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中文摘要：
提出一种基于响应面方法的汽车转向系统固有频率优化方法。以某微型车为例,该方法从建立汽车转向系统的有限元模型出发,结合拉丁方试验设计方法,采用最小二乘法建立转向系统的二次响应面近似模型;在此基础上,以转向系统的1阶固有频率最大化为目标,总质量为约束,并通过灵敏度分析选取5个部件有限元模型壳单元壁厚为设计参数,建立优化模型。对转向系统进行优化的结果表明,采用该方法对汽车转向系统进行优化,能有效提高其1阶固有频率,减小转向系统质量,从而抑制转向系统的振动。
英文摘要：
An optimization scheme for the natural frequency of vehicle steering system based on response surface method is proposed in this paper.Taking a mini car as example,the method starts with building the finite element model for steering system,combined with Latin square experimental design and using least square method to set up quadratic response surface approximate model.On this basis,with maximizing the first natural frequency of steering system as objective,total mass as constraint and the thickness of shell elements in FE model for 5 components chosen by sensitivity analysis as design parameters,the mathematical model for optimization is established.The results of optimization indicate that the optimization of steering system with the scheme can effectively raise its first natural frequency,reduce total mass and hence suppress the vibration of steering system.
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