MODELING AND VIBRATION ANALYSIS OF SPINNING-DISK AND MOVING-HEAD ASSEMBLY IN COMPUTER-STORAGE SYSTEMS

Vibration of a spinning disk subject to a moving head that is frequent ly encountered in computer storage system, is studied. The magnetic he ad moving on the spinning disk is modelled as a harmonically varying l oad traveling in the radial direction. The spinning disk responses are solved for analytically through an approach that employs the Galerkin 's method and some solution techniques. Examples of various lending co nditions are then illustrated and discussed. The load's moving speed w as found to act as a driving frequency and it would cause resonances a t certain speeds. The resonances caused by individual parameters were addressed and marked as critical spinning speed and critical moving sp eed. A resonant equation that correlated the three parameters, disk sp inning speed (Omega), load moving speed (v), and load frequency (omega ), was derived and the corresponding resonant surfaces were shown in g raphs. The resonant phenomena due to the interactions of parameters ar e then realized. The disk's transient responses to moving loads are al so illustrated. The results showed that a constant-amplitude moving lo ad caused no oscillatory motion as it moved from fixed end to free end but it did cause oscillation as the load moved in reverse way. A harm onic moving load, however, always results in oscillations as expected.