On optimal retreat distance for the equivalent source method-based nearfield acoustical holography

2011 ◽  
Vol 129 (3) ◽  
pp. 1407-1416 ◽  
Author(s):  
Mingsian R. Bai ◽  
Ching-Cheng Chen ◽  
Jia-Hong Lin
Keyword(s):  
Equivalent Source ◽  
Source Method ◽  
Acoustical Holography ◽  
Nearfield Acoustical Holography ◽  
Equivalent Source Method

scholarly journals An Improved Algorithm for Noise Source Localization Based on Equivalent Source Method

2016 ◽  
Vol 2016 ◽  
pp. 1-13
Author(s):  
Zhongming Xu ◽  
Qinghua Wang ◽  
Yansong He ◽  
Zhifei Zhang ◽  
Shu Li ◽  
...  
Keyword(s):  
Source Localization ◽  
High Frequency ◽  
Noise Source ◽  
Near Field ◽  
Low Frequency ◽  
Equivalent Source ◽  
Source Method ◽  
Functional Equivalent ◽  
Acoustical Holography ◽  
Equivalent Source Method

Near-field acoustical holography (NAH) based on the equivalent source method (ESM) is an efficient method applied for noise source identification. Asl2-norm-based regularization cannot produce a satisfactory solution of the ill-conditioned problem in high frequency, the conventional ESM is restricted to relatively low frequency, and the resolution of conventional ESM in middle to high frequency remains a limitation open to investigation. This article presents an algorithm known as improved functional equivalent source method (IFESM), designed to enhance the resolution of conventional ESM. This method is developed in the framework of wideband acoustical holography (WBH) combining with functional beamforming (FB). Through numerical simulations, it is proved that the proposed method can localize noise with higher resolution compared with WBH and conventional ESM, and the ghosts on noise source map can be suppressed effectively. The validity and the feasibility of the proposed method are manifested by experiments including single-source and coherent-source localization.

scholarly journals A refined wideband acoustical holography based on equivalent source method

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Guoli Ping ◽  
Zhigang Chu ◽  
Zhongming Xu ◽  
Linbang Shen
Keyword(s):  
Equivalent Source ◽  
Source Method ◽  
Acoustical Holography ◽  
Equivalent Source Method
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