Numerical Solution Of Viscoelastic Coupled Lamb Waves Based On An Improved Root Seeking Algorithm

This paper uses the method of theoretical analysis, based on the existing research results, the 3D elastic theory, multi-layer model, Kelvin-Voight model and Hysteretic model to establish the relevant formulas. This paper focus on an improved root-finding algorithm to solve the coefficient determinant problem. Based on the result of the previous one, we reduce the range to solve the result of the next one. The improved algorithm can greatly reduce the calculation time and improve the accuracy of calculation. According to the calculation results, plot the frequency-dispersion-attenuation three-dimensional diagram of Lamb wave in the multilayer viscoelastic plate and the comparison diagram of the same mode dispersion curve under different fiber angles.