Study on Coupling Fault Dynamics of Sliding Bearing-Rotor System

Liu, Yang; Xin, Xicheng; Zhao, Yulai; Ming, Shuaishuai; Ma, Yaxin; Han, Jiyuan

doi:10.1115/1.4042688

Cited by 11 publications

(8 citation statements)

References 20 publications

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“…Meanwhile, the supporting substructure and the rotor substructure are connected by the displacement and the interaction force of the bearing inner race and bearing outer race. Then, based on the theory of Hertz contact [32,33], the bearing force can be expressed as:…”

Section: Motion Equations Of the Er-rotor Systemmentioning

confidence: 99%

Dynamic analysis of the variable stiffness support rotor system with elastic rings

Sun

Zhang

et al. 2022

Nonlinear Dyn

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Elastic rings are common rotor supporting structure, which have been widely used in aeroengine rotorsupport system. However, large inertia force and gyroscopic moment may occur during the operation of aeroengine, which may lead to contact between elastic ring and bearing pedestal, and then introduce variable stiffness into the rotor-support system. In this paper, a mathematical model of variable stiffness of elastic ring is proposed and this model is subsequently verified by comparison with simulation analysis and experimental results. Based on this model, a variable stiffness model of an elastic ringsupported rotor is developed by coupling the kinetic equations of the rotor with the deformation of the combined support. Then, the spectrum cascades are used to analyze the dynamic characteristics of the rotor system. In addition, the influences of the variable stiffness of elastic ring on the critical speed of the system are also examined. Finally, some simulation results are verified by experiments on a combined test bench of an elastic ring-supported rotor.

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Section: Motion Equations Of the Er-rotor Systemmentioning

confidence: 99%

Dynamic analysis of the variable stiffness support rotor system with elastic rings

Sun

Zhang

et al. 2022

Nonlinear Dyn

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“…Especially for the dynamic characteristics of bearing such as stiffness and damping, the test is an effective way to accurately obtain the performance parameters. 7,8 The experimental data can be used to verify the theoretical calculation results and provide data support for the correction and improvement of the theoretical model. 9,10 There are many test methods to identify the dynamic characteristics of bearings.…”

Section: Introductionmentioning

confidence: 99%

Identification method of dynamic characteristics coefficients of tilting pad bearing in critical speed range of large unit

Chen

Wang

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part J:

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For tilting pad bearing of large unit, it is not easy to identify stiffness and damping coefficients in full-size unit test. Because of many limiting factors in large unit test, the stiffness and damping test methods are not fully applicable to large units, which can be easily implemented in laboratory. The nonexcitation methods are proposed in this paper to identify the stiffness and damping coefficients of tilting pad bearing in the critical speed range of large unit, including direct method and iterative method. Firstly, the rotor speed and vibration during the whole period are obtained. The vibration data of the first-order critical speed range in the startup stage are selected, and the stiffness and damping coefficients of tilting pad bearing are identified through the two methods. The results show that the stiffness and damping coefficients identified through the direct method are generally less than the theoretical values. The identification error of stiffness coefficient is within ±9%, and the identification accuracy of stiffness coefficient is significantly higher than that of damping coefficient. The damping coefficient identified by the iterative method agrees well with the theoretical value, and the identification error is about −3%. In conclusion, the stiffness and damping coefficients of tilting pad bearing in the range of first-order critical speed can be obtained by combining the two identification methods. These identification results are relatively reliable and can basically meet the analysis requirements of important vibration problems of bearing-rotor system.

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“…Research on fault coupling comes more from the coupling between faults in rotor system, such as misalignment, rubbing, unbalance, loose [1][2][3][4][5] and so on. The common method is to study the dynamic behavior, frequency response and dynamic change path of the system from the perspective of fault mechanism, based on time domain diagram, wavelet basis function, axis orbit diagram, bifurcation diagram, Poincaré section diagram, nonlinear output frequency response function (NOFRF) and other methods.…”

Section: Introductionmentioning

confidence: 99%

Analysis of fault coupling vibration and transmission characteristics of multistage gear transmission system

H¹,

Wang²,

Wang³

et al. 2022

J. vibroeng.

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In multi-stage gear transmission system, the accident is often not caused by a single fault, but by coupling fault. The decoupling and identification of coupling faults has always been a hot topic. Through the analysis of frequency characteristics and transmission characteristics, this paper explored the correlation of coupling faults in multistage gear transmission system, and analyzed the coupling mechanism of faults. According to the fault test-bed, a 3D model was built to analyze the contact force and vibration characteristics of gears at all stages. STFT and waterfall diagram were used to analyze the coupling correlation characteristics of experimental signals under two single faults and coupling faults: fixed-axis gear crack and planetary gear wear. The contact force transfer function of all stages of gears to the box was built by using the system identification theory. The source of the fault characteristic frequency component was found through the transfer function, and the transmission characteristic of the fault was revealed. It can be seen from the results that the fault coupling is not the superposition of frequency characteristics. In the coupled signal, the frequency characteristic with the largest amplitude increase is not the fault gear itself, but the intermediate gear connected with them and affected by them. This phenomenon is often misled and misjudged in the analysis.

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Study on Coupling Fault Dynamics of Sliding Bearing-Rotor System

Cited by 11 publications

References 20 publications

Dynamic analysis of the variable stiffness support rotor system with elastic rings

Dynamic analysis of the variable stiffness support rotor system with elastic rings

Identification method of dynamic characteristics coefficients of tilting pad bearing in critical speed range of large unit

Analysis of fault coupling vibration and transmission characteristics of multistage gear transmission system

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