NDLI: Shock analysis of non-operating hard disk drives based on a multibody dynamic formulation

Content Provider	Springer Nature Link
Author	Gao, Feng Yap, Fook Fah Yan, Ying Harmoko, Hendri
Copyright Year	2005
Abstract	Dropping, striking, or bouncing a hard disk drive (HDD) against a hard surface can damage it internally without external evidence of damage. Contact with a hard ground will lift the slider off the disk surface and then slap back on the surface. A drive that is subjected to this type of shock may fail on initial use or the reliability of the drive may degrade over time. Therefore, industry has a lot of interest on the shock conditions that cause a slider to lift off the disk surface. Finite element software such as ANSYS/LS-DYNA is often used to analyze this shock problem. However, this method consumes a great amount of time. It is also difficult to perform design parameter studies because it requires re-analysis of the model of the entire HDD system when certain design variables are changed. This paper presents a flexible multi-body dynamics formulation to analyze the shock problem of non-operating HDDs. Governing equations of motion of the voice coil motor (VCM)–actuators assembly and the disks–spindle system are derived using a Lagrangian formulation. By introducing constraint equations between the slider and the disk surface, the shock response of the whole HDD system has been obtained. Numerical results show that the method is reasonable and the acceleration amplitude which makes the slider lift off can be determined in a significantly shorter time than by the conventional approach. Finally, the effect of drive parameters on shock resistance, such as shock duration and slider resting location are analyzed.
Starting Page	247
Ending Page	257
Page Count	11
File Format	PDF
ISSN	09467076
Journal	Microsystem Technologies
Volume Number	12
Issue Number	3
e-ISSN	14321858
Language	English
Publisher	Springer-Verlag
Publisher Date	2005-10-25
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Operating Procedures, Materials Treatment Mechanical Engineering Nanotechnology Electronics and Microelectronics, Instrumentation
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering Hardware and Architecture

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