Nonlinear resonance characteristics of a dual-rotor system with a local defect on the inner ring of the inter-shaft bearing

Yi, Haiming; Hou, Lei; Gao, Peng; Chen, Yushu

doi:10.1016/j.cja.2020.11.014

Cited by 39 publications

(5 citation statements)

References 11 publications

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“…Based on the above reasons, the Hertz restoring force modelling can be considered in the model to solve the vibration characteristics of the bearing 40 – 42 . Figure 2 shows a simplified schematic representation of the inter-shaft bearing, ɷ 1 is the rotation speed of the inner race, ɷ 2 is the rotation speed of the outer race, ɷ c is the rotation speed of the cage, δ e is the depth of the defect, and l e is the defect’s span.…”

Section: Dynamic Modelling Of the Dual-rotor Systemmentioning

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: Dynamic Modelling Of the Dual-rotor Systemmentioning

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

Self Cite

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show abstract

“…For example, based on local defect of inner ring of intermediate bearings, Yi Haiming, et al, studied the nonlinear resonance characters of dual-rotor system. 3 Deng Wei, et al, took advantage of running feature of inner and outer ring rotating together and proposed a local fault sideband difference diagnosis method to diagnose a local fault of intermediate bearings. 4 The vibration signals from real failure of intermediate bearings in aircraft engine are usually far more complex and take on non-stationary traits.…”

Section: Introductionmentioning

confidence: 99%

A novel method to identify the multiple faults of intermediate bearing based on multiscale Lempel–Ziv complexity enhancement

Guo

Cong

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part G:

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In order to solve the difficulty to correctly identify a compound failure in intermediate bearing of aircraft engine, the paper has brought forward the method of strengthening fault feature information of intermediate bearing with weighted multiscale Lempel–Ziv complexity parameter. The method works by combining multiscale Lempel–Ziv complexity parameter (M-LZC) with wavelet transform (WT) and singular value decomposition (SVD) and implements the feature extraction and identification of compound failure in intermediate bearing. Firstly, failure information from different frequency bands of casing vibration signals is separated and signals are denoised based on WT and SVD difference spectrum. Secondly, concerning that the larger Lempel–Ziv complexity (LZC) of signal is, the more abundant failure information in signal will be; meanwhile, so as to avoid “excessive coarse graining” caused by traditional binarization method, M-LZC values of component signals after denoising are used to describe the failure feature information included in component signals. Thirdly, to further strengthen the failure feature information of intermediate bearing, larger weight value will be endowed to the component signals containing more abundant failure feature information. Failure information is boosted by M-LZC weight coefficient of component signal. Finally, component signals of an enhanced feature are reconstructed and the spectrum of reconstructed signal is used to make precise identification of compound failure type of intermediate bearing in aircraft engine.

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“…Shi et al (2020) put forward a damage model and analyzed the mapping relationship between contact deformation and damage size. Yi et al (2021) equalized the damage on the inner raceway to the isosceles trapezoid groove and studied the vibration signal in the double rotor system with damaged bearing. Song et al (2022) proposed an algorithm to extract the bearing damage signal from the measured data and proved that the algorithm has the ability to extract the time–frequency characteristics of the damage.…”

Section: Introductionmentioning

confidence: 99%

Vibration analysis of shaft-cylindrical roller-bearing-pedestal system considering damage by Runge–Kutta algorithm

Haozhe

et al. 2023

Journal of Vibration and Control

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The raceway damage of the bearing restricts the operation stability of the system. Therefore, in the case of damage, simulating vibration response and predicting the performance of the shaft-cylindrical roller-bearing-pedestal system have high research value. According to the structural characteristics and the force transfer relationship, a dynamic model of the shaft-cylindrical roller-bearing-pedestal system is established in this paper. Then, the vibration response of the system is simulated by Runge–Kutta algorithm and measured by experiment. Finally, the effects of load and speed, damage size, and radial clearance on the dynamic performance are investigated. The simulation and measurement results indicate that the load F and the speed N can promote the enhancement of the vibration acceleration signal. As the damage length continues to increase, the ring in the Poincaré map begins to break, and the system transits from quasi-periodic to chaotic motion. The vibration signal is more affected by the damage size than by the damage location. When the radial clearance increases from 5 × 10−6 m to 15 × 10−6 m, the PTP value increases from 23.83 m·s−2 to 61.36 m·s−2.

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Nonlinear resonance characteristics of a dual-rotor system with a local defect on the inner ring of the inter-shaft bearing

Cited by 39 publications

References 11 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

A novel method to identify the multiple faults of intermediate bearing based on multiscale Lempel–Ziv complexity enhancement

Vibration analysis of shaft-cylindrical roller-bearing-pedestal system considering damage by Runge–Kutta algorithm

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