某跑车操纵稳定性仿真及优化

Simulation and Optimization of Sports Car with Respect to Steering Stability

运用多体动力学分析软件Adams/Car,对某跑车建立了135自由度整车模型,对其仿真按照操纵稳定性国家标准进行评分,发现了该车某些性能的不足之处。传统的操纵稳定性优化方法主要是通过优化悬架定位参数,但该悬架的定位参数都已经过优化,仍达不到预期效果。为进一步优化该车的某些性能不足之处并保证其他优秀性能不变,本研究采用保持悬架定位参数不变,以整车质量、前轴轴荷、后横向稳定杆扭转刚度3个参数作为优化设计参数,对整车操纵稳定性进行优化分析,发现可显著提高其操纵稳定性。

A multi-body system dynamic model of 135 degrees of freedom was built using the software Adams/Car, and a simulation was carried out according to the Chinese standards. The simulation results show that some automotive characteristics are not satisfactory. Traditional method for optimizing controllableness and stability is to deal with the suspension alignment parameters, which can be considered as have already been optimized. In order to further improve these characteristics while retaining other features of good performance, in this paper, the suspension alignment parameters are kept as unchanged. Three parameters, i.e. the outfit mass, the load of front axis and the torsion stiffness of rear antiroll bar are selected as the optimization objectives. The simulation results indicate that the automotive controllableness and stability are improved considerablyafter the optimization.