Modelling of magnetorheological squeeze film dampers for vibration suppression of rigid rotors

Zapoměl, Jaroslav; Ferfecki, Petr; Kozánek, Jan

doi:10.1016/j.ijmecsci.2016.11.009

Cited by 53 publications

(17 citation statements)

References 23 publications

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“…Zc is the point in the Z-direction at which the core begins to fill the entire clearance of MRD. Based on the bilinear constitutive law, a general mathematical model of MRD was proposed by Zapoměl et al [22][23][24]. Using their method, the implicit Reynolds equation of MRD can be given as: Based on the bilinear constitutive law, a general mathematical model of MRD was proposed by Zapoměl et al [22][23][24].…”

Section: Theory and Model Of Mrdmentioning

confidence: 99%

“…Considering the thermal effect, Ghaednia [21] established a dynamic model of MRD based on Bingham constitutive law and analyzed the influence of temperature and current on the steady-state response of the rotor system. Zapoměl [22] presented an enhanced mathematical model based on a bilinear constitutive law and studied the effect of MRD on the force transmission and vibration attenuation of a rotor system. Although the dynamic characteristics of rotor system with MRD has been extensively investigated and the theory is mature, the squirrel cage supporting coupled with rotor system with MRD and the effect mechanism of MRD to a rotor system are rarely involved.…”

Section: Introductionmentioning

confidence: 99%

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Study on the Effect Mechanism of MRD to Rotor System

Wang

Zhang

et al. 2019

Applied Sciences

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Magnetorheological damper (MRD), a semi-active control device, has the stability of the passive control device and the adaptive ability of the active control device. It is considered to be an ideal replacement for the squeeze film damper (SFD) and has been extensively investigated. However, the effect mechanism of MRD to a rotor system is still unclear, which will influence the structural design and control strategy of MRD. This paper aims to propose a general MRD excitation model for a rotor system and discover the effect mechanism. First, the effects of current and eccentricity on mechanical properties of MRD are studied in detail and approaches suppressing the vibration amplitude of a rotor system are put forward. Then, a general model considering MRD, ball bearing and squirrel cage is proposed. Based on the finite element method, the dynamic equations of a rotor-bearing-squirrel cage system with MRD and mass imbalance are presented. Finally, the influences of MRD on the dynamic characteristics of the rotor system are investigated, and the effect mechanism is discovered. In addition, the nonlinearity which is not desirable as it causes fluctuating stresses in the main components of the rotor system and eventually leads to their failure due to fatigue, are observed. The changes of damping and stiffness of MRD can alter the damping performance of MRD and the suitable range of current forms the zone of effective damping, which lays helpful guidance for the design and application of the MRD.

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Section: Theory and Model Of Mrdmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on the Effect Mechanism of MRD to Rotor System

Wang

Zhang

et al. 2019

Applied Sciences

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“…The developed mathematical model of the magnetorheological SFD is based on the assumptions of the hydrodynamic lubrication theory [17] except those for the lubricant. The pressure distribution in the full fluid film is governed by RE adapted for the bilinear material [18] ( )…”

Section: Pressure Distribution In the Classical And Magnetorheologicamentioning

confidence: 99%

Numerical computation of the damping and stiffness coefficients of the classical and magnetorheological squeeze film damper

et al. 2018

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Technological solution, frequently used to suppress vibrations in rotating machines, consists in adding damping devices between the rotor and its frame. This is enabled by dampers working on the principle of a squeezing thin classical or magnetorheological fluid film. The Navier-Stokes equations, Reynolds equation, and modified Navier-Stokes equations are used to determine the pressure distribution in the thin fluid film. The damping and stiffness coefficients are computed by the developed procedure presented in this paper. The proposed computational approach is based on the perturbation of the synchronous circular whirling motion. The carried-out computational simulations show that the investigated mathematical models of the squeeze film damper and magnetorheological squeeze film damper allowed computation of the damping and stiffness coefficients. It has been found that the stiffness coefficients computed by the proposed mathematical models may be different.

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“…A technological solution frequently used for suppressing these undesirable effects consists in inserting damping devices in the rotor supports. The analysis carried out in [1] shows that to achieve their high efficiency their damping effect must be adaptable to the operating speed. In the field of rotordynamics this is offered by squeeze film dampers lubricated by magnetorheological oils.…”

Section: Introductionmentioning

confidence: 99%

A computational study on the influence of the delayed yielding phenomenon in magnetorheological oils on the steady state vibration and forces transmitted between the rotor and its frame

2018

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Abstract. The theoretical analyses and practical experience show that only the damping effect adaptable to the current operating conditions makes it possible to achieve optimum performance of damping devices inserted in the supports of rotating machines. This is offered by magnetorheological squeeze film dampers. The magnetorheological oils are liquids sensitive to magnetic induction. Their response to the change of a magnetic field is not instantaneous, but it is a process called the delayed yielding. The research was focused on enhancement of the mathematical model of the magnetorheological squeeze film damper by considering the delayed yielding phenomenon and on its application for the study of the influence of the delayed yielding on the force transmission between the rotor and its stationary part. The results of the computational simulations show that rising value of the delayed yielding time constant that characterizes the delayed yielding process reduces the damping effect and efficiency of the magnetorheological damping devices.

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Modelling of magnetorheological squeeze film dampers for vibration suppression of rigid rotors

Cited by 53 publications

References 23 publications

Study on the Effect Mechanism of MRD to Rotor System

Study on the Effect Mechanism of MRD to Rotor System

Numerical computation of the damping and stiffness coefficients of the classical and magnetorheological squeeze film damper

A computational study on the influence of the delayed yielding phenomenon in magnetorheological oils on the steady state vibration and forces transmitted between the rotor and its frame

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