Acoustics Australia最新文献

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IF 1.8 4区物理与天体物理

Acoustics Australia Pub Date : 2025-11-24 DOI: 10.1007/s40857-025-00363-1

引用次数: 0

Acoustic Black Hole Pillars for Noise Reduction in a Resonant Cavity Filled with Heavy Fluid 在充满重流体的谐振腔中用于降噪的声学黑洞柱

IF 1.8 4区物理与天体物理

Acoustics Australia Pub Date : 2025-10-16 DOI: 10.1007/s40857-025-00360-4

Junjun Li, Jie Deng, Oriol Guasch

引用次数: 0

Vibroacoustic Behaviour of a Fluid-Filled Baffled Cylindrical Shell Submerged in a Shallow-Water Waveguide 浸没在浅水波导中的充液折板圆柱壳的振动声特性

IF 1.8 4区物理与天体物理

Acoustics Australia Pub Date : 2025-10-16 DOI: 10.1007/s40857-025-00358-y

Jamie Kha, Mahmoud Karimi, Laurent Maxit

{"title":"Vibroacoustic Behaviour of a Fluid-Filled Baffled Cylindrical Shell Submerged in a Shallow-Water Waveguide","authors":"Jamie Kha, Mahmoud Karimi, Laurent Maxit","doi":"10.1007/s40857-025-00358-y","DOIUrl":"10.1007/s40857-025-00358-y","url":null,"abstract":"<div><p>An analytical method for predicting the forced vibroacoustic response of a fluid-filled baffled cylindrical shell submerged in a shallow-water waveguide is presented. The structural equations are governed by a thin shell theory that is decomposed into circumferential modes with a Fourier series and axial modes using a beam function. Heavy fluid fills the exterior and interior domains of the shell. The exterior fluid domain is further constrained by acoustic boundaries of an upper free surface and lower rigid bottom, which together form an ideal shallow-water waveguide. The acoustic boundaries are enforced by employing the image source method and Graf’s addition theorem which reconciles the differing coordinate systems of the many image sources that appear in the analytical expressions for the fluid–structure coupling. Vibroacoustic characteristics due to a mechanical point excitation on the surface of the shell or acoustic excitation from an internal monopole source and influence of different waveguide depths are investigated.</p></div>","PeriodicalId":54355,"journal":{"name":"Acoustics Australia","volume":"53 3","pages":"369 - 386"},"PeriodicalIF":1.8,"publicationDate":"2025-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s40857-025-00358-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145698815","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}

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Experimental Study on the Acoustic Scattering Characteristics and Classification of Typical Freshwater Fish and Crustacean Species 典型淡水鱼和甲壳类的声散射特性及分类实验研究

IF 1.8 4区物理与天体物理

Acoustics Australia Pub Date : 2025-09-27 DOI: 10.1007/s40857-025-00362-2

Jianbing Xiong, Fulin Zhou, Zhongkai Wang, Mingda Li, Jun Fan, Zilong Peng

{"title":"Experimental Study on the Acoustic Scattering Characteristics and Classification of Typical Freshwater Fish and Crustacean Species","authors":"Jianbing Xiong, Fulin Zhou, Zhongkai Wang, Mingda Li, Jun Fan, Zilong Peng","doi":"10.1007/s40857-025-00362-2","DOIUrl":"10.1007/s40857-025-00362-2","url":null,"abstract":"<div><p>This study investigates the acoustic scattering characteristics and classification of four freshwater species (<i>Channa argus</i>, <i>Oreochromis niloticus</i>, <i>Homarus americanus</i>, and <i>Pelodiscus sinensis</i>) using neural networks. Standard underwater acoustic measurements yield full-aspect horizontal scattering data from controlled tank experiments. Time-domain analysis extracts key echo features including highlight count, amplitude, time-delay differences, and pulse-width broadening, while Radon transform imaging reveals structure-scattering correlations. Frequency domain reveals interspecies differences in acoustic target strength by analyzing frequency-dependent scattering characteristics across different frequencies and incident angles. Statistical analysis demonstrates that the target strength distributions of the four freshwater species generally follow <span>(chi^{2})</span> patterns. Finally, we propose a classification method based on time–frequency-domain acoustic scattering characteristics of biological targets. A backpropagation neural network (BPNN) model incorporating these time–frequency-domain scattering characteristics achieves 95% classification accuracy. This study conducts neural network classification research based on multidimensional acoustic scattering characteristics of aquatic biological targets, extending the applications of acoustic technology in fisheries exploration and aquaculture industries. The work will provide new methodological insights for deep integration of neural networks with aquaculture practices.</p></div>","PeriodicalId":54355,"journal":{"name":"Acoustics Australia","volume":"53 3","pages":"403 - 417"},"PeriodicalIF":1.8,"publicationDate":"2025-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145698660","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

