Sound field reconstruction using inverse boundary element method and sparse regularization

2019 ◽  
Vol 145 (5) ◽  
pp. 3154-3162 ◽  
Author(s):  
Chuan-Xing Bi ◽  
Yuan Liu ◽  
Yong-Bin Zhang ◽  
Liang Xu
Keyword(s):  
Boundary Element Method ◽  
Boundary Element ◽  
Sound Field ◽  
Sparse Regularization ◽  
Inverse Boundary ◽  
Field Reconstruction ◽  
Sound Field Reconstruction ◽  
Element Method

Comparisons of regularization methods and regularization parameter selection methods in sound source identification using inverse boundary element method

2019 ◽  
Vol 67 (3) ◽  
pp. 219-227
Author(s):  
Youhong Xiao ◽  
Qingqing Song ◽  
Shaowei Li ◽  
Guoxue Lv ◽  
Zhenlin Ji
Keyword(s):  
Boundary Element Method ◽  
Boundary Element ◽  
Transfer Matrix ◽  
Sound Source ◽  
Source Identification ◽  
Regularization Parameter ◽  
Vibration Velocity ◽  
Regularization Methods ◽  
Inverse Boundary ◽  
Element Method

In noise source identification based on the inverse boundary element method (IBEM), the boundary vibration velocity is predicted based on the field pressure through a transfer matrix of the vibration velocity and field pressure established on the Helmholtz integral equation. Because the matrix is often ill-posed, it needs to be regularized before reconstructing the vibration velocity. Two regularization methods and two methods of selecting the regularization parameter are investigated through the simulation analysis of a pulsating sphere. The result of transfer matrix regularization is further verified through the reconstruction of the vibration of an aluminum plate. Additionally, to reduce the large errors at some frequencies in the reconstruction result, increasing the number of measuring points is more effective than reducing the distance between the measurement plane and the sound source.

An inverse boundary element method computational framework for designing optimal TMS coils

2018 ◽  
Vol 88 ◽  
pp. 156-169 ◽  
Author(s):  
Clemente Cobos Sánchez ◽  
Francisco Javier Garcia-Pacheco ◽  
Jose Maria Guerrero Rodriguez ◽  
Justin Robert Hill
Keyword(s):  
Boundary Element Method ◽  
Boundary Element ◽  
Computational Framework ◽  
Inverse Boundary ◽  
Element Method

516 Analysis of 3-Dimensional Sound Field by the Boundary Element Method

2000 ◽  
Vol 2000.53 (0) ◽  
pp. 155-156
Author(s):  
Koji MATSUMOTO ◽  
Yoichi KANEMITSU ◽  
Shinya KIJIMOTO ◽  
Koichi MATSUDA
Keyword(s):  
Boundary Element Method ◽  
Boundary Element ◽  
Sound Field ◽  
3 Dimensional ◽  
Element Method

E-coil: an inverse boundary element method for a quasi-static problem

2010 ◽  
Vol 55 (11) ◽  
pp. 3087-3100 ◽  
Author(s):  
Clemente Cobos Sanchez ◽  
Salvador Gonzalez Garcia ◽  
Henry Power
Keyword(s):  
Boundary Element Method ◽  
Boundary Element ◽  
Static Problem ◽  
Inverse Boundary ◽  
Element Method

scholarly journals Sound field study of a building near a roadway via the boundary element method

2017 ◽  
Vol 37 (3) ◽  
pp. 519-533 ◽  
Author(s):  
Haibo Wang ◽  
Ming Cai ◽  
Shuqi Zhong ◽  
Feng Li
Keyword(s):  
Boundary Element Method ◽  
Boundary Element ◽  
Insertion Loss ◽  
Sound Field ◽  
Road Traffic Noise ◽  
Heavy Vehicles ◽  
Main Frequency ◽  
Aspect Ratios ◽  
Hankel Functions ◽  
Element Method

A two-dimensional boundary element method with a constant element type was adopted to study the sound field of a building near a roadway. First, a factor analysis of the computed results has been done, which include the element length, the Hankel functions’ calculation accuracy, and numerical integration accuracy. Then, boundary element method is applied to calculate building attenuation with different building aspect ratios and different frequencies with balconies, followed by drawing of the sound field distribution diagram. The calculation results revealed the following: (1) a wider building results in a more severe sound attenuation; (2) balconies on different floors produce a reduction of approximately 15 dB for broadband spectral characteristics of A-weight road traffic noise, and the maximum values appear at the bottoms of balconies; (3) for the points in the balconies, higher sound frequencies are correlated to larger insertion loss, with the insertion loss increasing from 3 dB to >10 dB when the sound frequency increases from 20 to 4000 Hz; (4) calculations of three typical frequencies indicate that the insertion loss of 500 Hz (main frequency of heavy vehicles) is 6 dB less than that of 800 Hz (main frequency of light vehicles), i.e. the flow control of heavy vehicles could conspicuously improve the ambient acoustic environment of buildings near a roadway.

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