基于疲劳寿命的履带车辆侧减速器传动轴结构优化

Structural optimization of tracked vehicle's side-reducer drive shaft based on the fatigue-life prediction

针对某型履带车辆侧减速器传动轴的结构优化问题,结合疲劳寿命预测方法对传动轴不同结构尺寸的寿命进行比较,从而实现优化设计。首先利用虚拟样机仿真技术在ADAMS.ATV中建立车辆行走系统虚拟样机模型及路面不平度模型,通过仿真得到车辆行驶约束反力矩,将约束反力矩导入随后建立的侧减速器模型,得到传动轴在不同路面条件下的动态载荷。利用得到的动态载荷结合传动轴应力分析得到不同条件下的疲劳寿命预测值,进一步对传动轴不同内外径比值情况下的疲劳寿命变化情况进行了分析,研究结果可以作为一种履带车辆部件在一定约束条件下的结构优化问题的有效方法。

In this article,for the structural optimization of tracked vehicle’s side-reducer drive shaft,the fatigue-life prediction method is adopted to compare the life of drive shafts with different structures and dimensions.Firstly,both the virtualprototype model and the road-roughness model of the vehicle’s walking system are set up in ADAMS.ATV based on the virtualprototype simulation.The constraint counter torque of the vehicle’s travelling system is identified,and then it is introduced into the subsequently-built side-reducer model to obtain the drive shaft’s dynamic loads under different road conditions.In conjunction with the stress analysis,the values of fatigue-life prediction under different conditions are obtained,and the fatiguelife changes under different ratios of inner and outer diameters are further analyzed.The results provide an effective method for the structural optimization of tracked vehicle’s components under certain constraints.