Nonlinear vibration and stability analysis of a flexible rotor-SFDs system with cubic nonlinearity

Ri, Kwangchol; Jong, Yongson; Yun, Cholil; Kim, Kwangchol; Han, Poknam

doi:10.1007/s11071-022-07616-y

Cited by 6 publications

(1 citation statement)

References 25 publications

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“…And this mathematical model is used to study the influence of bearing seat misalignment, coupling misalignment, and unbalance factors on the response of the rotor system at different speeds. Ri et al [13] studied the influence of third-order nonlinear factors on the response of the rotor system. The research shows that the third-order nonlinear factors have a greater influence on the rotor response near the second-order critical speed.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Dynamic Responses of a Rotor-Bearing System with Eccentric Squeeze Film Dampers

Han

Chen

Liu

et al. 2023

International Journal of Aerospace Engineering

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A squeeze film damper (SFD) is a commonly used component in aeroengine support structures. However, eccentric SFDs are often employed in practical applications. Existing research in this field has mainly focused on simple rotor models and frequency-domain solution techniques. In this study, a rotor system tester with and without an eccentric SFD was built, and a simulation model based on the finite element method and fixed interface modal synthesis method was proposed. Then, the nonlinear dynamic response of the rotor system during run-up and run-down was studied based on the tester and simulation model. The results show that an eccentric SFD affords zero frequency and a series of double frequencies in the rotor system response. An eccentric SFD may cause the increase of the critical speed, amplitude jump, and displacement amplitude oscillation of the rotor system during run-up/run-down. Additionally, it may cause the acceleration response at the mounting bracket to significantly increase when the rotor system is suddenly accelerated.

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Section: Introductionmentioning

confidence: 99%