基于超单元建模法的车身动力学仿真分析

Vehicle body dynamics simulation and analysis based on the super-element modeling method

为了解决车身动力学仿真的计算效率问题,提出基于超单元建模法的车身结构动力学仿真分析方法.该方法将某MPV车型车身结构划分为若干个子系统,通过超单元缩聚、剩余结构求解及超单元数据恢复三个阶段获得车身系统模态参数和频响函数.结果表明:与传统建模分析方法相比,在不降低计算精度的前提下,采用超单元建模法进行车身模态分析时的计算时间缩短约6.9%;在结构优化目标下进行基于频率响应分析的整车加速工况仿真时的计算时间缩短约87.7%;并且在整车加速工况仿真中,通过超单元建模分析方法得到的车内地板振动响应在总体趋势和峰值频率点方面均与试验结果较一致.

For increasing the computational efficiency of vehicle body dynamics simulation, a method for body structure dynamics simulation analysis was proposed in this paper. According to the method, a MPV（multi-purpose vehicle）body structure was divided into several subsystems and then body mo- dal parameters and frequency functions were obtained through super-element reduction, residual structure solution and super-element data recovery. The study results show that compared to tradi- tional modeling method, computational time is reduced approximately respectively by 6.9~ in body modal analysis and 87.7% in the vehicle acceleration simulation and body optimization based on fre- quency response analysis without reducing accuracy. And in vehicle acceleration simulation, vehicle interior vibration-response-simulated results are in accordance with on-road test in aspects of trend and peak frequency points.