Dynamic study of viscoelastic rotor: Modal analysis of higher order model considering various asymmetries

Roy, Haraprasad; Chandraker, Saurabh

doi:10.1016/j.mechmachtheory.2016.11.003

Cited by 19 publications

(7 citation statements)

References 18 publications

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“…e frequency at the wave crest corresponding to the frequency corresponding to the fast reverse rotation (the frequency of the rotation speed within one minute) in the case 1 (case 2) Campbell diagram, as shown in Figures 22 and 23), is similar to the black (red) number in Figure 20. Because the steering mode is dominant in the response diagram, the critical speeds Ω cr1 and Ω cr2 in case 1 (case 2) 1F and 2F modes are not shown in the diagram and followed a phenomenon similar to that reported by Chouksey and Roy [29,30]. Because of the effect of temperature, the steering frequency of case 2 shifted to the left, making the change of response amplitude more obvious.…”

Section: Unbalance Response Analysismentioning

confidence: 64%

Dynamic Behaviour Analysis of Turbocharger Rotor-Shaft System in Thermal Environment Based on Finite Element Method

Liu

Wang

Cao

et al. 2020

Shock and Vibration

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The stable operation of a high-speed rotating rotor-bearing system is dependent on the internal damping of its materials. In this study, the dynamic behaviours of a rotor-shaft system with internal damping composite materials under the action of a temperature field are analysed. The temperature field will increase the tangential force generated by the internal damping of the composite material. The tangential force will also increase with the rotor speed, which can destabilise the rotor-shaft system. To better understand the dynamic behaviours of the system, we introduced a finite element calculation model of a rotor-shaft system based on a 3D high-order element (Solid186) to study the turbocharger rotor-bearing system in a temperature field. The analysis was done according to the modal damping coefficient, stability limit speed, and unbalance response. The results show that accurate prediction of internal damping energy dissipation in a temperature field is crucial for accurate prediction of rotor dynamic performance. This is an important step to understand dynamic rotor stress and rotor dynamic design.

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Section: Unbalance Response Analysismentioning

confidence: 64%

Dynamic Behaviour Analysis of Turbocharger Rotor-Shaft System in Thermal Environment Based on Finite Element Method

Liu

Wang

Cao

et al. 2020

Shock and Vibration

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“…Chouksey et al (2012) obtained dFRF of FEM of a flexible rotor sustained by short oil-film bearing after including the influences of internal rotor material damping and fluid film forces. Roy and Chandraker (2017) obtained dFRF of a viscoelastic rotor to show the significance of higher- order model over a conventional second-order model.…”

Section: Dynamic Study In Rotor Dynamicsmentioning

confidence: 99%

“…Dynamic analyses of the internally damped rotor shaft mounted on journal bearings at its two ends are explained using various modal parameters. These parameters are determined based on the higher order equation of motion of the viscoelastic rotating shaft given below (Roy and Chandraker, 2017). …”

Section: Dynamic Study In Rotor Dynamicsmentioning

confidence: 99%

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A review on modelling and dynamic analysis of viscoelastic rotor systems

Ganguly

Chandraker

Roy

2022

AEAT

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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.

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“…Stability of any linear system can be classified based on complex eigenvalues and eigenvectors, which come from solving a modal analysis problem [16][17][18][19] . This approach allows to consider a detailed modelling of the investigated rotor system unlike the stability analysis obtained by e.g.…”

Section: Modal Analysis and Stability Analysismentioning

confidence: 99%

Predictive capability of various linearization approaches for floating-ring bearings in nonlinear dynamics of turbochargers

Dyk

Smolík

Rendl

2020

Mechanism and Machine Theory

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A floating-ring bearing (FRB) is composed of a journal, a floating ring and a housing which are separated by two thin oil films. This system is inherently nonlinear and if it is lightly loaded or operated at high speeds, it is prone to the fluid-induced instability. The threshold speed for the instability of a journal bearing with one oil film can be estimated using linearized forces acting in the film. However, the linear analysis of FRB might be problematic because results of such an analysis are usually difficult to interpret. Nevertheless, the linear analysis can provide some fundamental insights into system behaviour. This work aims to evaluate in detail the use of linear theory in the stability analysis of rotating systems supported on FRBs. Several approaches for the linearization of the forces acting in FRB are proposed and analysed. The results are visualized in the form of a holistic Campbell diagram which together depicts natural frequencies, whirl frequencies, modal damping and precession of mode shapes. Moreover, it is demonstrated that the holistic Campbell diagram can be used to interpret-and to some extent, also to predict-results of nonlinear analysis.

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Dynamic study of viscoelastic rotor: Modal analysis of higher order model considering various asymmetries

Cited by 19 publications

References 18 publications

Dynamic Behaviour Analysis of Turbocharger Rotor-Shaft System in Thermal Environment Based on Finite Element Method

Dynamic Behaviour Analysis of Turbocharger Rotor-Shaft System in Thermal Environment Based on Finite Element Method

A review on modelling and dynamic analysis of viscoelastic rotor systems

Predictive capability of various linearization approaches for floating-ring bearings in nonlinear dynamics of turbochargers

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