Study on vibration suppression of an aero-engine rotor system with adjustable oil film thickness driven by piezoelectric actuator through critical speed

Abstract

The squeeze film damper (SFD) is difficult to meet the vibration control requirements of the rotor at both the critical speed and other rotor speeds at the same time due to the fixed structural parameters. The control method of piezoelectric ceramic actuator (PZT) actively changing the SFD oil film gap is proposed to suppress the critical amplitude of the rotor system. The dynamic model of the rotor system with PZT is established. The mechanical controllable characteristics of SFD are revealed, and the vibration damping performance of the controllable SFD (CSFD) is studied at critical speed. Both experiment and theory show that the proposed method can effectively suppress the critical amplitude of the rotor system with different imbalance.