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Review of Geoacoustic Inversion in Underwater Acoustics 水声地球声反演研究进展
IF 1.9 3区 物理与天体物理
Journal of Theoretical and Computational Acoustics Pub Date : 2021-07-27 DOI: 10.1142/s259172852130004x
N. Chapman, E. Shang
{"title":"Review of Geoacoustic Inversion in Underwater Acoustics","authors":"N. Chapman, E. Shang","doi":"10.1142/s259172852130004x","DOIUrl":"https://doi.org/10.1142/s259172852130004x","url":null,"abstract":"","PeriodicalId":55976,"journal":{"name":"Journal of Theoretical and Computational Acoustics","volume":"36 1","pages":""},"PeriodicalIF":1.9,"publicationDate":"2021-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76139082","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: 10
A Modified Helmholtz Equation Least Squares Method for Reconstructing Vibroacoustic Quantities on an Arbitrarily Shaped Vibrating Structure 基于修正Helmholtz方程最小二乘的任意形状振动结构振动声量重建方法
IF 1.9 3区 物理与天体物理
Journal of Theoretical and Computational Acoustics Pub Date : 2021-06-24 DOI: 10.1142/s2591728521500067
Lingguang Chen, Sean F. Wu
{"title":"A Modified Helmholtz Equation Least Squares Method for Reconstructing Vibroacoustic Quantities on an Arbitrarily Shaped Vibrating Structure","authors":"Lingguang Chen, Sean F. Wu","doi":"10.1142/s2591728521500067","DOIUrl":"https://doi.org/10.1142/s2591728521500067","url":null,"abstract":"A modified Helmholtz equation least-square (HELS) method is developed to reconstruct vibroacoustic quantities on an arbitrarily shaped vibrating structure. Unlike the traditional nearfield acoustical holography that relies on the acoustic pressures collected on a hologram surface at a short stand-off distance to a target structure, this modified HELS method takes the partial normal surface velocities and partial acoustic pressures as the input data. The advantages of this approach include but not limited to: (1) The normal surface velocities that represent the nearfield effects are collected directly, which lead to a more accurate reconstruction of the normal surface velocity distribution; (2) The field acoustic pressures are also measured, which leads to a more accurate reconstruction of the acoustic pressure on the source surface as well as in the field; and (3) There is no need to measure the normal surface velocities over the entire surface, which makes this approach quite appealing in practice because most vibrating structures do not allow for measuring the normal surface velocities over the entire source surface as there are always obstacles or constrains around a target structure. Needless to say, regularization is necessary in reconstruction process since all inverse problems are mathematically ill-posed. To validate this approach, both numerical simulations and experimental results are presented. An optimal reconstruction scheme is developed via numerical simulations to achieve the most cost-effective reconstruction results for practical applications.","PeriodicalId":55976,"journal":{"name":"Journal of Theoretical and Computational Acoustics","volume":"19 1","pages":""},"PeriodicalIF":1.9,"publicationDate":"2021-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75525698","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: 2
Research on the Optimization Design of the Acoustic Stealth Shape of a Bottom Object 水下目标声隐身形状优化设计研究
IF 1.9 3区 物理与天体物理
Journal of Theoretical and Computational Acoustics Pub Date : 2021-06-15 DOI: 10.1142/s2591728521500092
Bing Li, Fulin Zhou, Jun Fan, Bin Wang, Zilong Peng
{"title":"Research on the Optimization Design of the Acoustic Stealth Shape of a Bottom Object","authors":"Bing Li, Fulin Zhou, Jun Fan, Bin Wang, Zilong Peng","doi":"10.1142/s2591728521500092","DOIUrl":"https://doi.org/10.1142/s2591728521500092","url":null,"abstract":"This paper presents an optimal design method for the acoustic stealth shape for a bottom object with relatively lower echo strength (ES), based on the physical acoustics method (PAM) and genetic algorithm (GA). Specifically, the performance of the PAM was evaluated with acoustic scattering from a Manta-like object, using two-dimensional (2D) axisymmetric calculation method. In the optimization method, GA, the object shape represented by the Bernstein polynomial, grid topology acquired by using the MATLAB-COMSOL module and the scattering calculation are combined into a process. The optimization objective function is given as the weighting function of the ES of the bottom object with different grazing angles and frequencies. Finally, the two optimal shapes of the bottom object under different conditions are given, in which the ES and the angle detection rate after optimization are greatly reduced. This optimal method provides guidance for the lower ES shape design of bottom targets.","PeriodicalId":55976,"journal":{"name":"Journal of Theoretical and Computational Acoustics","volume":"34 1","pages":""},"PeriodicalIF":1.9,"publicationDate":"2021-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76351738","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
A Mixed Finite Element-Based Numerical Method for Elastodynamics Considering Adhesive Interface Damage for Dynamic Fracture 基于混合有限元的动态断裂粘接界面损伤弹性动力学数值计算方法
