基于近似模型的车轮定位参数优化设计研究

Optimization and Research of Wheel Alignment Parameters Based on Approximates Model

为改善某车型前悬架优化设计中其运动学特性,解决前轮胎磨损较严重问题,提出一种基于近似模型应用改进响应面法对车轮定位参数进行优化设计。首先,应用ADAMS/Car软件建立了麦弗逊式前悬架仿真分析模型,并在ADAMS/Insight中对悬架部分设计硬点参数进行灵敏度分析。然后,针对灵敏度大的设计参数建立车轮定位参数在跳动过程中最大变化量的二阶响应面近似数学模型,并利用Matlab编程对拟合出的近似模型优化求解与可靠性分析。最后,将优化后车轮定位参数最优值代入悬架模型中,在ADAMS/Car中再次进行轮跳仿真试验,对比应用传统响应面优化方法优化悬架前后试验结果表明,该优化设计方法具有较好的优化效果。

To improve the kinematic characteristics of a vehicle front suspension and solve the front wheels wear problem, the front wheel alignment parameters were^optirnized based on approximate model by the improved response surface method. First, the simulation model of McPherson suspension was established by ADAMS/Car, and the Suspension structural point parameters＇ sensitivity was analyzed by ADAMS/Insight. Then, for the greater sensitivity of design parameters, a second- order response surface approximate model of the wheel alignment parameters maximum in the wheel hop was established and analyzed, using Matlab to solve the approximate model and reliability by programming. Finally, the optimization of the optimal alignment parameters was analyzed again in the ADAMS/Car, the superiority of the design method is proved by comparing the traditional response surface and the improved response surface.