Archives of Acoustics最新文献_第8页

Chronicle: Academician Leonid Maksimovich Brekhovskikh – 100th Anniversary of the Birth 纪事：列昂尼德·马克西莫维奇·布列霍夫斯基院士诞辰100周年

IF 0.9 4区物理与天体物理

Archives of Acoustics Pub Date : 2023-07-20 DOI: 10.24425/123926

A. Serebryany

引用次数: 0

In Memoriam: Docent Janusz Renowski 纪念:传教士Janusz Renowski

IF 0.9 4区物理与天体物理

Archives of Acoustics Pub Date : 2023-07-20 DOI: 10.24425/aoa.2022.141659

引用次数: 0

Research on Airflow Background Noise Suppression for Aeroacoustic Wind Tunnel Testing 气动声学风洞试验中气流背景噪声抑制研究

IF 0.9 4区物理与天体物理

Archives of Acoustics Pub Date : 2023-07-20 DOI: 10.24425/aoa.2022.141653

Li Yuanwen, LI Min, Daofang Feng, Debin Yang, Long Wei

{"title":"Research on Airflow Background Noise Suppression for Aeroacoustic Wind Tunnel Testing","authors":"Li Yuanwen, LI Min, Daofang Feng, Debin Yang, Long Wei","doi":"10.24425/aoa.2022.141653","DOIUrl":"https://doi.org/10.24425/aoa.2022.141653","url":null,"abstract":"The microphone data collected in aeroacoustic wind tunnel test contains not only desired aeroacoustic signal but also background noise generated by the jet or the valve of the wind tunnel, so the desired aeroacoustic characteristics is difficult to be highlighted due to the low Signal-to-Noise Ratio (SNR). Classical cross spectral matrix removal can only reduce the microphone self-noise, but its effect is limited for jet noise. Therefore, an Airflow Background Noise Suppression method based on the Ensemble Empirical Mode Decomposition (ABNSEEMD) is proposed to eliminate the influence of background noise on aeroacoustic field reconstruction. The new method uses EEMD to adaptively separate the background noise in microphone data, which has good practicability for increasing SNR of aeroacoustic signal. A localization experiment was conducted by using two loudspeakers in wind tunnel with 80 m/s velocity. Results show that proposed method can filter out the background noise more effectively and improve the SNR of the loudspeakers signal compared with spectral subtraction and cepstrum methods. Moreover, the aeroacoustic field produced by a NACA EPPLER 862 STRUT airfoil model was also measured and reconstructed. Delay-and-sum beamforming maps of aeroacoustic source were displayed after the background noise was suppressed, which further demonstrates the proposed method’s advantage.","PeriodicalId":8149,"journal":{"name":"Archives of Acoustics","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41547280","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

In memoriam - prof. Krzysztof Marasek (1958–2019)

IF 0.9 4区物理与天体物理

Archives of Acoustics Pub Date : 2023-07-20 DOI: 10.24425/AOA.2020.132493

Ryszard Gubrynowicz

引用次数: 0

Reflection and Transmission of Plane Wave at an Interface Between Two Rotating Micropolar Piezoelectric Solid Half-Spaces 平面波在两个旋转微电极压电固体半空间界面上的反射和透射

IF 0.9 4区物理与天体物理

Archives of Acoustics Pub Date : 2023-07-20 DOI: 10.24425/aoa.2021.138155

Baljeet Singh, A. Sangwan, J. Singh

引用次数: 1

Evaluation of Noise Pollution in Bengaluru City, India During COVID-19 Pandemic 2019冠状病毒病大流行期间印度班加罗尔市噪声污染评价

IF 0.9 4区物理与天体物理

Archives of Acoustics Pub Date : 2023-07-20 DOI: 10.24425/aoa.2022.141644

S. Anjum, A. Kumari

{"title":"Evaluation of Noise Pollution in Bengaluru City, India During COVID-19 Pandemic","authors":"S. Anjum, A. Kumari","doi":"10.24425/aoa.2022.141644","DOIUrl":"https://doi.org/10.24425/aoa.2022.141644","url":null,"abstract":"Most of the Indian cities and towns have been facing serious traffic noise pollution due to urbanization, substantial growth of new vehicles, inadequate road network, etc. Automotive traffic, railroads, and air traffic are the most common sources of noise pollution in cities, with vehicular traffic accounting for around 55% of overall metropolitan noise. Prolonged exposure to such loud noise causes anger, stress, mental diseases, discomfort, hypertension, concentration problems, and sleeplessness. This study aims to investigate the effects of COVID-19 societal lockdown on changes in the noise pollution levels before, during, and after the lockdown period in various industrial, commercial, residential, and silence zones in Bengaluru, India, in light of the recent imposition of COVID-19 societal lockdown. According to data acquired from the KSPCB (Karnataka State Pollution Control Board) online portal, the average noise levels before and during lockdown were determined to be in the range of 59.4 dB to 70.9 dB and 58.2 dB to 62.7 dB for different zones. During the lockdown, all commercial, industrial and educational activities were closed to limit the spread of infection, resulting in usage of private and commercial transportation declining dramatically. Reduction in the noise level was observed during the lockdown in all monitoring stations of Bengaluru, except for Indira Gandhi Institute of Child Health, where the noise level didn???t decline because of a COVID emergency. Maximum reduction was observed in the commercial area (11.56%) followed by industrial areas (8.34%). The result further indicated that only the industrial area experienced an increase of 8.41% in noise level, while other areas experienced a reduction in a noise level during the early post-lockdown. During the mid and late post-lockdown periods, most locations experienced a rapid spike in the noise intensity.","PeriodicalId":8149,"journal":{"name":"Archives of Acoustics","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45615736","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Design Sensitivity Studies on a Hydroacoustic Projector Using an Experimentally Validated Easy-to-Build Model 用实验验证的易于构建的模型研究水声投影仪的设计灵敏度

