Nonlinear dynamic analysis of two-disk rotor system containing an unbalance influenced transverse crack

Kushwaha, Nirmal; Patel, V. N.

doi:10.1007/s11071-022-07893-7

Cited by 15 publications

(4 citation statements)

References 56 publications

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“…The response-dependent breathing models hold that the crack breathing state is determined by the local response of the crack, so it is applicable not only in the case of gravity dominance, but also in the case of non-gravity dominance. Response-dependent breathing models mainly include: the three-dimensional nonlinear contact model [10], which is recognized as a most accurate numerical model but with heavy computation; the analytical three-dimensional contact model [11]; the rigid finite element model [12,13]; the zero stress intensity factor model [14]; and the neutral axis model [15][16][17]. Although the first three models are relatively accurate, complex computation is demanded for simulation.…”

Section: Introductionmentioning

confidence: 99%

An Improved Crack Breathing Model and Its Application in Crack Identification for Rotors

Liu

Cao

2023

Machines

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The crack breathing model and crack identification method for rotors using nonlinearity induced by cracks are studied in this work. Firstly, the finite element method is utilized to model a rotor–bearing system with a response-dependent breathing crack to obtain the numerical data for crack identification. During the modelling, an improved breathing crack model is proposed, focused on the unreasonable assumption about crack closure line in the original crack closure line position (CCLP) model. Compared with the original model, the improved breathing model can reflect the nonlinear behavior of cracks better. Secondly, based on the established model, super-harmonic features at 1/3 and 1/2 of the critical rotating speeds under different crack locations and crack depths are extracted for crack identification. Additionally, the super-harmonic features from two measurement points are used as inputs into an artificial neural network with a Levenberg–Marquardt back-propagation algorithm, corresponding crack positions and depths as outputs. The robustness of the method is tested by examining the identification results under different levels of noise. The results show that the proposed crack identification method is efficient for simultaneous identification of crack depth and position in operating rotors.

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Section: Introductionmentioning

confidence: 99%

An Improved Crack Breathing Model and Its Application in Crack Identification for Rotors

Liu

Cao

2023

Machines

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“…Ganguly and Roy [30] have proposed an analysis of the effect of breathing crack on the vibration characteristics of the rotor shaft. Analysis of an unbalanced transverse crack on the two-disc rotor shaft system has been carried out by Kushwaha and Patel [31]. A crack closure line position (CCLP) breathing model has been proposed for crack identification using the zero stress intensity factor model [32].…”

Section: Introductionmentioning

confidence: 99%

Effect of Thermal Response and Vibration on the Multicracked Rotor Immersed in a Fluid Medium Using Finite Element Method

Yadao,

Majumder,

Barik

et al. 2023

International Journal of Energy Research

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A rotor shaft under high rotating speeds and heavy loading may establish fatigue damage in terms of cracks due to the long duration of the operation. Analysis of the size and location of the crack in the rotor shaft becomes very difficult, especially while the rotor shaft revolves in a viscous fluid medium. This research is an attempt to measure the vibration signature of a multicracked cantilever rotor shaft with additional mass at the free end in a different fluid medium at a finite region. The dynamic response of a cracked cantilever rotor shaft, with additional mass at the free end, partly immersed in air and diverse viscous mediums are measured experimentally. The existence of open cracks in the rotor shaft in both transverse directions, along the crack and perpendicular to the crack, was considered. The experimental analysis is performed to examine the variation in vibration response with varying the size of the rotor shaft, crack depth, and fluid properties. The finite element analysis technique is employed by using ANSYS to authenticate the vibration response of the same multicracked cantilever rotor shaft in air and different viscous mediums.

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“…As an alternative, physics-based methods (PBM) and even their digital twin models have been primarily developed to detect and localize unbalance and crack defects [5,6]. PBM provides credible fault detection and diagnostics by capturing and analyzing parameter or system behavior changes [7], which include finite element models (FEM) and other mechanism modeling methods allowing simulation of normal and fault state responses. However, in practice, the rotor aging and the rotor operating conditions' diversity may affect the performance of the PBM.…”

Section: Introductionmentioning

confidence: 99%

Rotor Dynamics Informed Deep Learning for Detection, Identification, and Localization of Shaft Crack and Unbalance Defects

WEIKUN¹,

Nguyen²,

Medjaher³

et al. 2023

SSRN Journal

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Nonlinear dynamic analysis of two-disk rotor system containing an unbalance influenced transverse crack

Cited by 15 publications

References 56 publications

An Improved Crack Breathing Model and Its Application in Crack Identification for Rotors

An Improved Crack Breathing Model and Its Application in Crack Identification for Rotors

Effect of Thermal Response and Vibration on the Multicracked Rotor Immersed in a Fluid Medium Using Finite Element Method

Rotor Dynamics Informed Deep Learning for Detection, Identification, and Localization of Shaft Crack and Unbalance Defects

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