A Study On Static And Dynamic Characteristic Of The Load-sensing Swash Plate Axial Variable Piston Pump

The load-sensing swash plate axial variable piston pump is widely used in electromechanical equipment and military equipment because of its obvious effect of energy saving, high power density, high pressure and high efficiency. The swash plate of general load-sensing swash plate axial variable piston pump easily occur mechanical vibration under the action of the high frequency alternating hydraulic torque, this has important impact on the control performance, stability and response speed of the pump.In order to improve the dynamic characteristics of the load-sensing swash plate axial variable piston pump, this paper adopts the eccentric distance installing form, then does some theory analysis of this pump, obtains the torque of the swash plate and the static working point of the pump through numerical method and analyzes the dynamic characteristics of the load-sensing system controlled by the load-sensing swash plate axial variable piston pump.The main content of this paper includes: In chapter 1, the overseas and domestic research status of the load-sensing swash plate axial variable piston pump is summarized, the research background and significance of this study are discussed, and the research focus of this study is established. In chapter 2,the mathematical model of the eccentric distance load-sensing swash plate axial variable piston pump is built, the effect regular of eccentric distance on the torque of the swash plate is got, and the effect of eccentric distance on the mechanical vibration of swash plate and dynamic characteristics of the pump. In chapter 3, the linearized model of the eccentric distance load-sensing swash plate axial variable piston pump is built, the static working point of the pump is calculated by numerical method. In chapter 4, the static working point of the load-sensing valve is calculated by the transient CFD method; then the model in frequency domain of the eccentric distance load-sensing swash plate axial variable piston pump is built, the dynamic characteristics of the load-sensing system is analyzed in frequency domain and the effect of the pressure, dip angle of the pump and the opening of the throttle valve on the dynamic characteristics of the system is received. Last chapter summarizes some conclusions in this thesis and suggests the future research proposals.