Browsing by Subject "Suspensions (components)"

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    Heating of magnetic fluid systems driven by circularly polarized magnetic field
    (Elsevier BV * North-Holland, 2010) Ahsen, O. O.; Yilmaz, U.; Aksoy, M. Deniz; Ertas, G.; Atalar, Ergin
    A theory is presented to calculate the heat dissipation of a magnetic suspension, a ferrofluid, driven by circularly polarized magnetic field. Theory is tested by in vitro experiments and it is shown that, regardless of the character of the relaxation process, linearly and circularly polarized magnetic field excitations, having the same root-mean-square magnitude, are equivalent in terms of heating efficiency.
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    ItemOpen Access
    On the H∞ controller design for a magnetic suspension system model
    (Elsevier, 2013) Karagül, E.; Özbay, Hitay
    This paper deals with the H∞ optimal controller design for a magnetic suspension system model derived in Knospe and Zhu [2011], with added input/output delay. The plant is a fractional order system with time delay i.e., the transfer function of the plant involves infinite dimensional terms including a rational function of √/s and e-hs, where h > 0 represents the delay. The H∞ optimal controller is designed by using the recent formulation given in Ozbay [2012] for the mixed sensitivity minimization problem for unstable infinite dimensional plants with low order weights. The effect of time delay on the achievable performance level is illustrated. © 2013 IFAC.