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 with iteration-domain adaptive feedforward compensation
YangQuan Chen,Kevin L. Moore +1 more
- 09 Dec 2003
TL;DR: This paper considers the iteration-wise sinusoidal disturbance with a known period but with unknown amplitude and unknown phase in iterative learning control (ILC) applications and presents an adaptive feedforward compensation (AFC) scheme in the iteration domain to effectively cancel the sinusoid disturbance.
17
An iterative learning controller for reduction of repetitive runout in disk drives
TL;DR: It is shown that the update law to ensure convergent learning is equivalent to stabilization of a multi-input multi-output system using static output feedback.
17
Patent
Servo system with learning function for achieving servo compensation in a disk drive
Tatsuharu Kusumoto
- 03 Sep 2003
TL;DR: In this article, a servo system for head positioning control in a disk drive is described, where a learning operation is performed to calculate a learned value relating to a disk-runout, and servo compensation is used to suppress a disk runout.
15
Patent
Method and apparatus for determining embedded runout correction values
Yu Sun,Lin Guo,Don Brunnett +2 more
- 06 Jan 2003
TL;DR: In this article, a method and apparatus for compensating for nonlinearities due to pivot bearing friction when determining embedded runout correction values during partial self-servo write of a disk drive is disclosed.
15
Patent
Repeated runout position error compensation in a disc drive servo system
Hai T. Ho,Justin Won,Mirmehdi L. Abrishamchian,Gregory Andrew Campbell +3 more
- 08 Jun 2001
TL;DR: In this article, a digital filter is configured to place a notch in an error sensitivity function relating the PES to the repeated runout position error, with the notch being nominally centered at a frequency of rotation of the recording surface.
14
References
Patent
Digital servo control system for use in disk drives
Ronald James Kadlec,Thomas James Frederick,Paul Henry Kelley,Philip Saxton Weilbacher +3 more
- 17 Sep 1991
TL;DR: In this article, 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.
211
Patent
Repeatable runout cancellation in sectored servo disk drive positioning system
Ara W. Nazarian,Charles W. Simmons,Thao P. Trieu,Richard K. Wong +3 more
- 26 Jun 2000
TL;DR: In this paper, the authors propose a method in a magnetic storage disk drive for independently learning and thereafter canceling repeatable runout that is written to the servo fields of each servo track during the writing process.
199
Patent
Disk system with sub-actuators for fine head displacement
Kenji Mori,Hiromu Hirai,Haruaki Otsuki,Tsuyoshi Takahashi,Jun Naruse,Nishimura Yuji,Muneo Kawamoto +6 more
- 26 Jun 1990
TL;DR: In this paper, a magnetic disk system using a voice coil motor and a piezoelectric element provided on a head supporting arm to precisely position a head to a predetermined position on a disk is described.
158
Error rate performance of experimental gigabit per square inch recording components
TL;DR: In this article, the authors measured the on-track and off-track error-rate performance of several combinations of experimental heads and disks using a partial-response channel at approximately 1 Gb/in/sup 2.
149
Patent
Disk drive with primary and secondary actuator drives
Zine-Eddine Boutaghou,Hal Hjalmar Ottesen +1 more
- 30 Aug 1994
TL;DR: In this article, a secondary actuator for increased positional resolution of a read/write head for a DASD is disposed on the distal end of an actuator arm and acts to pivotally move the load beam about the attachment axis.
139