Journal of Computational Acoustics最新文献

Diffusion Equation-Based Finite Element Modeling of a Monumental Worship Space 基于扩散方程的纪念性礼拜空间有限元建模

Journal of Computational Acoustics Pub Date : 2017-11-21 DOI: 10.1142/S0218396X17500291

Zühre Sü Gül, N. Xiang, M. Çaliskan

引用次数: 8

Acoustic Imaging with Compressed Sensing and Microphone Arrays 声学成像与压缩传感和麦克风阵列

Journal of Computational Acoustics Pub Date : 2017-11-21 DOI: 10.1142/S0218396X17500278

Fangli Ning, Yong Liu, Chao Zhang, Jingang Wei, Xudong Shi, Juan Wei

引用次数: 3

A numerical model of an acoustic metamaterial using the boundary element method including viscous and thermal losses 用边界元法建立了包含粘滞和热损失的声学超材料的数值模型

Journal of Computational Acoustics Pub Date : 2017-11-21 DOI: 10.1142/S0218396X17500060

P. Juhl, V. Henríquez, P. R. Andersen, J. S. Jensen, J. Sánchez-Dehesa

引用次数: 26

Infinite Elements and Their Influence on Normal and Radiation Modes in Exterior Acoustics 外部声学中无限元及其对正态模态和辐射模态的影响

Journal of Computational Acoustics Pub Date : 2017-11-21 DOI: 10.1142/S0218396X1650020X

Lennart Moheit, S. Marburg

引用次数: 19

Acoustical Green’s Function and Boundary Element Techniques for 3D Half-Space Problems 三维半空间问题的声学格林函数和边界元技术

Journal of Computational Acoustics Pub Date : 2017-11-21 DOI: 10.1142/S0218396X17300018

R. Piscoya, M. Ochmann

引用次数: 3

Nonlinear Distortion Characteristic Analysis for the Finite Amplitude Sound Pressures in the Pistonphone 活塞筒有限幅声压非线性畸变特性分析

Journal of Computational Acoustics Pub Date : 2017-11-21 DOI: 10.1142/S0218396X1850008X

Fan Zhang, Wen He, Zhong Junjie

引用次数: 1

A Fourier Collocation Approach for Transit-Time Ultrasonic Flowmeter Under Multi-Phase Flow Conditions 多相流条件下渡越时间超声流量计的傅立叶配置方法

Journal of Computational Acoustics Pub Date : 2017-11-21 DOI: 10.1142/S0218396X17500059

M. Simurda, B. Lassen, L. Duggen, N. Basse

{"title":"A Fourier Collocation Approach for Transit-Time Ultrasonic Flowmeter Under Multi-Phase Flow Conditions","authors":"M. Simurda, B. Lassen, L. Duggen, N. Basse","doi":"10.1142/S0218396X17500059","DOIUrl":"https://doi.org/10.1142/S0218396X17500059","url":null,"abstract":"A numerical model for a clamp-on transit-time ultrasonic flowmeter (TTUF) under multi-phase flow conditions is presented. The method solves equations of linear elasticity for isotropic heterogeneous materials with background flow where acoustic media are modeled by setting shear modulus to zero. Spatial derivatives are calculated by a Fourier collocation method allowing the use of the fast Fourier transform (FFT) and time derivatives are approximated by a finite difference (FD) scheme. This approach is sometimes referred to as a pseudospectral time-domain method. Perfectly matched layers (PML) are used to avoid wave-wrapping and staggered grids are implemented to improve stability and efficiency. The method is verified against exact analytical solutions and the effect of the time-staggering and associated lowest number of points per minimum wavelengths value is discussed. The method is then employed to model a complete TTUF measurement setup to simulate the effect of a flow profile on the flowmeter accuracy and a study of an impact of inclusions in flowing media on received signals is carried out.","PeriodicalId":54860,"journal":{"name":"Journal of Computational Acoustics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1142/S0218396X17500059","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45907649","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: 6

An Interval Reduced Basis Approach and its Integrated Framework for Acoustic Response Analysis of Coupled Structural-Acoustic System 结构-声耦合系统声响应分析的区间降基法及其集成框架

Journal of Computational Acoustics Pub Date : 2017-09-12 DOI: 10.1142/S0218396X17500096

