Journal of Computational Acoustics最新文献_第2页

Unsupervised Acoustic Analysis of the Vocal Repertoire of the Gray-Shanked Douc Langur (Pygathrix cinerea) 灰腿叶猴(Pygathrix cinerea)声乐曲目的无监督声学分析

Journal of Computational Acoustics Pub Date : 2017-09-12 DOI: 10.1142/S0218396X17500187

I. Riondato, Emanuele Cissello, E. Papale, O. Friard, M. Gamba, C. Giacoma

引用次数: 5

Erratum: Lamb Waves in a Perpendicularly Cracked, Poroelastic Plate 勘误:垂直裂纹多孔弹性板中的兰姆波

Journal of Computational Acoustics Pub Date : 2017-09-12 DOI: 10.1142/S0218396X17920023

R. Gilbert, Doo-sung Lee

引用次数: 0

The Biot Model for Anisotropic Poro-Elastic Media: The Viscoelastic Fluid Case 各向异性孔隙弹性介质的Biot模型:粘弹性流体情况

Journal of Computational Acoustics Pub Date : 2017-09-12 DOI: 10.1142/S0218396X17500126

R. Gilbert, Michael Shoushani

引用次数: 4

Low-Order Finite-Volume Based Riemann Solver for Application to Aeroacoustic Problems 基于低阶有限体积的黎曼解算器在气动声学问题中的应用

Journal of Computational Acoustics Pub Date : 2017-09-12 DOI: 10.1142/S0218396X17500102

W. V. D. Velden, J. Akhnoukh, A. V. Zuijlen

{"title":"Low-Order Finite-Volume Based Riemann Solver for Application to Aeroacoustic Problems","authors":"W. V. D. Velden, J. Akhnoukh, A. V. Zuijlen","doi":"10.1142/S0218396X17500102","DOIUrl":"https://doi.org/10.1142/S0218396X17500102","url":null,"abstract":"The current study focuses on the development of a three-dimensional flow and aeroacoustic solver developed in a finite-volume framework which uses similar, dense meshes for both flow and acoustics while using low-order schemes from the finite volume framework to minimize the points per wavelength, overcomes interpolation errors between flow and acoustic meshes, since one-to-one mesh mapping will be applied, minimize the computational time for the acoustic loop with respect to the fluid flow loop and provides a practical, easy to use integrated numerical tool. As dispersion errors are common within this computational framework, Riemann fluxes are used to solve the linearized Euler equations with unsteady quadrupole and dipole sources. A coupling scheme is presented and common issues with boundary conditions, mesh topology and sub-cycling are discussed. Various verification and validation test cases show the expected behavior and trends with respect to analytic and reference results. An application case is presented, where airfoil self-noise is determined around a beveled flat plate.","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/S0218396X17500102","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47523230","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: 4

Calculating Blood Pressure Based on Measured Heart Sounds 根据测量的心音计算血压

Journal of Computational Acoustics Pub Date : 2017-09-12 DOI: 10.1142/S0218396X1750014X

Lingguang Chen, Sean F. Wu, Yong Xu, W. Lyman, G. Kapur

{"title":"Calculating Blood Pressure Based on Measured Heart Sounds","authors":"Lingguang Chen, Sean F. Wu, Yong Xu, W. Lyman, G. Kapur","doi":"10.1142/S0218396X1750014X","DOIUrl":"https://doi.org/10.1142/S0218396X1750014X","url":null,"abstract":"The current standard technique for blood pressure determination is by using cuff/stethoscope, which is not suited for infants or children. Even for adults such an approach yields 60% accuracy with respect to intra-arterial blood pressure measurements. Moreover, it does not allow for continuous monitoring of blood pressure over 24 h and days. In this paper, a new methodology is developed that enables one to calculate the systolic and diastolic blood pressures continuously in a non-invasive manner based on the heart beats measured from the chest of a human being. To this end, we must separate the first and second heart sounds, known as S1 and S2, from the directly measured heart sound signals. Next, the individual characteristics of S1 and S2 must be identified and correlated to the systolic and diastolic blood pressures. It is emphasized that the material properties of a human being are highly inhomogeneous, changing from one organ to another, and the speed at which the heart sound signals propagate inside a human body cannot be determined precisely. Moreover, the exact locations from which the heart sounds are originated are unknown a priori, and must be estimated. As such, the computer model developed here is semi-empirical. Yet, validation results have demonstrated that this semi-empirical computer model can produce relatively robust and accurate calculations of the systolic and diastolic blood pressures with high statistical merits.","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/S0218396X1750014X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49254623","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

