Design and testing of magnetorheological valve with fast force response time and great dynamic force range

Kubík, Michal; Macháček, Ondřej; Strecker, Zbyněk; Roupec, Jakub; Mazůrek, Ivan

doi:10.1088/1361-665x/aa6066

Cited by 63 publications

(48 citation statements)

References 26 publications

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“…However, the primary response time for control current drop is independent of piston velocity. It is noteworthy that similar trends were experimentally determined in other research studies [42,43].…”

Section: Influence Of Electric Conductivitysupporting

confidence: 89%

Multiphysics Model of an MR Damper including Magnetic Hysteresis

Kubík

Gołdasz²

2019

Shock and Vibration

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Hysteresis is one of key factors influencing the output of magnetorheological (MR) actuators. The actuators reveal two primary sources of hysteresis. The hydro(mechanical) hysteresis can be related to flow dynamics mechanisms and is frequency- or rate-dependent. For comparison, the magnetic hysteresis is an inherent property of ferromagnetic materials forming the magnetic circuit of the actuators. The need for a good quality hysteresis model has been early recognized in studies on MR actuators; however, few studies have provided models which could be used in the design stage. In the paper we reveal a hybrid multiphysics model of a flow-mode MR actuator which could be used for that purpose. The model relies on the information which can be extracted primarily from material datasheets and engineering drawings. We reveal key details of the model and then verify it against measured data. Finally, we employ it in a parameter sensitivity study to examine the influence of magnetic hysteresis and other relevant factors on the output of the actuator.

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Section: Influence Of Electric Conductivitysupporting

confidence: 89%

Multiphysics Model of an MR Damper including Magnetic Hysteresis

Kubík

Gołdasz²

2019

Shock and Vibration

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“…2 left, number 1. The second motivation to use MRFs is in MR devices, as magnetorheological damper (Kubík et al, 2017;Strecker et al, 2015) or clutch (Imaduddin et al, 2015),because the same fluid is used for damping and sealing at the same time.…”

Section: Magnetorheological Fluid Seals (Mrfs)mentioning

confidence: 99%

Magnetorheological fluid seal with minimum friction torque

2018

Engineering Mechanics

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The paper deals with design and tests of MagnetoRheological Fluid seal (MRFs) using innovative conception of magnetic circuit. The common design of magnetic seal uses ferrofluid. Low friction torque and low burst pressure are typical for this kind of seals. Replacement of the ferrofluid by magnetorheological fluid increases the burst pressure; however, the friction torque increase too. The optimum for sealing is low friction torque and high burst pressure. The new design of MRFs described in this paper meets both requirements; is based on gradient-pinch mode. The friction torque and burst pressure of this type of design and common design of MRFs were tested and compared. The new design of MRFs achieved 20 times lower friction torque that current solution MRFs. The developed MRFs combines the benefits of common FFs and MRFs.

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“…This action increases the shear stress of ERF [3]. MRF induction and shear features have a lot of common in comparison to ERF [6]. Except that magnetic field strength is needed to activate MRF.…”

Section: Approximation Of Erf and Mrf Rheological Characteristicsmentioning

confidence: 99%