Abstract
This paper proposes a head-positioning controller design for hard disk drives using multirate sampled-data H∞ control theory. Two types of upsampling-by-2 controllers have been derived by solving a mixed sensitivity problem, one is with exogenous inputs at the plant input side (Type A) and the other is with those at the plant output side (Type B). The controlled plant used here has a mechanical resonance at a higher frequency than the Nyquist frequency of a sampling frequency of the controlled output. As a result, it has been confirmed that Type A controllers are robust against aliasing of the resonance and that Type B controllers, which have the same features as conventional digital controllers using analog notch (band-eliminated) filters, attains a wider control bandwidth than that of Type A. Although the control system is affected by the resonance aliasing, a Type B controller has achieved higher positioning accuracy than that of Type A in a benchmark simulation of a hard disk drive with dual-stage servo mechanism.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series C
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
