基于路面随机激励的8自由度整车动力学仿真

Dynamical simulation of 8-DOF vehicle suspension based on stochastic road surface excitation

建立包括6个垂直跳动和2个转动的整车8自由度动力学模型,应用拉格朗日原理建立各自由度动力学方程,采用振型叠加法进行求解.针对一整车模型实例,以随机输入模拟路面激励,应用Fortran语言编制程序进行动力学仿真,计算分析了整车的8阶自振特性以及各个自由度的动力特性,通过位移响应曲线评价了汽车运动时的平顺性.

In this study, an eight degree-of-freedom （8-DOF） model, which includes 6 perpendicular and 2 rotary freedoms, is developed for suspension systems of a vehicle. In this respect, the dynamical equations, which are solved using an accumulative method for vibratory waveforms, are established based on the Lagrange function. Though stochastic road surface excitation testing, the dynamic simulation, together with the 8-DOF vibratory and dynamical properties, is attained using FortranTM. Furthermore, the riding comfort is evaluated via displacement response curves.