摘要
汽车的操纵稳定性直接关系到汽车的行驶安全,通过建立线性两自由度汽车模型,以车辆固有圆频率为优化目标,车辆前、后轮侧偏刚度为设计变量,阻尼比、适度不足转向为约束条件,建立优化设计数学模型。利用MATLAB优化工具箱,对某车辆进行优化,并对优化前、后车辆的性能进行时域和频域对比分析。结果表明:优化后汽车的固有圆频率提高、反应速度加快,且超调量也控制在合理的范围,为汽车操纵稳定性的研究提供了一个简捷可行的方法。
Car＇s steering stability is related to vehicle driving safety directly, the optimum design mathematical model of a car is set up through the two degrees of freedom linear model,while the inherent circular frequency of vehicle as the optimization goal, front and rear wheel cornering stiffness of vehicle as design variables, damping ratio and moderately understeer as constraint conditions. Optimization algorithm of vehicles performance is carried out by using MATLAB optimization toolbox,then compares the vehicles performances of before and after optimization in time domain and frequency domain analysis. Results show that the optimized car＇s inherent circular frequency increased, reaction speed improved, and the overshoot of control in a reasonable scope, also provides a simple and feasible method for the research of vehicle handling stability.
出处
《装备制造技术》
2017年第2期6-8,35,共4页
Equipment Manufacturing Technology
基金
广西自然科学基金(项目编号:2014GXNSFAA118348)
广西大学实验教改项目(20140118)
关键词
操纵稳定性
优化设计
阻尼比
固有圆频率
steering stability
optimization design
damping ratio
inherent circular frequency