A Hybrid Computational Flow-Induced Noise and Phase-Conjugation Techniques for Low Reynolds Numbers 低雷诺数的混合计算流致噪声和相位共轭技术

IF 1.8 4区物理与天体物理

Acoustics Australia Pub Date : 2025-09-11 DOI: 10.1007/s40857-025-00361-3

Shubham Kumar, Akhilesh Mimani, Shashi Kumar, Yogesh G. Bhumkar

{"title":"A Hybrid Computational Flow-Induced Noise and Phase-Conjugation Techniques for Low Reynolds Numbers","authors":"Shubham Kumar, Akhilesh Mimani, Shashi Kumar, Yogesh G. Bhumkar","doi":"10.1007/s40857-025-00361-3","DOIUrl":"10.1007/s40857-025-00361-3","url":null,"abstract":"<div><p>This paper presents a framework comprising a hybrid computational flow-induced noise solver and finite-element-based phase-conjugation (PC) technique to analyze noise sources generated by bodies immersed in hydrodynamic flow fields at low Reynolds number (<i>Re</i>). The test-cases considered include a bluff and streamlined body, represented by a two-dimensional circular cylinder at <i>Re</i> = 150 and a NACA0012 airfoil at <i>Re</i> = 5000 oriented at <span>(text {5}^circ )</span> angle of attack, respectively. The hybrid computational flow-induced noise algorithm first resolves the hydrodynamic field using the unsteady pressure implicit splitting of operators (PISO) solver for incompressible Navier–Stokes (NS) equations, which delivers the near-field surface pressure fluctuations (SPF) that are used in the frequency-domain implementation of Curle’s analogy to predict the far-field noise. The vortex shedding plots, lift, and drag spectrum predicted by the PISO solver were in excellent agreement with the computationally expensive direct numerical simulations (DNS). The far-field sound directivity obtained using the SPF in Curle’s analogy and DNS-based prediction were in excellent agreement for the Aeolian tone, while for low-frequency tonal noise emitted from airfoil trailing edge (TE), Curle’s analogy prediction was only approximate. Next, using the boundary data obtained from the hybrid approach, PC was implemented to localize the flow-induced acoustic sources, whereby a pair of focal spots above and below the cylinder and TE revealed the dipole nature at the vortex shedding frequency. However, when the airfoil was modeled, cardioid-shaped focal spots were obtained between the mid-chord and TE due to diffraction of back-propagated waves delivering the reconstructed scattered source location.</p></div>","PeriodicalId":54355,"journal":{"name":"Acoustics Australia","volume":"53 3","pages":"341 - 367"},"PeriodicalIF":1.8,"publicationDate":"2025-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145698758","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

A Composite Sound Insulator Composed of a Helix and a Resonator Array 一种由螺旋和谐振器阵列组成的复合隔声体

IF 1.8 4区物理与天体物理

Acoustics Australia Pub Date : 2025-09-03 DOI: 10.1007/s40857-025-00359-x

Wenqing Diao, Ningwo Pei, Li Fan, Shuyi Zhang, Liping Cheng, Xiaodong Xu

引用次数: 0

Modeling the Vibroacoustic Behavior of Submerged Stiffened Cylindrical Shells Coupled to Non-axisymmetric Internal Structures and Excited by a Turbulent Boundary Layer 紊流边界层激励下与非轴对称内部结构耦合的水下加劲圆柱壳振动声特性建模

