【摘要】 针对汽车悬架系统中的下摆臂运动特性,首先对悬架下摆臂进行了有限元分析,得出其在最大垂直力工况、最大侧向力工况以及最大制动力工况下的应力状态,并以此为基础,以多工况结构加权应变能为目标函数,以下摆臂的体积分数为约束条件,对其进行拓扑优化。其次,根据拓扑优化的结果,对其进行几何重构及改进。再次,以下摆臂质量最小为优化目标,以上下板厚度为设计变量,对改进后的下摆臂结构进行尺寸优化。最终,将优化前后下摆臂的质量、强度、刚度等特性进行对比分析,结果显示,优化后的下摆臂的结构性能都得到满足并且减重效果良好。更多还原

【Abstract】 The lower arm of the suspension is a crucial part in transmitting forces and leading the direction. Its strength and stiffness are of great significance to the performance of the automobile. According to the movement characteristics of the lower arm, finite element analysis has been firstly applied to it to get the stress states under the three typical and extreme conditions. Based on the finite element analysis, topology optimization for solving the functions in terms of weighted strain energy has been applied to the model with the constraint of volume fraction. Secondly, geometry structure of the lower arm has been reconstructed based on the result of topology optimization. Thirdly, dimensional optimization has been adopted to the modified structure,for minimising the weight of the lower arm. Finally, comparing the characteristics(e.g. weight, strength, rigidity)of the lower arm after and before the optimization, the structural requirements of the optimized arm have been satisfied and the goal of losing weight has been well achieved.更多还原