Journal of Computational Acoustics最新文献_第4页

More Than Six Elements Per Wavelength: The Practical Use of Structural Finite Element Models and Their Accuracy in Comparison with Experimental Results 每波长超过六个元素：结构有限元模型的实际应用及其与实验结果的精度比较

Journal of Computational Acoustics Pub Date : 2017-03-28 DOI: 10.1142/S0218396X17500254

P. Langer, M. Maeder, C. Guist, M. Krause, S. Marburg

{"title":"More Than Six Elements Per Wavelength: The Practical Use of Structural Finite Element Models and Their Accuracy in Comparison with Experimental Results","authors":"P. Langer, M. Maeder, C. Guist, M. Krause, S. Marburg","doi":"10.1142/S0218396X17500254","DOIUrl":"https://doi.org/10.1142/S0218396X17500254","url":null,"abstract":"Choosing the right number and type of elements in modern commercial finite element tools is a challenging task. It requires a broad knowledge about the theory behind or much experience by the user. Benchmark tests are a common method to prove the element performance against analytical solutions. However, these tests often analyze the performance only for single elements. When investigating the complete mesh of an arbitrary structure, the comparison of the element’s performance is quite challenging due to the lack of closed or fully converged solutions. The purpose of this paper is to show a high-precision comparison of eigenfrequencies of a real structure between experimental and numerical results in the context of an element performance check with respect to a converged solution. Additionally, the authors identify the practically relevant accuracy of simulation and experiment. Finally, the influence of accuracy with respect to the number of elements per standing structural bending wave is shown.","PeriodicalId":54860,"journal":{"name":"Journal of Computational Acoustics","volume":"25 1","pages":"1750025"},"PeriodicalIF":0.0,"publicationDate":"2017-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1142/S0218396X17500254","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43737463","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: 50

Review: The Use of Equivalent Source Method in Computational Acoustics 综述:等效声源法在计算声学中的应用

Journal of Computational Acoustics Pub Date : 2017-03-28 DOI: 10.1142/S0218396X16300012

Seongkyu Lee

{"title":"Review: The Use of Equivalent Source Method in Computational Acoustics","authors":"Seongkyu Lee","doi":"10.1142/S0218396X16300012","DOIUrl":"https://doi.org/10.1142/S0218396X16300012","url":null,"abstract":"This paper reviews the equivalent source method (ESM), an attractive alternative to the standard boundary element method (BEM). The ESM has been developed under different names: method of fundamental solutions, wave superposition method, equivalent source method, etc. However, regardless of the method name, the basic concept is very similar; that is to use auxiliary points called equivalent sources to reconstruct the acoustic pressure for radiation or scattering problems. The strength of the equivalent sources are then determined via various approaches such that the boundary conditions on the boundary surface are satisfied. This paper reviews several frequency-domain and time-domain ESMs. There are several distinct advantages in these types of methods: (1) the method is a meshless approach so that it is easy and simple to implement; (2) it does not have a numerical singularity problem that occurs in the BEM; (3) the number of equivalent sources can be fewer than the number of surface collocation points so that the matrix size is reduced and a fast computation is achieved for large problems. The main issue of the ESM is that there is no rule to find out the optimal number and position of equivalent sources. In addition, the ESM suffers from the numerical instability that is associated with the ill-conditioned matrix. Some guidelines have been suggested in terms of finding the number and position of the sources, and several numerical techniques have been developed to resolve the numerical instability. This paper reviews the common theories, numerical issues and challenges of the ESM, and it summarizes recent developments and applications of the ESM to aircraft noise.","PeriodicalId":54860,"journal":{"name":"Journal of Computational Acoustics","volume":"25 1","pages":"1630001"},"PeriodicalIF":0.0,"publicationDate":"2017-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1142/S0218396X16300012","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45821387","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: 41

Improved Integral Formulation for Acoustic Radiation Using Integral Equation of Frequency Averaged Quadratic Pressure 利用频率平均二次压力积分方程改进声辐射积分公式

Journal of Computational Acoustics Pub Date : 2017-03-28 DOI: 10.1142/S0218396X17500047

Hong-sheng Gao, Sheng Li

引用次数: 1

Numerical Analysis of One-Dimensional Sound Propagation Through a Duct Containing Water Droplets 含水滴管道中一维声传播的数值分析

