Modelling and Control of High Density Data Storage Mechatronic Servo Systems: A Case Study with Hard Disc Drives
Speaker: Dr. Justin Pang, Central Research Laboratory, Hitachi Ltd. Japan
When: 2007-12-12 16:00:00
Venue: 78-420
Host: Zhao Yang Dong
Abstract:Track densities in magnetic recording demonstrations for future Hard-Disc
Drives (HDDs) are projected to exceed 500,000 Tracks-Per-Inch (TPI) in the
year 2007 and are still increasing. However due to the renowned
superparamagnetic limitation in magnetic recording physics, data storage
industries are venturing into dual-stage actuator systems, i.e. appending a
secondary actuator onto the current primary actuator (the Voice Coil Motor
(VCM)), for high density nanometre scale recording.
This seminar will commence with a short overview of hard disc drives. This
will be followed by an introduction to the servo technologies that are
currently used. The use of novel control topologies incorporating multi and
self-sensing (employing the actuator as a sensor simultaneously)
sampled-data servo systems are proposed. Specific consideration will be
given to sensor fusion issues for actuator-sensor collocation. Improved
track-following performance in piezoelectric-actuated storage systems is
achieved with stronger disturbance rejection capabilities. The robustness of
the proposed control algorithms, and their ability to fulfil the data
storage demands required for future consumer’s mobile electronic devices, is
also improved. The seminar will conclude with a discussion on some open
problems faced by HDD industries as well as HDD servo control benchmark
problems proposed by academia.
Biography:Chee Khiang (Justin) Pang (S'04-M'07) was born in Singapore. He received the
B.Eng. (Hons.), M. Eng., and Ph. D. degrees, all in electrical and computer
engineering, from the National University of Singapore (NUS). From February
to June 2003, he was a Visiting Scholar in the School of Information
Technology and Electrical Engineering, University of Queensland. During this
time he was investigating the probabilistic small signal stability of
large-scale interconnected power systems. This work was funded by the
Electric Power Research Institute (EPRI), Palo Alto, CA, USA. Since April
2006, he has been with Storage Technology Research Centre, Central Research
Laboratory, Hitachi, Ltd., Fujisawa, Kanagawa, Japan. His current research
interests include vibration analysis and servo control in sampled-data
mechatronics, multisensing and active control in Hard Disc Drives (HDDs),
and the Self Servo-track Writing (SSW) process.
Type: Control Systems Society/Robotics & Automation Seminar
Contact:Zhao Yang Dong, seminar host (zdong@itee.uq.edu.au)
or Guido Governatori (ITEE seminar co-ordinator)
(guido@itee.uq.edu.au)