Abstract: Aiming at the problem of low calculation efficiency for the flexible multibody dynamics model of the Baja racing suspension system, a method was proposed and simulation verification and analysis were carried out for dynamic modeling and solving of suspension system based on spectral method. Firstly, the spectral method was used to discretize the elastic deformation function of the flexible beam in the suspension system and expanded it into a finite-term Chebyshev polynomial. Then, the elastic deformation function was processed based on the replacement method. The dynamic model of the suspension system expressed by the spectrum was established based on the elastic deformation function and the Lagrange dynamics formula, and the generalized α method was used to solve it iteratively. Finally, the simulation results of the program were compared with the calculation results of the finite element dynamic model and the hypothetical modal dynamic model. The research results show that the relative error of the frame displacement is 3.57% and the minimum relative error of the elastic deformation of the flexible beam is 1.18% between the simulation results and the calculation results of the finite element dynamics model. Comparing with the hypothetical modal method model, the computational efficiency of this method is 4.896 times more than that of the hypothetical modal method.

Key words:  spectral method; suspension system; dynamics modeling; dynamics simulation; elastic deformation

LI Xiao-fei, LI Hai-yan, LIANG Gui-ming. Efficient dynamics simulation of flexible suspension system based on spectral method［J］.Journal of Mechanical & Electrical Engineering, 2022,39(2):166-172,230.