Analysis of Dynamic Characteristics of Small-Scale and Low-Stiffness Ring Squeeze Film Damper-Rotor System

Shi, Mingming; Yong, Yang; Deng, Wangqun; Wang, Jianjun; Fu, Chao

doi:10.3390/app12147167

Cited by 6 publications

(3 citation statements)

References 27 publications

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“…In particular, most of the above researches have focused on the effects of seal-induced force [9,14,15] and blade-tip clearance-induced force [3,[17][18][19][20][21][22]. However, during the normal operation of aeroengines, the squeeze film damper (SFD) is widely employed to attenuate vibration of the rotor [23,24]. As a result, both nonlinear oil-film force induced by SFD and aerodynamic force may interact with each other, thus complicating the dynamic behaviors of the rotor.…”

Section: Introductionmentioning

confidence: 99%

Dynamic characteristics analysis of an aeroengine rotor system subjected to aerodynamic excitation

Shao,

Wu,

Zhang

2023

Meas. Sci. Technol.

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This paper aims to investigate the dynamic characteristics of an aeroengine rotor subjected to aerodynamic excitation. Firstly, the dynamic model of the turbo-shaft engine rotor system is established by means of finite element method, taking into account the blade-tip clearance-induced aerodynamic force and oil-film force induced by squeeze film damper (SFD). Next, the critical speeds and mode shapes of the rotor are achieved by calculation, simulation and experiment to illustrate the validity of the established model. Then, using bifurcation diagram, rotating orbit and time-domain waveform, the dynamic responses of the turbo-shaft engine high-pressure rotor with aerodynamic excitation are analyzed, and the effects of blade-tip clearance, inlet and outlet angles on the dynamic responses of the rotor are discussed, respectively. The numerical results reveal that the system maintains a stable-periodic motion at low-speed region. In contrast, at high-speed region, there is a noticeable appearance of instability. Besides, the magnitude of the response decreases with the growth of the blade-tip clearance. The growth of the inlet angle will result in an increase of the magnitude of the response, and the magnitude of the response reduces with the growth of the outlet angle. The aerodynamic force at resonance is greater than that at non-resonance. The research results can assist in understanding the dynamic characteristics of the rotor subjected to aerodynamic excitation, and provide theoretical guidance for the structural design of an aeroengine rotor system.

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Section: Introductionmentioning

confidence: 99%

Dynamic characteristics analysis of an aeroengine rotor system subjected to aerodynamic excitation

Shao,

Wu,

Zhang

2023

Meas. Sci. Technol.

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“…[14][15][16][17] Ma et al 18 studied the steady-state responses of a reduced dual-rotor system with nonlinear bearings and squeeze film damper based on rotor orbits and spectrum cascades. Shi et al 19 found that the ring squeeze film damper can regulate the rotor vibration significantly and help the rotor shaft trajectory quickly converge to a balanced state. Varney and Green 20 analyzed the influence of support asymmetry degree on the nonlinear vibration responses of rotor systems.…”

Section: Introductionmentioning

confidence: 99%

Multi-fault classification of rotor systems based on phase feature of axis trajectory in noisy environments

Hua

Xiong

et al. 2023

Structural Health Monitoring

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As it is difficult to distinguish multiple rotor faults with similar dynamic phenomena in noisy environments, a multi-fault classification method is proposed by combining the extracted trajectory phase feature, a parameter-optimized variational mode decomposition (VMD) method and a light gradient boosting machine (LightGBM) model. The trajectory phase feature is extracted from an axis trajectory by fusing the frequency, amplitude, and phase information related to rotor motion and can comprehensively describe the dynamic characteristics induced by different rotor faults. First, the vibration displacement signals in two orthogonal directions are collected to construct the axis trajectories with 12 rotor states including healthy, unbalance, misalignment, single crack, multiple cracks, and a mixture of them. Second, the trajectory phase feature is extracted from the vectorized axis trajectories, and the frequency spectra of trajectory phase angles under different rotor faults are analyzed through Fourier transform. Finally, a parameter-optimized VMD method combined with a LightGBM model is applied to classify multiple faults of rotor systems in different noisy environments based on the extracted trajectory phase feature. The 12 rotor states can be classified into nine categories based on the harmonic information of 1X–7X components (X is the rotating frequency of a rotor system) and other components with smaller amplitudes in the frequency spectra of trajectory phase angles. The average classification accuracy of the 12 rotor states exceeds 93.0%, and the recognition rate for each kind of fault is greater than 77.5% in noisy environments. The simulated and experimental results demonstrate the effectiveness and adaptability of the proposed multi-fault classification method. This work can provide a reference for the condition monitoring and fault diagnosis of rotor systems in engineering.

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“…The analysis indicates that the nonlinearity of the ERSFD oil film coefficient is lower than that of SFD. Shi et al [18] established the rotor dynamic model with a novel floating ring squeeze oil film damper (FSFD) and identified the oil film pressure distribution, fluid-structure coupling dynamic characteristics and elastic ring support stiffness of the rotor system with FSFD. The results show that the small-scale and low stiffness FSFD has a significant regulating effect on rotor vibration.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Characteristics Study of Elastic Ring Squeeze Film Damper with Rigid–Elastic–Oil Coupled Model

Li,

Yang,

Deng

2023

Lubricants

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Due to the coupling of the damper journal with the elastic ring and oil film, the elastic ring squeeze film damper (ERSFD) shows better dynamic performance in comparison with the traditional squeeze film damper (SFD). Therefore, a novel rigid–elastic–oil coupled mathematical model was established. The elastic ring deformation, as the key point, is solved according to the planar bending theory. Then, based on the pressure governing equation of the oil film, using the central finite difference method, the oil film pressure was addressed. Meanwhile, the Simpson method was implemented to calculate the dynamic characteristic coefficients (equivalent stiffness and damping Ce) of ERSFD (DCCEs). Also, we analyzed the influence of journal eccentricity, oil film radius clearance, flexibility coefficient and damping hole diameter on the DCCEs, and the results were compared and verified with the existing literature. The sensitivity of each parameter to the DCCEs was analyzed by using the linear regression method. According to the results, the flexibility coefficient has the greatest effect on the DCCEs, followed by the oil film radius clearance. The eccentricity of the journal and damping hole diameter have the least impact. This work will provide a theoretical basis for reflecting on the bearing dynamic characteristics more truly and accurately.

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Analysis of Dynamic Characteristics of Small-Scale and Low-Stiffness Ring Squeeze Film Damper-Rotor System

Cited by 6 publications

References 27 publications

Dynamic characteristics analysis of an aeroengine rotor system subjected to aerodynamic excitation

Dynamic characteristics analysis of an aeroengine rotor system subjected to aerodynamic excitation

Multi-fault classification of rotor systems based on phase feature of axis trajectory in noisy environments

Dynamic Characteristics Study of Elastic Ring Squeeze Film Damper with Rigid–Elastic–Oil Coupled Model

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