi":"10.36336/akustika20234525","DOIUrl":"https://doi.org/10.36336/akustika20234525","url":null,"abstract":"The contribution is devoted to the issue of measuring vibrations and possibly also noise using microcontroller technology. The contribution contains a theoretical introduction to the issue, and further describes the practical hardware implementation of the measuring system, the basis of which is a suitable microcontroller. Part of the contribution is also an analysis of the appropriateness of using such a measurement technique for application specifically in the field of railway constructions and buildings. The conclusion includes recommendations for other workplaces that would like to use this method of measurement.","PeriodicalId":42295,"journal":{"name":"Akustika","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70177544","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}
引用次数: 0
NOISE REDUCTION ON AIR DISTRIBUTION GRILLES USING 3D PRINTED INFILL STRUCTURES 采用3d打印填充结构降低气流分布格栅的噪音
Akustika Pub Date : 2023-01-01 DOI: 10.36336/akustika2023453
D. Svoboda, Petra Berková, F. Vlach, D. Beckovsky, Milan Gabzdyl, Martin Deutsch
{"title":"NOISE REDUCTION ON AIR DISTRIBUTION GRILLES USING 3D PRINTED INFILL STRUCTURES","authors":"D. Svoboda, Petra Berková, F. Vlach, D. Beckovsky, Milan Gabzdyl, Martin Deutsch","doi":"10.36336/akustika2023453","DOIUrl":"https://doi.org/10.36336/akustika2023453","url":null,"abstract":"The aim of this research is to reduce the noise level of air distribution grilles using 3D printed infill structures. The grilles are installed on a newly developed autonomous ventilation system, which is used for decentralised ventilation of e.g., school classrooms. Several supply and return grilles with functional gyroid and honeycomb shaped infill structures were created and subsequently printed on an FDM 3D printer. Based on measurements and analysis of the maximum sound pressure levels at different microphone positions around the system and at different airflows, the combination of grilles with the greatest noise reduction was selected. The research is complemented by other data such as spectral analysis of the noise, measurement of the airflow velocity through the grilles and measurement of the room reverberation time. Significant noise reduction was achieved by using the proposed grilles and further conclusions were drawn. 3D printing technology proved to be a very useful tool in this case.","PeriodicalId":42295,"journal":{"name":"Akustika","volume":"43 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70177590","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}
引用次数: 0
A BASIC STUDY ONT HE SOUND ABSORBING PROPERTIES OF SQUARE PANELS WITH HOMOGENOUS SIZE AND VARIOUS ARRANGEMENTS 均匀尺寸、不同排列方式方板吸声性能的基本研究
Akustika Pub Date : 2022-01-01 DOI: 10.36336/akustika20224335
Maryam Nikpour, Soudeh Valipour, O. Rahaei
{"title":"A BASIC STUDY ONT HE SOUND ABSORBING PROPERTIES OF SQUARE PANELS WITH HOMOGENOUS SIZE AND VARIOUS ARRANGEMENTS","authors":"Maryam Nikpour, Soudeh Valipour, O. Rahaei","doi":"10.36336/akustika20224335","DOIUrl":"https://doi.org/10.36336/akustika20224335","url":null,"abstract":"Noise disturbance at airports negatively affects people's health. This paper focuses on the study of the public spaces with a large capacity in the Ahvaz International Airport, which are perceived as acoustically uncomfortable. The main reason for poor acoustic conditions is an excessive Hall reverberation, as the measured reverberation time reached 4–5 s at middle frequencies. To overcome this acoustics problem, five square sound absorbing panels were installed on the wall surfaces of the airport lounge and the models were simulated by using EASE 4.4 software. In our research Revebration Time (RT, or main index), three other sound indices including, auditory error coefficient (ALconse) speech transmission index (STI) and total sound pressure level (SPL) were evaluated according to the international standards of ISO3382 and ISO 3382-1. The aim of this research was to introduce an acousticc treatment on the airport lounge walls to enable better absorption of sound to improve the acoustic quality of Ahvaz International Airport. After the simulation, it was concluded that of the five different square panels deployed, Model SA-1 was associated with the lowest sound pressure across different frequencies and hence this panel was considered as the ideal for improved acoustics for the space.","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":"70177307","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}
引用次数: 0
THE ACOUSTIC FEATURES AND MUSIC-CULTURAL CONTEXTS OF CONCERT AND THEATRE HALLS IN SLOVAKIA - ZICHY PALACE, THE SLOVAK NATIONAL THEATRE 声学特征和音乐文化背景的音乐会和剧院大厅在斯洛伐克- zichy宫殿，斯洛伐克国家剧院
Akustika Pub Date : 2022-01-01 DOI: 10.36336/akustika20224328
Pavol Brezina, Alena Čirena, Michal Jarabica, P. Zaťko
{"title":"THE ACOUSTIC FEATURES AND MUSIC-CULTURAL CONTEXTS OF CONCERT AND THEATRE HALLS IN SLOVAKIA - ZICHY PALACE, THE SLOVAK NATIONAL THEATRE","authors":"Pavol Brezina, Alena Čirena, Michal Jarabica, P. Zaťko","doi":"10.36336/akustika20224328","DOIUrl":"https://doi.org/10.36336/akustika20224328","url":null,"abstract":"This study deals with spatial-acoustic research on two buildings in Bratislava, built in two different historical periods, with a significantly different primary function in terms of the musical life of the town. The Opera and Ballet Hall of the Slovak National Theatre is a relatively new building with a relatively short concert history. The concert life of the Concert Hall of Zichy Palace dates back to the 18th century and has an extremely rich concert history. The present study is devoted to describing the historical and cultural contexts, while also investigating their acoustic properties. The subject of the acoustical research is the description of the basic parameters – reverberation time T, clarity C80, interaural correlation coefficient IACC and spoken speech intelligibility measure STI.","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":"70177076","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}
