On the fast motion control of R/W head track following in hard-disc-drives Online publication date: Wed, 29-Nov-2017
by Manel Taktak-Meziou; Jawhar Ghommam; Nabil Derbel
International Journal of Digital Signals and Smart Systems (IJDSSS), Vol. 1, No. 3, 2017
Abstract: The main objective of this study is to address the track-following problem of a read/write (R/W) head of a hard-disk-drive (HDD) servo-system in presence of external disturbances. Sliding mode algorithms ranging from classical approach (SMC) to adaptive continuous twisting algorithm (ACTA) are therefore developed to control the R/W head tip. Such a comparative study, as has never been conducted before on such a system, aims to highlight the efficiency of the sliding mode control algorithms to achieve good tracking performances despite the presence of disturbances. A continuous twisting algorithm (CTA) is proved to ensure finite time convergence of the system to the desired trajectory by adjusting the controller gains when the upper bound of derivative of the perturbation exists and it is well known. Then, in order to relax the constraint of knowing that bound, the ACTA control approach based on an adaptive gain is introduced. Simulation studies are presented.
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