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
Digital servo control system for use in disk drives, including sample integrity tester for reducing effects of spurious sampled position values
Ronald James Kadlec,Paul Henry Kelley,Philip Saxton Weilbacher +2 more
- 01 Jun 1995
TL;DR: In this paper, a servo control system provides adaptive compensation for a variety of tracking and seek problems found in disk drives and is ideally implemented in digital form for accuracy, speed and compactness.
47
Patent
Adaptive runout compensation for miniature disk drives
Thomas L. Andrews,Gary E. Counts +1 more
- 24 Sep 1992
TL;DR: In this article, a servo system is used to position an actuator driven read/write head over any one of a number of tracks on the disk, providing on-line real-time compensation for disk runout that occurs during operation of the miniature disk drive.
46
Patent
Magnetic disc storage device with track centering correction
David M. Chick,Kenneth H. Sinden +1 more
- 06 Jul 1977
TL;DR: In this paper, a magnetic disc data storage device using exchangeable magnetic discs for recording data signals is provided and a read-write head is moved to the reference track and as the disc rotates, the position of the head relative to the axis of rotation is sampled.
46
Patent
Method for applying optimal seeking technique to disk file with excessive repeatable runout
Ich Pham,David Drouin,Evelyn Howard +2 more
- 31 May 1996
TL;DR: In this paper, a method for applying an optimal seeking technique to a disk file with excessive repeatable runout is presented. But the running time of the disk drive is not considered.
46
Patent
High-speed two-dimensional electrostatic actuator
Hideki Nihei,Nobuyoshi Tsuboi,Hiroyuki Minemura,Hiroshi Kimura,Shigeki Morinaga +4 more
- 26 Jul 1990
TL;DR: In this paper, a stationary element and a movable element are aligned by facing the stationary surface and the movable surface towards each other such that the electrode lines of such surfaces are aligned.
45