NDLI: Output feedback control for disk drive commutational ramp loading

Content Provider	IEEE Xplore Digital Library
Author	Ratliff, R.T. Pagilla, P.R.
Copyright Year	2006
Description	Author affiliation: Boeing Co., St. Louis, MO (Ratliff, R.T.)
Abstract	An output feedback controller for a commutational ramp load disk drive actuator is investigated. The controller eliminates the necessity of increased material requirements common in ramp load disk drives. Therefore, disk drives with lower cost, higher performance actuators can realize the linear shock protection benefits of ramp loading. While on the ramp, there exists a set in the state space where the actuator dynamics are uncontrollable. An input commutation is required within the uncontrollable region to sustain the direction of actuator motion. Additionally, the motor torque factor, magnetic restoration bias, and friction torque are nonlinear and can be represented by functions that are Lipschitz within the actuator ramp angle. Position and velocity information are not available while the actuator maneuvers along the ramp. An exponentially stable controller, using only current feedback, is designed to track a predetermined reference trajectory and move the actuator through the uncontrollable set for a successful load onto the disk at the desired load velocity. Experiments are performed to verify the efficacy of the output feedback control law
Sponsorship	American Automatic Control Council IFAC
File Size	1013539
File Format	PDF
ISBN	1424402093
e-ISBN	1424402107
DOI	10.1109/ACC.2006.1656513
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-06-14
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	American Automatic Control Council(AACC)
Subject Keyword	Output feedback Disk drives Commutation Torque Costs Hydraulic actuators Electric shock Protection State-space methods Friction
Content Type	Text
Resource Type	Article

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