Simulation And Analysis Based On The VPT For The Four-Assignment-Widow Axial Piston Hydraulic Motor

With the development of economic globalization and the "The Belt and Road" initiative was recognized by more and more countries,the global infrastructure is ushering in a rapid development,and the demand of construction machinery is becoming more and more strong.As the main power component of the hydraulic system,axial piston motor is widely used in the fields of engineering machinery and other fields.A new axial piston motor,the four assignment window axial piston hydraulic motor,is put forward in view of the widespread energy recovery from the system to the operation mechanism and the defects of other energy storage methods in the field of construction machinery.For the particularity of the four assignment window axial piston hydraulic motor structure,Some problem can not be detected by analysis of test methods,such as piston leakage,contact force and stress distribution,etc,and for the problems of high experimental cost and long development cycle of the four assignment window axial piston hydraulic motor,a simulation experiment method of the virtual prototype is proposed.Firstly,a 3D dynamics model and a 1D hydraulic system model are built by RecurDyn and AMESim;Secondly,some geometric model of the four assignment window axial piston hydraulic motor was meshed by HyperMesh to generate finite element file to replace the original rigid body model,then,the multi-flexible-body dynamics model based on FFlex is built in RecurDyn;The modal analysis of part of the geometric model of the four assignment window axial piston hydraulic motor is performed by ANSYS,generating modal flexible file(RFI file)to replace the original rigid body model,then,the multi-flexible-body dynamics model based on RFlex is built in RecurDyn;Next,by the interface technology for RecurDyn and AMESim,RecurDyn_Cosim interfaces is built,and the key parameters' information can be Communicated and shared in real time,such as,through the pressure sensor of AMESim,model of hydraulic system transfers pressure to the piston chamber of dynamic model,through the built in AMESim interface of the RecurDyn,the dynamic model transfers piston displacement,piston velocity,piston angular displacement relative TDC to the hydraulic system model,etc,so the virtual prototype is completed.Finally,we obtain dynamic characteristics,dynamic stress and strain and the contact force between piston and cylinder under different working conditions by solving the multi-flexible-body dynamics and finite element analysis,mostly,through the comparative analysis of the simulation results,we get the most appropriate dynamic characteristics and dynamic stress distribution to realize the virtual prototype simulation experiment,which provides an important reference and gist for experimental research,characteristic analysis,structural optimization and fatigue reliability prediction,etc.