Dynamic Characteristics Analysis of a Seal-Rotor System With Rub-Impact Fault

Luo, Yun; Wang, Pengfei; Jia, Haifeng; Huang, Fengchao

doi:10.1115/1.4051185

Cited by 11 publications

(5 citation statements)

References 33 publications

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“…According to Ref. [49], the mass matrix Msq, stiffness matrix Ksq and gyro matrix Jsq of the q-th shaft element can be further determined. The mass matrix Ms, stiffness matrix Ks and gyro matrix Js of the rotating shaft can be obtained through the assembly of elements.…”

Section: Finite Element Model Of Rotor Systemmentioning

confidence: 99%

“…The mass matrix Ms, stiffness matrix Ks and gyro matrix Js of the rotating shaft can be obtained through the assembly of elements. The damping matrix Cs of the rotor system is determined in the form of proportional damping [49]. In addition, gyro matrix Ddp and mass matrix Mdp of the disc element at the p-th node can be written as follows:…”

Section: Finite Element Model Of Rotor Systemmentioning

confidence: 99%

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Dynamic characteristics of ball bearing-coupling-rotor system with angular misalignment fault

Wang

Yang

et al. 2022

Nonlinear Dyn

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The rotor misalignment fault, which occurs only second to unbalance, easily occurs in the practical rotating machinery system. Rotor misalignment can be further divided into coupling misalignment and bearing misalignment. However, most of the existing references only analyze the effect of coupling misalignment on the dynamic characteristics of the rotor system, and ignore the change of bearing excitation caused by misalignment.Based on the above limitations, a five degrees of freedom nonlinear restoring force mathematical model is proposed, considering misalignment of bearing rings and clearance of cage pockets. The finite element model of the rotor is established based on the Timoshenko beam element theory. The coupling misalignment excitation force and rotor unbalance force are introduced. Finally, the dynamic model of the ball bearing-coupling-rotor system is established. The radial and axial vibration responses of the system under misalignment fault are analyzed by simulation. The results show that the bearing misalignment significantly influences the dynamic characteristics of the system in the low-speed range, so bearing misalignment should not be ignored in modeling.With the increase of rotating speed, rotor unbalance and coupling misalignment have a greater impact.Misalignment causes periodic changes in bearing contact angle, radial clearance, and ball rotational speed. It also leads to reciprocating impact and collision between the ball and cage. In addition, misalignment increases the critical speed and the axial vibration of the system. The results can provide a basis for health monitoring and misalignment fault diagnosis of the rolling bearing-rotor system.

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Section: Finite Element Model Of Rotor Systemmentioning

confidence: 99%

Section: Finite Element Model Of Rotor Systemmentioning

confidence: 99%

Dynamic characteristics of ball bearing-coupling-rotor system with angular misalignment fault

Wang

Yang

et al. 2022

Nonlinear Dyn

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“…Lin et al [13] revealed the nonlinear dynamic behaviors of rotor-bearing-seal system with pedestal looseness fault. Besides, Yang et al [14] and Luo et al [15] also utilized a similar Muszynska's nonlinear aerodynamic force model to discuss the dynamic behaviors of rotor system.…”

Section: Introductionmentioning

confidence: 99%

“…Overall, the aforementioned researches indicate that aerodynamic excitation has a significant impact on dynamic behaviors of the rotor. 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].…”

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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“…Furthermore, the results of the CFD simulation can be used not only to analyze the dynamic behavior of the seal, but also show good correlation with experimental data [17,18]. Luo [19] used numerical and experimental methods to exhibit the dynamic characteristics of a seal-rotor system with rub-impact fault.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Analysis of Rotor-Bearing-Seal System with Varying Parameters Muszynska Model Based on CFD and RBF

Wang

Cao

et al. 2022

Machines

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The computational fluid dynamics (CFD) combined with radial basis function (RBF) method were adopted to obtain the response surface of the Muszynska nonlinear seal force model coefficient with two variables: eccentricity and rotation speed. During the implementation of the simulation, three coefficients of the seal force model were calculated in each sub-step according to the current state of the rotor-bearing seal system; following which the rotor dynamics analysis with varying parameters was realized. As with the traditional constant coefficient method, the first-order critical speed of the system was obtained, and the bifurcation point and oil film whirl of the system response were identified. The difference is that the coefficients of the traditional method ordinarily do not change with the state of the system. Comparing the results of the varying parameter method with those of the traditional method, it can be seen that the speeds of the system corresponding to the bifurcation and oil film whirl are different. The varying parameter rotor dynamics simulation method proposed in this paper provides a new way of analyzing the nonlinear characteristics of rotor-bearing-seal systems.

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Dynamic Characteristics Analysis of a Seal-Rotor System With Rub-Impact Fault

Cited by 11 publications

References 33 publications

Dynamic characteristics of ball bearing-coupling-rotor system with angular misalignment fault

Dynamic characteristics of ball bearing-coupling-rotor system with angular misalignment fault

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

Nonlinear Analysis of Rotor-Bearing-Seal System with Varying Parameters Muszynska Model Based on CFD and RBF

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