薄煤层采煤机可靠性分析与疲劳寿命预测

以刚柔耦合多体系统动力学理论为基础，建立了摇臂壳体和牵引部壳体为柔性件的采煤机刚柔耦合虚拟样机模型；根据滚筒工作阻力和采煤机主要技术参数，推导出了采煤机牵引阻力的取值范围，验证了动力学仿真分析中牵引阻力参数设置的正确性；基于Matlab编程，获得了前后滚筒的载荷文件，并通过ADAMS动力学仿真分析，发现了采煤机壳体的应力分布与变形情况，提出了改进措施；基于动力学仿真结果中壳体关键节点的主应力载荷，获得了用于疲劳寿命分析的载荷谱，通过疲劳寿命计算，得到了壳体的最小疲劳循环次数和疲劳损伤值，发现了壳体疲劳寿命的薄弱环节。为研究设备在大范围刚性运动与柔性构件小变形运动时的应力、变形和疲劳寿命情况提供了新的方法。

Thin seam shearer reliability analysis and fatigue life prediction

Based on theory of rigid flex coupled multi body system dynamics，a rigid flex coupled virtual prototyping model of shearer with flex rock arm shell and haulage unit shell was built.According to the drum working resistance and major technical parameters of the shearer，the value range of traction resistance has been derived，and then verified the correctness of the coefficient of traction resistance set on the dynamics simulation analysis.Based on the Matlab programming，obtained the load files of pre and post drums’，and through the ADAMS dynamics simulation analysis，found out the stress contour distribution and deformation of shear shell，and put forward the improvement measures.Based on the key nodes’ Von Mises stress load of shearer shell，load spectrum of fatigue analysis has been obtained.Through fatigue life prediction，shearer shell’s repeats and damages were obtained，and then found out the weak links.This paper provide a new approach for people to research equipment’s stress，deformation，and fatigue life while the equipment’s rigid components in large overall motion and flex components in small deformation motion.