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Browse Prior Art Database

Disk with Grooved Edge

IP.com Disclosure Number: IPCOM000080540D
Original Publication Date: 1974-Jan-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 25K

Publishing Venue

IBM

Related People

Martin, RL: AUTHOR [+2]

Abstract

Structural elements in a fluid flow situation may exhibit vibrations, due to periodic transverse forces associated with "vortex shedding" For a given fluid velocity, a plate, for example, may have vibration that is significantly affected by the trailing edge geometry. The stability of a plate with a grooved edge (4) is shown to be superior compared to a plate with square (1), rounded (2), and pointed (3) edges, as shown in the figure.

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Disk with Grooved Edge

Structural elements in a fluid flow situation may exhibit vibrations, due to periodic transverse forces associated with "vortex shedding" For a given fluid velocity, a plate, for example, may have vibration that is significantly affected by the trailing edge geometry. The stability of a plate with a grooved edge (4) is shown to be superior compared to a plate with square (1), rounded (2), and pointed (3) edges, as shown in the figure.

In the case of disks utilized, for example, in disk memory systems, disk edge geometry is a significant factor affecting disk flutter. A grooved edge disk has the least amount of flutter. Reducing flutter permits improved magnetic head disk compliance, and head track registration in a storage system. The amount of grooving and particular angle of grooving are empirical functions, determined by the thickness of the disk and rotational speed desired in relation to the flutter obtained.

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