挖掘机工作装置疲劳分析方法  

Fatigue analysis method of working devices of hydraulic excavator

作　　者：邱清盈[1] 魏振凯 高宇[1] 冯培恩[1] 殷鹏龙 

机构地区：[1]浙江大学流体动力与机电系统国家重点实验室,杭州310027 [2]国机重工(常州)挖掘机有限公司,江苏常州213136

出　　处：《吉林大学学报（工学版）》2016年第1期159-165,共7页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家科技支撑计划项目(2013BAF07B04)

摘　　要：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。It is hard to measure the load history of the working device of hydraulic excavator in fatigue analysis.To solve this problem a novel fatigue analysis method is proposed.First,the complete change process of digging resistance,named Digging Resistance Load Spectrum（DRLS）,is obtained by simulating the digging process of soil with the bucket of hydraulic excavator.Second,according to the DRLS,the load history of each hinge of the working device is calculated by the operation simulation of a full typical working cycle of the excavator.The simulation results are then verified by comparing with the actual cylinder pressure measured from the experiment similar to the working condition in the simulation.Finally,the fatigue analysis of the boom and arm of the working device are accomplished with the verified load histories of the hinges.The effectiveness of the proposed method is demonstrated with the fatigue analysis process of the working device of a 23 thydraulic backhoe excavator.The results come out that the minimum lives of the boom and arm are 10^5.978 and 10^6.47 cycles respectively.

关 键 词：矿山机械工程 疲劳分析 任意拉格朗日-欧拉算法 液压挖掘机 工作装置 

分 类 号：TD42[矿业工程—矿山机电]