Acoustics Australia最新文献_第6页

Low-Frequency Sound Absorption of an Inhomogeneous Micro-Perforated Panel with J-Shaped Cavities of Different Depths 不同深度j形空腔非均匀微孔板的低频吸声特性

IF 1.7 4区物理与天体物理

Acoustics Australia Pub Date : 2022-01-07 DOI: 10.1007/s40857-021-00261-2

Faisal Rafique, Jiu Hui Wu, Chong Rui Liu, Fuyin Ma

{"title":"Low-Frequency Sound Absorption of an Inhomogeneous Micro-Perforated Panel with J-Shaped Cavities of Different Depths","authors":"Faisal Rafique, Jiu Hui Wu, Chong Rui Liu, Fuyin Ma","doi":"10.1007/s40857-021-00261-2","DOIUrl":"10.1007/s40857-021-00261-2","url":null,"abstract":"<div><p>In this paper, a micro-perforated panel (MPP) composite structure consisting of an inhomogeneous MPP (IMPP) backed with J-shaped cavities of different depths for low-frequency sound absorption is proposed. The goal is to increase the low-frequency (≤ 500 Hz) sound absorption performance of the IMPP. Sound absorption in a frequency range of 300–480 Hz was achieved with parallel-arranged IMPPs backed by J-shaped cavities, with average absorption of greater than 90%. A parametric analysis was used to optimize the structure's geometric parameters for the specified frequency range. The results show that when the length and volume of the back cavity depths increase, the low-frequency sound absorption peaks shift to a lower frequency. Similarly, the sound absorption curves are enhanced and move towards lower frequencies as the thickness of the IMPP increases. The structure was studied using an electro-acoustic equivalent circuit model (ECM) and finite element method (FEM) simulation. Model prototypes were then made using stereolithography (SLA) and verified by a square-shaped impedance tube-based experimental study to determine the normal absorption coefficient. The results revealed that the three types of curves, namely theoretical, FEM simulation, and experimental, were in good agreement.</p></div>","PeriodicalId":54355,"journal":{"name":"Acoustics Australia","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2022-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50012859","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: 6

Forbidden Transmission of Broadband Duct Noise Realized by Compactly Placed Detuned Resonators 用紧凑布置的失谐谐振器实现宽带管道噪声的禁止传输

IF 1.7 4区物理与天体物理

Acoustics Australia Pub Date : 2021-12-03 DOI: 10.1007/s40857-021-00258-x

Jingwen Guo, Yi Fang, Xin Zhang

{"title":"Forbidden Transmission of Broadband Duct Noise Realized by Compactly Placed Detuned Resonators","authors":"Jingwen Guo, Yi Fang, Xin Zhang","doi":"10.1007/s40857-021-00258-x","DOIUrl":"10.1007/s40857-021-00258-x","url":null,"abstract":"<div><p>Effective broadband duct sound propagation control is highly required in many practical engineering applications. In this study, a compact structure constituted by multiple detuned resonators is proposed for broadband duct noise transmission control. The coupling characteristics of two detuned resonators flush-mounted on the sidewall of a duct are firstly investigated. Results show that a coherent perfect absorption (CPA) is induced when these two resonators are precisely designed. Meanwhile, a nearly flat transmission forbidden band is formed, which is very beneficial for duct noise control. Furthermore, it is found that the appearance of the forbidden band is insensitive to the distance between resonators. On this basis, a customized broadband CPA-based structure constructed by detuned resonators is developed, in which the geometric parameters of each adjacent resonator satisfying the CPA condition and the resonators are closely placed. By overlapping the forbidden band of adjacent resonators, a broad duct sound transmission forbidden band is attained. The acoustic performance of the proposed compact design is demonstrated experimentally.\u0000</p></div>","PeriodicalId":54355,"journal":{"name":"Acoustics Australia","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2021-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s40857-021-00258-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50009779","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence Analysis of Internal Solitary Wave on Towed Line Array Shape and Compensation Strategy 内孤立波对拖曳线阵形状的影响分析及补偿策略

