RESEARCH ARTICLE


A New Structural Damage Identification Method Based on Wavelet Packet Energy Entropy of Impulse Response



Can He1, Jianchun Xing*, 1, Juelong Li2, Wei Qian2, Xun Zhang1
1 College of Defense Engineering, PLA University of Science and Technology, Nanjing, 210007, China
2 Technical Management Office of Naval Defense Engineering, Beijing, 100841, China


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Creative Commons License
© 2015 He et al;

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the College of Defense Engineering, PLA University of Science and Technology, Nanjing, 210007, China; Tel: (86)025-80825341; Fax: (86)025-80825341; E-mail: xjc893@163.com


Abstract

Excitation makes a great influence on the wavelet energy distribution of the response signal, this deficiency leads that the traditional structural damage identification method based on wavelet energy has a low precision. In order to solve this problem, a new structural damage identification method based on wavelet packet energy entropy (WPEE) of impulse response is presented in this paper. Firstly, natural excitation technique (NExT) is adopted to extract structural impulse response. Then, WPEE of the impulse response is computed, and the change rate of WPEE is used to construct the structural damage index. An experiment of damage identification on a pile structure is provided to verify the effectiveness of the proposed method. Experiment results show that this method can accurately identify the single damage and multi-damage.

Keywords: Impulse response, structural damage identification, wavelet packet energy entropy.