Identification of Fracture Damage of the Space Truss Structure Based on the Combined Application of Wavelet Analysis and Strain Mode Method

Abstract:

The space truss structure is difficult to avoid damage in service. There are so many nodes and bars in the structure that damage identification could not be achieved, if sensors are putted on all nodes to obtain response of the structure. Therefore, wavelet analysis method is proposed in the paper, which uses limited information of measuring points to measure acceleration response of the nodes. Damage of a bar will lead to the singularity of the acceleration high-frequency signals by wavelet transformation. According to singularity value, the range of influence of damaged structural bar is determined, then structural sub regions are divided and accelerators are distributed. The first step damage detection methods is identifying damaged bar occurrence region; the second step damage detection methods is locating damaged bar in the region using strain mode method. At last, taking the space truss structure as numerical example, it shows the method has the capability to detect the fracture damage of bars successfully.

• Periodical: Applied Mechanics and Materials (Volumes 351-352)
• Pages: 1130-1137
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.351-352.1130
• Online since: August 2013
• Authors: Qian Wang, Hui Liu, Qian Wang
• Keywords: Fracture Damage of the Bars, Space Truss Structure, Strain Mode, Wavelet Analysis

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