Effect of partial rotor-to-stator rub on shaft vibration

Abuzaid, Mohamed. A.; Eleshaky, Mohamed E.; Zedan, Mohamed

doi:10.1007/s12206-008-0717-x

Cited by 25 publications

(6 citation statements)

References 8 publications

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“…Partial rubbing between the rotor and stator are also extensively investigated in the literatures [8][9][10][11][12][13][14][15][16][17]. Beatty [8] analyzed the rotor response due to the radial rubbing, which is described as a function of the rotor contact circumference based on a combination of analytical and experimental results.…”

Section: Introductionmentioning

confidence: 99%

“…Based on a numerical model and an experimental set-up, Torkhani et al [9] investigated the partial rub of a rotor when the rotor contacts the non-rotating obstacle under partial light, medium and severe rubs conditions. Abuzaid et al [10] analyzed the vibration responses of a partial rotor-to-stator rubbing both experimentally and analytically. Their results indicate that vibrations induced by light rubbing are characterized by the integral multiple rotational frequency and severe rubbing by 1/3 and 2/3 multiple rotational frequency.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic characteristics analysis of a rotor–stator system under different rubbing forms

Zhao

et al. 2015

Applied Mathematical Modelling

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Dynamic characteristics of a rotor rubbing with circular stator and four pin shape stators are studied based on contact dynamics theory. Based on finite element (FE) method, the rotor system attached with two disks and pin shape stators are simulated by Timoshenko beam. The circular stator is simulated by a lumped mass model, and the rotor and stator are connected by one or more point-point contact elements to establish the dynamic model of the rotor-stator coupling system. Assuming that the rubbing is caused by the sudden impact excitation and sudden unbalance excitation under two loading conditions (condition 1: in-phase unbalances of two disks at the first critical speed, condition 2: out-of-phase unbalances of two disks at the second critical speed), the system dynamic characteristics are analyzed by the time-domain waveform, rotor orbit, normal contact/rubbing force and stator acceleration. The results show that the rubbing caused by the sudden impact under the loading condition 2 will always exist and the rubbing will excite quasi-periodic motion of the rotor system; combination frequency components about the rotating frequency (1×) and the first lateral natural frequency of the rotor-stator coupling system (f n1 ) can be viewed as the most distinguishable characteristic. Full annular rubbing may appear due to the sudden unbalance excitation under the loading condition 1, the four-point rubbing can restrain the subsynchronous vibration and mainly excites odd multiple frequency components, such as 3×, 5×, etc.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dynamic characteristics analysis of a rotor–stator system under different rubbing forms

Zhao

et al. 2015

Applied Mathematical Modelling

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“…A common problem that faces industrial machinery is the rubbing phenomenon, and occurs because of the contact between the rotor and the stator of a rotational mechanical system. This phenomenon produces a distorted vibration signal and stiffening effects that increase the resonance frequency of the system [2].…”

Section: Introductionmentioning

confidence: 99%

Experimental Wavelet Analysis of Rotor-Rub Vibration Signal

Rubio*¹,

Cervantes-Herrera²,

Olivares³

2019

IJITEE

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A common defective phenomenon in rotating machinery is rotor-casing rub that generates impacts when the rotor rubs against the stator. Vibration sensors and data analysis techniques are commonly used for fault signature extraction and mechanical systems diagnosis. In this paper, an experimental characterization of rotor-rub is made by time-frequency analysis by means of the wavelet transform. A rotor kit, equipped with a variable speed DC motor, an accelerometer and a data acquisition system are used to acquire the mechanical vibration data. Vibration signal in frequency and time-frequency domains are shown for no-rubbing, light, and severe rubbing cases. Results show that FFT is unable to report where in time particular components of rubbing appear. However, the time-frequency analysis is able to give location information in time to differentiate light from severe rubbing, and extract the main spectral components showing a spectrum rich in high frequency components, characteristic of this phenomenon.

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“…In several papers [1][2][3][4][5][6][7][8], the theoretical simulations have been demonstrated about the pure vibrational aspect of a rotor system with rub-impact for the different models. Applying with rubs, Goldman and Muszynska [3] used it to examine the dynamic behavior of the rotor-stator system.…”

Section: Introductionmentioning

confidence: 99%

“…Appearance of the sub-synchronous frequencies in these transforms was suggested for early rub detection. Abuzaid et al [7] investigated the effect of partial rotor to stator rub using both analytical and experimental methods. Light rubbing induced vibrations were shown to be characterized by harmonics at frequencies equal to 1x, 2x and 3x revolutions.…”

Section: Introductionmentioning

confidence: 99%

Identification for Bifurcation and Responses of Rub-impacting Rotor System

Jeng

Hsu

Hun

et al. 2014

Procedia Engineering

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The aim of this study is to investigate the dynamic responses of a rub-impacting rotor system. A response integration method is applied to analyze bifurcation and chaotic responses for the rub-impacting rotor system. This integration method numerically integrates the distance between state trajectory and the origin in the phase plane during a specific period. It provides a quantitative characterization of system responses and can replace the role of the traditional stroboscopic technique (Poincaré section method) to observe bifurcations and chaos of the rotor system with rub-impact. According to the result comparisons from the rub-impacting rotor system, it is inferred that during Poincaré section method being applied to be analyzed the system response periods, the sampling points on Poincaré section might be too close to cause disturbances to analyze if the system response is a high-order sub-harmonic vibration. Thus, the misjudgments for system response periods will be made. The simulation results, however, show that the high-order subharmonic and chaotic responses and their bifurcations can be observed effectively.

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Effect of partial rotor-to-stator rub on shaft vibration

Cited by 25 publications

References 8 publications

Dynamic characteristics analysis of a rotor–stator system under different rubbing forms

Dynamic characteristics analysis of a rotor–stator system under different rubbing forms

Experimental Wavelet Analysis of Rotor-Rub Vibration Signal

Identification for Bifurcation and Responses of Rub-impacting Rotor System

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