Study On Mechanical Vibration Transfer Paths Model Of Axial-piston Pump

Axial-piston pump is one of the major components in hydraulic system. But it is also the main source of vibration in hydraulic system. The study of the generation and transfer laws of its vibration has an important significance to reduce the vibration of the whole hydraulic system. At present, the high performance axial-piston pump is developing in the direction of high speed and high pressure, which intensifies the problems of alternating load and high frequency shocks in the axial-piston pump, causing the vibration of pump increases, the friction pair service condition deteriorated, and a series of problems. This has brought serious challenges to the design and manufacturing of high performance axial-piston pump.The vibration of axial-piston pump mainly divides into two major categories of mechanical vibration and fluid vibration, and the mechanical vibration including the vibration of pump rotor eccentricity and imbalance, the vibration of the bearing and the vibration of swash plate-variable mechanism. In this paper the mechanical vibration of axial-piston pump is studied to explore the mechanical vibration transfer laws and the rule of vibration energy dissipation in axial-piston pump.In this paper the main research contents are as follows:In chapter 1, the research status of axial-piston pump vibration were summarized. And then the development and application status of transfer path analysis was mainly introduced. The main research content of this paper was determined.In chapter 2, the mechanical vibration form of axial-piston pump was introduced, and the pump rotor eccentricity and imbalance vibration as a single vibration source was studied. The axial-piston pump mechanical vibration transfer path model was established, including the physical model and mathematical model. Two main methods of the finite element analysis and experimental research were employed to determine the values of stiffness and damping in the model.In chapter 3, the Matlab programming solution was used to obtain the vibration of the pump housing. Based on the power flow theory, the path contribution of axial-piston pump mechanical vibration transfer path model was analyzed to identify the main transfer path. The vibration energy dissipation of the model was analyzed.In chapter 4, based on the first-order trajectory sensitivity theory, the sensitivity of parameters on the state variables was solved by programming to identify the main parameters.In chapter 5, in the working conditions of speed 1460r/min, pump outlet pressure 1MPa, the axial-piston pump vibration test experiment was performed to gain the pump shell vibration acceleration data.