Ramp wear and debris from load/unload lift-tab roughness

Yaeger, J.R.

doi:10.1109/tmag.2002.802695

Cited by 8 publications

(2 citation statements)

References 2 publications

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“…The research of Wang et al indicated that when the system was with a very high unloading velocity, the possibility of occurrence of air bearing breaking might increase while the unloading distance might increase with increase of rotating velocity of suspension [6]. Yeager supposed that the wear at the ramp surface would induce more particles at the interface and accumulate in the drive [7]. Those efforts have been focused on dynamic behavior at the slider head and disk interface, in which a few of them were concerned with the design of ramp profile and the selection of ramp materials.…”

Section: Introductionmentioning

confidence: 99%

Simulation of Head-Disk Interface and Ramp/Lift-Tab Interfaces During Load/Unload Process of Hard Disk Drive

Wei

Jiang

2010

JAMDSM

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A 2-D dynamic model was proposed to describe the dynamic behavior of the ramp/lift-tab interface of a one-inch hard disk drive with consideration of the air bearing force and contact stages during the unloading process. The contribution of the geometric parameters of the ramp/lift-tab interface on the dynamic performance of the suspension lift-tab was studied through simulation. A modified Reynolds equation and an iterative formulation for numerical scheme were presented considering continuum Poiseuille flows. The dynamic model developed for the lift-tab motion was extended to simulate the contact and separation stages of head-disk interface. The contact forces and deformation at the ramp/lift-tab contact interface were calculated. The effect of the horizontal velocity of the suspension lift-tab on the dynamic performance of the slider was analyzed. The results show that the dynamic characteristics of slider were independent on the geometric parameters of the ramp and the velocity of the suspension lift-tab. The calculation method to solve the Reynolds Equation proposed in the paper is with enough precision and high efficiency.

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Section: Introductionmentioning

confidence: 99%

Simulation of Head-Disk Interface and Ramp/Lift-Tab Interfaces During Load/Unload Process of Hard Disk Drive

Wei

Jiang

2010

JAMDSM

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“…In the experiments conducted by Yaeger (2002), the wear at the ramp surface during loading and unloading processes was observed in situ, and debris generation for a polyoxymethylene (POM) ramp was measured. The results indicated that the wear of the ramp surface caused a high level of particle generation, with the particles being subsequently accumulated inside the drive.…”

Section: Introductionmentioning

confidence: 99%

Shock effects on the performance of the interface between the moving suspension lift-tab and the ramp in a load/unload drive

Shao

et al. 2009

Microsyst Technol

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The bouncing behavior of the suspension lifttab at the tab-ramp interface during the unloading process of a hard disk drive subject to external shocks was studied by using a lumped-parameter dynamic model with one degree of freedom in a moving reference frame. A finite element model of the hard disk drive was used to generate the data as input to the lumped-parameter model. This simulation scheme allows easy examination of the effects of individual contributing factors. The effects of the peak acceleration of the external shock pulse, the pivot hub motion, the air bearing suction force and the disk motion on the bouncing characteristics of the lift-tab were studied by evaluating the bouncing distance and bouncing height of the lift-tab as well as the indentation depth at the tab-ramp interface. The simulation results indicate a different behavior of the suspension close to the base plate (B) compared to that close to the cover (C). The bouncing distance and bouncing height were larger for Suspension C compared to Suspension B. For the latter, the motion of the pivot hub is an important contributing factor to the bouncing distance and bouncing height. Moreover, the indentation depth increases significantly with increasing peak acceleration. For suspension C, both the bouncing distance and the bouncing height increase almost linearly with increasing peak acceleration. The vibration of the disk changes the dimple separation height and the air bearing force during an unloading process, thus affecting the bouncing behavior of the lift-tab. The effect of the suction force on the bouncing of the lift-tab is coupled with the disk position. When the lift-tab exceeds the dimple separation height for a disk raised relative to its original position, the suction force can decrease the bouncing height of the lift-tab significantly, compared to the condition without a suction force.

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