NUMERICAL SIMULATIONS OF SLIDER INTERACTION WITH MULTIPLE ASPERITY USING HERTZIAN CONTACT MODEL

A numerical simulation of slider-disk contact in a magnetic hard disk drive is studied using the Hertzian contact model. The slider-disk con tact is caused by flying height fluctuation due to disk runout for ver y low flying sliders. The rough disk topography is generated numerical ly by combining a sinusoidal waviness and a Gaussian roughness. For ea ch asperity contact, the radius of curvature is calculated from the di sk topography, and the radius is used to calculate the contact force u sing the Hertzian contact model. The slider's response to a single asp erity calculated using the Hertzian contact model agrees well with the result obtained using the impulse-momentum based contact model. The s imulation results of slider-disk contact including suspension dynamics are calculated with and without friction far a ''nano-slider.''