引用次数: 0
ASSESSING THE IMPACTS OF ROAD NOISE IN RELATION TO RESIDENTIAL AREAS AND ECONOMIC COSTS THROUGH MODELLING 通过模拟评估道路噪音对住宅区的影响和经济成本
Akustika Pub Date : 2022-01-01 DOI: 10.36336/akustika2022432
V. Krivanek, P. Marková, Blanka Hablovicova, Jan Machanec, Dana Potužníková
{"title":"ASSESSING THE IMPACTS OF ROAD NOISE IN RELATION TO RESIDENTIAL AREAS AND ECONOMIC COSTS THROUGH MODELLING","authors":"V. Krivanek, P. Marková, Blanka Hablovicova, Jan Machanec, Dana Potužníková","doi":"10.36336/akustika2022432","DOIUrl":"https://doi.org/10.36336/akustika2022432","url":null,"abstract":"This paper focuses on noise modelling and the assessment of road noise impacts in relation to residential areas and economic costs using modelling. The intention of the whole project and the authors' work is to contribute to the determination of changes in road noise levels for relevant decision-making processes with direct applicability in social sciences (regional development, sociology, demography, economics) related to health risk assessment (public health). The longevity, noise reduction levels and external cost changes of using low noise roads should therefore be appreciated. The purpose is to remove the identified disparity and to make publicly available, through a certified methodology, the data needed to assess the long-term effects of noise pollution from low-noise roads for use by regional development, thus contributing to the strategy of Directive 2002/49/EC.","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":"70177206","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}
引用次数: 0
PSYCHOLOGICAL ASPECTS OF (MICRO)INTERVALS OF THE JUST INTONATION SYSTEM 心理方面的(微)音程只是语调系统
Akustika Pub Date : 2022-01-01 DOI: 10.36336/akustika20224341
T. Reindl, V. Hruška, M. Frič
{"title":"PSYCHOLOGICAL ASPECTS OF (MICRO)INTERVALS OF THE JUST INTONATION SYSTEM","authors":"T. Reindl, V. Hruška, M. Frič","doi":"10.36336/akustika20224341","DOIUrl":"https://doi.org/10.36336/akustika20224341","url":null,"abstract":"This study presents the results of research on the psychological aspects of exactly calculated just intonation intervals, which was performed in the form of a listening test. These micro-interval nuances (śruti) are attributed specific emotions or feelings in ancient Indian music-theoretical texts, just as in the European tradition, various extra-musical qualities have been attributed to different intervals or modes since the Antiquity. The purpose of the research was therefore to try to map the psychological aspects of the selected intervals and to verify whether the respondents agreed on them. In contrast to similar research testing tempered intervals, here we are dealing with precisely tuned concords of characteristic intervals of just intonation systems (5-limit and 7-limit just intonation), realized in the form of sustained drones. The results of this research show that listening to isolated sustained concords can induce a wide range of responses in the listener, which are identical or similar for a significant number of respondents. Moreover, in some cases, the reactions to a given interval/emotion combination coincide or resemble the characteristics given by Indian or European traditions. All the results of the research have been summarized in a table which can serve practical purposes.","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":"70177387","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}
引用次数: 0
ATTENUATION CHARACTERISTICS OF TECTORIAL MEMBRANE WAVE 被膜波的衰减特性
Akustika Pub Date : 2022-01-01 DOI: 10.36336/akustika20224360
T. Kitamura, Tomoya Ueno
{"title":"ATTENUATION CHARACTERISTICS OF TECTORIAL MEMBRANE WAVE","authors":"T. Kitamura, Tomoya Ueno","doi":"10.36336/akustika20224360","DOIUrl":"https://doi.org/10.36336/akustika20224360","url":null,"abstract":"This study focuses on the attenuation characteristics of the waves that propagate on the tectorial membrane (tectorial membrane waves). The traveling wave on the basilar membrane (basilar membrane wave) plays a main role in transmitting acoustic signals. However, slow waves can propagate on the tectorial membrane other than the basilar membrane. If the tectorial membrane waves also progress along the cochlea from the base to the apex, they could have influence on the signal that is transmitted by the basilar membrane wave. We discuss the difference of the propagation characteristics between two types of the tectorial membrane waves and the basilar membrane wave by comparing the attenuation constants. First, we showed the difference of the displacement of the basilar and tectorial membranes between these waves. Then, we investigated their propagation characteristics including the phase constants and attenuation constants. Finally, we studied the structural dependence of the attenuation constants of the tectorial membrane waves.","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":"70177653","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}
引用次数: 0
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