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基于刚柔耦合多体系统动力学和疲劳累积损伤理论,通过多软件构造协同仿真平台建立了以行星机构为柔性件的薄煤层采煤机多体模型。通过对模型进行动力学仿真分析发现:截割部行星架主要发生弯曲变形和扭转变形,主应力值均在其材料的许用应力范围之内,强度方面满足要求,可靠性较高;牵引部行星架输出端花键根部与退刀槽连接处受力较大,存在局部应力集中现象。对动力学仿真结果中行星机构关键节点的原始载荷谱进行雨流计数和外推处理后,分析其疲劳寿命,得到了疲劳寿命循环次数和疲劳寿命云图。分析结果为研究复杂条件下结构的动应力分布和疲劳寿命提供了新的方法。
Based on the rigid-flexible multi-body system dynamics and fatigue cumulative damage theory, a multi-body model of thin coal seam shearer with a planetary mechanism as a flexible member was established by using a multi-software structure co-simulation platform. Through the dynamic simulation analysis of the model, it is found that the main planets of the cutting unit mainly undergo bending and torsional deformation, the principal stress values are within the allowable stress range of the materials, and the strength meets the requirements and the reliability is high. The traction unit Planetary carrier output spline root and undercut stress greater stress, there is the phenomenon of local stress concentration. The original load spectra of the key nodes of the planetary mechanism were counted and extrapolated by rain flow in the dynamic simulation results. The fatigue life was analyzed, and the number of fatigue cycles and the fatigue life curve were obtained. The results provide a new method for studying the dynamic stress distribution and fatigue life of structures under complex conditions.