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中南大学学报(英文版)

Journal of Central South University

Vol. 24    No. 4    April 2017

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Optimization of passive control performance for different hard disk drives subjected to shock excitation
Seyed Rashid Alavi1, 2, Mehdi Rahmati1, 2, Saeed Ziaei-Rad1

1. Department of Mechanical Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran;
2. Isfahan Mathematics House, Isfahan 81698-51177, Iran

Abstract:Laptop personal computers (LPCs) and their components are vulnerable devices in harsh mechanical environments. One of the most sensitive components of LPCs is hard disk drive (HDD) which needs to be protected against damages attributable to shock and vibration in order to have better magnetic read/write performance. In the present work, a LPC and its HDD are modeled as two degrees of freedom system and the nonlinear optimization method is employed to perform a passive control through minimizing peak of HDD absolute acceleration caused by a base shock excitation. The presented shock excitation is considered as half-sine pulse of acceleration. In addition, eleven inequality constraints are defined based on geometrical limitations and allowable intervals of lumped modal parameters. The target of the optimization is to reach optimum modal parameters of rubber mounts and rubber feet as design variables and subsequently propose new characteristics of rubber mounts and rubber feet to be manufactured for the HDD protection against shock excitation. The genetic algorithm and the modified constrained steepest descent algorithm are employed in order to solve the nonlinear optimization problem for three widely-used commercial cases of HDD. Finally, the results of both optimization methods are compared to make sure about their accuracy.

 

Key words: hard disk drive; passive control; shock excitation; sequential quadratic programming; genetic algorithm; rubber

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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