A Simulation Scheme with Coupled Dynamic Models for the Slider and the Suspension Lift-Tab during the Unloading Process of a Hard Disk Drive

Shao, Wei; Yuan, Yanhui; Ao, Hongrui; Liu, Yan

doi:10.1080/10402000903350604

Cited by 3 publications

(7 citation statements)

References 25 publications

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“…The parameters determined and specified for the present analysis are listed in Table 1. The damping coefficient for the ramp material is close to that used by Wang et al (2009), who related it via analytical derivation to the lower range of the restitution coefficient for bouncing objects observed experimentally (Cross 1999). The assumed constant lateral unloading velocity is on the higher side of an experimental range (Wang et al 2003).…”

Section: Dynamic Model Involving the Inertial Forcementioning

confidence: 93%

“…Note that [k] is the inverse matrix of the suspension stiffness matrix (Wang et al 2009). The upward direction is taken as positive for all the forces and displacements in Eq.…”

Section: Consideration Of the Air Bearing Force And Disk Motionmentioning

confidence: 99%

“…where z is the vertical position of the center of the effective mass m s , k s is the stiffness of the suspension (obtained from a finite element model), c s and c r are the damping coefficients for the suspension lift-tab and the tab-ramp contact, respectively, z 0 is the free-state position of the lift-tab, z e is an equivalent lift-tab displacement for considering the effect of the air bearing force (to be discussed later), k r is the contact stiffness of the elliptical Hertzian contact at the tab-ramp interface (Wang et al 2009), F I is the inertial force due to the acceleration pulse, equal to -m s a h (t), a h (t) is the acceleration of the ramp holder, and z r and v r are the height and vertical velocity of the ramp surface under the lift-tab, respectively. For a ramp angle h, v r is related to the lateral unloading velocity of the lift-tab, v x , by v r = v x tanh for the inclined portion of the ramp, and z r can be obtained by integrating v r for the time elapsed.…”

Section: Dynamic Model Involving the Inertial Forcementioning

confidence: 99%

“…Although the air bearing force is not directly applied to the lift-tab, it can be converted to an equivalent effect on the lift-tab by considering the head-arm assembly as an elastically deformable structure (a generalized beam). The vertical displacement of the lift-tab, z, and the vertical displacement of the slider, z s , are related to the vertical ramp force exerted on the lift-tab, F r , and the air bearing force exerted on the slider, F s , through a flexibility matrix for the suspension [k], as follows (Wang et al 2009). …”

Section: Consideration Of the Air Bearing Force And Disk Motionmentioning

confidence: 99%

“…The lateral velocity of the suspension was found to be critical to the bouncing behavior of the lift-tab. Wang et al (2009) expanded that model and developed a numerical scheme with coupled SDOF and 2-DOF models to study the bouncing and indentation of the lift-tab with consideration of the influence of the slider vibration.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Dynamic Model Involving the Inertial Forcementioning

confidence: 93%

“…Note that [k] is the inverse matrix of the suspension stiffness matrix (Wang et al 2009). The upward direction is taken as positive for all the forces and displacements in Eq.…”

Section: Consideration Of the Air Bearing Force And Disk Motionmentioning

confidence: 99%

Section: Dynamic Model Involving the Inertial Forcementioning

confidence: 99%

Section: Consideration Of the Air Bearing Force And Disk Motionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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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Simulation of Lift Tab/Ramp Contact During Load/Unload

Morris

Talke

2017

IEEE Trans. Magn.

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Tribological behaviours of Ti₃SiC₂under current carrying conditions

Xiao

2014

Advances in Applied Ceramics

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High purity Ti 3 SiC 2 samples were prepared by infiltration sintering method. The tribological behaviours of high pure bulk Ti 3 SiC 2 dry sliding against a GCr15 bearing steel disc were experimentally investigated on a pin on disc type tester under different sliding speeds from 5 to 50 m s 21 , different electric currents from 0 to 60 A and different normal pressures from 0?1 to 0?6 MPa. It was found that the Ti 3 SiC 2 sample exhibits an increasing friction coefficient (0?15-0?71) and an increasing wear rate (0?91-4?69610 26 mm 3 N 21 m 21 ) with the electric current increasing from 0 to 60 A; the normal pressure (0?1-0?6 MPa) and the sliding speed (5-50 m s 21 ) also have a complex but relatively weak influence on them. The changes can be attributed to the presence of a frictional oxide film consisting of an amorphous mixture of Si, Ti and Fe oxides on the friction surface. The oxide film was formed, and the percentage of coverage was relatively higher when the electric current was 0 A. The oxide film could be formed, but the percentage of coverage was decreased with the increase in electric current. Few of the oxides were generated, and almost no oxide film was formed in the friction surface when the electric current was 60 A. The frictional coefficient and the wear rate of Ti 3 SiC 2 increased with increasing electric current. The coefficient of friction and the wear rate (610 26 mm 3 N 21 m 21 ) of Ti 3 SiC 2 were of 0?15 and 1?73, 0?25 and 2?52, 0?42 and 3?35 and 0?62 and 4?69 under the normal pressure of 0?3 MPa, the sliding speed of 50 m s 21 and the electric currents of 0, 20, 40 and 60 A respectively.

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A Simulation Scheme with Coupled Dynamic Models for the Slider and the Suspension Lift-Tab during the Unloading Process of a Hard Disk Drive

Cited by 3 publications

References 25 publications

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

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

Simulation of Lift Tab/Ramp Contact During Load/Unload

Tribological behaviours of Ti₃SiC₂under current carrying conditions

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A Simulation Scheme with Coupled Dynamic Models for the Slider and the Suspension Lift-Tab during the Unloading Process of a Hard Disk Drive

Cited by 3 publications

References 25 publications

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

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

Simulation of Lift Tab/Ramp Contact During Load/Unload

Tribological behaviours of Ti3SiC2under current carrying conditions

Contact Info

Product

Resources

About

Tribological behaviours of Ti₃SiC₂under current carrying conditions