Construction Method for Accelerated Fatigue Reinforced Pavement of Crawler Excavator Based on User Operating Conditions

doi:10.3901/JME.2022.16.319

Abstract

Abstract: 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.

Key words: crawler excavator, oil tank, user operating conditions, accelerated fatigue, fatigue damage spectrum, multibody dynamic simulation, reinforced pavement

CLC Number:

U415

SUN Shulei, LEI Lifei, HUANG Haibo, ZHANG Shaobo, TIAN Guoying, DENG Pengyi. Construction Method for Accelerated Fatigue Reinforced Pavement of Crawler Excavator Based on User Operating Conditions[J]. Journal of Mechanical Engineering, 2022, 58(16): 319-328.

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