This paper presents numerical analysis of the dynamic characteristics of an air bearing system of a magnetic head under ultra-thin spacing. First, the static pressure distribution is numerically calculated by using up-wind scheme for a very large bearing number and a harmonic algorithm to calculate the flux factor for the abrupt change of film thickness. Then, the dynamic characteristics are analyzed in frequency domain by a perturbation method and finite difference method. The varying tendencies of the stiffness and damping coefficient in the translation, pitch and rolling directions with the frequency and the minimum film height are obtained.

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