Modeling and Vibration Analysis of Spinning Hard Disk and Head Assembly

抄録

A read/write head assembly attached to a spinning disk was modeled and investigated through a different approach, in which the head assembly was represented by a suspension arm with an attached mass and an air spring (film) at its free end. The receptance method was applied to connect the spinning disk and the head assembly. The natural frequencies and mode shapes of the combined spinning disk-fixed head assembly as a whole were then interpreted. Numerical results showed that the head assembly induced extra modes from a single disk. Even for just weak coupling between disk and head, the bifurcations of mode shapes were very obvious, but the changes of natural frequencies were slight. The effects on frequency changes due to head's flexibility, air spring constant, head's location, and spinning speed were examined as well. Disk's spinning speed was found to pull the disk-head frequency loci to pass through the crossings of single disk's frequency loci and induce curve veering phenomenon.