The Point-Load Solution and Simulation of a Flexible Spinning Disk Using Various Disk-to-Baseplate Air-Flow Models

Abstract

In magnetic and/or optical recording on flexible media, an elastic disk rotates at a constant angular velocity in close proximity to a stationary baseplate. Such a configuration can be 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. In this investigation, the air-flow between the disk and the baseplate is accounted for by two foundation parameters, stiffness and damping, for each Fourier mode. The effect of using this new model and three other models on the point-load solution and on the simulation of the disk-to-head interface is investigated. Steady-state solutions are obtained by using an exponential Fourier series expansion in the circumferential direction and a finite difference approximation radially. The simulation solution also accounts for the effect of disk-to-head contact in an approximate manner. It is further shown that the use of a Féjer sum for the Fourier series can accelerate the convergence of the simulation solution.

Presented as a Society of Tribologists and Lubrication Engineers paper at the ASME/STLE Tribology Conference In San Diego, California, October 19–21, 1992

KEYWORDS:

• Magnetic Data Storage Systems
• Floppy Disks

Notes

Presented as a Society of Tribologists and Lubrication Engineers paper at the ASME/STLE Tribology Conference In San Diego, California, October 19–21, 1992