A Survey Of The Dynamic Behaviour Of A Simple Rotating Shaft With A Transverse Crack

Gasch, Robert

doi:10.1006/jsvi.1993.1026

Cited by 355 publications

(222 citation statements)

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“…The change in this parameter during one revolution can be interpreted as the well known crack steering function, reported in [5,6,14], and others. Fig.…”

Section: Results For the 25 Percent Cracked Rotormentioning

confidence: 64%

“…Gasch [14] modified this approach, demanding that the switching takes place not at a particular angular position, but only when there is a change in the sign of rotor deflection in the direction perpendicular to the crack edge. His modification, which is often referred to as the hinge model, extends possible applications to other rotors, not only to the weight-dominant ones.…”

Section: Introductionmentioning

confidence: 99%

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Rigid finite element model of a cracked rotor

Kulesza

Sawicki

2012

Journal of Sound and Vibration

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“…The change in this parameter during one revolution can be interpreted as the well known crack steering function, reported in [5,6,14], and others. Fig.…”

Section: Results For the 25 Percent Cracked Rotormentioning

confidence: 64%

Section: Introductionmentioning

confidence: 99%

Rigid finite element model of a cracked rotor

Kulesza

Sawicki

2012

Journal of Sound and Vibration

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“…However, the crack propagation is a long time process. Gasch, a famous crack researcher, has pointed out that rotor crack faults are difficult to diagnose by short time steady-state operation data, the longtime monitoring of the rotor's dynamic response is a reliable method for on-line diagnosis of rotor crack faults [8]. However, it is difficult to analyze the crack propagation from the whole time dimension because of the large amount of data processing in the long term monitoring of the structure.…”

Section: Damage Identification Based On Pseudo-successive Datamentioning

confidence: 99%

The operation modal analysis of the structure crack fault diagnosis based on pseudo-successive data

Chen¹,

Jin²,

Sheng³

et al. 2017

Vib. proced.

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Abstract. In order to monitor the crack propagation of the structure in the working state for a long time, an operation modal analysis method based on pseudo-successive data is proposed. The vibration response signals of the cantilever beam under white noise excitation are collected and the modal parameters are extracted by the time-frequency operation modal analysis method based on the complex Morlet wavelet. In comparison with the experimental modal analysis results of hammering method, it is revealed that the error of the time-frequency operation modal analysis method is less than 10 %. By setting cracks of different lengths on the cantilever beam, the vibration response signals are extracted, and the modal parameters are extracted by the operation modal analysis method separately. By comparing those modal parameters above, it is found that the natural frequencies of the second, the fourth and the sixth orders decrease with the increase of the crack depth, and the changes of natural frequencies show the monotonicity. So, it can be used as an index for quantitative identification of crack damage. The pseudo continuous data monitoring signals of crack propagation can be constructed by means of "first discrete, then continuous". The modal parameters changes of the whole crack propagation can be observed in one time plane by means of the operation modal analysis method. Therefore, the effective monitoring and diagnosis of the structure can be completed in case of excessive data of long-time vibration monitoring signals.

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“…Often, these machines have to work over the extended periods of time in various temperature regimes under large variable loading. As a consequence, the components of the machine are exposed to potential damage, such as for example transverse crack [1,2]. For reliable and safe operation of such machines their rotors should be systematically monitored for presence of cracks and tested using non-destructive tests or vibration based techniques [21].…”

Section: Introductionmentioning

confidence: 99%

Intermittent behaviour of a cracked rotor in the resonance region

Litak

Sawicki

2009

Chaos, Solitons & Fractals

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Vibrations of the Jeffcott rotor are modelled by a three degree of freedom system including coupling between lateral and torsional modes. The crack in a rotating shaft of the rotor is introduced via time dependent stiffness with off diagonal couplings. Applying the external torque to the system allows to observe the effect of crack "breathing" and gain insight into the system. It is manifested in the complex dynamic behaviour of the rotor in the region of internal resonance, showing a quasi-periodic motion or even non-periodic behaviour. In the present paper report, we show the system response to the external torque excitation using nonlinear analysis tools such as bifurcation diagram, phase portraits, Poincaré maps and wavelet power spectrum. In the region of resonance we study intermittent motions based on laminar phases interrupted by a series nonlinear beats.

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A Survey Of The Dynamic Behaviour Of A Simple Rotating Shaft With A Transverse Crack

Cited by 355 publications

References 0 publications

Rigid finite element model of a cracked rotor

Rigid finite element model of a cracked rotor

The operation modal analysis of the structure crack fault diagnosis based on pseudo-successive data

Intermittent behaviour of a cracked rotor in the resonance region

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