Simulation Research On Dynamic Characteristics Of Axial Piston Pump

Axial piston pump is the most important power component in hydraulic systems.It is widely used in various types of machinery and equipment.It takes high cost and difficult to modify parameters if simply using the traditional physical experiment method in order to develop and design high performance piston pump.The calculation results are often differs from the actual results if the conventional numerical method is used,because of the obvious elastic deformation of some internal components of the piston pump and complex transmission of the fluid.The development of the virtual prototyping technology offers the possibility of accurately simulating complex systems.The dissertation study on the virtual prototyping technology coupled with the mechanical model and the hydraulic model of the axial piston pump.The purpose of the dissertation is to provide means for the structural design and optimization of the piston pump.It has a wide range of engineering applications and important academic research value.The dissertation builds the virtual prototyping simulation model of axial piston pump with rigid-flex coupling and solid-liquid coupling.The fluid characteristics,kinematics and dynamic characteristics of the axial piston pump are studied and analyzed through the simulation.The main research contents of the paper are as follows:(1)The equations of piston motion and flow pulsation are obtained based on the theoretical analysis of the structure and working principle of the axial piston pump.And the corresponding mechanical equations are obtained according to the force on the piston and the shaft.(2)The three-dimensional design software CREO is used to build the physical model of the pump based on the reasonable simplification of the structure of the axial piston pump.The rigid model of the piston pump is completed by the data transmission with the dynamics software ADAMS.Using the finite element software ANSYS as a flexible treatment to establish the rigid-flexible coupling dynamic model of the piston pump due to the significant elastic deformation of the internal components of the pump.(3)The power bond graph is obtained according to the mathematical model of the hydraulic system of the axial piston pump.Meanwhile the hydraulic model of components is established in the AMESim and the whole model is completed by combination and packaging.(4)The data exchange between the dynamic model of the piston pump and the hydraulic model is realized through the communication interface between ADAMS andAMESim,then the virtual prototype simulation model of the solid-liquid coupling of the piston pump is completed.(5)The effects of different conditions on the fluid characteristics of the piston pump is studied and analyzed through the dynamic simulation of the piston pump.It is found that the pulsation rate is inversely proportional to the swash plate angle,shaft velocity,load pressure and the volume of chamber.But,it is in proportion to the temperature.The pressure in the piston chamber increases with the increase of the load pressure.It is obtained that the frequency where the pulsation amplitude is the largest according to the corresponding spectral characteristic curves.(6)The kinematics and dynamics of the piston pump are studied and analyzed according to the simulation results of the virtual prototype.The results show that the variation of the movement of the piston and the comparison of the movement of the shaft before and after flexing.Besides,the stress and strain contour of the piston and the shaft.