抗侧滚扭杆安装参数对扭杆轴强度影响分析

Analysis the Effect of Anti-roll Bar Installation Parameters on Torsion Bar Strength

针对轨道车辆侧滚刚度确定后,如何布置安装抗侧滚扭杆能够降低扭杆轴应力问题,文中推导建立了扭杆轴最大应力与其安装位置参数的关系式,得出在车辆侧滚刚度确定后,扭杆轴最大应力是关于扭杆轴长度、扭臂中心距的减函数,是关于连杆跨距、扭杆支撑位置至连杆中心距离的增函数。因此降低扭杆轴应力可增大扭臂中心距、减少扭杆支撑位置至连杆中心距离、采用更长的扭杆轴、减少连杆跨距等方式。同时以某型扭杆进行了实例分析优化,优化后扭杆轴最大应力下降39.8%,大大提高了扭杆轴安全系数,并采用有限元分析验证了优化结果,有限元分析与计算结果误差在5%以内,优化计算结果准确度较高。

The problem of how to arrange and install anti-roll torsion bar to reduce the stress of torsion bar after the roll stiffness of rail vehicles is determined,this paper deduces the relationship formula between the maximum stress of torsion bar and parameters of installation position.It is concluded that the maximum stress of the torsion bar is a decreasing function of the length of the torsion bar and the center distance of the torsion arm,and an increasing function of the distance between two connecting rods and the distance between the supporting position of the torsion bar and the center of the connecting rod.Therefore,stress of torsion bar can be reduced by increasing the center distance of the torsion arm,reducing the distance between the supporting position of the torsion bar and connecting rod,adopting a longer torsion bar,reducing the distance between two connecting rods.This paper takes a certain type of torsion bar as an example to analyze and optimize,the maximum stress of the torsion bar is reduced by 39.8%after optimization,which greatly improves the safety factor of the torsion bar.The optimization results are verified by finite element analysis,the error of the finite element analysis and calculation results is within 5%.