IF 1.7 4区物理与天体物理

Acoustics Australia Pub Date : 2021-11-17 DOI: 10.1007/s40857-021-00253-2

Maofa Wang, Yibo Liu, Zefei Zhu, Dayong Peng, Huanhuan Xue, Youping Gong, Chuanping Zhou

{"title":"Influence Analysis of Internal Solitary Wave on Towed Line Array Shape and Compensation Strategy","authors":"Maofa Wang, Yibo Liu, Zefei Zhu, Dayong Peng, Huanhuan Xue, Youping Gong, Chuanping Zhou","doi":"10.1007/s40857-021-00253-2","DOIUrl":"10.1007/s40857-021-00253-2","url":null,"abstract":"<div><p>Due to the flexibility of the towed line array, shear currents caused by an internal solitary wave (ISW) distort the array shape. This will lead to a mismatch between the conventional target detection algorithm and the array shape, resulting in a significant decline in the performance of the towed line array gain, azimuth resolution, etc. Based on the improved motion model of towed cable constructed by Ablow and Schechter (Ocean Eng, 10: 443–457, 1983), we propose a motion model of the towed line array under an ISW according to the Korteweg-De Vries (KdV) equation and solve the model by finite difference method combined with the Newton iteration method. In addition, the DFT beamforming theory is used to detect the target signal after the array shape distortion compensation to verify the validity of the model. The data analysis shows that the array shape distortion caused by the ISW is mainly affected by the relative position between the array and the ISW, the amplitude of the ISW, the fluid layer density, the fluid layer depth, the towing velocity, the tangential/normal drag coefficient, the elastic modulus, and the towed cable density. The influence of elastic modulus and the towed cable density on array shape distortion can be ignored. The detection results show that the output signal power is about 6 dB higher than the output noise power, and the array gain and azimuth resolution are improved after array shape distortion compensation.</p></div>","PeriodicalId":54355,"journal":{"name":"Acoustics Australia","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2021-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50034929","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

Classifying Sound: A Tool to Enrich Intangible Heritage Management 声音分类:丰富非物质遗产管理的工具

IF 1.7 4区物理与天体物理

Acoustics Australia Pub Date : 2021-11-06 DOI: 10.1007/s40857-021-00257-y

Murray Parker, Dirk H. R. Spennemann

引用次数: 6

Acoustics Australia 声学澳大利亚

IF 1.7 4区物理与天体物理

Acoustics Australia Pub Date : 2021-10-13 DOI: 10.1007/s40857-021-00254-1

引用次数: 0

A Helmholtz Resonator-Based Acoustic Metamaterial for Power Transformer Noise Control 基于亥姆霍兹谐振腔的电力变压器噪声控制声学超材料

IF 1.7 4区物理与天体物理

Acoustics Australia Pub Date : 2021-10-07 DOI: 10.1007/s40857-021-00256-z

Naser Sharafkhani

引用次数: 6

Passage of Monochromatic Sound Through a Gas Pipeline Wall 单色声音通过燃气管道壁的通道

IF 1.7 4区物理与天体物理

Acoustics Australia Pub Date : 2021-09-29 DOI: 10.1007/s40857-021-00255-0

A. V. Lun-Fu, M. A. Bubenchikov, A. M. Bubenchikov, D. V. Mamontov

引用次数: 0

Noise Exposure and its Effects on the Hearing of Indoor Cycling Instructors 噪声暴露及其对室内自行车指导员听力的影响

IF 1.7 4区物理与天体物理

Acoustics Australia Pub Date : 2021-09-13 DOI: 10.1007/s40857-021-00251-4

Marcos Vinícius Soares Martins, Karina Mary de Paiva, Eriberto Oliveira do Nascimento, Bruno Sérgio Portela, Danúbia Hillesheim, Paulo Henrique Zannin

