汽车控制臂路试载荷谱的编制与转化

Preparation and Transformation of the Road Test Load Spectrum of Automobile Control Arm

提出1种多工况下普通轿车悬置零件程序载荷谱的编制方法,并对球销载荷与衬套载荷之间转化关系进行研究。基于试验测得控制臂球销道路载荷谱,运用雨流计数法将随机载荷谱进行处理;通过统计法建立多路况下载荷均幅值的复合概率密度函数,编制出1个完整循环下的程序载荷谱;运用非线性方程将球销载荷谱转化为衬套载荷谱。实现了汽车悬置零件的多工况道路程序载荷谱的编制及载荷之间的转化,该方法可为路试载荷下零样疲劳寿命预测及疲劳寿命试验提供参考。

A method for preparing the road load spectrum of the vehicle suspension parts under multiple working conditions was proposed, and the transformation relationship between the bushing load and the load of the ball pin was studied. Based on the experimental test, the load spectrum of the ball pin road was measured, and the random load spectrum was processed with rain flow counting method. The composite probability density function of the load amplitude under multiple working conditions was established by using the mathematical statistics method,and the programmed load spectrum of a complete cycle was compiled. The load spectrum of the ball pin was converted into the bushing load spectrum by using nonlinear equation. The preparation and transformation of the load spectrum of multiple working conditions for vehicle suspension parts are realized. The method can provide reference for fatigue life prediction and fatigue life test of specimen based on test load.