基于响应面法的液压平板车车架结构优化

Research on Optimum Design of Hydraulic Flat Transporter Frame Based on Response Surface Method

针对传统机械设计以应力强度为基础,其结果往往不是最优解的问题,采用应力试验法及有限元分析法获得了车架的危险部位,即车架横梁之间的腹板孔口倒角处存在明显应力集中。因此取车架腹板开孔孔长、宽及倒圆半径为设计变量,对车架结构进行了优化设计。采用回归的正交设计理论,结合ANSYS液压平板车车架的参数化有限元模型,得出了车架腹板最大应力的响应面函数。运用MATLAB优化工具箱得到可靠度指标,最终实现了以可靠度为目标的车架结构优化,优化结果使得结构在安全可靠的前提下更轻。

The traditional mechanical design based on stress intensity could not always get the best optimum solution. By the method of stress field test and FE--software ANSYS analysis, the weak parts were obtained. The stress was concentrated obviously on the chamfer of web ~s hole between the crossbeams. Therefore, the hole ~s length, width and pour circle radius were selected for the design var- iables. Based on orthogonal regression design theory and parameterization FE model o[ hydraulic＇ s frame,the function of maximum stress was obtained. The frame^s reliability index was obtained using MATLAB mathematics tool case. The optimum design of the off--road vehicle frame was finally com- pleted based on the reliability index. Results show that the optimized frame is reliable and lighter.