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运用概率分析方法建立某转向架构架的参数化有限元模型。选取构架的材料属性、几何参数和载荷等作为随机变量,通过统计分析得到其分布参数。用构架母材和焊缝部位疲劳薄弱处的最大主应力和其许用疲劳强度建立疲劳强度可靠性失效状态函数。基于蒙特卡罗数值模拟方法,计算转向架构架的可靠度及参数灵敏度。分析结果表明:在所选择的随机变量中,空气弹簧部位的载荷变量和材料的许用疲劳强度变量对构架的疲劳强度可靠性影响较灵敏,而板厚变量和局部的载荷变量对构架的疲劳强度可靠性影响不显著。提出了转向架构架可靠性优化设计的建议。
Using Probabilistic Analysis Method to Establish Parametric Finite Element Model of a Bogie Frame. The material properties, geometrical parameters and loads of the frame are selected as the random variables, and their distribution parameters are obtained through statistical analysis. The fatigue strength reliability failure state function was established by using the maximum principal stress and its allowable fatigue strength at the fatigue strength of the base metal of the structure and the weld. Based on the Monte Carlo numerical simulation method, the reliability and parameter sensitivity of the bogie frame are calculated. The analysis results show that among the selected random variables, the load variation of air spring and the allowable fatigue strength of material are more sensitive to the fatigue strength reliability of the frame, while the thickness variation and the local load variables are not suitable for the fatigue of frame The effect of strength and reliability is not significant. Proposed the reliability of bogie frame design.