The second edition of this monograph provides a systematic
treatment of the design of modern hard disk drive servo systems
updated with the latest research results to reflect recent
improvements in spindle speed and bit density and other changes in
this fast-moving field. In particular, it focuses on the
applications of some newly developed results in control theory,
i.e., robust and perfect tracking control and composite non-linear
feedback control which are suitable for track following and seeking
respectively. Emphasis is placed on hard disk drive servo systems
with single- or dual-stage actuation using a voice-coil-motor
actuator enhanced in the latter case by the addition of a
micro-actuator providing faster responses and therefore higher
bandwidth in track following. Other issues such as modeling and
compensation of nonlinearities and friction in microdrives,
disturbance rejection and resonance compensation are also
addressed.
The techniques and applications involved include:
- time- and frequency domain methods for system
identification;
- physical effect approaches for parameter identification;
- linear systems tools;
- linear control techniques (PID, H2, H-infinity, and other
robust control methods);
- classical nonlinear control techniques (time-optimal, proximate
time-optimal, and mode switching control);
- composite nonlinear feedback (CNF) control;
- complete single- and dual-stage hard disk drive servo
systems;
- time- and frequency domain properties of hard disk drive servo
systems;
- design of piezoelectric actuator systems;
- modeling and compensation of nonlinearities and friction
inmicrodrives.
Hard Disk Drive Servo Systems will be of great value to
practicing engineers in the hard disk and CD-ROM drive industries
and to researchers in areas related to servo systems. The Linear
Systems and CNF MATLABA(R) toolkits used to develop many of the
results in this book can be downloaded from Professor Chena (TM)s
website.
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