三轮摩托车车架优化设计研究

On Optimal Design of the Motor Tricycle Frame

本文应用有限元方法建立了某款三轮摩托车车架的梁单元分析模型，应用MSC．Nastran软件模拟了车架在极限使用工况下的应力分布情况。在此基础上以车架的强度为约束条件、车架管梁的截面尺寸为设计变量、车架质量最小为目标函数，基于专业优化软件HyperStudy建立了结构优化的数学模型，并进行了优化计算，从而获得了最佳的结构截面参数，使车架在满足约束条件的前提下，达到了质量最小的效果，有效地降低了成本。

In this paper, a finite element analytic model for the beam of motorcycle frame is built and MSC. Nastran is applied to simulate the stress distribution of fame under the condition of maximum use. Meanwhile, based on the simulation,a structure -optimized mathematic model with HyperStudy is established with the strength as con- straints, sectional dimension of beams as design variables and lightest weight as objective function. After calculated, optimum parameters of structural section are obtained. So, the light - weight design is achievable and the cost is re- duced provided the frame meets the contraints.