Lv Zheng, Qiu Zhiping, Li Qi

{"title":"An Interval Reduced Basis Approach and its Integrated Framework for Acoustic Response Analysis of Coupled Structural-Acoustic System","authors":"Lv Zheng, Qiu Zhiping, Li Qi","doi":"10.1142/S0218396X17500096","DOIUrl":"https://doi.org/10.1142/S0218396X17500096","url":null,"abstract":"An interval reduced basis approach (IRBA) is presented for analyzing acoustic response of coupled structural-acoustic system with interval parameters. Simultaneously an integrated framework based on IRBA is established to deal with uncertain acoustic propagation using deterministic finite element (FE) software. The present IRBA aims to improve the accuracy of the conventional first-order approximation and also allow the efficient calculation of second-order approximation of acoustic response. In IRBA, acoustic response is approximated using a linear combination of interval basis vectors with undetermined coefficients. To get explicit expression of acoustic response in terms of interval parameters, the three terms of the second-order perturbation method are employed as basis vectors, and the variant of the Galerkin scheme is applied for derivation of the reduced-order system of equations. For the second-order approximation, the determination of acoustic response interval is reformulated into a series of quadratic programming problems, which are solved using the difference of convex functions (DC) algorithm effectively. The performance of IRBA and availability of the present framework are validated by numerical examples.","PeriodicalId":54860,"journal":{"name":"Journal of Computational Acoustics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1142/S0218396X17500096","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41938309","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: 6

Sensitivity to High Frequency Communication Sounds in the Inner Ear Enhanced by Selective Attention: Preliminary Findings in Mongolian Gerbils 选择性注意增强内耳对高频交流声音的敏感性:蒙古沙鼠的初步发现

Journal of Computational Acoustics Pub Date : 2017-09-12 DOI: 10.1142/S0218396X17500163

Ayako Nakayama, H. Riquimaroux

{"title":"Sensitivity to High Frequency Communication Sounds in the Inner Ear Enhanced by Selective Attention: Preliminary Findings in Mongolian Gerbils","authors":"Ayako Nakayama, H. Riquimaroux","doi":"10.1142/S0218396X17500163","DOIUrl":"https://doi.org/10.1142/S0218396X17500163","url":null,"abstract":"Audible range for Mongolian gerbils overlaps well with one for humans. This is one of the reasons why they have been used for auditory studies. So, most of studies on gerbils have been in human audible frequency range. They live in a group and use a variety of vocalizations for their conspecific communication. Roughly 80% of the fundamental frequencies of their communication calls are found in the frequency range above 20kHz. However, thresholds for frequencies above 20kHz have been reported higher than those for low frequencies (from 1kHz to 16kHz) by as much as 20dB. We examined how gerbils utilize ultrasonic frequency range for their important vocal communication. Findings from alert animals with paired condition showed the cochlear microphonics (CM) were amplified by 2–4dB with ultrasonic communication calls of low sound pressure levels (from 45dB to 60dB p.e. SPL), while no enhancement was observed with the same calls higher than 65dB p.e. SPL. Findings also suggested that CM responses to tone burst higher than 25kHz demonstrated magnified amplitude under the paired condition. Data strongly imply that attention to conspecifics would increase sensitivity to ultrasonic frequency range.","PeriodicalId":54860,"journal":{"name":"Journal of Computational Acoustics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1142/S0218396X17500163","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44631510","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: 1

Bayesian Inversion for Geoacoustic Parameters from Ocean Bottom Reflection Loss 海底反射损失地声参数的贝叶斯反演

Journal of Computational Acoustics Pub Date : 2017-09-12 DOI: 10.1142/S0218396X17500199

Kunde Yang, Peng Xiao, Rui Duan, Yuanliang Ma

{"title":"Bayesian Inversion for Geoacoustic Parameters from Ocean Bottom Reflection Loss","authors":"Kunde Yang, Peng Xiao, Rui Duan, Yuanliang Ma","doi":"10.1142/S0218396X17500199","DOIUrl":"https://doi.org/10.1142/S0218396X17500199","url":null,"abstract":"Geoacoustic inversion is a very important issue in underwater acoustics, and the inversion method based on bottom reflection loss is a valid technique to invert bottom parameters. This paper describes a Bayesian method for estimating bottom parameters in the deep ocean based on inversion of reflection loss versus angle data which were obtained from an experiment conducted in South China Sea in 2013. The experimental data show that bottom loss depends on frequency. The Bayesian method can be applied in nonlinear inversion problems, and it provides useful indication about the quality of the inversion and parameter sensitivities. The bottom is modeled as a two-layer model, and each layer has constant parameters. The inverted parameters of sediment show a clay feature which is consistent with the core data. Furthermore, the inversion results are used to calculate transmission losses (TLs) along the experiment track which agree well with the direct measurements. Although the inversion results are limited to reveal exact structures of bottom, they are still useful for forecasting propagation losses in this area.","PeriodicalId":54860,"journal":{"name":"Journal of Computational Acoustics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1142/S0218396X17500199","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48445519","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: 15