Journal of Theoretical and Computational Acoustics最新文献_第10页

Editorial: Special Issue on Recent Advances in Finite and Boundary Element Methods 社论:有限元和边界元方法最新进展特刊

IF 1.9 3区物理与天体物理

Journal of Theoretical and Computational Acoustics Pub Date : 2020-06-01 DOI: 10.1142/s2591728520020016

Haibo Chen, Weikang Jiang, S. Marburg, Haijun Wu

引用次数: 0

A Benchmark Study on Eigenfrequencies of Fluid-Loaded Structures 流载结构特征频率的基准研究

IF 1.9 3区物理与天体物理

Journal of Theoretical and Computational Acoustics Pub Date : 2020-06-01 DOI: 10.1142/s2591728520500139

F. Kronowetter, S. K. Baydoun, M. Eser, Lennart Moheit, S. Marburg

引用次数: 1

A Short Survey on Green’s Function for Acoustic Problems 浅谈格林函数在声学问题中的应用

IF 1.9 3区物理与天体物理

Journal of Theoretical and Computational Acoustics Pub Date : 2020-06-01 DOI: 10.1142/s2591728519500257

Augustus R. Okoyenta, Haijun Wu, Xueliang Liu, Weikang Jiang

{"title":"A Short Survey on Green’s Function for Acoustic Problems","authors":"Augustus R. Okoyenta, Haijun Wu, Xueliang Liu, Weikang Jiang","doi":"10.1142/s2591728519500257","DOIUrl":"https://doi.org/10.1142/s2591728519500257","url":null,"abstract":"Green’s functions for acoustic problems is the fundamental solution to the inhomogeneous Helmholtz equation for a point source, which satisfies specific boundary conditions. It is very significant for the integral equation and also serves as the impulse response of an acoustic wave equation. They are important for acoustic problems that involve the propagation of sound from the source point to the observer position. Once the Green’s function, which satisfies the necessary boundary conditions, is obtained, the sound pressure at any point away from the source can be easily calculated by the integral equation. The major problem faced by researchers is in the process of constructing these Green’s functions which satisfy a specific boundary condition. The aim of this work is to review some of these fundamental solutions available in the literature for different boundary conditions for the ease of analyzing acoustics problems. The review covers the free-space Green’s functions for stationary source and rotational source, for both when the observer and the acoustic medium are at rest and when the medium is in uniform flow. The half-space Green’s functions are also summarized for both stationary acoustic source and moving acoustic source, derived using the image source method, equivalent source method and complex equivalent method in both time domain and frequency domain. Each of these methods used depends on the different impedance boundary conditions for which the Green’s function will satisfy. Finally, enclosed spaced Green’s functions for both rectangular duct and cylindrical duct for an infinite and finite duct is also covered in the review.","PeriodicalId":55976,"journal":{"name":"Journal of Theoretical and Computational Acoustics","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87495552","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Pseudospectral Time-Domain (PSTD) Methods for the Wave Equation: Realizing Boundary Conditions with Discrete Sine and Cosine Transforms 波动方程的伪谱时域方法:用离散正弦和余弦变换实现边界条件

IF 1.9 3区物理与天体物理

Journal of Theoretical and Computational Acoustics Pub Date : 2020-05-01 DOI: 10.1142/s2591728520500218

Elliott S. Wise, J. Jaros, B. Cox, B. Treeby

{"title":"Pseudospectral Time-Domain (PSTD) Methods for the Wave Equation: Realizing Boundary Conditions with Discrete Sine and Cosine Transforms","authors":"Elliott S. Wise, J. Jaros, B. Cox, B. Treeby","doi":"10.1142/s2591728520500218","DOIUrl":"https://doi.org/10.1142/s2591728520500218","url":null,"abstract":"Pseudospectral time domain (PSTD) methods are widely used in many branches of acoustics for the numerical solution of the wave equation, including biomedical ultrasound and seismology. The use of the Fourier collocation spectral method in particular has many computational advantages. However, the use of a discrete Fourier basis is also inherently restricted to solving problems with periodic boundary conditions. Here, a family of spectral collocation methods based on the use of a sine or cosine basis is described. These retain the computational advantages of the Fourier collocation method but instead allow homogeneous Dirichlet (sound-soft) and Neumann (sound-hard) boundary conditions to be imposed. The basis function weights are computed numerically using the discrete sine and cosine transforms, which can be implemented using [Formula: see text] operations analogous to the fast Fourier transform. Practical details of how to implement spectral methods using discrete sine and cosine transforms are provided. The technique is then illustrated through the solution of the wave equation in a rectangular domain subject to different combinations of boundary conditions. The extension to boundaries with arbitrary real reflection coefficients or boundaries that are nonreflecting is also demonstrated using the weighted summation of the solutions with Dirichlet and Neumann boundary conditions.","PeriodicalId":55976,"journal":{"name":"Journal of Theoretical and Computational Acoustics","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2020-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81814434","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Kirchhoff Approximations for the Forward-Scattering Target Strength of Underwater Objects 水下目标前向散射强度的Kirchhoff近似

