A new mathematical model of a short magnetorheological squeeze film damper for rotordynamic applications based on a bilinear oil representation – derivation of the governing equations

Zapoměl, Jaroslav; Ferfecki, Petr; Forte, Paola

doi:10.1016/j.apm.2017.07.040

Cited by 25 publications

(12 citation statements)

References 18 publications

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“…The volume fraction of the particles is set to 19%. Carrying out explicit computations of the effective coefficients in (35), (36) and (37) we obtain, ν s β s µ HS…”

Section: Couette Flowmentioning

confidence: 99%

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Multiscale modeling of magnetorheological suspensions

Nika

Vernescu

2019

Z. Angew. Math. Phys.

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We develop a multiscale approach to describe the behavior of a suspension of solid magnetizable particles in a viscous non-conducting fluid in the presence of an externally applied magnetic field. By upscaling the quasi-static Maxwell equations coupled with the Stokes' equations we are able to capture the magnetorheological effect. The model we obtain generalizes the one introduced by Neuringer & Rosensweig [24], [27] for quasistatic phenomena. We derive the macroscopic constitutive properties explicitly in terms of the solutions of local problems. The effective coefficients have a nonlinear dependence on the volume fraction when chain structures are present. The velocity profiles computed for some simple flows, exhibit an apparent yield stress and the flow profile resembles a Bingham fluid flow.

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“…The volume fraction of the particles is set to 19%. Carrying out explicit computations of the effective coefficients in (35), (36) and (37) we obtain, ν s β s µ HS…”

Section: Couette Flowmentioning

confidence: 99%

“…Although the Bingham model has proven itself useful in characterizing the behavior of magnetorheological fluids, it is not always sufficient. Recent experimental data show that true magnetorheological fluids exhibit departures from the Bingham model [12], [35], [36].…”

Section: Introductionmentioning

confidence: 99%

Multiscale modeling of magnetorheological suspensions

Nika

Vernescu

2019

Z. Angew. Math. Phys.

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“…However, in subsequent years the controllable SFDs working in active [10,11] or semiactive concepts [12][13][14][15][16][17][18][19] have been developed. The concept of semi-active working mode accomplished by the electromagnetic principle is represented with SFDs lubricated by electrorheological [12,13] or magnetorheological [16][17][18][19] fluids.…”

Section: Introductionmentioning

confidence: 99%

A computational fluid dynamics investigation of the segmented integral squeeze film damper

et al. 2019

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Rotor vibration attenuation is achieved with damping devices which work on different, often mutually coupled, physical principles. Squeeze film dampers are damping devices that have been widely used in rotordynamic applications. A new concept of a 5-segmented integral squeeze film damper, in which a flexure pivot tilting pad journal bearing is integrated, was investigated. The damper is studied for the eccentric position between the outer and inner ring of the squeeze film land. The ANSYS CFX software was used for solving the pressure and velocity distribution. The development of the complex three-dimensional computational fluid dynamics model of the squeeze film damper, learning more about the effect of the forces in the damper, and the knowledge about the behaviour of the flow are the principal contributions of this article.

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“…Then the pressure distribution in the full oil film is governed by the modified Reynolds equation [9] …”

Section: The Damping Device Modelmentioning

confidence: 99%

“…The design and work principles of magnetorheological dampers for rotordynamic applications are reported in [3][4][5]. The corresponding mathematical models applicable for computational simulations were developed and presented by Kim et al [6], Zapoměl et al [7][8][9], and other authors.…”

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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A new mathematical model of a short magnetorheological squeeze film damper for rotordynamic applications based on a bilinear oil representation – derivation of the governing equations

Cited by 25 publications

References 18 publications

Multiscale modeling of magnetorheological suspensions

Multiscale modeling of magnetorheological suspensions

A computational fluid dynamics investigation of the segmented integral 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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