Design method of squeeze film damper for aero-engine rotors

The design process and method of squeeze film damper (SFD) for aero-engine were proposed, in which the relationship between the dynamic characters of rotors and the SFD design parameters was taken in consideration. The rotor parameters include damping ratio, setting of critical speeds, maximum unbalance, vibration peak and force transmitted to foundations, etc, and the SFD design parameters include the eccentricity ratio, radial clearance and length of the film as well as rotor cage stiffness. The design was made for purpose of control of the critical peak value and force transmitted to foundations. The damping ratio and maximum unbalance of the rotor were found to be critical parameters for the SFD design. Numerical and experimental verification were carried out based on a rotor system. Results show that vibration attenuation of critical vibration peak can be reduced by 60%, and the correctness and effectiveness of the method provide a guideline for the SFD design.