The Dynamics Simulation Of Wheel Loader Working Device And The Fatigue Life Evaluation Of Movable Arm

The wheel loader working device is an important support mechanism,and the movable arm is the maximum load mechanism of working device.The working condition of movable arm is changeable,continued long working hours,under tremendous alternating load.The failure of movable arm will lead to failure of the entire working device,and even affect the entire machine.Therefore,the design of working device,particularly the design of movable arm is crucial in the design of the wheel loader.Taking the object of the ZL50C wheel loader working device and movable arm,this paper conducted the following research:First,a reasonable simplification wheel loader working device model was built,and used the UG software to establish three-dimensional models of movable arm,rocker arm,bucket,boom cylinder,the boom cylinder piston rod,turning cylinder,turning cylinder piston and connecting rod,and built the UG assembly model of working device through virtual assembly.Second,analyzed the normal load conditions(the initial load condition,insert conditions,the bucket turning conditions,transport conditions,movable arm lifting conditions and unloading conditions)and the partial load conditions of the working device,and used the multi-body dynamics simulation method,putting the assembly model UG working device into the.x_t format file saved by UG software,and put the.x_t format file ADAMS software,then establish working device virtual prototyping after the related parameter setting;and carried the work device multibody dynamics simulation,then get the kinematics simulation resultsthe of bucket shovel blade movement envelope,the process of bucket shovel blade height from the ground,and bucket shovel blade center distance;get the dynamics simulation results of insertion resistance,turning bucket resistance,material gravity,the load in the joint of movable arm connected to front frame,the load in the joint of movable arm connected to boom cylinder rod,the load in the joint of the movable arm and bucket and the joint of movable arm and rocker arm.And then,calculated the finite element load data base on the ADAMS simulation data with the method of coordinate transformation between the ADAMS coordinate system and Workbench coordinate system,and used Workbench modules to analyse movable arm finite element for each time after putting UG assembly model into ANSYS software,then get finite element analysis result of movable and verified the reasonableness of the design of movable ram under static conditions.Finally,the components S-N curves in different reliability was obtained by the modification of the material S-N curve,and get fatigue life of movable arm in different reliability through the fatigue life assessment based on the nodes load spectrum in dangerous parts and the corrected components S-N curve.The thesis research results provide a reference for thesis research and the design reference to wheel loader working device,and shorten development cycle of a new product design for the working device,to develop products service plans,and have important guiding significance for the assessment of remanufactured products remaining life of wheel loader.