Experimental and Numerical Study on the Dynamic Behavior of a Spinning Flexible Disk Close to a Rotating Rigid Wall

Abstract

In the present work, the behavior of a flexible disk rotating close to a fixed, a co-rotating, and a counter rotating flat-stabilizers in open air is investigated both experimentally and numerically. The Navier-Stokes equations along with the continuity equation representing the flow in the air-film are discretized using the finite volume method and solved numerically with the SIMPLE algorithm. An experimental test-rig is designed to investigate the effects of the rotation speed, the initial gap height and the inlet-hole size on the flexible disk displacement and its vibration amplitude. Finally, a comparison between the experimental and the numerical results is made.

Towards a Flat Rotating Flexible Disk for High Speed Optical Data Storage

“…The geometrical parameters of the manufactured curved stabilizers are given in Table I where the rotation speed of the disk at the presented results is 10,000 rpm. The reason why we have chosen these parameters is that it was proved from our previous experimental work that some combination of these geometrical parameters reduces the axial run-out of the disk, with a rigid flat stabilizer, reasonably (h 0 of 200 mm with r in of 15.5 mm, h 0 of 250 mm with r in of 15.5 mm, and h 0 of 300 mm with r in of 18.0 mm), Gad and Rhim, 7) while other combinations were introduced to investigate the effect of the inlet mass flow rate on the disk flatness and axial run-out.…”

“…In their following researches, they improved their stabilizer design moving from localized disk stabilization towards global disk stabilization by using asymmetrically arranged triangular stabilizer; later, this was replaced with a cylindrically concaved stabilizer that enables stable driving of the flexible disk at rotational speeds over 10,000 rpm. Also, Gad and Rhim [5][6][7] have investigated the behavior of flexible disks with different thicknesses and different material properties rotating close to fixed and co-rotating flat-stabilizers both numerically and experimentally. Recently, Sugimoto et al 8) used a cylindrically concaved stabilizer to investigate the effects of the stabilizer curvature, disk thickness, and disk materials on the aerodynamic stability and demonstrated recording and reproduction at 4Â speed for Blu-ray disc (BD) density.…”

Passive-Damping of the Axial Run-Out for High Speed Rotating Flexible Optical Disk Using the Idea of Damping Orifice

“…In their following researches, they improved their stabilizer design moving from localized disk stabilization towards global disk stabilization. Also, Gad and Rhim [6][7][8] have investigated the behavior of flexible disks with different thicknesses and different material properties rotating close to fixed and corotating flat-stabilizers. Recently, Sugimoto et al 9) used a cylindrically concaved stabilizer to investigate the effects of the stabilizer curvature, disk thickness, and disk materials on the aerodynamic stability.…”

“…The reason for the choice of these values is that it was proved from our previous experiments that this combination reduces the axial run-out of the disk with a rigid flat stabilizer, Gad and Rhim. 8) The drilled orifices are of rectangular-edge geometry.…”