A parametric study on rocking vibration of hard disk drive spindle motors with fluid-dynamic bearings and rotating-shaft design

2005 ◽  
Vol 11 (11) ◽  
pp. 1204-1213 ◽  
Author(s):  
Baekho Heo ◽  
I. Y. Shen
Keyword(s):  
Hard Disk Drive ◽  
Parametric Study ◽  
Fluid Dynamic ◽  
Hard Disk ◽  
Disk Drive ◽  
Rotating Shaft ◽  
Rocking Vibration

Vibration Characteristics of a Rotor-Flexible Disk System: In Case of HDD Spindle-Motor System

1999 ◽  
Author(s):  
D. C. Han ◽  
S. H. Choi ◽  
K. B. Park ◽  
S. C. Jung
Keyword(s):  
Hard Disk Drive ◽  
Hard Disk ◽  
Disk Drive ◽  
Spindle Motor ◽  
Vibration Characteristics ◽  
Rotating Shaft ◽  
Disk System ◽  
Assumed Mode Method ◽  
Mode Method ◽  
Flexible Disk

Abstract In this paper we investigate the vibration characteristics of a rotor system with flexible disks. The coupled vibration mode between rotating shaft and the flexible disk are analyzed for lateral and axial vibrations respectively. Gyro and sheer effects are considered for the modeling of lateral vibrations. An assumed mode method was used for the disk modeling considering gyro effects. For a numerical example hard disk drive is considered. The natural frequencies of the motor-spindle system with flexible disk of hard disk drive was calculated and compared to the experimental data.

3221 Characteristics Analysis and Optimum Design of Small Size Thrust Air Bearing for Hard Disk Drive : Parametric Study

2008 ◽  
Vol 2008.4 (0) ◽  
pp. 139-140
Author(s):  
M. Danial Ibrahim ◽  
Tadashi Nanba ◽  
Masayuki Ochiai ◽  
Hiromu Hashimoto
Keyword(s):  
Hard Disk Drive ◽  
Optimum Design ◽  
Parametric Study ◽  
Hard Disk ◽  
Disk Drive ◽  
Air Bearing ◽  
Characteristics Analysis

Finite Element Analysis of the Coupled Journal and Thrust Bearing in a Computer Hard Disk Drive

2005 ◽  
Vol 128 (2) ◽  
pp. 335-340 ◽  
Author(s):  
G. H. Jang ◽  
S. H. Lee ◽  
H. W. Kim
Keyword(s):  
Finite Element ◽  
Hard Disk Drive ◽  
Thrust Bearing ◽  
Fluid Dynamic ◽  
Hard Disk ◽  
Disk Drive ◽  
Flying Height ◽  
Separate Analysis ◽  
Element Analysis ◽  
Thrust Bearings

This paper proposes a method to calculate the characteristics of a coupled fluid dynamic journal and thrust bearing of a hard disk drive (HDD) spindle motor. The governing equations for the journal and thrust bearings are the two-dimensional Reynolds equations in the θz and rθ planes, respectively. The finite element method is appropriately applied to analyze the coupled bearing under the conditions of the continuity of mass and pressure at the interface between the journal and thrust bearings. The pressure in the coupled bearing was calculated by applying the Reynolds boundary condition. The validity of this application was verified by comparing the analytical results of the flying height at various rotating speeds with experimental results. The characteristics of the coupled journal and thrust bearing were also investigated due to the Reynolds and Half-Sommerfeld boundary conditions and the coupled and separate analysis. This research demonstrates that the proposed method can accurately and realistically describe the coupled fluid dynamic bearing in a HDD system.

Reduction in Adsorption of Bearing Oil From Fluid Dynamic Bearings of Hard Disk Drive Spindle Motor by Diamagnetism

2012 ◽  
Vol 48 (11) ◽  
pp. 4152-4155 ◽  
Author(s):  
Hiroshi Tani ◽  
Ryosuke Habara ◽  
Norio Tagawa
Keyword(s):  
Hard Disk Drive ◽  
Fluid Dynamic ◽  
Hard Disk ◽  
Disk Drive ◽  
Spindle Motor

Dynamic behavior of air–oil interface in fluid dynamic bearings with a double sealing structure in a 2.5′′ hard disk drive due to non-operating axial shock

2016 ◽  
Vol 98 ◽  
pp. 306-316 ◽  
Author(s):  
Chiho Kang ◽  
Yeonha Jung ◽  
Jihoon Lee ◽  
Minho Lee ◽  
Bumcho Kim ◽  
...  
Keyword(s):  
Dynamic Behavior ◽  
Hard Disk Drive ◽  
Fluid Dynamic ◽  
Hard Disk ◽  
Disk Drive

Decreasing Airflow Velocity in High Speed Hard Disk Drive by Using Spoiler

2014 ◽  
Vol 1061-1062 ◽  
pp. 862-865 ◽  
Author(s):  
Waranya Kankaew ◽  
Kiatfa Tangchaichit ◽  
Jarupol Suriyawanakul
Keyword(s):  
Hard Disk Drive ◽  
Computational Fluid Dynamic ◽  
Rotational Speed ◽  
High Speed ◽  
Fluid Dynamic ◽  
Hard Disk ◽  
Disk Drive ◽  
Airflow Velocity ◽  
Commercial Software ◽  
Airflow Simulation

This research aims at presenting the airflow simulation within the high speed Hard Disk Drive by installing the device called Spoiler which helps to reduce the airflow velocity before colliding with the read/write head. Due to the high speed airflow within the hard disk drive, it directly impacts on the vibration of the read/write arm and consequently causing the damage and inaccuracy function of the read/write head. The rotational speed of the platter is specified at 20,000 rpm (round per minute). According to this study, the length of Spoiler is divided into 4 values which are 15, 20, 25 and 30 millimeters respectively. Thereafter, apply each length of the Spoiler to the commercial software called Computational Fluid Dynamic (CFD) by using K-epsilon model. The result shows that the length of Spoiler at 30 millimeters can reduce the average airflow velocity by 57.18%.

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