Abstract
The rarefaction-modified Reynolds equation considering porosity of thin liquid lubricant film coated over a sliding surface was extended to solve dynamic problems. Applying the perturbation method, a calculation procedure based on the FEM method for obtaining stiffness and damping of gas lubricating films over a permeable liquid lubricant was formulated. Calculations were then performed for specified flying head sliders. Effects of the permeability and the porosity correction coefficient which serve to increase molecular mean free path were presented, focusing on landing on/off characteristics and the stiffness and damping versus vibration frequency characteristics. It was found that the permeability and the porosity correction coefficient increasingly affect landing on/off characteristics in the higher velocity region, and that permeability is effective to increase damping of lubricating film.
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