The COMSOL finite element simulation software is used for modeling,and the contact area ratio is taken as the design parameter by changing the contact radius of the contact surface. Under the instan-taneous excitation,the stress wave is excited,which causes the piezoelectric plate on the surface of the structure to generate a voltage signal. The transmission coefficient of stress wave under different contact area ratio is obtained by analyzing the voltage signal. The relationship between the contact area ratio and the transmission coefficient is obtained by Ordinary Least Square(OLS). Then real contact area is determined by combining the analytical solution of the transmission coefficient of the stress wave through the contact surface. Applying this method to the detection of the contact area of the steel structure column node connec-tion plate,the absolute error of the contact area rate detection in the experimental design is 0.06％-4.75％,which has proven the effectiveness of this method.
维普
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