Model-based fatigue crack identification in rotors integrated with active magnetic bearings

Singh, Sandeep; Tiwari, Rajiv

doi:10.1177/1077546315587146

Cited by 28 publications

(8 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Silva and Pederiva (2013) used SVM, fuzzy logic and ANN to detect faults in rotating parts of induction motor and further stated the superiority of SVM over other processes. Singh and Tiwari (2016, 2017) considered an active magnetic bearing mounted cracked Jeffcott rotor and monitored crack using vibration signal and controller current. With all the recent discoveries in the methodologies used to detect and diagnose faults, the proof to the fact clearly delivers their importance in the field of complex systems such as rotor shaft.…”

Section: Problems In Rotor Dynamicsmentioning

confidence: 99%

A review on modelling and dynamic analysis of viscoelastic rotor systems

Ganguly

Chandraker

Roy

2022

AEAT

View full text Add to dashboard Cite

Purpose The purpose of this study is to bring down collective information about various issues encountered in modelling of rotor systems. Design/methodology/approach The most important and basic part of “rotor dynamics” is the study related to its different modelling techniques which further involves the analysis of shaft for understanding the system potential, competence and reliability. The issues addressed in this study are classified mainly into two parts: the initial part gives out a vast overview of significant problems as well as different techniques applied to encounter modelling of rotor systems, while the latter part of the study describes the post-processing problem that occurs while performing the dynamic analysis. Findings The review incorporates the most important research works that have already placed a benchmark right from the beginning as well as the recent works that are still being carried out to further produce better outcomes. The review concludes with the modal analysis of rotor shaft to show the importance of mathematical model through its dynamic behaviour. Originality/value A critical literature review on the modelling techniques of rotor shaft systems is provided from earliest to latest along with its real-time application in different research and industrial fields.

show abstract

Section: Problems In Rotor Dynamicsmentioning

confidence: 99%

A review on modelling and dynamic analysis of viscoelastic rotor systems

Ganguly

Chandraker

Roy

2022

AEAT

View full text Add to dashboard Cite

show abstract

“…Table 1 summarizes the numerical data utilized for the simulation purpose to generate responses of the system at both AMBs locations. The assumed values of unbalance eccentricity in the range of 10 −4 m have been taken from Singh and Tiwari (2015). Similarly, the values of initial radial offset, a, and manually added misalignment, ∆, between the rotor and AMB axes are assumed depending upon the condition that these values are less than AMB air gap, s 0 .…”

Section: Generation Of Numerically Simulated Responsesmentioning

confidence: 99%

“…8. The phase diagrams for both response signals have been plotted in accordance with phase correction method (Singh and Tiwari 2015) utilizing reference signal following Fig. 4.…”

Section: Quantitative Estimation Of Unbalanced and Misaligned Amb Parmentioning

confidence: 99%

Development of a Novel Approach for Quantitative Estimation of Rotor Unbalance and Misalignment in a Rotor System Levitated by Active Magnetic Bearings

Kumar

Tiwari

2020

Iran J Sci Technol Trans Mech Eng

Self Cite

View full text Add to dashboard Cite

In the present paper, a novel model-based identification algorithm is developed to estimate the unbalance and AMB misalignment in a rigid rotor system levitated with active magnetic bearings (AMBs). For this, a mathematical model for an unbalanced and misaligned rigid rotor system consisting of a rigid rotor levitated by two active magnetic bearings has been developed. Two cases of the misalignment depending upon the amount of radial offset between the rigid rotor and active magnetic bearings have been examined for the investigation. In the first case, an unknown misalignment is considered that is to be estimated. In the second case, a trial misalignment is added in addition to the unknown misalignment. This is a novel concept proposed in line with the trial unbalance in rotor dynamic balancing. The equations of motion of the rigid rotor-misaligned AMB system are derived and numerically simulated to generate the time-domain rotor displacement and controlling current responses, which are further converted into frequency-domain signals assisted by the fast Fourier transform analysis. These responses have been utilized in the identification algorithm to estimate the unbalance and force-displacement and force-current stiffnesses of misaligned AMBs as well as the misalignment amount between the rotor and AMBs. Estimations of unbalance and AMB misalignment parameters have also been carried out at multiple speeds as well as against various levels of measurement signal noise and modelling errors. The developed identification algorithm is found to be effective and robust against these noise and modelling errors.

show abstract

“…The SFD has highly nonlinear characteristics, which creates high-amplitude bi-stable and nonsynchronous responses for the rotors. The large-amplitude response can result in rotor rubs and fatigue [27]. The rotating machinery support of the aeroengine will endure a severe bad working condition when the aircraft operates at high speeds.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Dynamic Characteristics of Small-Scale and Low-Stiffness Ring Squeeze Film Damper-Rotor System

et al. 2022

View full text Add to dashboard Cite

Rotor machinery supports are susceptible to fracture arising from multi-period or irregular transient vibration and even the inconspicuous fatigue phenomenon. The novel dynamic model of a rotor mounted on the floating ring squeeze film damper (SFD) was developed. The proposed SFD implements low stiffness and small scale to overcome the deficiency. Based on the theory of hydrodynamic lubrication, the Reynolds equations on the working principle of the floating ring are established. Then, the dynamic characteristics of the rotor system during maneuvers, with the floating ring SFD supports, are subsequently examined by adopting the finite difference method. In addition, the oil film whirl mechanism of the floating ring SFD is demonstrated according to the transient analysis of the fluid–structure interaction model. The results of the SFD simulation reveal that, with increasing eccentricity ratio, both the inner and outer oil film pressure tend to be larger due to the shrinkage of the effective coverage of oil film. The maximum oil film pressure and bearing capacity increase nonlinearly within a certain eccentricity ratio range. Through the comparisons of the results, the vibration suppression effects of the proposed SFD are analyzed. This work will provide the practical reference for the dynamic design of the rotor support system.

show abstract

Model-based fatigue crack identification in rotors integrated with active magnetic bearings

Cited by 28 publications

References 22 publications

A review on modelling and dynamic analysis of viscoelastic rotor systems

A review on modelling and dynamic analysis of viscoelastic rotor systems

Development of a Novel Approach for Quantitative Estimation of Rotor Unbalance and Misalignment in a Rotor System Levitated by Active Magnetic Bearings

Analysis of Dynamic Characteristics of Small-Scale and Low-Stiffness Ring Squeeze Film Damper-Rotor System

Contact Info

Product

Resources

About