Rigid-Flexible Coupled Simulation And Life Prediction For The Working Device Of The Hydraulic Excavator

With the rapid development of lightweight and remanufacturing technology,how to improve the remanufacturing or lightweight hydraulic excavator in the design process,and the rationality of structural reliability is the key to ensure the safety of the project and reduce the maintenance cost.This research is supported by the national science and technology support program(2011BAF11B01),and take the work device of hydraulic excavator as the research object.The real load condition of the boom is obtained by experiment and simulation,so that the fatigue life of dispatched arm can be estimated.The specific research process is as follows:First of all,the fatigue life prediction method of FE-SAFE fatigue analysis software is proposed by introducing the fatigue cumulative criterion,the method of load spectrum and the S-N curve of fatigue resistance.Secondly,introduces the ADAMS virtual prototype technology,combined with Stress test data of hydraulic excavator boom as well as the Mathematical model of working equipment,so that the boundary conditions of the ADAMS dynamics simulation,the displacement data of the oil cylinder and the digging resistance are obtained.Since then the load time of each hinge point on the boom structure is obtained by ADAMS rigid body dynamics simulation.Then,considering the deformation and displacement of boom structure in the work process,it is of great need to generate actuator MNF modal neutral file in Hypermesh,and lead into ADAMS to replace the rigid arm structure,keep the constraint conditions,then analyze the rigid flexible coupling virtual prototype dynamics simulation of excavator working device,compare the load time curve of the key hinge point of the simulation with the measured data and the simulation results of multi rigid body dynamics,which verifies the correctness of the virtual prototype model,and explain the necessity and accuracy analysis of flexible structure in the design stage of excavator.Finally,the load time history of each hinge point of the arm is taken as the load,and the finite element dynamic load analysis is carried out,meanwhile the results are input into FE-SAFE to predict the fatigue life.In order to realize the precise design of the strength and life of the component,and provide the basis for the lightweight design of the excavator.