Aimed at the present vehicle ride comfort and stable operation performance characteristics of the influence of suspension system features, this paper uses the virtual prototype technology to study the vehicle air suspension system.First, a simulation model is established based on vehicle suspension system parameters.Then, the key components of vehicle suspension system with the design of experiment DOE analysis technique are analyzed.Finally, control theory of "sensitivity analysis-hard point optimization-test" is used for the air suspension K&C characteristics of structure optimization design.The results show that the four-wheel positioning parameters after optimization, the change of toe angle is from 1.37°to 0.3°which is reduced by the amount of 78％;camber angle is 0.012°/mm, meeting the design requirements range of optimization(-0.003°~0.015°)/mm;Kingpin inclination angle after optimization is in the range of change 7°~11.5°, which is better before optimization that meets the design requirements;Kingpin caster angle after optimization shows that the round jump condition in basic characteristics remains unchanged.%针对目前汽车乘坐舒适度与运行平稳性易受悬架系统影响的特点,采用虚拟样机技术对车辆空气悬架系统进行了研究.首先,依据某车型悬架系统参数建立仿真模型,然后结合试验设计DOE分析技术对车辆悬架系统中的关键部件进行分析,最后采用"敏感度分析-硬点优化-试验验证"的控制理论,对空气悬架结构的K&C特性进行优化设计.结果表明,四轮定位参数经过优化之后,前束角从1.37°减至0.3°;外倾角优化后为0.012°/mm,符合(-0.003°~0.015°)/mm的设计要求;主销内倾角优化后为7°~11.5°,较优化前更好地满足了设计要求;主销后倾角在优化后表现出轮跳工况下基本保持不变的特性.
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