Simulation of casing vibration resulting from blade–casing rubbing and its verifications

Chen, G.

doi:10.1016/j.jsv.2015.09.041

Cited by 58 publications

(24 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Jacquet-Richardet et al [13] gave a review of these models and results which synthesize blade tiprub interaction and rotor-to-stator contacts. Chen [14] evaluated the blade-casing rubbing fault by studying the effects of the number of blades on the casing signal's characteristics. The results can be used to detect faults when blade contacts occur in rotating machines.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear vibrations of a misaligned bladed Jeffcott rotor

Thiery

Aidanpää

2016

Nonlinear Dyn

View full text Add to dashboard Cite

This paper describes the numerical and experimental investigation of the nonlinear vibration of a bladed Jeffcott rotor. The nonlinearity in the system is due to discontinuities caused by multiple contacts with an outer ring as well as the nonlinear deformation of the massless blades. Contacts occur since the rotor shaft is initially misaligned by displacing the outer ring in one direction. The aim of the paper is to develop a simple model of bladed rotor and verify whether the global dynamics of the numerical simulations can be observed experimentally. The experimental rig and data acquisition are presented in detail together with the experimental procedures. The results between the numerical simulation and experiments are compared in terms of bifurcation diagrams and waterfall plots. An overall correlation is observed between the numerical and experimental study in the case of stiff blades, with differences mainly in localized frequency ranges due to parameter variation.

show abstract

Section: Introductionmentioning

confidence: 99%

Nonlinear vibrations of a misaligned bladed Jeffcott rotor

Thiery

Aidanpää

2016

Nonlinear Dyn

View full text Add to dashboard Cite

show abstract

“…The most remarkable dimensions and mechanical properties of the model are shown in Table 1. These values of Table 1 are within the range of those appearing in some reduced scale experimental devices typically employed in the literature for model validation [6,12]. The model simulation requires the dynamical system of ordinary differencial equations-SODE-shown in 1.…”

Section: Rotor-casing Modelmentioning

confidence: 57%

“…These impacts have an amplitude-modulated component with frequency equal to rotation speed. Chen [6] contrasts those experimental results with a simulation in a rotor model described in [7]: the shaft is discretized into beam elements, the disk blades are solid-undeformabl-straight beams and the casing is modeled as a two-dimensional curved non-rotating beam with two displacements on the radial plane per node. Wang [8] another experimental rig is used to reproduce the same type of rub than in the previous papers: rub is inflicted by means of a nylon block on the casing that impacts with a number of disc blades as the shaft rotates.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the ContinuousWavelet Transform for Detection of Single-Point Rub in Aeroderivative Gas Turbines with Accelerometers

Silva¹,

Zarzo²,

Muñoz-Guijosa³

et al. 2018

Preprint

View full text Add to dashboard Cite

A common fault in turbomachinery is rotor-casing rub. Shaft vibration, measured with proximity probes, is the most powerful indicator of rotor-stator rub. However, in machines such as aeroderivative turbines, with increasing industrial relevance in power generation, constructive reasons prevent the use of those sensors, being only acceleration signals at selected casing locations available. This implies several shortcomings in the characterization of the machinery condition, associated with a lower information content about the machine dynamics. In this work we evaluate the performance of the Continuous Wavelet Transform to isolate the accelerometer signal features that characterize rotor-casing rub in an aeroderivative turbine. The evaluation is carried out on a novel rotor model of a rotor-flexible casing system. Due to damped transients and other short-lived features that rub induces in the signals, the Continuous Wavelet Transform proves being more effective than both Fourier and Cepstrum Analysis. This creates the chance for enabling early fault diagnosis of rub before it may cause machine shutdown or damage.

show abstract

“…In this paper, the vibration signals collected from the sensors on the casing are used to realize the fault diagnosis. Applying casing signals to diagnosis is a work more challenging than using bearing signals due to the complexity of signal components and the strong noise interference [19].…”

Section: Experimental System and Datamentioning

confidence: 99%

“…Further feature extraction is based on VMD outputs [19,20]. Here in Figure 8 are time waveforms, frequency spectrums, and envelope spectrums of IMFs from one signal sample.…”

Section: Vibrational Feature Extraction Of Experimental Datamentioning

confidence: 99%

Casing Vibration Fault Diagnosis Based on Variational Mode Decomposition, Local Linear Embedding, and Support Vector Machine

Yang

Jiang

2017

Shock and Vibration

View full text Add to dashboard Cite

To diagnose mechanical faults of rotor-bearing-casing system by analyzing its casing vibration signal, this paper proposes a training procedure of a fault classifier based on variational mode decomposition (VMD), local linear embedding (LLE), and support vector machine (SVM). VMD is used first to decompose the casing signal into several modes, which are subsignals usually modulated by fault frequencies. Vibrational features are extracted from both VMD subsignals and the original one. LLE is employed here to reduce the dimensionality of these extracted features and make the samples more separable. Then low-dimensional data sets are used to train the multiclass SVM whose accuracy is tested by classifying the test samples. When the parameters of LLE and SVM are well optimized, this proposed method performs well on experimental data, showing its capacity of diagnosing casing vibration faults.

show abstract

Simulation of casing vibration resulting from blade–casing rubbing and its verifications

Cited by 58 publications

References 13 publications

Nonlinear vibrations of a misaligned bladed Jeffcott rotor

Nonlinear vibrations of a misaligned bladed Jeffcott rotor

Evaluation of the ContinuousWavelet Transform for Detection of Single-Point Rub in Aeroderivative Gas Turbines with Accelerometers

Casing Vibration Fault Diagnosis Based on Variational Mode Decomposition, Local Linear Embedding, and Support Vector Machine

Contact Info

Product

Resources

About