IF 1.9 3区 物理与天体物理
Journal of Theoretical and Computational Acoustics Pub Date : 2021-06-01 DOI: 10.1142/s2591728521500109
C. Panagiotopoulos, C. Tsogka
{"title":"A Mixed Finite Element-Based Numerical Method for Elastodynamics Considering Adhesive Interface Damage for Dynamic Fracture","authors":"C. Panagiotopoulos, C. Tsogka","doi":"10.1142/s2591728521500109","DOIUrl":"https://doi.org/10.1142/s2591728521500109","url":null,"abstract":"The numerical solution of the elastodynamic problem with kinematic boundary conditions is considered using mixed finite elements for the space discretization and a staggered leap-frog scheme for the discretization in time. The stability of the numerical scheme is shown under the usual CFL condition. Using the general form of Robin-type boundary conditions some cases of debonding and the resulting acoustic emission are studied. The methodology presented finds applications to geophysics such as in seismic waves simulation with dynamic rupture and energy release. In this paper, we focus on problems of fracture occurring at the interface of composite materials. Our goal is to study both the mechanism of crack initiation and propagation, as well as the acoustic emission of the released structure-borne energy which may be used in structural health monitoring and prognosis applications.","PeriodicalId":55976,"journal":{"name":"Journal of Theoretical and Computational Acoustics","volume":"48 1","pages":""},"PeriodicalIF":1.9,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79158776","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
Saddle Point Method for Transient Processes in Waveguides 波导瞬态过程的鞍点法
IF 1.9 3区 物理与天体物理
Journal of Theoretical and Computational Acoustics Pub Date : 2021-03-11 DOI: 10.1142/s2591728521500183
A. Shanin, A. I. Korolkov, K. S. Kniazeva
{"title":"Saddle Point Method for Transient Processes in Waveguides","authors":"A. Shanin, A. I. Korolkov, K. S. Kniazeva","doi":"10.1142/s2591728521500183","DOIUrl":"https://doi.org/10.1142/s2591728521500183","url":null,"abstract":"A modification of the saddle point method is proposed for computation of nonstationary wave processes (pulses) in waveguides. The dispersion diagram of the waveguide is continued analytically. A set of possible saddle points on the dispersion diagram is introduced. A method of checking whether the particular saddle points contribute terms to the field decomposition is proposed. A classification of the waveguides based on the topology of the set of possible saddle points is outlined.","PeriodicalId":55976,"journal":{"name":"Journal of Theoretical and Computational Acoustics","volume":"28 1","pages":""},"PeriodicalIF":1.9,"publicationDate":"2021-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90997286","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
Author Index Volume 28 (2020) 作者索引第28卷(2020)
IF 1.9 3区 物理与天体物理
Journal of Theoretical and Computational Acoustics Pub Date : 2020-12-01 DOI: 10.1142/s2591728520990017
{"title":"Author Index Volume 28 (2020)","authors":"","doi":"10.1142/s2591728520990017","DOIUrl":"https://doi.org/10.1142/s2591728520990017","url":null,"abstract":"","PeriodicalId":55976,"journal":{"name":"Journal of Theoretical and Computational Acoustics","volume":"8 1","pages":""},"PeriodicalIF":1.9,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79372480","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
Stoneley wave velocity variation 斯通利波速变化
IF 1.9 3区 物理与天体物理
Journal of Theoretical and Computational Acoustics Pub Date : 2020-11-30 DOI: 10.1142/s2591728520500309
S. Kuznetsov
{"title":"Stoneley wave velocity variation","authors":"S. Kuznetsov","doi":"10.1142/s2591728520500309","DOIUrl":"https://doi.org/10.1142/s2591728520500309","url":null,"abstract":"Stoneley wave velocity variation is analyzed by solving the modified Scholte secular equation for velocity of Stoneley waves, allowing to find dependency of the Stoneley wave velocity on the Wiechert parameter and construct a set of inequalities that confines region of existence for the appropriate root of the secular equation. Numerical analysis for Stoneley wave velocity dependence on the Wiechert parameter for both auxetics (materials with negative Poisson’s ratio) and nonauxetics revealed the presence of (i) asymptotes indicating degeneracy of Stoneley waves into the corresponding Rayleigh waves; and (ii) common extremums relating to degeneracy of Stoneley waves into the corresponding bulk shear waves.","PeriodicalId":55976,"journal":{"name":"Journal of Theoretical and Computational Acoustics","volume":"92 1","pages":""},"PeriodicalIF":1.9,"publicationDate":"2020-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86198497","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
Laser-Assisted Reconstruction of Vibro-Acoustic Behaviors of an Arbitrarily Shaped Vibrating Structure 任意形状振动结构的振动声特性激光辅助重建
IF 1.9 3区 物理与天体物理
Journal of Theoretical and Computational Acoustics Pub Date : 2020-09-01 DOI: 10.1142/S2591728519500117
Sean F. Wu, Lingguang Chen, Antonio Figueroa, Michael Telenko
