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Narrowband Performance of Active Control on Flow-Induced Vibrations Inside Hard Disk Drives

[+] Author Affiliations
Hequn Min, Xiaoyang Huang, Xin Xia

Nanyang Technological University, Singapore

Qide Zhang

Data Storage Institute, Singapore

Paper No. ISPS2013-2810, pp. V001T04A002; 4 pages
doi:10.1115/ISPS2013-2810
From:
  • ASME 2013 Conference on Information Storage and Processing Systems
  • ASME 2013 Conference on Information Storage and Processing Systems
  • Santa Clara, California, USA, June 24–25, 2013
  • Conference Sponsors: Information Storage and Processing Systems Division
  • ISBN: 978-0-7918-5553-9
  • Copyright © 2013 by ASME

abstract

This paper presents an experimental study of digital narrowband active control on the flow-induced vibrations (FIV) on the head gimbals assembly (HGA) in a working hard disk drive (HDD). Firstly, the modal testing on the HDD was carried out, in which the disk modes were analyzed with a 1-D laser Doppler vibrometer (LDV) and the HGA vibration modes with a 3-D LDV. Secondly, a digital feedback control close-loop was implemented in experiments to suppress the FIV spectrum peaks on the HGA. In this close-loop, the HGA vibrations detected by the LDV were used as feedback error signals, then the signals was passed through a digital controller to generate feedback signals to drive a piezoelectric disk to actuate feedback acoustic pressure around the HGA. Active control experiments were conducted in narrow bands on five principal peaks in the HGA off-plate vibration spectrum, around 1256Hz, 1428Hz, 2141Hz, 2519Hz and 3469Hz, respectively. It is shown that distinct suppression of at least 10 dB can be achieved on all these HGA vibration peaks.

Copyright © 2013 by ASME

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