IF 1.8 4区物理与天体物理

Acoustics Australia Pub Date : 2025-08-24 DOI: 10.1007/s40857-025-00357-z

Valentin Meyer, Laurent Maxit

{"title":"Modeling the Vibroacoustic Behavior of Submerged Stiffened Cylindrical Shells Coupled to Non-axisymmetric Internal Structures and Excited by a Turbulent Boundary Layer","authors":"Valentin Meyer, Laurent Maxit","doi":"10.1007/s40857-025-00357-z","DOIUrl":"10.1007/s40857-025-00357-z","url":null,"abstract":"<div><p>Modeling the vibroacoustic behavior of structures excited by random pressure fields, such as turbulent boundary layers (TBL), is of interest for naval applications. Most works in the literature address the problem by considering periodically stiffened plates or shells. These studies have highlighted the role of Bloch–Floquet waves in increasing radiated pressure in certain frequency bands. However, in industrial applications, the stiffened structure excited by the TBL is generally coupled with internal structures such as bulkheads, floor partitions and engine foundations. To understand how these internal structures can modify the propagation of Bloch–Floquet waves and, consequently, the pressure radiated in the far field, it is necessary to have an efficient simulation tool. We propose developing a dedicated numerical process to estimate the radiated pressure from a cylindrical shell stiffened by axisymmetric/non-axisymmetric internal frames and excited by a homogeneous TBL. The process is based on the wavenumber-point reciprocity principle, which states that the sensitivity functions at a given point <i>M</i> correspond to the spectral responses of the system when excited by a monopole located at <i>M</i>. The condensed transfer functions approach is employed to derive these responses, thereby partitioning the problem: The immersed cylindrical shell is represented by an analytical model, whereas the internal frames are described using finite element models. Numerical results highlight a significant influence of the internal structure on the acoustic radiation of the stiffened shell in far field, induced by the coupling of the circumferential modes.</p></div>","PeriodicalId":54355,"journal":{"name":"Acoustics Australia","volume":"53 3","pages":"329 - 339"},"PeriodicalIF":1.8,"publicationDate":"2025-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145698497","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}

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News Item 新闻

IF 1.8 4区物理与天体物理

Acoustics Australia Pub Date : 2025-08-14 DOI: 10.1007/s40857-025-00356-0

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Analysis of Nonlinear Acoustic Vibrations of an Axially Moving Submerged Double-Walled Cylindrical Shell 水下双壁圆柱壳轴向运动非线性声振动分析

IF 1.8 4区物理与天体物理

Acoustics Australia Pub Date : 2025-07-11 DOI: 10.1007/s40857-025-00355-1

Amir Hossein Orafa, Mohammad Mahdi Jalili, Ali Reza Fotuhi

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Assessment of Urban Quiet Areas in the Context of Nature-Based Solutions: Istanbul Historical Peninsula Example 基于自然的解决方案背景下的城市安静区评估：伊斯坦布尔历史半岛的例子

IF 1.8 4区物理与天体物理

Acoustics Australia Pub Date : 2025-07-01 DOI: 10.1007/s40857-025-00353-3

Gülşen Akın Güler, Aslı Özçevik Bilen

{"title":"Assessment of Urban Quiet Areas in the Context of Nature-Based Solutions: Istanbul Historical Peninsula Example","authors":"Gülşen Akın Güler, Aslı Özçevik Bilen","doi":"10.1007/s40857-025-00353-3","DOIUrl":"10.1007/s40857-025-00353-3","url":null,"abstract":"<div><p>It has been emphasised in previous studies that the definition of quiet areas, which are specified as areas to be identified and protected in the Environmental Noise Directive (END) in force for European Member States, cannot be reduced to ‘the area below certain limit values for certain noise indicator values’ and the positive effects of the presence of natural elements such as natural sounds, plants and aquatic environment on the perception of quiet areas. Therefore, this soundscape study examines not only the levels of sound, but also how sound sources, the acoustic environment, auditory perception, and personal interpretation interact in shaping our experience of a sound environment. This study investigates the potential of quiet areas to be included within the scope of nature-based solutions (NBS) through the example of Istanbul Historic Peninsula. In this study, data were collected from selected urban open and green spaces within the Istanbul Historic Peninsula through noise mapping, in situ sound recordings, and questionnaire-based surveys, all conducted in accordance with established soundscape standards. The collected data were analysed to explore the relationships between the sound environment and various physical environmental factors that influence the perception of quietness in urban settings. These relationships were further evaluated within the framework of nature-based solutions (NBS) strategies, with a particular focus on how such quiet areas can contribute to urban greening practices. Finally, the study discusses how insights gained from the soundscape analysis can inform space planning and design in urban contexts, emphasising the integration of acoustic quality in green infrastructure planning.</p></div>","PeriodicalId":54355,"journal":{"name":"Acoustics Australia","volume":"53 2","pages":"269 - 284"},"PeriodicalIF":1.8,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s40857-025-00353-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144934668","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