JOT 1994 Abstract
The Effects of Baseplate Warping and Skew
on the Configuration of a Spinning Flexible Disk
R.Y. Wu and G.G. Adams
Summary
The behavior of a flexible disk, spinning in close proximity to a warped/skewed
stationary baseplate, is investigated. The governing partial differential equation
for the disk deflection is coupled to the Reynolds equation of the air film. Four
warped/skewed baseplate configurations are modeled. The effects of baseplate warpage
and skew on the steady-state configuration of the disk are determined by investigating
small deviations away from the axisymmetric configuration of the disk corresponding to
a perfect baseplate. Exponential Fourier series expansions in the circumferential
direction, along with finite differences in the radial direction, are used. Numerical
results are determined and compared for various values of the angular velocity and
initial thicknesses of the air film. Among the three warpages considered, the saddle
warped baseplate provides the largest change in disk deflection whereas the spherically
warped baseplate gives the smallest change. The total response of the disk is obtained
by superposition of the deflection change caused by the warped/skewed baseplate and the
deflection obtained from the axisymmetric solution.
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