Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1996-03-04
1997-09-16
Psitos, Aristotelis M.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 7809, G11B 5596
Patent
active
056686803
ABSTRACT:
A method for optimizing the demand velocities in a disc drive velocity profile using both time and vibro-acoustic constraints. An accurate, high-order dynamic model of the disc drive is formulated which describes the vibro-acoustic output of the drive in response to actuator coil current input, taking into account the disc drive actuator structure and the electrical response of the disc drive servo circuit. From this dynamic model, the shortest possible seek time is determined for a selected seek length which can achieve a vibro-acoustic output below a selected, maximum limit, as well as settling within a specified tolerance of the target track. Once the shortest possible seek time is determined, the demand velocity values in the velocity profile are selected so as to minimize the maximum position error during the seek settle. The demand velocity values are subsequently provided in a look up table for use during a seek by the disc drive servo circuit.
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patent: 5262907 (1993-11-01), Duffy et al.
patent: 5282100 (1994-01-01), Tacklind et al.
patent: 5465034 (1995-11-01), Andrews, Jr. et al.
patent: 5475545 (1995-12-01), Hampshire et al.
patent: 5566095 (1996-10-01), Cameron et al.
Text by Franklin, Powell & Workman, "Digital Control of Dynamic Systems", Addison-Wesley Publishing Co., Second Edition, 1990, pp. 250-280, pp. 257-260; pp. 265-267; pp. 272-280.
Article by Katoh, "Vibrationless Seeking Control Using Slew-Rate Limit for Disk Drives", 2nd International Conference on Motion and Vibration Control, Yokohama, Japan Sep. 1994, pp. 728-732.
Text by Bryson & Ho, "Applied Optimal Control", Hemisphere Publishing, 9th Edition, 1975, pp. 45-136; of particular interest -pp. 131-135.
Technical Report No. 90-16 by Min & Bhat, "Residual-Vibrationless Track Accessing Control for Computer Rigid Disk Drives Using Laplace Transform Technique", UCLA School of Mechanical Engineering Oct., 1990; pp. 5-9.
Habermehl James L.
Heller III Edward P.
McCarthy Bill D.
McCarthy Randall K.
Psitos Aristotelis M.
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