Eigenvalue and Frequency Response Analyses of a Hard Disk Drive Actuator Using Reduced Finite Element Models

2007 ◽  
Vol 31 (5) ◽  
pp. 541-549 ◽  
Author(s):  
Jeong-Sam Han
Keyword(s):  
Finite Element ◽  
Frequency Response ◽  
Hard Disk Drive ◽  
Hard Disk ◽  
Disk Drive ◽  
Finite Element Models

SHOCK RESPONSE OF THE CLAMPED DISK IN SMALL FORM FACTOR HARD DISK DRIVE

2008 ◽  
Vol 22 (09n11) ◽  
pp. 1592-1597 ◽  
Author(s):  
BIN GU ◽  
DONGWEI SHU ◽  
BAOJUN SHI ◽  
GUOXING LU
Keyword(s):  
Finite Element ◽  
Form Factor ◽  
Hard Disk Drive ◽  
Hard Disk Drives ◽  
Hard Disk ◽  
Disk Drive ◽  
Element Model ◽  
Small Form ◽  
Shock Response ◽  
Small Form Factor

As small form factor (one-inch and smaller) hard disk drives are widely used in portable consumer appliances and gadgets, their mechanical robustness is of greater concern. In the previous work, it is found that when the disk is more tightly clamped, it helps to decrease the shock response of the disk and then avoid the head slap. In this paper, the real boundary condition of the disk for a small form factor hard disk drive from Seagate is investigated numerically. The disk is clamped between the clamp and the hub. The shock response of the disk under a half-sine acceleration pulse is simulated by using the finite element method. In the finite element model, both contact between disk and clamp and contact between disk and hub are considered. According to the simulation results, how to decrease the shock response of the disk is suggested.

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.

Design of a Collocated Dual Stage Suspension in a Hard Disk Drive

2014 ◽  
Author(s):  
Longqiu Li ◽  
Karcher Morris ◽  
John Hogan ◽  
Frank E. Talke
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Hard Disk Drive ◽  
Hard Disk ◽  
Disk Drive ◽  
Element Analysis ◽  
Lateral Deflection ◽  
Dual Stage ◽  
Dual Stage Actuator

The design of a collocated head-based dual stage actuator is investigated using finite element analysis. The effect of gimbal design dimensions on the lateral deflection is evaluated. Comparison of the present dual stage head-based actuator is made with other suspension-based designs and the collocated design proposed by Lengert et al [1].

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