TT 1992 Abstract
The Point-Load Solution Using Linearized von Karman
Plate Theory For a Spinning Flexible Disk Near a Baseplate
J.F. Maher and G.G. Adams
Summary
In magnetic and/or optical recording on flexible media, an elastic
disk rotates at constant angular velocity in close proximity to a
stationary baseplate. Such a configuration is used to stabilize the
transverse motion of the flexible disk whose natural frequencies and
critical speeds would otherwise be too low for stability of the
flexible-disk-to-head interface. The influences of coupling
between the in-plane displacements and transverse deflections (von
Karman plate theory) and of the air flow between the disk
and the baseplate are investigated.
Steady-state solutions, for this nonaxisymmetric problem, are obtained
by linearizing the partial differential equations about the axisymmetric
configuration due to the baseplate alone. These equations are solved
using an exponential Fourier series expansion in the circumferential
direction and a finite difference approximation radially. The results
are the transverse and in-plane deflections of the disk and the air film
pressure. Comparisons are made with other models in which von
Karman effects have been omitted and in which the air flow has
been treated in a simplifed manner.
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