A linear stroke MR fluid damper was built and characterised over temperatures ranging from 0 to 100 °C. The measured peak damper force, for a constant applied field of 2.5 A, was shown to decrease by 37% as temperature increased from 0 to 100 °C. Aside from external heating, an MR damper may internally self-heat due to both resistive heating by the electromagnetic coil and to a greater extent, by dissipating mechanical energy into thermal energy. Temperature can significantly alter damper behaviour, as the fluid viscosity and accumulator gas pressure are highly dependent on temperature. Several existing damper models exhibit the ability to capture key features of the pre-yield and post-yield force behaviour of an MR damper that can be observed across a large temperature range; however, few models have addressed the implications of temperature. To accurately model the damper force over temperatures ranging from 0 to 100 °C and to gain insight into how temperature affects damper force behaviour, a hydro-mechanical analysis of the MR damper was developed, which provided a lump parameter model with a physical connection to damper geometry and MR fluid properties. It was shown that the proposed model captured the pre-yield hysteresis with the hyperbolic tangent function, prescribing that the onset of the yield force with the shaping parameters λ1, and λ2. λ1, is dependent on temperature and is correlated with the accumulator pressure, while λ2 is relatively insensitive to temperature, but correlated with the applied field. The yield force ƒy is shown to be dependent on temperature and decreases by up to 30% as temperature increased from 0 to 100 °C. Further investigation is required to better identify the mechanism causing this temperature-related decrease in yield force. The model also captured the post-yield force behaviour, which can dramatically change over temperatures ranging from 0 to 100 °C. The post-yield damping cpo was shown to be directly proportional to fluid viscosity, which is highly temperature dependent and decreased up to 85%. The stiffness kd was shown to be linearly proportional to temperature over the temperature range of 0 to 100 °C and increases significantly by several hundred percent. The fluid interia mƒ was found to be fairly insensitive to temperature, but dependent on applied field. As temperature increased, the time at which the peak force occurred during the stroke cycle could shift. This was most evident at large applied fields (ie., 2.5 A) as the peak force shifted from occurring before the maximum piston velocity was reached at mid-stroke to occurring after. This is due to stiffness and inertial effects. The parameter kd provides the mechanism to capture the damper stiffness from the pneumatic accumulator and the parameter mƒ provides the mechanism to capture the effects of fluid inertia. As kd increases, the peak force shifts toward occurring after the maximum piston velocity and as mƒ increases relative to kd the peak force shifts toward occurring before the maximum piston velocity, causing the force overshoot phenomenon at large applied fields.


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Analysis of a magnetorheological damper incorporating temperature dependence


    Weitere Titelangaben:

    Analyse eines magnetorheologischen Dämpfers einschließlich der Temperaturabhängigkeit


    Beteiligte:
    Wilson, Nicholas L. (Autor:in) / Werely, Norman M. (Autor:in) / Hu, Wei (Autor:in) / Hiemenz, Gregory J. (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    2013


    Format / Umfang :

    22 Seiten, 17 Bilder, 39 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch





    Analysis of a magnetorheological damper incorporating temperature dependence

    Wilson,N. / Wereley,N.M. / Hiemenz,G.J. et al. | Kraftfahrwesen | 2013



    Analysis of a Magnetorheological Fluid Damper Incorporating Temperature Dependence

    Wilson, N. / Wereley, N. / American Institute of Aeronautics and Astronautics | British Library Conference Proceedings | 2010


    Magnetorheological damper

    TRAUERNICHT JARED L / HOPKINS BRIAN RUSSELL / ANDERFAAS ERIC NELS | Europäisches Patentamt | 2021

    Freier Zugriff