摘要
为提高挖掘机疲劳强度安全可靠性,解决挖掘机用户作业工况及加速疲劳试验方法缺乏等问题,以挖掘机油箱为研究对象,基于等效损伤原则,通过用户工况调研、采石场试验测试、虚拟路面构建、多体动力学仿真、强化路面试验验证及疲劳损伤计算等一系列流程,提出一种基于挖掘机用户作业工况的履带式挖掘机加速疲劳强化路面构建方法。结果表明,采用爬碎石坡等共9种采石场试验测试工况表征用户作业工况,可获得量化的工况测试数据及目标总损伤;基于多体动力学构建的挖掘机动力学仿真模型及虚拟强化路面计算结果与真实强化路面试验测试结果较为吻合;基于该方法获得了与目标总损伤一致的多种不同的强化路面及不同档位速度组合工况,其中由0.3 m凸块间距1档、2 m凸块间距1档及15 m凸块间距1档3种工况所构成的强化路面组合工况较优,强化系数为15.1,该方法可大幅度降低挖掘机整机及关键零部件的疲劳试验时间。
In order to improve the fatigue strength safety and reliability of excavators,and solve the problems of the lack of the excavator user operating conditions and accelerated fatigue test methods,a construction method for accelerated fatigue reinforced pavement of crawler excavator based on user operating conditions is proposed with the excavator fuel tank as the research object,through a series of processes such as user condition investigation,quarry test,virtual pavement construction,multi-body dynamics simulation,reinforced pavement test verification and fatigue damage calculation.The results show that:9 quarry test conditions including climbing gravel slopes,and the quantified test data and target total damage are obtained.The excavator dynamics simulation model constructed based on multi-body dynamics and the calculation results of the virtual reinforced pavement are more consistent with the test results of the real enhanced pavement.Based on this method,a variety of different reinforced pavements and different gear speed combinations consistent with the target total damage are obtained.The operating condition composed of bumps interval 0.3 m and gear 1,bumps interval 2 m and gear 1,and bumps interval 15 m and gear 1 is better,and the intensified coefficient is 15.1.This method can be used for greatly reducing fatigue test time of the excavator and the key parts.
作者
孙树磊
雷丽妃
黄海波
张少波
田国英
邓鹏毅
SUN Shulei;LEI Lifei;HUANG Haibo;ZHANG Shaobo;TIAN Guoying;DENG Pengyi(Key Laboratory of Automobile Measurement and Control&Safety,Xihua University,Chengdu 610039;Engineering Research Center of Advanced Energy Saving Driving Technology,Ministry of Education,Chengdu 610031;Provincial Engineering Research Center for New Energy Vehicle Intelligent Control and Simulation Test Technology of Sichuan,Chengdu 610039;School of Mechanical Engineering,Southwest Jiaotong University,Chengdu 610031;Liugong Machinery Co.,Ltd.,Liuzhou 545007)
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2022年第16期319-328,共10页
Journal of Mechanical Engineering
基金
国家重点研发计划(2018YFB1201603)
四川省科技计划(22ZDYF3484,2020YFG0023,2021YFG0070,2020YFG0325,2019ZDZX0002)
先进驱动节能技术教育部工程研究中心开放研究课题资助项目
关键词
履带式挖掘机
油箱
用户工况
加速疲劳
疲劳损伤谱
多体动力学仿真
强化路面
crawler excavator
oil tank
user operating conditions
accelerated fatigue
fatigue damage spectrum
multibody dynamic simulation
reinforced pavement
