Authors: S A Ravanfar H Abdul Razak Z Ismail S J S Hakim
Publish Date: 2016/06/06
Volume: 56, Issue: 8, Pages: 1411-1426
Abstract
This paper proposes an optimized damage identification method in beamlike structures using genetic algorithm GA without baseline data For this purpose a vibrationbased damage identification algorithm using a damage indicator called ‘Relative Wavelet Packet Entropy’ RWPE was implemented to determine the location and extent of damage The procedure does not require vibration signals from an undamaged structure because the method of comparing signals from different locations in the existing state was found to be effective To ameliorate the algorithm GA was utilized to identify the best choice for “mother wavelet function” and “decomposition level” of the signals by means of the fundamental fitness function to optimize the algorithm This resulted in the high accuracy of the damage identification algorithm In addition this method has eliminated the difficulties in selecting the type of mother wavelet function for damage identification purposes To investigate the robustness and accuracy of the proposed method numerical examples and experimental cases with different damage depths were considered and conducted The results demonstrated that the proposed method has great potential in the identification of damage location and depth of cut in beamlike structures since it does not require the recorded data from an undamaged beam as a baseline for damage detection Moreover the relationship between damage location and depth of damage has been evaluated and results showed that the algorithm can be applied to actual structures
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