Nonlinear dynamic behavior of a flexible asymmetric aero-engine rotor system in maneuvering flight

Gao, Tian; Cao, Shuqian; Sun, Yongtao

doi:10.1016/j.cja.2020.04.001

Cited by 33 publications

(9 citation statements)

References 18 publications

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“…For the safe operation of the rotating machinery, the rotation angle β of the raft should not be too large, so there are approximate expressions 20,26 Finally, the differential equations of the system can be obtained in which m 1 is the mass of the rotor, e 1 is the rotor eccentricity, and ω is the rotating speed of the rotor; F x and F y are oil film reaction forces; m 2 is the mass of raft, and J 2 is the polar moment of inertia of the raft; k normalv and k v 1 denote the vertical linear and cubic nonlinear stiffnesses, respectively; k normalh and k h 1 denote the horizontal linear and cubic nonlinear stiffnesses of airbags, respectively; and c normalv and c normalh are the vertical and horizontal linear damping factors of airbags.…”

Section: Dynamic Model Of the Systemmentioning

confidence: 99%

Nonlinear dynamics of the rotor system with a floating raft isolation structure under the coupled motion of ship heaving and rolling

Xie

Wang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part K:

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A floating raft isolation structure is adopted to reduce the vibration of the marine rotor-bearing system, however, the system on the moving hull will be affected by the ship implicate motion, and its vibration will be difficult to predict. In this study, a dynamic model of the system under heaving and rolling coupled motion is established after considering the nonlinear oil film reaction force, unbalance inertia force, restoring force of the structure and inertia force of the ship motion. A numerical method is introduced to present the responses of the system, such as the amplitude and rotating speed curve, waterfall diagrams, and the rotor orbit and its Poincaré maps, etc. Moreover, the effects of rotating speed, amplitudes and frequencies of the coupled motion on the dynamic behaviours of the system are studied. The results indicate that the unstable region of rotating speed of the system increases under the coupled motion, the vibration of the system is greatly affected by the parameters of coupled motion, and the vibration amplitudes of rotor and raft can be effectively limited due to the displacement restrictor.

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Section: Dynamic Model Of the Systemmentioning

confidence: 99%

Nonlinear dynamics of the rotor system with a floating raft isolation structure under the coupled motion of ship heaving and rolling

Xie

Wang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part K:

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“…The structure diagram of the journal bearing, see in Figure 3. The transient oil film pressure distribution p ( θ , z ) satisfies the Reynolds equation 10,11,14,18…”

Section: Dynamic Modelmentioning

confidence: 99%

“…Furthermore, Qiu et al 8 and Yi et al 9 established a finite element model of the rotor-bearing system under base angular motion and studied its dynamic behavior considering the effect of time base angular motion on the dynamic behaviors of the asymmetric rotor-bearing system. Considering the effect of base motion, a dynamic equation of rotor system supported by squeeze film damper under base excitation was established by Chen et al, 10–12 and the dynamic characteristics of the system were studied, and Gao et al 13,14 analyzed the dynamic characteristics of aero-engine rotor system under maneuvering flight from theoretical simulation and experimental perspectives. The above researches are all about the dynamic behaviors of the rotor-bearing system considering base motion in the airborne field.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear vibration behaviors of marine rotor system coupled with floating raft-airbag-displacement restrictor under ship heaving motion

Xie

Wang

2021

Advances in Mechanical Engineering

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To study the nonlinear vibration behaviors of rotor system coupled with floating raft-airbag-displacement restrictor under ship heaving motion, the dynamic model is established considering the effect of heaving motion, its steady-state responses are numerically obtained using Runge-Kutta method and the results are surveyed by tools such as the spectrum waterfall diagram, time-domain response, frequency-domain response, axis orbit, and Poincaré map. The effects of rotating speed, ship heaving amplitude, and its frequency on the nonlinear dynamic behavior of the system are mainly studied. The results show that the responses of the rotor and raft are of obvious nonlinear behaviors such as amplitude jumping, bifurcation, and chaos due to the effects of nonlinear oil film force and ship heaving motion. With the increase of rotating speed, the motion of rotor and raft presents quasi-periodic and chaotic vibrations. Ship heaving amplitude and its frequency all have great effect on the vibration of rotor and raft; as heaving amplitude or frequency increases, the motion state of rotor and raft changes, and the amplitude of raft increases significantly. The displacement restrictor can effectively limit the vibrating displacements of the raft when ship heaving amplitude or its frequency is large.

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“…e subharmonic resonance and irregular motions caused by maneuver were observed. Gao et al [17] established a flexible asymmetric rotor system with ball bearings and SFD during maneuver flight. e vibration characteristics in conditions of accelerative motion, angular motion, and pitching flight were studied.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Behavior Analysis of Intermediate Bearing‐Squeeze Film Dampers‐Rotor System under Constant Maneuvering Overload

Zheng

Chen

Luo

et al. 2021

Shock and Vibration

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Under the flight maneuvering of an aircraft, the maneuvering load on the rotor is generated, which may induce the change of dynamic behavior of aeroengine rotor system. To study the influence on the rotor dynamic behavior of constant maneuvering overload, a nonlinear dynamic model of bearing-rotor system under arbitrary maneuver flight conditions is presented by finite element method. The numerical integral method is used to investigate the dynamic characteristics of the rotor model under constant maneuvering overload, and the simulation results are verified by experimental works. Based on this, the dynamic characteristics of a complex intermediate bearing-squeeze film dampers- (SFD-) rotor system during maneuvering flight are analyzed. The simulation results indicate that the subharmonic components are amplified under constant maneuvering overload. The amplitude of the combined frequency components induced by the coupling of the inner and outer rotors is weakened. The static displacements of the rotor caused by the additional excitation force are observed. Besides, the period stability of the movement of the rotor deteriorates during maneuver flight. The design of counterrotation of the inner and outer rotors can effectively reduce the amplitude of subharmonic under constant maneuvering overload.

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Nonlinear dynamic behavior of a flexible asymmetric aero-engine rotor system in maneuvering flight

Cited by 33 publications

References 18 publications

Nonlinear dynamics of the rotor system with a floating raft isolation structure under the coupled motion of ship heaving and rolling

Nonlinear dynamics of the rotor system with a floating raft isolation structure under the coupled motion of ship heaving and rolling

Nonlinear vibration behaviors of marine rotor system coupled with floating raft-airbag-displacement restrictor under ship heaving motion

Dynamic Behavior Analysis of Intermediate Bearing‐Squeeze Film Dampers‐Rotor System under Constant Maneuvering Overload

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