Abstract
The bouncing behavior of the suspension lift-tab 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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References
Albrecht TR, Sai F (1999) Load/unload technology for disk drives. IEEE Trans Magn 35:857–862
Allen AM, Bogy DB (1996) Effects of shock on the head-disk interface. IEEE Trans Magn 32:3717–3719
Ao HR, Wang S, Yuan Y, Liu Y, Ng QY, Gan S, Chai MC (2006) Dynamic simulation of the suspension lift-tab on a ramp during the unloading process of a hard disk drive. In: Proceedings of Asia-Pacific Magnetic Recording Conference DR-07
Cross R (1999) The bounce of a ball. Am J Phys 67:222–227
Gao F, Yap FF, Yan Y (2005) Modeling of hard disk drives for vibration analysis using a flexible multibody dynamics formulation. IEEE Trans Magn 41:744–749
Gu B, Shu DW, Luo J, Shi BJ (2006) FEA simulation of linear and rotary drop test for small form factor HDD. In: Proceedings of IEEE International Conference on Mechatronics and Automation, pp 1264–1268
Harrison JC, Mundt MD (2000) Flying height response to mechanical shock during operation of a magnetic hard disk drive. ASME J Tribol 122:260–263
Ishimaru N (1996) Experimental studies of a head/disk interface subjected to impulsive excitation during nonoperation. ASME J Tribol 118:807–812
Jayson EM, Murphy JM, Smith PW, Talke FE (2002) Shock and head slap simulations of operational and nonoperational hard disk drives. IEEE Trans Magn 38:2150–2152
Jayson EM, Smith PW, Talke FE (2003) Shock modeling of the head-media interface in an operational hard disk drive. IEEE Trans Magn 39:2429–2431
Kouhei T, Yamada T, Kuroba Y, Aruga K (1995) A study of head-disk interface shock resistance. IEEE Trans Magn 31:3006–3008
Kumar S, Khanna VD, Sri-Jayantha M (1994) A study of the head disk interface shock failure mechanism. IEEE Trans Magn 30:4155–4157
Kuwajima H, Kita H, Hashi H, Miyamoto M, Ueno Y, Inagaki T, Matsuoka K (2006) Development of balanced-type high shock suspension for 0.85-in hard disk drive. IEEE Trans Magn 42:255–260
Lee SJ, Hong SK, Lee JM (2001) A study of shock-resistance design of suspension subjected to impulsive excitation. IEEE Trans Magn 37:826–830
Lin CC (2002) Finite element analysis of a computer hard disc drive under shock. ASME J Mech Des 124:121–124
Luo J, Shu DW, Shi BJ, Ng QY, Zambri R, Lau JHT (2006) Study of the shock response of the HDD with ANSYS-LSDYNA. J Magn Magn Mater 303:e57–e61
Sharma S, Virmani M, Geers TL (2007) Direct comparison of computational and experimental head-slap data for a nonoperating hard disk drive. IEEE Trans Magn 43:1093–1100
Shi BJ, Wang S, Shu DW, Luo J, Meng H, Ng QY, Zambri R (2006) Excitation pulse shape effects in drop test simulation of the actuator arm of a hard disk drive. Microsyst Technol 12:299–305
Shi BJ, Shu DW, Wang S, Luo J, Meng H, Ng QY, Lau JHT, Zambri R (2007) Drop test simulation and power spectrum analysis of a head actuator assembly in a hard disk drive. Int J Impact Eng 34:120–133
Tokuyama M, Katou Y, Shimizu J, Hirose S, Kojima Y, Nishida H (1999) Development of shock proof suspension. IEEE Trans Magn 35:2484–2486
Wang S, Komvopoulos K (1997) Friction force, contact resistance and lubricant shear behavior at the magnetic head-disk interface during starting. ASME J Tribol 119:830–839
Wang S, Crimi FP, Blanco RJ (2003) Dynamic behavior of magnetic head sliders and carbon wear in a rampload process. Microsyst Technol 9:266–270
Wang S, Yuan Y, Ao H, Liu Y (2009) A simulation scheme with coupled dynamic models for the slider and the suspension lift-tab during the unloading process of a hard disk drive. Tribol Trans (to appear)
Yaeger JR (2002) Ramp wear and debris from load/unload lift-tab roughness. IEEE Trans Magn 38:2126–2128
Zeng QH, Bogy DB (2002) Numerical simulation of shock response of disk-suspension-slider air bearing systems in hard disk drives. Microsyst Technol 8:289–296
Acknowledgment
The authors are grateful to Dr. Quock Y. Ng, Samuel Gan, Mui Chong Chai for their helpful discussions and to Yan Liu and Yanhui Yuan for their technical support. This study was part of a data storage industry-funded research project.
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Ao, H., Wang, S., Gu, B. et al. Shock effects on the performance of the interface between the moving suspension lift-tab and the ramp in a load/unload drive. Microsyst Technol 15, 1763–1775 (2009). https://doi.org/10.1007/s00542-009-0915-1
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DOI: https://doi.org/10.1007/s00542-009-0915-1