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Self-sensing actuation for improved audio-induced vibration rejection in dual-stage hard disk drives

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Abstract

In this paper, a general circuit topology of enhanced indirect-driven self-sensing actuation (EIDSSA) is proposed to allow independent design of actuation and self-sensing in piezoelectric-actuated systems. Sensitivity analysis is performed in terms of suspension structural dynamics, geometric amplification and material property. The proposed EIDSSA circuit topology is realized and incorporated into a commercial dual-stage hard disk drive to improve the rejection capability of audio-induced vibrations. Experimental results show that the on-track total-runout has been reduced by 8.89% in pink noise audio-induced vibrations and 25.2% in single-tone 2.5 kHz audio-induced vibrations without additional loop tuning efforts.

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Authors and Affiliations

  1. Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore, 117583, Singapore

    Bin Hu & Chee Khiang Pang

  2. Singapore HDD R&D Centre, Western Digital Corporation, 89, Science Park Drive, Singapore Science Park 1, Singapore, 118261, Singapore

    Bin Hu & Jie Wan

  3. Engineering Cluster, Singapore Institute of Technology, 20 Dover Drive, Singapore, 138682, Singapore

    Chee Khiang Pang

Authors
  1. Bin Hu
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  2. Jie Wan
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  3. Chee Khiang Pang
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Correspondence to Chee Khiang Pang.

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Hu, B., Wan, J. & Pang, C.K. Self-sensing actuation for improved audio-induced vibration rejection in dual-stage hard disk drives. Microsyst Technol 23, 5203–5210 (2017). https://doi.org/10.1007/s00542-016-3218-3

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  • DOI: https://doi.org/10.1007/s00542-016-3218-3

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