Stiffness characteristics analysis on high-pressure rotor front bearing of aero-engine

In order to get the variation law of aero-engine high pressure rotor front bearing's stiffness which is changed with the aero-engine working states, a stiffness analysis model for the bearing was established. The effects of outer and inner ring assembling parameters, centrifugal effect, thermal effect and combined loads on bearing stiffness characteristics were considered. The variation law of the bearing stiffness, which is changed with the outer and inner ring assembling parameters, the rotating speed, the bearing working temperature and the external applied load, was analyzed by numerical analysis. The results show that, the bearing radial stiffness, axial stiffness and angular stiffness increase with outer and inner ring magnitude of interference increasing, and decrease with rotating speed, working temperature and moment load increasing. The bearing radial stiffness increases, and the bearing axial stiffness and angular stiffness decrease with radial load increasing. The bearing radial stiffness decreases, and the bearing axial stiffness and angular stiffness increase with axial load increasing, and the axial load has the greatest influence on the bearing stiffness.