Results 211 to 220 of about 99,857 (266)

Track-Following Control Using Resonant Filter in Hard Disk Drives

IEEE/ASME Transactions on Mechatronics, 2007
A design method to suppress the disturbances by using a resonant filter for track-following control has been developed. The resonant filter can realize a stable resonant mode by a filter to obtain a circular vector locus that recedes from the critical point on the Nyquist diagram.
Takenori Atsumi, Atsushi Okuyama, Masahito Kobayashi   +2 more
openaire   +1 more source

Tracking Property of Adjacent Track Servo System for Optical Disk Drives

Japanese Journal of Applied Physics, 2011
An adjacent track servo (ATS) technology for recording to an optical disk without track information is expected to produce optical disks with lower cost. The main problem of the ATS system is its stability. Generally, ATS systems become stable with a feed-forward controller.
Yoshiyuki Urakawa, Yuichi Suzuki, Tsutomu Ishimoto, Tomoharu Mukasa, Junichi Horigome   +4 more
openaire   +1 more source

Prediction of track misregistration due to disk flutter in hard disk drive

IEEE Transactions on Magnetics, 2002
Disk runout consists of repeatable runout (RRO) and nonrepeatable runout (NRRO). NRRO is the main cause of track misregistration that prevents a high track density, whereas tracking servo control can compensate for most of RRO. An increase in the disk rotation speed increases the amplitude of disk flutter and, hence, causes head position error.
null Young-Bae Chang, null Dae-Kyong Park, null No-Cheol Park, null Young-Pil Park   +3 more
openaire   +1 more source

A nonlinear track following controller for hard disk drives

2000 Asia-Pacific Magnetic Recording Conference. Digests of APMRC2000 on Mechanical and Manufacturing Aspects of HDD (Cat. No.00EX395), 2002
Most of the HDD track following controller are linear controllers. This paper presents a nonlinear control scheme for track following. The controller mainly includes the parts: Tracking Differentiator (TD), Extended State Observer (ESO) and Nonlinear PID (NLPID).
null Jianyi Wang, null Youyi Wang, null Guoxiao Guo   +2 more
openaire   +1 more source

Magneto-Optic Disk Drive of High Speed Track Accessability

Japanese Journal of Applied Physics, 1987
This paper describes 5 1/4-in. high track-access performance magneto-optic disk drive. The drive employs a split optical system with a swing-arm actuator, the inertia of which is 160 g cm2(equivalent to a linear actuator of 10 g weight). An avarage seek time was estimated less than 35ms in the absence of latency.
Hiromichi Ishibashi, Ryosuke Shimizu, Masaharu Imura, Makoto Kuwamoto, Hajime Yamamoto, Shin-ichi Tanaka, Takeshi Shimamoto   +6 more
openaire   +1 more source

Triple-Stage Track-Following Servo Design for Hard Disk Drives

Volume 2: Mechatronics; Mechatronics and Controls in Advanced Manufacturing; Modeling and Control of Automotive Systems and Combustion Engines; Modeling and Validation; Motion and Vibration Control Applications; Multi-Agent and Networked Systems; Path Planning and Motion Control; Robot Manipulators; Sensors and Actuators; Tracking Control Systems; Uncertain Systems and Robustness; Unmanned, Ground and Surface Robotics; Vehicle Dynamic Controls; Vehicle Dynamics and Traffic Control, 2016
This paper studies possible robust control design methods in triple-stage actuation settings for achieving minimum position error signal (PES) while maintaining enough stability margins. Firstly, the sensitivity-decoupling design technique, is utilized to estimate the resulting increase in low frequency disturbance attenuation and servo bandwidth.
Jinwen Pan, Omid Bagherieh, Behrooz Shahsavari, Roberto Horowitz   +3 more
openaire   +1 more source

Multirate digital control for high track density magnetic disk drives

IEEE Transactions on Magnetics, 2003
As track density increases, higher control bandwidth is required to attain sufficient positioning accuracy while suppressing the effect of high frequency disturbances in disk drive controllers/actuators. This paper presents a computation effective fixed order multirate digital control system.
null Seung-Hi Lee, null Chung Choo Chung, null Sang-Min Suh   +2 more
openaire   +1 more source

Track-Following Controller Design for a Compound Disk Drive Actuator

Journal of Dynamic Systems, Measurement, and Control, 1990
The use of compound actuators in both magnetic and optical disk files has become a means of achieving increased servo actuator bandwidths. A compound actuator, comprised of a fine actuator mounted “piggyback” on a coarse actuator, positions the read/write transducers above a radial track.
Jia-Yush Yen, Kurt Hallamasek, Roberto Horowitz   +2 more
openaire   +1 more source

Dynamics affecting tracking bias in hard disk drive rotary actuators

Proceedings of 1995 American Control Conference - ACC'95, 2005
The hand-off from seeking tracking in hard disk drives can be made more quickly if the average bias current necessary to maintain tracking is known a priori. It has been observed that there are several variables which influence bias including the history of seeks made by the drive.
K. Eddy, W. Messner
openaire   +1 more source

Optimization of track seeking pulse waveform in hard disk drives

Digest of the Asia-Pacific Magnetic Recording Conference, 2003
Track access time is an important parameter for high performance hard disk drives (HDDs). Presently, the resonances of the head actuator assembly (HAA) caused by the pivot stiffness and mass of the HAA are becoming an even more urgent problem, since these resonances have become the main design factor which limits further reduction of track access time ...
null Sheng Zeng, null Limei Xu, null Rongming Lin, null Ningqun Guo   +3 more
openaire   +1 more source