Abstmct-This reseamh deals with dynamics of a permanent magnet freely levitatedabove an excitedhigh-T, superconktor. Vertical restoring forces acting on the magnet wem evalmted by analysis based on fhe critical state and flux flow models. The resdts show nonlineati.ty andfreqplzncy-dependence of the forces, which were obsemed in experiments. Vertical vibration properties of the system were also evaluated analytically by considering the above properties of the restoring forces. 'Ihe resdts show good agreement with experimental ones, which inclule effect of the frequency-dependent stiffness on the resonant fttcplency, the primary resonance characteristics, stability ofthe steady,-state motions andso on.

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