Three-dimensional electromagnetic analysis of hard disk drive suspension interconnects with periodic apertures in reference plane

2009 ◽  
Vol 105 (7) ◽  
pp. 07C128 ◽  
Author(s):  
Eunkyu Jang
Keyword(s):  
Hard Disk Drive ◽  
Three Dimensional ◽  
Hard Disk ◽  
Disk Drive ◽  
Reference Plane ◽  
Electromagnetic Analysis

Experimental Study of the Flow in a Simulated Hard Disk Drive

2006 ◽  
Vol 128 (5) ◽  
pp. 1090-1100 ◽  
Author(s):  
Charlotte Barbier ◽  
Joseph A. C. Humphrey ◽  
Eric Maslen
Keyword(s):  
Hard Disk Drive ◽  
Three Dimensional ◽  
Turbulence Models ◽  
Hard Disk ◽  
Disk Drive ◽  
Particle Image Velocimetry Technique ◽  
Mean Velocity ◽  
Local Flow ◽  
The Mean ◽  
Fundamental Value

Instantaneous circumferential and radial velocity components of the air flowing past a symmetrical pair of suspension/slider-units (SSUs) attached to an E-Block/arm were measured in a specially designed corotating disk apparatus simulating a hard disk drive (HDD) using the particle image velocimetry technique. The geometrical dimensions of the components in the apparatus test section were scaled up by a factor of two, approximately, relative to those of a nominal 312 inch HDD. Most of the measurements were obtained on the interdisk midplane for two angular orientations of the arm/SSUs: (a) One with the tip of the SSUs near the hub supporting the disks; (b) another with the tip of the SSUs near the rims of the disks. Data obtained for disk rotational speeds ranging from 250 to 3000rpm (corresponding to 1250 to 15,000rpm, approximately, in a 312 inch HDD) were post-processed to yield mean and rms values of the two velocity components and of the associated shear stress, the mean axial vorticity, and the turbulence intensity (based on the two velocity components). At the locations investigated near the arm/SSUs, and for disk rotational speeds larger than 1500rpm, the mean velocity components are found to be asymptotically independent of disk speed of rotation but their rms values appear to still be changing. At two locations 90 and 29deg, respectively, upstream of the arm/SSUs, the flow approaching this obstruction displays features that can be attributed to the three-dimensional wake generated by the obstruction. Also, between these two locations and depending on the angular orientation of the arm/SSUs, the effect of the obstruction is to induce a three-dimensional region of flow reversal adjacent to the hub. Notwithstanding, the characteristics of the flow immediately upstream and downstream of the arm/SSUs appear to be determined by local flow-structure interactions. Aside from their intrinsic fundamental value, the data serve to guide and test the development of turbulence models and numerical calculation procedures for predicting this complex class of confined rotating flows, and to inform the improved design of HDDs.

Effects of Screw Fastening Sequence to Top Cover Loosening in Hard Disk Drive Assembly

2011 ◽  
Vol 110-116 ◽  
pp. 3534-3540 ◽  
Author(s):  
Kampol Suknikhom ◽  
Pattaramon Jongpradist ◽  
Surachate Chutima ◽  
Thoatsanope Kamnerdtong
Keyword(s):  
Hard Disk Drive ◽  
Three Dimensional ◽  
Hard Disk ◽  
Disk Drive ◽  
Contact Forces ◽  
The Other ◽  
Screw Loosening ◽  
Element Analysis ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

In hard disk drive assembly process, a number of small screws around the perimeter of the top cover are used to attach the top cover to the base. When one of the screws is fastened, screw loosening at the other screw heads can frequently be observed. . This research employs a three-dimensional finite element analysis to compare the effects of three different screw tightening sequences to top cover loosening in a 3.5-inch hard disk drive assembly. The top cover deformation and the contact forces at the screw heads of the three sequences are presented and discussed. Among the three sequences, the across pattern has shown to be the most appropriate sequence in which a minimum screw loosening occurs.

Hard disk drive failure prediction using SMART attribute

2021 ◽  
Author(s):  
Vikas Tomer ◽  
Vedna Sharma ◽  
Sonali Gupta ◽  
Devesh Pratap Singh
Keyword(s):  
Hard Disk Drive ◽  
Failure Prediction ◽  
Hard Disk ◽  
Disk Drive
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