{"title":"Laser-Assisted Reconstruction of Vibro-Acoustic Behaviors of an Arbitrarily Shaped Vibrating Structure","authors":"Sean F. Wu, Lingguang Chen, Antonio Figueroa, Michael Telenko","doi":"10.1142/S2591728519500117","DOIUrl":"https://doi.org/10.1142/S2591728519500117","url":null,"abstract":"This paper presents a new method known as laser-assisted, modified Helmholtz Equation Least Squares method-based reconstruction to determine vibro-acoustic quantities of an arbitrarily shaped vibrating structure subject to a noncontact acoustic excitation. Unlike the traditional near-field acoustical holography (NAH) that relies on the acoustic pressures measured in the near-field, this new methodology enables one to collect the input data at a remote distance by using a laser vibrometer, making measurement setup much easier than all previous NAH approaches. Most importantly, by measuring the normal components of the surface velocities at the accessible areas, one can acquire near-field information of a vibrating structure directly, rather than indirectly through reconstruction based on the acoustic pressures measured in the near field. To ensure the accuracy in reconstruction of all the vibro-acoustic characteristics of a structure, the acoustic pressures at a few points in space are also measured. By combining these partial input data, one can acquire a complete picture of the vibro-acoustic field of an arbitrarily shaped vibrating structure, which includes operation deflection shapes, distributions of the acoustic pressures and the normal component of the acoustic intensities on a source surface, and the time-averaged acoustic power of the structure. When the input power is specified, one may determine the frequency response functions, the natural modes, the structural damping ratios of the structure, sound transmission loss, sound transmission path, etc. Examples of using this technology to acquire an in-depth understanding of the vibro-acoustic characteristics of an automobile front dash panel are presented.","PeriodicalId":55976,"journal":{"name":"Journal of Theoretical and Computational Acoustics","volume":"17 1","pages":""},"PeriodicalIF":1.9,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74613031","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
Acoustic Shape Optimization Based on Isogeometric Wideband Fast Multipole Boundary Element Method with Adjoint Variable Method 基于伴随变量法等几何宽带快速多极边界元法的声形优化
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/S2591728520500152
Jie Wang, C. Zheng, Leilei Chen, Haibo Chen
{"title":"Acoustic Shape Optimization Based on Isogeometric Wideband Fast Multipole Boundary Element Method with Adjoint Variable Method","authors":"Jie Wang, C. Zheng, Leilei Chen, Haibo Chen","doi":"10.1142/S2591728520500152","DOIUrl":"https://doi.org/10.1142/S2591728520500152","url":null,"abstract":"A shape optimization approach based on isogeometric wideband fast multipole boundary element method (IGA WFMBEM) in 2D acoustics is developed in this study. The key treatment is shape sensitivity analysis by using the adjoint variable method under isogeometric analysis (IGA) conditions. A set of efficient parameters of the wideband fast multipole method has been identified for IGA boundary element method. Shape optimization is performed by applying the method of moving asymptotes. IGA WFMBEM is validated through an acoustic scattering example. The proposed optimization approach is tested on a sound barrier and two multiple structures to demonstrate its potential for engineering problems.","PeriodicalId":55976,"journal":{"name":"Journal of Theoretical and Computational Acoustics","volume":"16 1","pages":""},"PeriodicalIF":1.9,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83473882","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: 6
Estimation of Optimal Values for Lumped Elements in a Finite Element — Lumped Parameter Model of a Loudspeaker 扬声器有限元集总参数模型中集总单元最优值的估计
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/S2591728520500127
D. G. Nielsen, P. R. Andersen, Jakob S. Jensen, F. Agerkvist
{"title":"Estimation of Optimal Values for Lumped Elements in a Finite Element — Lumped Parameter Model of a Loudspeaker","authors":"D. G. Nielsen, P. R. Andersen, Jakob S. Jensen, F. Agerkvist","doi":"10.1142/S2591728520500127","DOIUrl":"https://doi.org/10.1142/S2591728520500127","url":null,"abstract":"Finite element methods are progressively being utilized to assist in the continuous development of loudspeakers. The core of this paper is the method of lumping certain parts of the finite element model, creating a significant reduction in the model complexity that allows for e.g. faster structural optimization. This is illustrated in the paper with a loudspeaker example where the electromagnetic parts are lumped as well as the spider. It is shown that the simplified model still matches the complex response of the full FE model at very high frequencies.","PeriodicalId":55976,"journal":{"name":"Journal of Theoretical and Computational Acoustics","volume":"49 1","pages":""},"PeriodicalIF":1.9,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87263450","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
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