Optimization Design of High-Pressure Simulated Rotor

Combined elastic support which include squirrel cage and squeeze film damper (SFD) are widely used in aero-engines, gas turbine, and steam turbine. Squirrel cage can vary the critical speed and strain energy distribution of the rotor system by changing the stiffness. SFD can effectively suppress rotor vibration and reduce transmitted forces. Given the inherently nonlinear behavior of SFD, a poorly designed damper has the potential to exacerbate rotor vibrations, posing a significant safety risk to engine operation. The influence of axial width of the SFD on dynamics behavior of the rotor-SFD system, such as critical speed, mode shape, vibration response has been developed in this paper. The Newton method was employed to optimize the critical speed and vibration response. The results of optimization reduced the 2nd critical speed by 24%, reduced the vibration amplitude of acceleration by 92%, and reduced the vibration amplitude of displacement by 88.3%. The contents and methods of this paper can provide guidance for the vibration optimization of rotor-squeeze film damper system.