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针对挖掘机载荷谱难以实测获取,从而难以对其工作装置进行疲劳分析的问题,提出一种新的解决方法:首先通过对铲斗挖掘土壤过程进行仿真,获得挖掘阻力的完整变化过程,即挖掘阻力载荷谱;然后通过整机作业过程仿真,获得与上述挖掘阻力载荷谱相对应的工作装置各铰点载荷谱,并通过实测油缸压力进行对比验证;最后以经过验证的各铰点载荷谱实现工作装置的动臂和斗杆疲劳寿命分析。以某23t液压反铲挖掘机为例,详述了采用上述方法对其工作装置进行疲劳分析的过程,计算出动臂和斗杆在典型作业循环工况下的最低疲劳寿命分别为10~(5.978)和10~(6.47)次,验证了所提方法的有效性。
Aiming at the problem that the load spectrum of excavator is difficult to obtain by actual measurement, it is hard to analyze the fatigue of its working device. A new solution is proposed. First, the complete process of excavation resistance is obtained through the simulation of bucket excavation soil process, Then, the load spectrum of each hinge point of the working device corresponding to the load resistance spectrum of the excavation resistance is obtained through the simulation of the entire operation process and verified by the measured cylinder pressure. Finally, the load spectrum of each hinge point is verified Fatigue life analysis of boom and arm of working equipment. Taking a 23t hydraulic backhoe as an example, the fatigue analysis of the working equipment by the above method is described in detail. The minimum fatigue life of the boom and stick under typical working cycle conditions is calculated as 10 ~ (5.978 ) And 10 ~ (6.47) times, the validity of the proposed method is verified.