Research of Nonlinear Vibration of Aero-Engine in Windmilling Imbalance with Wing Degree-of-freedom

Abstract

Abstract. The rotor non-isotropic produced nonlinear vibration of aero-engine in windmilling would cause serious danger to flight security. So the research of vibration character in windmilling should go further. In this paper, the kinematic equation of the rotor/stator/wing system is established based on Jeffcott rotor and flexible supported stator interaction system. Afterwards, the nonlinear kinematic differential equation is solved with state space method and both the amplitude of wing and orbit of rotor/stator in different twirling speed are obtained. The result has presented that the rotor non-isotropic will evoke larger amplitude of rotor/stator in lower windmilling speed and increase the probability of flight disaster if wing DOF is considered.