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Title of Journal: Microsyst Technol

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Abbravation: Microsystem Technologies

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Springer-Verlag

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DOI

10.1007/s10103-008-0576-9

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1432-1858

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Excitation pulse shape effects in drop test simula

Authors: B J Shi S Wang D W Shu J Luo H Meng Q Y Ng R Zambri
Publish Date: 2005/11/22
Volume: 12, Issue: 4, Pages: 299-305
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Abstract

For a head actuator assembly HAA of a hard disk drive the deflection of the tip of the arm relative to the pivot can be used as an indicator of its response to shock To study the pulse shape effects in a shock analysis the actuator arm of an HAA subjected to different acceleration pulse shapes such as halfsine triangular and dualquadratic was simulated by using a dynamic finite element package It has been found that for the three acceleration pulses the peak displacements have opposite behaviors for 01 and 1ms pulse widths The above phenomena have been explained in terms of a power spectrum analysis It has been found that the relative magnitude of the peak displacement of the actuator arm is mainly determined by the power magnitude of the acceleration pulse at the resonant frequency A simple mathematical theory was developed to predict the location of a crossover interval which divides the power spectrum curve into two major regions where opposite behaviors are observed The theoretical pulse width is correlated with a pulse width based on a threshold value as normally used in experiments

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