Optimization and Systems Theory Seminar
Friday, October 14, 2005, 11.00-12.00, Room 3721, Lindstedtsvägen 25

Ryozo Nagamune
Division of Optimization and Systems Theory
Department of Mathematics
E-mail: ryozo@math.kth.se

Robust track-following control for dual-stage servo systems in hard disk drives

Abstract. Dual-stage servo control is expected to be important for high precision track-following of the magnetic read/write head in hard disk drives. In this talk, for a general dual-stage multi-sensing system, multirate robust track-following control synthesis techniques are presented. The system to be considered includes both parametric and dynamic uncertainties, representing plant variations which occur in batch fabrication. For such uncertain system, a track-following control problem is formulated as an optimization problem of worst-case H2 performance. To solve the optimization problem, three LMI-based controller design techniques are presented, that are, mixed H2/H-infinity, mixed H2/mu, and robust H2 syntheses. Realistic examples are given to illustrate the usefulness of the proposed techniques for maintaining track-following property even under plant perturbations.
Calendar of seminars
by Anders Forsgren.