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结合采煤机力学特性测试实验,使用合并未知量,多次求解的方式对采煤机左牵引部空间力学模型超定方程进行求解,获得机身联接螺栓剪切载荷谱;利用获得的机身联接螺栓剪切载荷谱进行功率谱密度分析,使用雨流计数法对载荷谱进行编制,获得载荷谱频域特性与时域连续特性;结合螺栓载荷谱,通过静载分析与疲劳仿真分析,并考虑间隙影响条件,分析结果显示螺栓剪切疲劳起裂区域为螺纹配合起始部分,疲劳寿命约为5 625.68 h;仿真结果证明,在一定条件下仿真模拟可以达到反映真实条件下采煤机螺栓剪切疲劳损伤演化过程的目的。
According to the test of mechanical characteristics of shearer, the overdetermined equation of space mechanics model of left traction part of shearer was solved by using unknowns and multiple solutions, and the shearing load spectrum of fuselage bolts was obtained. Power spectrum density analysis was carried out on the shear load spectrum of the coupling bolt. The load spectrum was calculated by using the rain flow count method to obtain the frequency domain characteristics and the time domain continuous characteristics of the load spectrum. By combining the bolt load spectrum, the static load analysis and the fatigue simulation analysis, Considering the influence of clearance conditions, the analysis results show that the fatigue crack initiation area of the bolt is the starting part of the thread mating, and the fatigue life is about 5 625.68 h. The simulation results show that under certain conditions, The purpose of shear fatigue damage evolution process.