{"title":"Noise Exposure and its Effects on the Hearing of Indoor Cycling Instructors","authors":"Marcos Vinícius Soares Martins, Karina Mary de Paiva, Eriberto Oliveira do Nascimento, Bruno Sérgio Portela, Danúbia Hillesheim, Paulo Henrique Zannin","doi":"10.1007/s40857-021-00251-4","DOIUrl":"10.1007/s40857-021-00251-4","url":null,"abstract":"<div><p>To ascertain the influence of occupational exposure to SPL on the hearing threshold of indoor cycling (IC) instructors. This is a cross-sectional study involving eleven IC instructors at fitness centers in Guarapuava, PR, Brazil Questionnaires were applied to assess occupational characteristics and reported auditory and extra-auditory symptoms. The hearing threshold was evaluated by pure tone audiometry testing at seven moments: after 14 h of acoustic rest, and before and immediately after exposure to SPLs of 95, 85 and 75 dB(A), making a total of 77 measurements of the group of instructors. Differences in means were assessed using the Kruskal–Wallis test. The k-means and composition method was applied using principal component analysis to verify the main factors associated with the broadband multi-frequency measurement at the hearing threshold. The average bilateral hearing threshold showed a significant increase at the intensity of 95 dB(A), at all the tested frequencies (<i>p</i> < 0.05) and at most of the frequencies, at 85 dB(A). Conclusions exposure to the equivalent sound pressure levels of 85 dB(A) and 95 dB(A) significantly altered the average hearing threshold of indoor cycling instructors.</p></div>","PeriodicalId":54355,"journal":{"name":"Acoustics Australia","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2021-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50025068","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

Band Gap Mechanism and Design of a New Type of Six-Ligament Chiral Structure 一种新型六韧带手性结构的带隙机理及设计

IF 1.7 4区物理与天体物理

Acoustics Australia Pub Date : 2021-08-27 DOI: 10.1007/s40857-021-00249-y

Yajun Xin, Ran Wang, Yongtao Sun, Qian Ding, Shuliang Cheng

引用次数: 2

Enhanced wideband low-frequency sound absorption of a single-layer multiple parallel-arranged inhomogeneous microperforated panel absorber 单层多层并联非均匀微孔板吸声器的宽带低频吸声性能研究

IF 1.7 4区物理与天体物理

Acoustics Australia Pub Date : 2021-08-26 DOI: 10.1007/s40857-021-00252-3

Faisal Rafique, Jiu Hui Wu, Syed Murawat Abbas Naqvi, Fuyin Ma

{"title":"Enhanced wideband low-frequency sound absorption of a single-layer multiple parallel-arranged inhomogeneous microperforated panel absorber","authors":"Faisal Rafique, Jiu Hui Wu, Syed Murawat Abbas Naqvi, Fuyin Ma","doi":"10.1007/s40857-021-00252-3","DOIUrl":"10.1007/s40857-021-00252-3","url":null,"abstract":"<div><p>A single layer of four parallel-arranged inhomogeneous microperforated panels (iMPP) absorber is proposed to achieve low-frequency sound absorption and wider frequency bandwidth. The hole diameter of the four parallel-arranged iMPP is set to be equal to or less than 1 mm. The theoretical formula for calculating the absorption coefficient under normal incident sound is established based on an electrical equivalent circuit model (ECM). The parametric study has been performed on the MATLAB software, and the expected results are obtained. The results indicate that the proposed model can produce a wider absorption bandwidth of 195–455 Hz in the low-frequency region with an average absorption coefficient of more than 90% (<i>α</i> = 0.91). To achieve the desired effect, the absorption coefficient and the bandwidth can be tuned by adjusting the aperture size, perforation ratio, thickness of iMPP with depth and width of the back cavity. Also, it is found that iMPP can produce wider bandgaps with good absorption peaks in the low-frequency region by designing sub-MPP of smaller hole diameter, large perforation ratio, and with large cavity depths and the sub-MPP of large hole diameter, small perforation ratio, and with short cavity depths. The finite element method has been employed on COMSOL Multiphysics 5.5a to simulate the acoustic absorption performance of the model and compared with the ECM-based predicted and square impedance tube-based experimental results. Compared with other homogeneous MPPs of different arrangements, this absorber provides exceptional absorption performance in a low-frequency range due to its lightweight structure, and convenient manufacturing availability, this enhanced form of iMPP absorber has great potential in acoustics and noise control applications.</p></div>","PeriodicalId":54355,"journal":{"name":"Acoustics Australia","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2021-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50102889","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: 5