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A Fuzzy logic controller (FLC) which integrates track-seeking
following controllers into one is successfully implemented on
processor to improve the performance of the hard disk drive
(HDD) rvo in this thesis. The overall control process in disc
head otion usually includes the seeking and the following
stages. onally, there are different controllers for the two
stages ely. Although some studies on HDD have been presented in
the ure, little effort has been made to integrate both
controllers one. Fuzzy control methodology possesses both
excellent transient sponse and robustness characteristics.
Single fuzzy rule-based ollers for HDD are consequently
proposed for the purpose of head-positioning response. This
thesis describes three different approaches to integrate ack-
seeking and following stages. Firstly, a single-table FLC bases
on scaling the input and output variables to perform the ioning
servo with the same fuzzy look-up table. Secondly, an SFLC
associates the SFLC with bang-bang control strategy for the
uction of access time. Thirdly, a prediction controller based
on ursive least-square method is proposed to improve the
robustness the HDD servo system. Moreover, a multi-table FLC
(MFLC) C.J. Liou employ various membership functions and rule
bases to both the seeking and the following modes. In this
study, the MFLC also designed for comparison. From the results,
the three type FLCs are indeed superior to the MFLC.
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