IF 1.9 3区物理与天体物理

Journal of Theoretical and Computational Acoustics Pub Date : 2020-03-01 DOI: 10.1142/s2591728519500087

Chuanlin He, Yi Zheng, Xu Xiang, Yuanliang Ma

{"title":"Kirchhoff Approximations for the Forward-Scattering Target Strength of Underwater Objects","authors":"Chuanlin He, Yi Zheng, Xu Xiang, Yuanliang Ma","doi":"10.1142/s2591728519500087","DOIUrl":"https://doi.org/10.1142/s2591728519500087","url":null,"abstract":"Kirchhoff approximations for the forward-scattering target strength of underwater objects are developed by combining Babinet’s principle and the Kirchhoff integral, where theoretical formulations and a numerical implementation are given in detail. The Kirchhoff approximation is found to be a high-frequency physical acoustic approximation. The forward-scattering target strength versus frequency and the spatial angles for spherical objects, prolate spheroids and the Benchmark Target Strength Simulation Submarine (BeTSSi-Sub) model are obtained by the Kirchhoff approximation and compared with results from theory, the deformed cylinder method (DCM) and the boundary element method (BEM). The Kirchhoff approximation shows considerable agreement with the theoretical and numerical approaches in a region of [Formula: see text] from the rigorous forward-scattering direction. The forward-scattered field contour and the corresponding directivity for the BeTSSi-Sub model are also calculated as a demonstration. Mode coupling caused by the simulated target is clearly revealed. The results indicate that the Kirchhoff approximation can predict the forward-scattering target strength of complex underwater objects.","PeriodicalId":55976,"journal":{"name":"Journal of Theoretical and Computational Acoustics","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2020-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89767753","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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: 3

Computation of Aeroacoustics and Fluid Flow Problems Using a Novel Dispersion Relation Preserving Scheme 用一种新的色散关系保持格式计算气动声学和流体流动问题

IF 1.9 3区物理与天体物理

Journal of Theoretical and Computational Acoustics Pub Date : 2020-03-01 DOI: 10.1142/S2591728518500639

B. Mahato, G. Naveen, Y. Bhumkar

{"title":"Computation of Aeroacoustics and Fluid Flow Problems Using a Novel Dispersion Relation Preserving Scheme","authors":"B. Mahato, G. Naveen, Y. Bhumkar","doi":"10.1142/S2591728518500639","DOIUrl":"https://doi.org/10.1142/S2591728518500639","url":null,"abstract":"A new spectrally optimized physical dispersion relation preserving scheme has been introduced to solve computational acoustics and aeroacoustics problems, accurately. The derived fourth-order accurate scheme has significant spectral resolution and physical dispersion relation preserving (DRP) nature. The scheme displays neutral stability at high CFL numbers. The developed scheme has an ability to add numerical diffusion as and when required to attenuate spurious waves present in the computed solutions. These features make the proposed scheme suitable for solving computational aeroacoustic problems. The scheme has been validated by comparing solutions of model computational acoustic problems with the available analytical solutions. Scheme has also been tested to solve the incompressible flow field around a circular cylinder executing rotary oscillations. Ability of the scheme to perform direct simulation of the computational aeroacoustic problems has been shown by computing acoustic field triggered by a laminar flow past a stationary circular cylinder. Excellent match has been observed between the present computed results and the available results in the literature which justifies applicability of the present DRP scheme to solve complex flow and aeroacoustic problems.","PeriodicalId":55976,"journal":{"name":"Journal of Theoretical and Computational Acoustics","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2020-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86086017","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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: 8

Gradient of the Cost Function Via the Adjoint Method for Underwater Acoustic Inversion 水声反演的伴随法代价函数梯度

IF 1.9 3区物理与天体物理

Journal of Theoretical and Computational Acoustics Pub Date : 2020-03-01 DOI: 10.1142/S2591728519500105

J. Papadakis, E. Karasmani

引用次数: 1

Temporal Coherence for Sound Transmission Through Fluctuating Deep Water with Adiabatic Perturbed Modes 具有绝热扰动模态的波动深水声传输的时间相干性

IF 1.9 3区物理与天体物理

Journal of Theoretical and Computational Acoustics Pub Date : 2020-03-01 DOI: 10.1142/S2591728519500014

