Nonlinear response analysis for a dual-rotor system supported by ball bearing

Lu, Zhenyong; Zhong, Shun; Chen, Huizheng; Wang, Xiaodong; Han, Jiajie; Wang, Chao

doi:10.1016/j.ijnonlinmec.2020.103627

Cited by 36 publications

(7 citation statements)

References 38 publications

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“…Several physical parameters were examined to show how their uncertainty affects the nonlinear vibrations at various rotational speeds. Lu et al 30 concentrated on a dual-rotor system supported by a rolling element bearing, the ball bearing’s nonlinear properties like time-varying stiffness and primary resonance were concerned. The results showed that when the ball bearing's clearance raised, the system's stiffness and the rotation speed for forced resonance decreased.…”

Section: Introductionmentioning

confidence: 99%

Combination resonance and primary resonance characteristics of a dual-rotor system under the condition of the synchronous impact of the inter-shaft bearing

Zuo

Hou

Lin

et al. 2023

Sci Rep

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The internal structure of many aero-engines is designed with a dual-rotor system. Up to now, there have been few studies on the influence of aerodynamic excitation on the dual-rotor system. The phenomenon of synchronous impact may occur when the frequency of the aerodynamic excitation force of the fan blade is close to the characteristic frequency of the inter-shaft bearing. This paper investigates the dynamic characteristics of a dual-rotor system under the condition of synchronous impact. The system's motion equations are formulated considering the complex nonlinearities of the inter-shaft bearing, such as Hertz contact force of 10/9 exponential function, clearance, and periodic varying compliance. In addition, the inter-shaft bearing with a local defect is considered. The fan blade’s aerodynamic excitation force is modeled by synthesizing multiple harmonic excitation forces, the amplitudes of which are obtained by the Fourier series expansion. Numerical simulations are employed to get the dynamic responses of the system. The results show that the dynamic characteristic of the dual-rotor system at the primary resonance caused by the high-pressure (H.P.) rotor is not changed by the aerodynamic excitation force, while the primary resonance caused by the low-pressure (L.P.) rotor increases significantly. However, three aerodynamic resonances of the amplitude-frequency response of the dual-rotor system are emerging in the low-frequency region (124, 146 and 186 rad/s). When the synchronous impact phenomenon occurs, the amplitude of the three resonance peaks will increase twice compared to the original status, leading to a doubled increase in the dynamic load of the inter-shaft bearing. The characteristics of the dual-rotor system affected by the parameters such as initial phase difference of local defect, rotor eccentricity of system, clearance of inter-shaft bearing, and the stiffness and damping of supports are discussed in detail. The results obtained provide a deep insight into the mechanism of synchronous impact.

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Section: Introductionmentioning

confidence: 99%

Combination resonance and primary resonance characteristics of a dual-rotor system under the condition of the synchronous impact of the inter-shaft bearing

Zuo

Hou

Lin

et al. 2023

Sci Rep

View full text Add to dashboard Cite

show abstract

“…This type of dual-rotor system can be divided into a higher-pressure rotor and a lower-pressure rotor, connected by an inter-shaft bearing. Importantly, the rotors are supported and connected by bearings to stator structures, such as rolling bearings [1,2] and journal bearings [3,4]. Due to the nature of contact reaction forces in such bearings, the dynamic characteristics exhibit nonlinearities [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Vibrations of an Uncertain Dual-Rotor Rolling Bearings System with Coupling Misalignment

Yang

et al. 2022

J Nonlinear Math Phys

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In this paper, the nonlinear vibration responses of a dual-rotor system supported on the ball bearings considering coupling misalignment are investigated with inevitable uncertainties included. Moreover, uncertain parameters are modelled by non-probabilistic interval variables, alleviating the hash demands in fitting into a sophisticated probability law. It is then more suited for engineering problems that have sparse prior data on uncertainties. The deterministic vibration responses, orbits and frequency spectrum are provided first to exhibit the evolution of the vibrations. Then, several physical parameters are studied to reveal the effects of their uncertainty on the nonlinear vibrations at different rotating speeds. It is worth noting that uncertainty in the speed ratio between the higher-pressure and lower-pressure rotors has great impacts. Moreover, the sensitivity also depends on the rotating speed.

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“…Because of the high working rotating speed, the rotor structures in aeroengines [1][2][3] are supported by rolling bearings [4][5][6][7][8]. Rolling bearings are a type of main support for aeroengines and are a key source of vibration (parametric excitation) in rotor-bearing systems, which create a demand for vibration analysis and diagnostic techniques under various operating conditions [9].…”

Section: Introductionmentioning

confidence: 99%

Analysis on Multimode Nonlinear Resonance of an Asymmetric Rolling Bearing Rotor with the Application of a Squeeze Film Damper

Chen

Zhong

et al. 2021

Shock and Vibration

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Nonlinear response analysis for a dual-rotor system supported by ball bearing

Cited by 36 publications

References 38 publications

Combination resonance and primary resonance characteristics of a dual-rotor system under the condition of the synchronous impact of the inter-shaft bearing

Combination resonance and primary resonance characteristics of a dual-rotor system under the condition of the synchronous impact of the inter-shaft bearing

Nonlinear Vibrations of an Uncertain Dual-Rotor Rolling Bearings System with Coupling Misalignment

Analysis on Multimode Nonlinear Resonance of an Asymmetric Rolling Bearing Rotor with the Application of a Squeeze Film Damper

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