Crack identification in rotating shafts by coupled response measurements

Gounaris, G.D.; Papadopoulos, Chris

doi:10.1016/s0013-7944(01)00076-5

Cited by 58 publications

(32 citation statements)

References 14 publications

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“…During the past several decades, significant amount of research has been conducted in the area of crack detection in systems using only theoretical modelling method [4][5][6][7][8][9][10][11], combined both theoretical and experimental methods [12][13][14] or only experimental method [15]. The main idea of these approaches is that a change in a rotor system due to damage crack will manifest itself as changes in the rotor dynamic behaviour: first of all, the presence of a transverse crack induces a slight decrease of the natural frequencies [16,2,10].…”

Section: Introductionmentioning

confidence: 99%

Detection of cracks in rotor based on the 2× and 3× super-harmonic frequency components and the crack–unbalance interactions

Sinou

2008

Communications in Nonlinear Science and Numerical Simulation

103

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The purpose of this paper is to investigate the use of the 2· and 3· super-harmonic frequency components for detecting the presence of a single transverse breathing crack in a non-linear rotor system. This procedure is based on the detection of the super-harmonic frequency components of the non-linear dynamical behaviour at the associated sub-critical resonant peaks.The non-linear behaviour of the rotor system with a breathing crack is briefly analysed numerically: it will be illustrated that the effects of the crack size and location induce the variation of non-linear responses and the emerging of new resonance -antiresonance peaks of the cracked rotor at second, third and fourth harmonic frequency components. Then, the influence of the crack-unbalance interactions and more particularly the relative orientation between the front crack and the unbalance are also undertaken with considerations of various crack depths, and unbalance magnitudes. It is demonstrated that for a given crack depth, the unbalance does not only affect the vibration amplitude of the 1· amplitudes, but also the 1 2 and 1 3 sub-critical resonant peaks. Finally, it is illustrated that the emerging of super-harmonic frequency components provides useful information on the presence of cracks and may be used on an on-line crack monitoring rotor system. Using this methodology, the detection of small levels of damage may be easily undertaken.

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Section: Introductionmentioning

confidence: 99%

Detection of cracks in rotor based on the 2× and 3× super-harmonic frequency components and the crack–unbalance interactions

Sinou

2008

Communications in Nonlinear Science and Numerical Simulation

103

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“…Gounaris and Papadopoulos [132] used the property of coupled vibrations introduced by a crack in order to identify a crack in a rotating cracked shaft. The shaft was modeled as a rotating Timoshenko beam, including the gyroscopic effect and the axial vibration due to coupling.…”

Section: Coupling-based Identificationmentioning

confidence: 99%

The strain energy release approach for modeling cracks in rotors: A state of the art review

Papadopoulos

2008

Mechanical Systems and Signal Processing

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156

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“…Natural frequencies and mode shapes estimated from test and simulation have been compared. Many scientific papers indicate the existence of a strong sensitivity of a structure's modal model to a discontinuity of the structure caused by a crack [2,5,7]. Object of the investigation is a square hollow steel section.…”

Section: Fig 1 Dimensions Of the Investigated Beammentioning

confidence: 99%

The Experimental Verification of the Numerical Model for Cracked Beam Incorporating Measurement Uncertainty

Żywica¹,

Łuczak²

2008

Advances in Materials Sciences

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This paper presents verification of the numerical model of a cracked beam against the experimental results. Presented investigation assesses the adequacy of a crack model incorporated in the ABAQUS commercial FEM package. Structure under investigation is a square hollow steel section. Experimental and numerical modal model parameters like mode shapes and natural frequencies were compared. Obtained results confirm the high level of confidence for the numerical model of the crack. This observation constitutes application of crack model in the computations of more complex structures.

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Crack identification in rotating shafts by coupled response measurements

Cited by 58 publications

References 14 publications

Detection of cracks in rotor based on the 2× and 3× super-harmonic frequency components and the crack–unbalance interactions

Detection of cracks in rotor based on the 2× and 3× super-harmonic frequency components and the crack–unbalance interactions

The strain energy release approach for modeling cracks in rotors: A state of the art review

The Experimental Verification of the Numerical Model for Cracked Beam Incorporating Measurement Uncertainty

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