Xiaotao Yu, Linhui Peng, Gaokun Yu

{"title":"Temporal Coherence for Sound Transmission Through Fluctuating Deep Water with Adiabatic Perturbed Modes","authors":"Xiaotao Yu, Linhui Peng, Gaokun Yu","doi":"10.1142/S2591728519500014","DOIUrl":"https://doi.org/10.1142/S2591728519500014","url":null,"abstract":"Adiabatic approximation (AP) combined with perturbation theory gives a fast normal-mode solution of temporal coherence for sound field in a two-dimensional deep water with time-varying random internal waves. Internal waves induced mode changes are deduced using the first-order perturbation theory [C. T. Tindle, L. M. O’Driscoll and C. J. Higham, Coupled mode perturbation theory of range dependence, J. Acoust. Soc. Am. 108(1) (2000) 76–83]. And mode perturbations in amplitude are neglected by the adiabatic method with wavenumber perturbations in phase merely considered. The AP expression of temporal coherence function is theoretically identical to the adiabatic transport equation theory [J. A. Colosi, T. K. Chandrayadula, A. G. Voronovich and V. E. Ostashev, Coupled mode transport theory for sound transmission through an ocean with random sound speed perturbations: Coherence in deep water environments, J. Acoust. Soc. Am. 134(4) (2013) 3119–3133]. Numerical results of the adiabatic temporal coherence function for several low frequencies and ranges up to 1000[Formula: see text]km are calculated. Then the coherence time scales obtained from the calculations are examined by a one-way coupled theory considering forward scattering [A. G. Voronovich, V. E. Ostashev and J. A. Colosi, Temporal coherence of acoustic signals in a fluctuating ocean, J. Acoust. Soc. Am. 129(6) (2011) 3590–3597]. Comparisons demonstrate that the range and frequency dependence of coherence time for both methods are quite close. And this shows good agreement with the well-known inverse frequency and inverse square root range laws. In addition, the internal wave energy dependence of coherence time is also studied.","PeriodicalId":55976,"journal":{"name":"Journal of Theoretical and Computational Acoustics","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2020-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84198300","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 Modal Intensity Distribution Estimation Algorithm Based on Horizontal Circular Array 一种基于水平圆形阵列的模态强度分布估计算法

IF 1.9 3区物理与天体物理

Journal of Theoretical and Computational Acoustics Pub Date : 2020-03-01 DOI: 10.1142/S2591728519500063

Li Peng, Zhang Xinhua, Liu Bing, Li Lan-rui, Li Jun

引用次数: 0

Approximating Ocean Acoustic Fields with Finite Basis Function Series for Autonomous Vehicle Applications 基于有限基函数序列的海洋声场近似自动驾驶汽车

IF 1.9 3区物理与天体物理

Journal of Theoretical and Computational Acoustics Pub Date : 2020-03-01 DOI: 10.1142/S2591728519500026

Caitlin C. Bogdan, S. Grace, J. McDaniel

{"title":"Approximating Ocean Acoustic Fields with Finite Basis Function Series for Autonomous Vehicle Applications","authors":"Caitlin C. Bogdan, S. Grace, J. McDaniel","doi":"10.1142/S2591728519500026","DOIUrl":"https://doi.org/10.1142/S2591728519500026","url":null,"abstract":"Algorithms that enable acoustic sensing vehicles to autonomously map acoustic fields are being developed, but some require an analytical representation of the data collected from the acoustic field with specific continuity properties. One optimal control technique that has these requirements and has been used in autonomous acoustic sensing algorithms is Pontryagin’s Maximum Principle (PMP). Given that most real-world fields are modeled by numerical methods, the need to create continuous analytical representations from data is a hurdle in realistic applications of these autonomous algorithms. In this work, finite series of basis functions are used to solve this problem. The basis functions are selected to meet the criteria of the PMP, and are used to approximate the field from the data collected. While this approach meets the criteria of the algorithm, it can be a computationally expensive approach for complex fields and large datasets. This paper looks at the trade off between accuracy and computational time, for different frequencies and levels of field complexity. A previously published ocean profile developed from data taken off the island of Elba is used in the normal mode software, Kraken, to generate the acoustic fields used to test this method. The candidate basis functions considered are trigonometric functions analogous to finite Fourier series, and Legendre polynomials. The Legendre polynomials are shown to have higher accuracy when used with a dynamically selected exclusion range at low frequencies and a cubic spline interpolation method for generating intermediate data points at higher frequencies. Run times are calculated and while both candidate basis functions are shown to meet the requirements of the PMP algorithm, the Legendre polynomials require the least amount of run time.","PeriodicalId":55976,"journal":{"name":"Journal of Theoretical and Computational Acoustics","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2020-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79959149","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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