基于虚拟激励法的变速行驶车辆振动分析

在虚拟激励法的基础上,建立了人车路垂向动力学模型和道路虚拟输入模型,推导了车辆非匀速行驶的时-空频率关系,得到了车辆非平稳响应的瞬时功率谱,应用Mathematic语言编制了四分之一人车模型的仿真程序,以简化模型为例,考察了变速车辆行驶的平顺性.数值仿真结果表明,虚拟激励法用于求解车辆振动响应,尤其是用于非平稳随机输入下的车辆振动分析,简便快捷,省时省力,能很好地反映汽车乘坐舒适性.

Vibration Analysis of Vehicle at Uneven Speed with Pseudo-excitation Method

The vertical model of vehicle dynamics and the virtual model of road input were deduced in pseudo-excitation method.The correlation between time and spatial frequencies was derived.The transient Power Spectral Density(PSD) of vehicle in nonstationary random vibration was obtained.A system performance simulation program for 3 DOF's vehicle model was developed by using Mathematic language.As an illustrative example,the rood-induced random response of a man-car model was explored.As a result,it was highly efficient to solve the vibration problem of vehicle,especially to solve nonstationary random vibration of vehicle in pseudo-excitation method,and it was also easy to calculate in that method.It will be useful in the assessment of vehicle ride comfort.