Affiliations: State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace, Xi'an Jiaotong University, Xi'an 710049, Shaanxi, China
Correspondence:
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Corresponding author: Shilin Xie, State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace, Xi'an Jiaotong University, Xi'an 710049, Shaanxi, China. E-mail:slxie@mail.xjtu.edu.cn
Abstract: A new structure damage identification method is proposed
based on wavelet packet analysis of the time domain response. It is known
that the distribution of the wavelet packet node energy of response varies
if the structure is damaged. The presented identification approach considers
the variation rate of variance (VRV) of each node energy distribution as the
damage detection index. Through decompositions of the time domain responses
of intact and damaged structures using the wavelet packet transformation,
the location and the degree of damage in the structure can be identified.
Both the simulated and experimental studies on damage identifications are
carried out for beam structure with crack based on the proposed method. The
identification results show that the presented method is able to identify
damages more accurately in the case of noise contamination compared with the
previous methods.
