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.
read more
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.
read more
Chat with Paper
AI Agents for this Paper
Find similar papers on Google Scholar, PubMed and Arxiv
Write a critical review of this paper
Analyze citations of this paper to find unaddressed research gaps
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
Automatic servo control gain compensation technique for hard disk drive
Gwan-Il Kim
- 26 Nov 1996
TL;DR: An automatic servo control gain compensation technique for a hard disk drive for minimizing the deterioration of the performance of a control system, while designing the control system to have a compensation adaptive capacity for variations of external variables includes: (a) receiving an input of a seek command, inputting a position signal varied according to movement of a head, and finally obtaining a current position and a current velocity by calibration, as mentioned in this paper.
15
Patent
Index servo type magnetic head positioning control apparatus and method thereof
Kitamura Shunji
- 26 Jun 1986
TL;DR: In this paper, a magnetic head positioning control apparatus using an index servo data has a circuit for determining a final correction value such that a magnetic position correcting operation is repeatedly performed at a designated track position.
15
Patent
Tracking servo system with a variable equalizing characteristic
Kiyoshi Tateishi,Haruyasu Sakata +1 more
- 07 Apr 1989
TL;DR: A tracking servo system for use in a disc player having a pickup, for playing an information recording disc having a recording track, is described in this paper, where the system comprises an equalizing circuit for compensating for the frequency characteristic of the tracking error signal for the servo operation, the circuit means performing a compensating operation in accordance with a predetermined compensation characteristic during a normal playback of the recording disc.
15
Patent
Method and apparatus for writing servo tracks of a magnetic disk unit which uses a probe to control the positioning of the head
Hien Dang,Nakagawa Takahiro,Nakamoto Yoshiyasu,Muthuthamby Sri-Jayantha,Hiroyuki Suzuki +4 more
- 28 Feb 1996
TL;DR: In this article, the authors present a method and apparatus for writing servo tracks of a magnetic disk unit, which can reduce a mechanical vibration of a head in the steady state and can shorten a settling time of the system.
14
Patent
Off-track bit shift compensation apparatus
Harlan P. Mathews
- 26 May 1988
TL;DR: In this paper, the analog detection threshold of the read apparatus is dynamically adjusted to make the data bit written on the data storage track appear longer, which results in bit shift and increased error rate.
14