Response Characteristics of Looseness‐Rubbing Coupling Fault in Rotor‐Sliding Bearing System

Liu, Yang; Xue, Zengyuan; Jia, Lei; Shi, Tiezhu; Ma, Hui

doi:10.1155/2017/8742468

Cited by 16 publications

(8 citation statements)

References 18 publications

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“…Scholars have made substantial research on the fault diagnosis of rotating machinery, such as bearings. Numerous model-based methods [3,4], signal-based methods [5,6], and data driven methods [7,8] have been proposed. Te model-based methods establish precise mathematical models of bearings and compare the output values with actual values to identify faults.…”

Section: Introductionmentioning

confidence: 99%

Fault Diagnosis Method for Bearing Based on Digital Twin

Xie

Yang

et al. 2022

Mathematical Problems in Engineering

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The bearing is an essential component of rotating machinery, as its reliability and running state have a direct impact on the machinery’s performance. Considering that deep learning-based fault diagnosis methods for bearing require a large amount of labelled sample data, a novel fault diagnosis framework based on digital twin is proposed. In the case of fault data available, self-organizing maps with minimum quantization error and support vector machine are employed to analyze the data. Where fault data is unavailable, a bearing digital twin model is first constructed to simulate the data, and the convolutional neural network combined with transfer learning is utilized to diagnose the bearing faults. Then, the law of bearing performance degradation is investigated. The effectiveness of the proposed method is verified using bearing vibration data.

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Section: Introductionmentioning

confidence: 99%

Fault Diagnosis Method for Bearing Based on Digital Twin

Xie

Yang

et al. 2022

Mathematical Problems in Engineering

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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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“…In Ref. [6][7][8][9], the corresponding model was proposed, and the dynamic characteristics of the proposed model were analyzed. Liu [10] proposed a dynamic model of looseness-rubbing coupling fault in the rotor-bearing system with dual-disk and threesupport.…”

Section: Introductionmentioning

confidence: 99%

Vibration Characteristics of Rotor System with Loose Disc Caused by the Insufficient Interference Force

Qiao²,

Lu³

et al. 2022

Chin. J. Mech. Eng.

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The rotating parts looseness is one of the common failures in rotating machinery. The current researches of looseness fault mainly focus on non-rotating components. However, the looseness fault of disc-shaft system, which is the main work part in the rotor system, is almost ignored. Here, a dynamic model of the rotor system with loose disc caused by the insufficient interference force is proposed based on the contact model of disc-shaft system with the microscopic surface topography, the vibration characteristics of the system are analyzed and discussed by the number simulation, and verified by the experiment. The results show that the speed of the shaft, the contact stiffness, the clearance between the disc and shaft, the damping of the disc and the rotational damping have an influence on the rotation state of the disc. When the rotation speed of the disc and the shaft are same, the collision frequency is mainly composed of one frequency multiplication component and very weak high frequency multiplication components. When the rotation speed of the disc and the shaft is close, the vibration of the disc occurs a beat vibration phenomenon in the horizontal direction. Simultaneously, a periodical similar beat vibration phenomenon also occurs in the waveform of the disc-shaft displacement difference. The collision frequency is mainly composed of a low frequency and a weak high frequency component. When the rotation speed of the disc and the shaft has great difference, the collision frequency is mainly composed of one frequency multiplication, a few weak high frequency multiplication components and a few low frequency multiplication component. With the reduction of the relative speed of the disc, the trajectory of the disc changes from circle-shape to inner eight-shape, and then to circle-shape. In the inner eight-shape, the inner ring first gradually becomes smaller and then gradually becomes larger, and the outer ring is still getting smaller. The obtained research results in this paper has important theoretical value for the diagnosis of the rotor system with the loose disc.

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Response Characteristics of Looseness‐Rubbing Coupling Fault in Rotor‐Sliding Bearing System

Cited by 16 publications

References 18 publications

Fault Diagnosis Method for Bearing Based on Digital Twin

Fault Diagnosis Method for Bearing Based on Digital Twin

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

Vibration Characteristics of Rotor System with Loose Disc Caused by the Insufficient Interference Force

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