Results 231 to 240 of about 99,857 (266)

Improved track following in magnetic disk drives using a disturbance observer

IEEE/ASME Transactions on Mechatronics, 2000
Improving the position control of the disk drive read/write heads is an important step in increasing the storage capacity of a drive, especially in the presence of internal and external disturbances. To address this problem, the typical feedback loop of a disk drive servo system was augmented with a disturbance observer.
M.T. White, M. Tomizuka, C. Smith
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Dual-stage track-following servo design for hard disk drives

Proceedings of the 1999 American Control Conference (Cat. No. 99CH36251), 1999
Discrete time, 25 KTPI track-following servos were designed for magnetic hard disk drive dual stage actuators using the /spl mu/-synthesis methodology. The design methodology was tested on two microactuator models. The first is a model of a piezoelectrically actuated suspension, under development by Hutchinson Technology Incorporated.
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A Micro-Actuator for a Hard-Disk Drive Fine Tracking Servo

Micro-Electro-Mechanical Systems (MEMS), 1998
Abstract This paper reports on the design, fabrication and testing of an electrostatic micro-actuator for a magnetic Hard-Disk Drive (HDD) tracking servo. First, the design requirements for a micro-actuator in this application were investigated.
Toshiki Hirano, Long-Sheng Fan, Wen Y. Lee, John Hong, Tetsuo Semba, Wayne Imaino, Surya Pattanaik, Susanna Chan, Patrick Webb   +8 more
openaire   +1 more source

High-Speed Tracking Control System for Broadcast-Use Optical Disk Drive

Japanese Journal of Applied Physics, 2005
The proposed ZPET-FF control system suppressed tracking error to less than 9 nm at high speed in the optical recording system of NA: 0.85. We confirmed the system is effective for high-data-transfer-rate optical disk drives.
Daiichi Koide, Haruki Tokumaru, Kiyoshi Ohishi, Kazuyoshi Kuramochi, Toshimasa Miyazaki   +4 more
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Repetitive controller design for minimum track misregistration in hard disk drives

IEEE Transactions on Magnetics, 2005
Repetitive control is a widely used technique for the compensation of repeatable error in systems that contain rotating mechanisms or repeat a trajectory. Generally, it includes delay chains and a low-pass filter in the positive feedback loop, which generate a periodic signal.
null Sung-Won Park, null Jun Jeong, null Hyun Seok Yang, null Young-Pil Park, null No-Cheol Park   +4 more
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Design of a robust track-following controller for optical disk drives

IEEE Transactions on Consumer Electronics, 2004
In this paper, we design a robust track-following controller that satisfies the transient response specifications and diminishes the influence of sinusoidal disturbance. To this end, a robust control problem with the multiple constraints is considered.
null Moon-Noh Lee, null Kyoung Bog Jin, null Jong Keuk Lee   +2 more
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A new approach for track following control of optical disk drive

Digest of the Asia-Pacific Magnetic Recording Conference, 2003
A model predictive control based minimum variance control (MVC) scheme for the track following control of DVD-ROMs is studied in this paper. An add-on signal with enough excitation is combined with the control signal coming from the DVD control chip to drive the track following servo system such that the tracking error within a certain range is ...
null Fengdan Dong, null Youyi Wang, null Jianying Zhou   +2 more
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Access system requirement for high track per inch hard disk drives

2000 Asia-Pacific Magnetic Recording Conference. Digests of APMRC2000 on Mechanical and Manufacturing Aspects of HDD (Cat. No.00EX395), 2002
This paper proposes a self-tuning controller for a dual-stage servo system to maximize the track per inch (TPI) in a hard disk drive given the actuator bandwidth limitations. The projected TPI given various access systems limitations is also presented.
null Guoxiao Guo, null Qi Hao, null Teck-Seng Low   +2 more
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Development of Hard Disk Drive Tracking Yield System

Khon Kaen University Journal (Graduate Studies), 2011
Shutchon Premchaisawatt, Dr.Wanida Kanarkard   +1 more
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Probabilistic analysis of off-track capability for higher density disk drives

2009 Asia-Pacific Magnetic Recording Conference, 2009
To increasing track density, off-track capability was calculated by using theoretical probabilistic positioning model and definition of data error rate. The results agree with experimental value. This shows the validity of unified probabilistic treatment between mechanical positioning and read write process.
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