Rigid-flexible Coupling Dynamics Simulation And Fatigue Analysis Of Key Components Of Heavy Tracked Walking Gear

Construction machinery plays an important role in the development of the national economy.Due to the large impact and load required,heavy construction machinery generally uses crawlers as its walking gear.The damage of the key components of the track during the work of the construction machinery will lead to the suspension of work and seriously affect the economic benefits.Therefore,the research on the key components of heavy track is particularly important.In this paper,the rigid-flexible coupling method is used to study the crawler excavator crawler running device of an open pit mine.The basic structure of the crawler walking device and its important components are introduced.The force of the crawler walking device during the working process is analyzed,and the driving torque of the track under the three conditions of straight road,hill climbing and in-situ steering is analyzed.And the driving power is calculated,the crawler walking device solidworks model is converted into a neutral file,imported into the multi-body dynamics software RecurDyn,the relevant constraints and contacts are set,the virtual prototype is modeled,and the relevant parameters are set.The three typical working conditions of the crawler walking device are simulated,and the driving torque of the driving wheel under each working condition is compared with the theoretical value to verify the rationality of the parameter setting.The rigid-flexible coupling theory is introduced.The drive wheel teeth are flexibly and imported into RecurDyn software.Combined with the previous parameter settings,the drive wheel is rigid-flexible coupled to simulate the maximum stress point on the drive wheel under three working conditions.The stress time history was analyzed.The rigid-flexible coupling simulation of the track frame was carried out,and the simulated dynamic stress results were compared with the experimental results.The theory of fatigue damage and the calculation method of fatigue life of mechanical parts are introduced.The fatigue life of heavy-duty crawler-driven wheel teeth under three working conditions in the Durability module of RecurDyn software is calculated by the simulation results of the rigid-flexible coupling model.The calculation and analysis were carried out,and the life cloud of the tooth was obtained and analyzed.The analysis results in this paper can be further optimized by the crawler belt.The rigid-flexible coupling method and fatigue analysis method are used to provide reference for similar problems in the future.