A Fast Beamforming Method to Localize an Acoustic Emission Source under Unknown Wave Speed

Materials

Dayi Zhang¹  Qiang Pan²  Xiaoran Wang²  Tian He²  Junfei Tai² 

[1] School of Energy and Power Engineering, Beihang University, Beijing 100083, China;School of Transportation Science and Engineering, Beihang University, Beijing 100083, China;

关键词: acoustic emission;    Bartlett beamforming;    fast damage localization;    structure health monitoring;   

DOI  :  10.3390/ma12050735

来源: DOAJ

【 摘 要 】

The beamforming method is capable of localizing the acoustic emission source in a large-scale structure but its accuracy relies strongly on the assumed propagation speed and it is quite time consuming to apply in online monitoring. This paper proposes a fast beamforming method to localize an acoustic emission source in a thin-walled structure with unknown wave speed. Firstly, the Bartlett beamforming method (BBM) is introduced into broadband Lamb wave signal processing to develop an L-shape array-based damage source localization method for a thin-walled structure. Secondly, the fast Bartlett beamforming method (FBBM) is proposed based on the characteristics of BBM. Finally, the pencil-lead break test is carried out to validate the proposed method. The test results show that the FBBM can accurately localize the damage source by any given probable wave speed much more rapidly than traditional delay-and-sum beamforming.

【 授权许可】

Unknown