Journal Published Online: 27 March 2019
Volume 48, Issue 4

Research on Acoustic Emission Source Location Imaging in Aluminum Alloy Plate-type Structure

CODEN: JTEVAB

Abstract

The time reversal focusing and imaging technique is often used to locate the acoustic emission (AE) source on a plate-type structure. Because of the computational error caused by the dispersive modes of the raw AE signal, the AE source is sometimes located in the adjacent region of its real position and the pseudo-AE source will be focused in the location image of the AE source. This study is interested in how to effectively avoid the focusing of the pseudo-AE source. Thus, in this article, a Shannon wavelet transform with “Morlet” mother wavelet was used to isolate S0 modes from raw AE signals. The modulus value curves of the isolated S0 modes were treated by time reversal, time delay, and superposition at every grid point in the monitoring area, based on the time reversal focusing principle. The AE source was located at a certain grid point where the peak of the superposition curve is maximal. The monitoring area imaging was realized by defining every grid point’s pixel value with the peak of the superposition curves. The validating experiment was done in a 600 mm by 600 mm monitoring area which is on a 5052 aluminum alloy plate with dimensions of 1,200 mm by 1,200 mm by 3 mm. Comparing with the traditional square location method based on time difference of arrival (TDOA) calculation, the localization accuracy was improved and the maximal radial error is lower than 30 mm. Furthermore, the proposed localization method has a certain ability to overcome the effect of the plate size and local curvature.

Author Information

Wang, Shaofeng
School of Mechanical Engineering, Inner Mongolia University of Science and Technology, Baotou, Inner Mongolia Province, China Inner Mongolia North Heavy Industries Group Company Limited, Baotou, Inner Mongolia Province, China Baotou Special Equipment Inspection Institution, Baotou, Inner Mongolia Province, China State Key Laboratory for Manufacturing Systems Engineering, Xi’an Jiaotong University, Xi’an, Shaanxi Province, China
Wang, Daorui
School of Mechanical Engineering, Inner Mongolia University of Science and Technology, Baotou, Inner Mongolia Province, China
Wang, Jianguo
School of Mechanical Engineering, Inner Mongolia University of Science and Technology, Baotou, Inner Mongolia Province, China
Wang, Hailing
Inner Mongolia North Heavy Industries Group Company Limited, Baotou, Inner Mongolia Province, China
Xu, Guang
Baotou Special Equipment Inspection Institution, Baotou, Inner Mongolia Province, China
Hong, Jun
State Key Laboratory for Manufacturing Systems Engineering, Xi’an Jiaotong University, Xi’an, Shaanxi Province, China
Pages: 18
Price: $25.00
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Details
Stock #: JTE20180831
ISSN: 0090-3973
DOI: 10.1520/JTE20180831