Time-dependent CFD and quasi-static analysis of magnetorheological fluid dampers with experimental validation

Parlak, Zekeriya; Engin, Tahsin

doi:10.1016/j.ijmecsci.2012.08.006

Cited by 56 publications

(51 citation statements)

References 14 publications

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“…Thus it is shown that fluid elasticity suffices to induce stiffness in the damper behaviour even if fluid compressibility is not accounted for. The PTT predictions resemble also the experimental results concerning magnetorheological dampers [24,3,20,8,25], which is explained by the fact that shear-thinning is in some respects similar to plasticity. For more accurate modelling of MR dampers an elastoviscoplastic constitutive equation should be used instead.…”

Section: Discussionsupporting

confidence: 78%

“…Before ending this introductory section, it is worth mentioning that damper stiffness is observed experimentally also in other types of fluid damper, including magnetorheological (MR) [24,3,20,8,25] and extrusion dampers [26]. The experimental hysteresis loops obtained for these kinds of dampers are also qualitatively very similar to the present PTT results (but not the CY results), indicating that fluid elasticity is an important factor for these dampers as well.…”

Section: Introductionsupporting

confidence: 78%

“…13b (to account for the minus sign in Eq. (25)) and superimposing the plot of M p a p shown in Fig. 19b.…”

Section: Applied Forcementioning

confidence: 99%

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Theoretical study of the flow in a fluid damper containing high viscosity silicone oil: Effects of shear-thinning and viscoelasticity

2018

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The flow inside a fluid damper where a piston reciprocates sinusoidally inside an outer casing containing high-viscosity silicone oil is simulated using a Finite Volume method, at various excitation frequencies. The oil is modelled by the Carreau-Yasuda (CY) and Phan-Thien & Tanner (PTT) constitutive equations. Both models account for shear-thinning but only the PTT model accounts for elasticity. The CY and other generalised Newtonian models have been previously used in theoretical studies of fluid dampers, but the present study is the first to perform full two-dimensional (axisymmetric) simulations employing a viscoelastic constitutive equation. It is found that the CY and PTT predictions are similar when the excitation frequency is low, but at medium and higher frequencies the CY model fails to describe important phenomena that are predicted by the PTT model and observed in experimental studies found in the literature, such as the hysteresis of the force-displacement and force-velocity loops. Elastic effects are quantified by applying a decomposition of the damper force into elastic and viscous components, inspired from LAOS (Large Amplitude Oscillatory Shear) theory. The CY model also overestimates the damper force relative to the PTT, because it underpredicts the flow development length inside the piston-cylinder gap. It is thus concluded that (a) fluid elasticity must be accounted for and (b) theoretical approaches that rely on the assumption of one-dimensional flow in the piston-cylinder gap are of limited accuracy, even if they account for fluid viscoelasticity. The consequences of using lower-viscosity silicone oil are also briefly examined. This is the accepted version of the article published in:

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Section: Discussionsupporting

confidence: 78%

Section: Introductionsupporting

confidence: 78%

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Theoretical study of the flow in a fluid damper containing high viscosity silicone oil: Effects of shear-thinning and viscoelasticity

2018

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“…The MRF temperature can be measured through slip rings, and thus MRF performance at different temperatures and different input shaft speeds under different magnetic field strengths can be further obtained [6] [7].…”

Section: Structural Composition and Working Principle Of Retarder Mrfmentioning

confidence: 99%

An Experimental Study of Retarder MRF Performance Testing Device

Jie¹,

Dong²,

Yu³

et al. 2015

Proceedings of the 3rd International Conference on Mechanical Engineering and Intelligent Systems (ICMEIS 2015)

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Abstract. The paper designs a performance test device to detect the performance of the magnet-orheological retarder at different temperatures,different magnetic fields and different speeds, and completed the experimental study. The device structure has the characteristic of simple, reliable drive, convenient and high precision,and test the rheological properties of magneto-rheological fluid under different temperatures, different magnetic field strength.The test device has advantage of small residual magnetism, test data accurate,good repeatability of test data and low power consumption.

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“…Some researchers [4] have conducted the study on MR damper with combination of shear and squeeze mode by using Finite Element Method Magnetics (FEMM). Whereas, some researchers [5] have analyzed the fluid flow through the annular gap by quasi-static analysis and CFD analysis of MR damper has been studied. The prior investigators [6] have considered the & Hemanth Krishna ckh4545@gmail.com magnetic saturation analysis of magnetorheological damper for single coil and double coil arrangement by using FEM and developed nonparametric model, based on magnetic flux density in the fluid flow gap.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Magneto-Rheological Damper for Maximizing Magnetic Flux Density in the Fluid Flow Gap Through FEA and GA Approaches

Hemanth

Kumar

Gangadharan

2016

J. Inst. Eng. India Ser. C

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A magneto rheological (MR) fluid damper offers cost effective solution for semiactive vibration control in an automobile suspension. The performance of MR damper is significantly depends on the electromagnetic circuit incorporated into it. The force developed by MR fluid damper is highly influenced by the magnetic flux density induced in the fluid flow gap. In the present work, optimization of electromagnetic circuit of an MR damper is discussed in order to maximize the magnetic flux density. The optimization procedure was proposed by genetic algorithm and design of experiments techniques. The result shows that the fluid flow gap size less than 1.12 mm cause significant increase of magnetic flux density.

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Time-dependent CFD and quasi-static analysis of magnetorheological fluid dampers with experimental validation

Cited by 56 publications

References 14 publications

Theoretical study of the flow in a fluid damper containing high viscosity silicone oil: Effects of shear-thinning and viscoelasticity

Theoretical study of the flow in a fluid damper containing high viscosity silicone oil: Effects of shear-thinning and viscoelasticity

An Experimental Study of Retarder MRF Performance Testing Device

Optimization of Magneto-Rheological Damper for Maximizing Magnetic Flux Density in the Fluid Flow Gap Through FEA and GA Approaches

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