基于虚拟激励法的三维随机路面仿真

通过改进的虚拟激励法原理,在现有二维路面谱的基础上,从空间路面频率谱出发,将之拓展到三维空间内的路面谱,给出模拟随机路面谱的方法。同时,为了给虚拟样机仿真分析提供较为复杂三维仿真路面环境,基于单点FFT路面不平度时域模型,建立了三维FFT随机路面数学模型,并实现了其在Matlab中的仿真;依据改进的虚拟激励法理论,建立了生成三维路面文件的通用模型,包括节点的生成和单元生成算法,并导入Adams形成所需的三维路面仿真环境。应用上述方法生成C级路面.对所选择的车辆样机进行了行驶平顺性仿真,与GB/T 13441—92标准对比分析得到了该车行驶平顺舒适性的合理时间。

Simulation of three-dimensional road based on pseudo excitation method

By ameliorating the pseudo excitation method,a new approach to simulate 3-D numerically stochastic signals excited by road irregularities was put forward,proceeding from space road spectrum,based on two～dimensional road spectrum mode.And in order to provide the simulation of virtual prototype with a complex 3-D virtual road environment,a 3-D mathematical model for 3D FFT stochastic road was established based on the roughness time domain model for single-point FFT road,and the simulation was realized by Matlab.What’s more,based on the theory of new pseudo excitation method,a general 3-D virtual road model with the arithmetic of nodes and elements was created.Then a specified 3-D virtual road file was imported into Adams to form the 3-D virtua1 road.Finally,a c-level virtual road was generated to simulate the riding comfort of virtual vehicle selected,which result shall be compared with the GB/T 13441-92,thus the virtual vehicle’s reasonable time of the riding comfort was obtained.