Research on fixed-end beam structural damage feature identification method based on multidimensional data coupling-wavelet transform
A method based on Multidimensional Data Coupling-Wavelet Transform was proposed to solve the fixed-end beam structural damage feature identification. A simplified approach for non-uniform damage was proposed with uniform and non-uniform damage as the research objects. The strain mode of the fixed-end beam structure was taken as the damage parameter,and the fixed-end beam was sliced in multiple dimensions in order to obtain the strain mode data of the fixed-end beam structural for each dimension. The strain mode data of different dimensions were coupled through a multidimensional data coupling method to amplify the damage characteristics and make the single dimensional strain mode data exhibit multidimensional characteristics. Then,the damage feature (i.e.,damage location and shape) of the damaged fixed-end beam was identified by comparing the singularity magnitude of the singular point position in the wavelet coefficient,which was obtained by performing wavelet transform on coupled data. The numerical simulation and experimental analysis of the fixed-end beam structure with uniform and non-uniform damage indicate that the coupling of multidimensional data can effectively amplify damage characteristics,enabling small damages to be identified in practical engineering. Under the same working condition,the greater damage severity is,the greater the corresponding wavelet coefficient singularity is. Therefore,the damage location and damage shape of the fixed-end beam structure can be effectively identified based on the singularity of the wavelet coefficients. In the experiment,the wavelet coefficients of multi-dimensional coupled data can effectively avoid the edge effect,making the edge damage feature of the fixed-end beam structure identified. The above research results show that the proposed damage identification method can effectively solve the problem of damage feature identification in fixed-end beam. It provides a way to solve the shortcomings of damage feature identification based on wavelet transform,can effectively solve the edge damage identification problem of the actual structure,and could provide theoretical basis and technical support for the actual structure damage identification.
non-uniform damagedamage feature identificationmultidimensional data couplingwavelet transformstructural experiment
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