Vibrations of a slider with a pseudocontact ABS design on a sliding disk

This paper presents a study on the vibrations of slider with a pseudocontac t ABS (air-bearing surface) design on a sliding disk. A theoretical model i s developed for the slider vibrations, which takes into account the effect of air bearing and interface contact. It is found that partial contact incr eases the natural frequency of the slider air-bearing system, and that the shift between contact and loss of contact causes nonlinear vibrations of th e system. A typical interface with a proximity recording slider is numerica lly investigated by using the generalized Reynolds equation and the Greenwo od-Williamson model. The slider interference stiffness and the disk contact stiffness are discussed, and the dependence of natural frequencies on disk contact stiffness is evaluated. For global nonlinear vibration characteris tics to be quantified, the theoretical model is simplified to a single-degr ee-of-freedom system and a comprehensive closed-form solution is derived. T he solution shows that the system under external excitation exhibits variou s nonlinear resonances, including superharmonic resonances, subharmonic res onances, and the basic primary resonance. A numerical analysis of the simpl ified model also shows that the frequency response curves exhibit multipole resonant peaks. Finally, it is illustrated that these derived results agre e qualitatively well with some existing experiments.