IF 0.9 4区物理与天体物理

Archives of Acoustics Pub Date : 2023-07-20 DOI: 10.24425/aoa.2022.140737

Vattaparambil Sreedharan, Nachiketa Tiwari

{"title":"Design Sensitivity Studies on a Hydroacoustic Projector Using an Experimentally Validated Easy-to-Build Model","authors":"Vattaparambil Sreedharan, Nachiketa Tiwari","doi":"10.24425/aoa.2022.140737","DOIUrl":"https://doi.org/10.24425/aoa.2022.140737","url":null,"abstract":"Hydroacoustic projectors are useful for generating low frequency sounds in water. Existing works on hydroa-coustic projectors require two signiﬁcant enhancements, especially for designers. First, we need to understand the inﬂuence of important projector design parameters on its performance. Such insights can be very useful in developing a compact and eﬃcient projector. Second, there is a need for an integrated model of the projector based on easily available and user-friendly numerical tools which do not require development of complex customised mathematical analogs of projector components. The present work addresses both such needs. Towards these goals, an experimentally validated, easy-to-build projector model was developed and used to conduct design sensitivity studies. We show that reductions in pipe compliance and air content in oil, and an increase in oriﬁce discharge coeﬃcient can yield remarkable improvements in projector’s SPL. We also show that reductions in pipe length and cylinder diameter cause moderate improvements in performance in mass and stiﬀness controlled regions, respectively. In contrast, the projector performance is insensitive to changes in pistonic mass, cylinder length, and diaphragm stiﬀness. Finally, we report that while pipe compliance and air content in oil can sharply alter system resonance, the eﬀects of changes in pipe length and pistonic mass on it are moderate in nature.","PeriodicalId":8149,"journal":{"name":"Archives of Acoustics","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46706886","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

47th Winter School on Wave and Quantum Acoustics XLVIth Winter School on Environmental Acoustics and Vibroacoustics Szczyrk, Poland, February 26 – March 1/2, 2018 2018年2月26日至3月1/2日，波兰Szczyrk，环境声学和振动声学冬季学校

IF 0.9 4区物理与天体物理

Archives of Acoustics Pub Date : 2023-07-20 DOI: 10.24425/122381

F. Witos

引用次数: 0

Professors Marianna Sankiewicz-Budzynski and Gustaw K.E. Budzynski Founders of the Polish Audio Engineering Marianna Sankiewicz-Budzynski和Gustaw K.E. Budzynski教授是波兰音频工程的创始人

IF 0.9 4区物理与天体物理

Archives of Acoustics Pub Date : 2023-07-20 DOI: 10.24425/123907

A. Czyżewski, B. Kostek

引用次数: 0

Energy analysis of cavitation bubbles under dual-frequency acoustic excitation 双频声激励下空化气泡的能量分析

IF 0.9 4区物理与天体物理

Archives of Acoustics Pub Date : 2023-07-20 DOI: 10.24425/aoa.2022.142898

Lv Liang, Hu Kai, Fei Liu, L. Yawei, B. Cui

{"title":"Energy analysis of cavitation bubbles under dual-frequency acoustic excitation","authors":"Lv Liang, Hu Kai, Fei Liu, L. Yawei, B. Cui","doi":"10.24425/aoa.2022.142898","DOIUrl":"https://doi.org/10.24425/aoa.2022.142898","url":null,"abstract":"Cavitation has been widely used in wastewater degradation, material synthesis and biomedical ﬁeld under dual-frequency acoustic excitation. The applications of cavitation are closely related to the power (i.e. the rate of internal energy accumulation) during bubble collapse. The Keller–Miksis equation considering liquid viscosity, surface tension and liquid compressibility is used to describe the radial motion of the bubble. The model is built in predicting the power during bubble collapse under dual-frequency acoustic excitation. The inﬂuences of parameters (i.e. phase diﬀerence, frequency diﬀerence, and amplitude ratio) on the power are investigated numerically. With the increase of phase diﬀerence, the power can be ﬂuctuated in a wide range at all conditions. Three typical characteristics of the power appear under the eﬀects of frequency diﬀerence and amplitude ratio. With the increase of amplitude ratio, if the frequency diﬀerence is small, the power has two maximum values; and if the frequency diﬀerence is medium, there is a maximum value. Otherwise, the power monotonously decreases. The results can provide theoretical references for the selections of experimental parameters of sono-luminescence and sonochemistry in the dual-frequency acoustic ﬁeld.","PeriodicalId":8149,"journal":{"name":"Archives of Acoustics","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45055708","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1