车辆-人体系统振动的时域模拟及频谱分析

Time domain vibration simulation and spectralanalysis of vehicle-human system

基于SY6480轻型客车建立了车辆 人体振动系统的12个自由度动力学模型。模型中引入了四轮相关路面激励和人体模型,以能量方程推导出系统的动力学方程,进而对系统的振动过程进行了时域模拟和试验验证。所得的模拟结果比传统的频域模拟结果更精确可靠。对车辆角振动和人体各部位的振动情况谱分析结果表明:车身的角振动能量大约为垂直振动能量的1/4,研究时不能忽略,人体垂直振动的固有频率为2.0～2.5Hz,可为车辆平顺性设计提供参考。

A dynamic vibration model with twelve degrees-of-freedom of vehicle-human system was established for the light-duty bus SY6480. A road excitation with the correlation of four wheels and a human body model were included in the vehicle model. The dynamic equations were derived from the system energy equations,and vehicle-human system vibration simulation in time domain as well as experiment verification was carried out. The comparisons show that obtained simulation results are more accurate than those calculated from the conventional linear method in frequency domain. Furthermore, the spectral analysis on the sample vehicle shows that the angular vibration energy is about one-fourth of that in vertical vibration of the vehicle, so that cannot be ignored in vehicle vibration study, and the vertical eigenvibration of human body has a resonant frequency of 2.0～2.5 Hz, which may be a reference for vehicle ride comfort design.