Abstract
The finite element dynamic model of a honeycomb sandwich plate is presented using different mesh division for the surface plates and the sandwich plate to accurately express the crack damage status of the plate. The experimental measurements of plate natural frequency and dynamic responses are carried out for dynamic model verification. The feasibility of detecting small crack damage according to structural natural frequency and dynamic responses is evaluated. The results show that the energy spectrum of the decomposed wavelet signals of dynamic responses has a higher sensitivity to small crack damage, and more high order modes should be included in the dynamic model for structural damage detection.
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