Abstract
Squeeze film damper (SFD) is widely used in the vibration suppression of aeroengine rotor systems, but will cause complex motions of the rotor system under specific operating conditions. In this paper, a lumped-mass dynamic model of the high-pressure rotor system in an aeroengine is established, and the nonlinear stiffness and damping formula of SFD are introduced into the above model. The vibration responses of the rotor system under different rotating speeds and with different unbalances are investigated numerically, and the influence of SFD on the rotor system vibration and the change of suppression ability are compared and analyzed. The results show that in the case of high speed, together with a small unbalance, the rotor system will perform a complex vibration or a bistable vibration due to SFD. If the unbalance is properly increased under the same case of high speed, the vibration of the rotor becomes single-harmonic and the bistable vibration disappears. The research results can provide a helpful reference for analyzing complex vibration mechanisms of the rotor system with SFD and achieving an effective vibration suppression through unbalance regulation.
Highlights
Squeeze Film Damper (SFD) is frequently used for the vibration reduction of rotor systems in aeroengines
Chen [15] established the motion equation of a rotor-SFD system composed of the equivalent stiffness of the elastic-supported combined structure and the by using π oil film model with fluid inertia, and obtained the bifurcation equation of the nonlinear damping coefficient of the squeeze film damper at 4# fulcrum
Rotor Zhang [23] focused on the ability of the elastic ring of ERSFD to effectively adjust the dynamic pressure of oil film and suppress the nonlinear vibration of the rotor system
Summary
Squeeze Film Damper (SFD) is frequently used for the vibration reduction of rotor systems in aeroengines. The influence of SFD on rotor systems is very significant, and it is an important vibration reduction element of many rotating machinery, such as aeroengines. The oil film force of SFD has obvious nonlinearity, and the linearization equivalent has shortcomings, causing many vibration phenomena which cannot be explained reasonably. Theoorder to reveal the bounded complex vibration and bistable vibration of the rotor system retical and experimental studies show that the introduction of SFD can improve the caused by SFD and influence unbalance on unstable dynamic stability of the the law rotorofsystem in aof large speed range and thevibration, ability to the bearresponse serious of the rotor forces; systemhowever, under different unbalances different rotational were studunbalanced there are nonlinearand dynamic behaviors suchspeeds as subharmonic, ied.
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