关键词: 车辆工程, 建模与仿真, 有限元法, 随机振动, 虚拟激励

Abstract:

Taking a 9 DoF fullvehicle model as an example, the vehicle vibration structure was discretized with the idea of finite element method(FEM). The element stiffness matrix and damping matrix were given by the transform of element displacement. The coefficient matrix of the mathematical model of the vehicle vibration was assembled according to the position of the element displacement in the vector of structure displacements. A mathematical model of vehicle vibration was built as the forced displacement disposed of as the restraint. The vibration response variables were deduced with the idea of FEM, and their simulations were realized by the virtual excitation theory. The results show that the combination of the modelling and the simulation provides a practical approach to the random vibration analysis of complex vehicles.

Key words: vehicle engineering, modelling and simulation, finite element method(FEM), random vibration；virtual excitation