Numerical Analysis on Dynamic Characteristics of Flying Magnetic Head with Ultra Thin Spacing

This paper presents numerical analysis of the dynamic characteristics of an air bearing system of a magnetic head with ultra-thin spacing. The dynamic response of the air film is analyzed with the momentum equations and the time-dependent modified Reynolds equation based on the FK-Boltzmann modified model. The static pressure distribution is numerically calculated firstly by using an up-wind scheme for a very large bearing number and a harmonic average method is used for calculating the flux factor of film thickness with abrupt steps. Then, the dynamic characteristics are analyzed in frequency domain with the perturbation method as well as the finite difference method. The variation tendencies of the stiffness and damping coefficient with the frequency in the translation, pitch and rolling directions and the minimum film thickness are obtained and studied.