Reservoir Prediction Under Control of Sedimentary Facies 沉积相控制下的储层预测

Journal of Computational Acoustics Pub Date : 2017-09-12 DOI: 10.1142/S0218396X17500229

Xiuwei Yang, P. Zhu

引用次数: 0

Hybrid Approximation Hierarchical Boundary Element Methods for Acoustic Problems 声学问题的混合逼近层次边界元方法

Journal of Computational Acoustics Pub Date : 2017-09-12 DOI: 10.1142/S0218396X17500138

Xiujuan Liu, Haijun Wu, Weikang Jiang

{"title":"Hybrid Approximation Hierarchical Boundary Element Methods for Acoustic Problems","authors":"Xiujuan Liu, Haijun Wu, Weikang Jiang","doi":"10.1142/S0218396X17500138","DOIUrl":"https://doi.org/10.1142/S0218396X17500138","url":null,"abstract":"A multipole expansion approximation boundary element method (MEA BEM) based on the hierarchical matrices (H-matrices) and the multipole expansion theory was proposed previously. Though the MEA BEM can obtain higher accuracy than the adaptive cross-approximation BEM (ACA BEM), it demands more CPU time and memory than the ACA BEM does. To alleviate this problem, in this paper, two hybrid BEMs are developed taking advantage of the high efficiency and low memory consumption property of the ACA BEM and the high accuracy advantage of the MEA BEM. Numerical examples are elaborately set up to compare the accuracy, efficiency and memory consumption of the ACA BEM, MEA BEM and hybrid methods. It is indicated that the hybrid BEMs can reach the same level of accuracy as the ACA BEM and MEA BEM. The efficiency of each hybrid BEM is higher than that of the MEA BEM but lower than that of the ACA BEM. The memory consumptions of the hybrid BEMs are larger than that of the ACA BEM but less than that of the MEA BEM. The algorithm used to approximate the far-field submatrices corresponding to the cells and their nearest interactional cells determines the accuracy, efficiency and memory consumption of the hybrid BEMs. The proposed hybrid BEMs have both operation and storage logarithmic-linear complexity. They are feasible.","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/S0218396X17500138","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47821778","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: 11

Analysis of Wave Scattering from a Viscoelastic Layer with Complex Shape 复杂形状粘弹性层的波散射分析

Journal of Computational Acoustics Pub Date : 2017-09-12 DOI: 10.1142/S0218396X17500230

N. Favretto-Cristini, A. Aizenberg, B. Ursin, B. Ursin, P. Cristini, A. Tantsereva

引用次数: 7

An Efficient MFS Formulation for the Analysis of Acoustic Scattering by Periodic Structures 一种用于周期结构声散射分析的有效MFS公式

Journal of Computational Acoustics Pub Date : 2017-09-04 DOI: 10.1142/S0218396X18500030

L. Godinho, P. Amado-Mendes, A. Pereira, D. Soares

引用次数: 7

GPU Elastic Modeling Using an Optimal Staggered-Grid Finite-Difference Operator 基于交错网格有限差分算子的GPU弹性建模

Journal of Computational Acoustics Pub Date : 2017-09-04 DOI: 10.1142/S0218396X18500054

Wang Jian, Meng Xiaohong, Liu Hong, Zheng Wan-qiu, Liu Zhiwei

引用次数: 0