Influence of Rotor Support Way on Dynamic Characteristic in the Hydraulic Motor Pump

The support way of the integrated rotor in hydraulic motor pump has a direct influence on dynamic characteristics of rotor due to its slender shaft.The rotor system of hydraulic motor pump was analyzed.A rotor system model of hydraulic motor pump was built by the function of mass property analysis in Pro/E and one-dimensional finite element models of four different support ways were set up by ANSYS.The rotor critical speed,frequencies,deflection change and corresponding modes were obtained by analysis and calculation of rotor dynamics.The results show that different support ways have an obvious influence on critical speed,natural frequencies,deflection and stiffness of the rotor.The stiffness of the rotor is increased markedly when the support point is closed to the rotor centroid or with several support points.The computational results provide theoretical guidance for the design of the rotor system of hydraulic motor pump.