Abstract:

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 variables.Based on orthogonal regression design theory and parameterization
FE model of 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 completed based on the
reliability index.Results show that the optimized frame is reliable and lighter.

Key words: hydraulic flat transporter, frame optimum design, response surface method, finite element analysis(FEA), reliability

摘要：

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。
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关键词: 液压平板车, 车架优化设计, 响应面法, 有限元法, 可靠性