The performance of a smart ball-and-socket actuator applied to upper-limb rehabilitation

Ali El-Wahed, Loaie Balkhoyor

    Research output: Contribution to journalArticle

    1 Citation (Scopus)
    54 Downloads (Pure)

    Abstract

    Magnetorheological fluids are capable of providing continuously variable yield stresses in response to external magnetic fields. Greater potential application in rehabilitation may be realised if these fluids are utilised in controllable actuators offering multi-degree-of-freedom motions. This article presents the results of the comparative performance of a ball-and-socket actuator, employing magnetorheological fluids as the controllable medium, using theoretical and numerical approaches. The theoretical model combines the viscous friction and the controllable field-dependent characteristics of the magnetorheological fluid in which a Bingham plastic model is used to simulate the shear stress of the fluid under various input conditions. A special procedure to simulate the device performance using computational fluid dynamics techniques, which were performed using ANSYS CFX computer code, is detailed. Three commercial magnetorheological fluids (MRF241-ES, MRF132-AD and MRF122-2ED) were assessed and it was found that the simulated values of the device torque compared well with the theoretical values.

    Original languageEnglish
    Pages (from-to)2811-2822
    Number of pages12
    JournalJournal of Intelligent Material Systems and Structures
    Volume29
    Issue number13
    Early online date18 Jun 2018
    DOIs
    Publication statusPublished - Aug 2018

    Fingerprint

    Magnetorheological fluids
    Patient rehabilitation
    Actuators
    Fluids
    Yield stress
    Shear stress
    Computational fluid dynamics
    Torque
    Friction
    Magnetic fields
    Plastics

    Keywords

    • ball-and-socket actuator
    • computational fluid dynamics simulations
    • Magnetorheological fluids

    Cite this

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    abstract = "Magnetorheological fluids are capable of providing continuously variable yield stresses in response to external magnetic fields. Greater potential application in rehabilitation may be realised if these fluids are utilised in controllable actuators offering multi-degree-of-freedom motions. This article presents the results of the comparative performance of a ball-and-socket actuator, employing magnetorheological fluids as the controllable medium, using theoretical and numerical approaches. The theoretical model combines the viscous friction and the controllable field-dependent characteristics of the magnetorheological fluid in which a Bingham plastic model is used to simulate the shear stress of the fluid under various input conditions. A special procedure to simulate the device performance using computational fluid dynamics techniques, which were performed using ANSYS CFX computer code, is detailed. Three commercial magnetorheological fluids (MRF241-ES, MRF132-AD and MRF122-2ED) were assessed and it was found that the simulated values of the device torque compared well with the theoretical values.",
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    The performance of a smart ball-and-socket actuator applied to upper-limb rehabilitation. / El-Wahed, Ali; Balkhoyor, Loaie.

    In: Journal of Intelligent Material Systems and Structures, Vol. 29, No. 13, 08.2018, p. 2811-2822.

    Research output: Contribution to journalArticle

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    AU - Balkhoyor, Loaie

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