Research On Transmission Path Of Mechanical Vibration Of Axial Piston Pump Based On Structural Admittance Method

The axial piston pump is one of the important power components of the hydraulic system,and it plays an extremely important role in the hydraulic system.When the axial piston pump works in the hydraulic system,it will produce vibration,and the vibration will be transmitted to other parts,which will bring certain hidden dangers to the hydraulic system.Due to its own complex structure and nonlinear coupling characteristics,it has brought many scientific problems to the vibration and noise reduction of the axial piston pump.Therefore,with the goal of analyzing the vibration characteristics of the axial piston pump,exploring the mechanical vibration mechanism of the axial piston pump and the characteristics of its vibration transmission path,the purpose is to provide a theoretical basis for the axial piston pump to reduce vibration and noise.The main research work is as follows:(1)Taking the axial piston pump as the object,under the eccentric and unbalanced conditions of the rotating body of the pump,based on the analysis of the internal structure and connection mode of the axial piston pump,a physical model of the vibration transmission of the axial piston pump is established.Combining the structural admittance theory,the pump is divided into three sub-structure models(vibration source-vibration transmission path-vibration receptor),and dynamic modeling of the three sub-models is carried out to obtain the admittance of the axial piston pump substructure.Matrix,further established the overall vibration dynamics model of the pump.(2)Based on the power flow theory,MATLAB programming is used to solve the overall dynamics model of the pump,and the system mechanical vibration power flow and the power flow on each transmission path of mechanical vibration are obtained,and the main transmission path is obtained by further analysis;for the axial piston pump machinery The path contribution of each transmission path of vibration is analyzed,and the main transmission path is identified.Based on the finite element power flow method,the vibration power flow of the axial piston pump is analyzed,and the power flow distribution law of the axial piston pump is obtained.It is compared and analyzed with the above results.(3)Using the axial piston pump casing as the vibration analysis receptor,establish the finite element analysis model of the pump casing,analyze the overall harmonic response of the pump casing,obtain the vibration characteristics of the pump casing,and find the main sensitive areas of the pump casing vibration.(4)By setting up an axial piston pump vibration test bench,the experimental conditions of the axial piston pump are set to 1460 r/min and the pump outlet pressure is 1 MPa,and the axial piston pump is carried out under this working condition.In the vibration test experiment,the measured vibration acceleration data on the surface of the front,middle,and rear pump casings were obtained,and the theoretical results and finite element analysis results were compared to verify the accuracy of the model.The research results are conducive to a deeper understanding of the mechanical vibration transmission characteristics of the axial piston pump,and provide a theoretical basis for the subsequent vibration and noise reduction of the axial piston pump.