Research On Design Method And Experimental Verification Of Two-dimensional Piston Pump

As high power density is one of the greatest advantages of fluid power technology and,makes it widely employed in industry,especially for drives and actuators in mobile applications.Among these applications,axial piston pumps are the most common as the “heart” of the hydraulic systems where heavy power and high pressure are required.However,the axial piston pumps still exist some ristrictions originate from the structures.Upon the background of National Foundation of Natural Sciences named “Research on Basic Theory of Two-dimensional(2D)Piston Pump and Electro-hydraulic Technology” and “Research on Design Procedures of High Pressure Sea Water Pump with Two-dimensional Piston Structures,the concept of highly integrated two-dimensional cartridge pump and related composite applications is adopted on account of the irreplaceable ristrictions originate from the structures of traditional axial piston pump.The advantages of two-dimensional cartridge pump is stated through the comparison with traditional axial piston pump,and the relevant research is conducted depend on the base components,include the unit pump and tandem pump.After designing and checking of the unit pump and tandem pump,the mathematical model of cam surface in unit pump is constructed depend on the compound law of motion of unit pump,and the mathematical model can not only direct the 3D modeling,but olso the theoretical analisis.Then,the programming of design methods depend on mathematical model of cam surface is researched.In the same time,the simulation model is programed in AMEsim in allusion to the two-dimensional catridge pump,its components(two dimensional pump set)and traditional axial piston pump are construted and the characteristics of them are analyzed.Besides,the structural flow ripple is compared between two dimensional pump set and traditional axial piston pump.At last,the mathematical model of cam surface are verified through the experiment of kinetic characteristic of two dimensional pump set,and the characteristic of zero structural flow ripple and high volume efficiency of catirge pumps are verified through the experiments about the no load flow characteristic.The main research works and results of this paper are as follows:(1)Depend on the problems of traditional axial piston pump,a two-dimensional cartridge pump origin from the two-dimensional theory is designed and its components are analyzed to avoid those ristrictions.(2)The analyzing of contacting relationgship in space is conducted,in allusion to the vital part of the two dimensional unit pump,namely the cam-follower motion transfer structure.Depend on the motion law of piston and through the step-wise decomposition of contacting relationgship in space,the incidence formulas are derived about the parameters stand for contacting relationgship,thus,the mathatical model of contact relationship is constructed.Originate the the mathatical model of contact relationship,the coordinates of contacting relationship between cam and follower in space is progamed through the program of Matlab,thus the mathatical model of contacting planar is deduced.In the same time,The program of design and optimization for the two-dimensional catridge pump and components is written in the program named Matlab,which depend on the mathatical model of contacting planar and the kinematic principle of the two-dimensional piston pump.(3)Construct the hydraulic system model and virtual prototype of two-dimensional catridge pump,its components(namely the tandem pump),and traditional axial piston pump in the program named AMESim.Analyze the flow characteristic of tandem pump and traditional axial piston pump.The characteristic of zero structural flow ripple of two dimensional catridge pump can be verified through the comperision between the analisis between tandem pump and traditional axial piston pump.Besides,analyze the possibility of realizing digital control of the flow in the two-dimensional catridge pump design with the idea of binary system.(4)The experimental study on the kinematic,flow and flow-pressure characteristics of a tandem pump is carried out by setting up an experiment table for the tandem pump.Analyze the kinematic characteristics of the piston in tandem pump by comparing the displacement signal of piston with the theoretical value,the displacement signal is collected by the highspeed data acquisition system.The kinematic characteristics of the piston and three dimensional scanning result of surface are combined to validate the mathematical model.The clutter in data of the flow with low pressure is filtered by the band-pass filter constructed in the program of Matlab after the spectral analysis.The experiment result through the band-pass filter can verify that the two dimensional catridge pump can vanish the structural flow ripple.At last,the flow and flow-pressure characteristics of the tandem pump verify that it has a high volumetric efficiency.In conclusion,it is the first time to propose the idea of two dimensional catridge pump and do theoretical,simulation and experimental research on its components named two dimensional pump set.After the design and verification,the mathematical model of the contact surface in motion transfer machanisim is constructed.This mathematical model can guide the design and optimization of the two dimensional piston pumps in different types and laws of motion,and provides theoretical basis for the research of kinematics.Besides,the characteristic of zero structural flow ripple and high volumetric efficiency of two dimensional catridge pump is verified through the theoretical analysis,simulation study and the frequency spectrogram analysis of experiment result.