Patent
Repeatable runout compensation using a learning algorithm with scheduled parameters
YangQuan Chen,LeeLing Tan,KianKeong Ooi,Qiang Bi,Kokhiang Cheong +4 more
- 21 Jan 2000
61
TL;DR: In this paper, a method and apparatus for compensating for written-in repeatable runout in a disc drive is provided, where compensation values are determined through an iterative learning process in which parameters of the learning process such as learning gain, servo loop gain, etc. are functions of the iteration number.
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Abstract: A method and apparatus for compensating for written-in repeatable runout in a disc drive is provided. Compensation values are determined through an iterative learning process in which parameters of the learning process such as learning gain, servo loop gain, etc. are functions of the iteration number. The learning process also employs a nominal double integrator model of an actuator of the disc storage system. The learning process is also a function of a zero-phase low-pass filter.
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Citations
Iterative Learning Control: Brief Survey and Categorization
Hyo-Sung Ahn,YangQuan Chen,Kevin L. Moore +2 more
- 01 Nov 2007
TL;DR: The iterative learning control (ILC) literature published between 1998 and 2004 is categorized and discussed, extending the earlier reviews presented by two of the authors.
1.6K
Iterative learning control and repetitive control in hard disk drive industry—A tutorial
TL;DR: In this article, a tutorial on iterative learning control (ILC) and repetitive control (RC) techniques in hard disk drive (HDD) industry for compensation of repeatable runouts (RRO) is presented.
151
Iterative Learning Control and Repetitive Control in Hard Disk Drive Industry - A Tutorial
YangQuan Chen,Kevin L. Moore,Jie Yu,Tao Zhang +3 more
- 01 Dec 2006
TL;DR: This paper presents a tutorial on iterative learning control (ILC) and repetitive control (RC) techniques in hard disk drive (HDD) industry for compensation of repeatable runouts (RRO).
143
Patent
Method for recursively determining repeatable runout cancellation values in a magnetic disk drive
Hemant Melkote,Russ A. Quisenberry +1 more
- 30 Sep 2002
TL;DR: In this paper, a method for recursively determining repeatable runout (RRO) cancellation values in a disk drive having a head disk assembly (HDA) and a sampled servo controller is disclosed.
128
Patent
Method for improved repeatable run out learning in a disk drive
Zhi Wang,Hien T. Chu,Jenghung Chen +2 more
- 31 Oct 2006
TL;DR: In this paper, a method for determining fundamental-frequency repeatable runout (1FRRO) coefficients in a disk drive is presented. But the method is restricted to the case where the transducer head is caused to move in a substantially constant velocity motion across a selected portion of the tracks of the rotating magnetic disk in response to a control signal.
110
References
Patent
Utilization of stored run-out information in a track following servo system
James O. Jacques,Martin O. Halfhill +1 more
- 02 Nov 1976
TL;DR: In this paper, a servo system including a recording head to sense servo data on a disk track and an external transducer for generating signals representing the coarse position of the head is described.
96
Patent
Embedded servo track following system and method for writing servo tracks
Theodore A. Oliver,David L. Nelson,Keat-Lye Chan +2 more
- 30 Nov 1982
TL;DR: In this paper, a servo track following system for positioning a moving read/write head relative to a magnetic storage disc is described, where a plurality of servo tracks are recorded in sectors on the disc for identifying radial positions or informational tracks.
96
Patent
A disk file servo control system with fast reduction of repeatable head position error
Michael L. Workman
- 16 Jul 1985
TL;DR: In this article, an improvement to a disk file servo control system removes repeatable error from the read/write head position error signal (PES) during track following, where a table of values of a sine function having a frequency equal to the disk rotational frequency is stored in a memory device.
88
Patent
Adaptive control technique for a dynamic system
Michael Charles Stich,John Boris Resman,Hjalmar Holmboe Ottesen,Todd Barry Anderson +3 more
- 09 Jun 1986
TL;DR: A controller for a voice coil motor driven disk file actuator is described in this paper, which has an online adjustable gain characteristic for controlling movement of the actuator assembly and an estimator that estimates actuator velocity and bias.
85
Patent
Digital sector servo incorporating repeatable run out tracking
Ich Van Pham
- 22 Jun 1994
TL;DR: In this article, a digital servo control system for controlling a disk file head includes a main control loop at least one head for reading servo information; a voice coil motor (VCM) attached to the head for positioning the head relative to the target track centerline of a track in response to a VCM control signal; means for deriving from the servos information a digital head position error signal (PES); and a processor employing an estimator model for estimating parameters of the VCM and for generating from the estimated parameters and the digital VCM controller signal.
84