Journal of Computational Acoustics Pub Date : 2017-03-28 DOI: 10.1142/S0218396X1650017X

Ersen Arslan, Yusuf Özyörük, M. Çaliskan

引用次数: 2

This Submission is for Special Issue on Underwater Acoustics: Perfectly Matched Layer Technique for Parabolic Equation Models in Ocean Acoustics 这篇文章是为《水下声学:海洋声学中抛物方程模型的完美匹配层技术》的特刊而提交的

Journal of Computational Acoustics Pub Date : 2017-03-28 DOI: 10.1142/S0218396X16500211

Chuanxiu Xu, S. Piao, Shie Yang, Haigang Zhang, Li Li

{"title":"This Submission is for Special Issue on Underwater Acoustics: Perfectly Matched Layer Technique for Parabolic Equation Models in Ocean Acoustics","authors":"Chuanxiu Xu, S. Piao, Shie Yang, Haigang Zhang, Li Li","doi":"10.1142/S0218396X16500211","DOIUrl":"https://doi.org/10.1142/S0218396X16500211","url":null,"abstract":"In ocean waveguides, the ocean bottom is usually approximated as a half-space. Thus, there exist no reflection waves at the half-space bottom and condition of radiation at infinity should be satisfied. In numerical solutions like parabolic equation methods, the depth domain has to be truncated, which can generate reflection waves from the truncated ocean bottom. To reduce the effect of reflection waves and to simulate an unbounded ocean bottom accurately, an artificial absorbing layer (ABL) was used. As was demonstrated, an ABL meets well the demand of accuracy in sound field calculation. However, both the sea-bottom layer and the artificial absorbing layer are needed to be set quite thick by using an ABL technique. Fortunately, a PML with several wavelengths can keep similar calculation accuracy with an ABL with dozens of wavelengths. In this paper, perfectly matched layer (PML) techniques for three parabolic equation (PE) models RAM, RAMS and a three-dimensional PE model in underwater acoustics are presented. A key technique of PML “complex coordinate stretching” is used to truncate unbounded domains and to simulate infinity radiation conditions instead of the ABL in those models. The numerical results illustrate that the PML technique is of higher efficiency than the ABL technique at truncating the infinity domain with minimal spurious reflections in PE models.","PeriodicalId":54860,"journal":{"name":"Journal of Computational Acoustics","volume":"25 1","pages":"1650021"},"PeriodicalIF":0.0,"publicationDate":"2017-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1142/S0218396X16500211","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43326971","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: 5

An Adjoint Operator Approach for Sensitivity Analysis of Radiated Sound Power in Fully Coupled Structural-Acoustic Systems 全耦合结构声系统辐射声功率灵敏度分析的伴随算子法

Journal of Computational Acoustics Pub Date : 2017-03-28 DOI: 10.1142/S0218396X17500035

Leilei Chen, S. Marburg, Haibo Chen, Hao Zhang, H. Gao

引用次数: 33

Modeling of Propagation of Antiplane Acoustic Waves in Multiscale Media with Lognormal Distribution of Parameters 反平面声波在多尺度介质中传播的参数对数正态分布建模

Journal of Computational Acoustics Pub Date : 2017-03-28 DOI: 10.1142/S0218396X17500072

O. Soboleva

引用次数: 1

Influence of Sound Speed Profile on Source Localization at Different Depths 声速剖面对不同深度震源定位的影响

Journal of Computational Acoustics Pub Date : 2017-03-27 DOI: 10.1142/S0218396X17500266

Lin Su, Li Ma, Shengming Guo

引用次数: 4

Enhanced Sound Beam from a Sonic Crystal Waveguide via a Self-Collimating Sonic Crystal 自准直声波晶体增强声波晶体波导的声束

Journal of Computational Acoustics Pub Date : 2017-03-16 DOI: 10.1142/S0218396X17500242

Jinfu Liang, Lun-Xun Gong

引用次数: 0

Investigation of Sea Surface Effect on Shallow Water Reverberation by Coupled Mode Method 耦合模式法研究海面对浅水混响的影响

Journal of Computational Acoustics Pub Date : 2017-03-16 DOI: 10.1142/S0218396X17500175

Bo Gao, Ning Wang, H. Wang

引用次数: 3