Orthogonal spherical wave source boundary point method and its application to acoustic holography

2004 ◽  
Vol 49 (16) ◽  
pp. 1758-1767 ◽  
Author(s):  
Chuanxing Bi ◽  
Xinzhao Chen ◽  
Jian Chen ◽  
Weibing Li
Keyword(s):  
Boundary Point ◽  
Spherical Wave ◽  
Point Method ◽  
Acoustic Holography ◽  
Wave Source ◽  
Boundary Point Method

scholarly journals Patch nearfield acoustic holography based on the distributed source boundary point method

2010 ◽  
Vol 59 (12) ◽  
pp. 8646
Author(s):  
Bi Chuan-Xing ◽  
Yuan Yan ◽  
He Chun-Dong ◽  
Xu Liang
Keyword(s):  
Boundary Point ◽  
Point Method ◽  
Acoustic Holography ◽  
Distributed Source ◽  
Boundary Point Method ◽  
Nearfield Acoustic Holography

Reconstruction and Separation in a Semi-Free Field by Using the Distributed Source Boundary Point Method-Based Nearfield Acoustic Holography

2007 ◽  
Vol 129 (3) ◽  
pp. 323-329 ◽  
Author(s):  
C. X. Bi ◽  
X. Z. Chen ◽  
R. Zhou ◽  
J. Chen
Keyword(s):  
Acoustic Field ◽  
Boundary Point ◽  
Free Field ◽  
Treatment Method ◽  
Point Method ◽  
Acoustic Source ◽  
Acoustic Holography ◽  
Distributed Source ◽  
Boundary Point Method ◽  
Nearfield Acoustic Holography

In a semi-free field, the acoustic field is composed of two components: the direct sound and the reflected sound. Because it is difficult to separate the direct sound from the acoustic field, conventional nearfield acoustic holography (NAH) methods cannot reconstruct an acoustic source and predict the acoustic field directly. Through utilization of the distributed source boundary point method (DSBPM)-based NAH, a treatment method for a semi-free field is proposed. In the method, the source in a semi-free field can be reconstructed correctly, and the acoustic field can be predicted and separated. An experiment on a speaker in a semi-anechoic chamber is carried out to verify the proposed method. By comparing the reconstructed and predicted results in DSBPM-based NAH with and without the proposed method, the proposed method is validated. The disadvantages of NAH without any treatment method in a semi-free field are demonstrated.

DISTRIBUTED SOURCE BOUNDARY POINT METHOD-BASED NEARFIELD ACOUSTIC HOLOGRAPHY FOR RECONSTRUCTING THE ACOUSTIC RADIATION FROM ARBITRARILY SHAPED OBJECTS

2006 ◽  
Vol 14 (04) ◽  
pp. 379-395
Author(s):  
C. X. BI ◽  
X. Z. CHEN ◽  
J. CHEN
Keyword(s):  
Boundary Point ◽  
Measurement Errors ◽  
Regularization Parameter ◽  
Point Method ◽  
Tikhonov Regularization Method ◽  
Acoustic Holography ◽  
Reconstruction Procedure ◽  
Distributed Source ◽  
Boundary Point Method ◽  
Nearfield Acoustic Holography

Nearfield acoustic holography (NAH) is an indirect technique for identifying noise sources and visualizing acoustic field. Recently, several different methods, such as the spatial Fourier transform method, the boundary element method (BEM) and the Helmholtz equation-least squares (HELS) method, have been used to realize the NAH successfully. In the paper, a novel numerical method, the distributed source boundary point method (DSBPM), is proposed to realize the NAH. In the method, the transfer matrices from the reconstructed surface to the hologram surface are constructed indirectly by a set of particular solution sources located inside the vibrating structure, and their inverses are carried out by singular value decomposition (SVD) technique. Additionally, considering the high sensitivity of the reconstructed solution to measurement errors, the Tikhonov regularization method is implemented to stabilize the reconstruction procedure and the regularization parameter is determined by L-curve criterion. Compared with the BEM-based NAH, the variable interpolation, the numerical quadrature, and the treatments of singular integral and nonuniqueness of solution are all avoided in the proposed method. Two numerical examples and an experiment are investigated to validate the feasibility and correctness of the proposed method.

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