Respiratory crack location method for beam structures based on bilinear frequency separation
Aiming at the problem of early respiratory crack location of beam structures,based on the difference of bilinear degree of different measuring points of beams with respiratory cracks,a bilinear frequency separation method for respiratory crack location of beam structures was proposed.By using the techniques of zero search and signal segmentation,the structural responses of dif-ferent spatial positions were decomposed into positive and negative response components corresponding to bilinear effects,which reflect the dynamic behavior of the structure in the crack opening state and closed state,respectively.The difference of frequency components of split components at different measuring points is related to the location and depth of cracks,so the distance damage index of bilinear frequency components was constructed to realize the location of cracks.The numerical study of the influencing factors such as crack location,crack depth,excitation frequency and amplitude,natural structure shape and noise shows the effec-tiveness of the method and can provide a theoretical basis for practical engineering applications.
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维普
