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A unified control scheme for track seeking and following of a hard disk drive servo system / Chin Kwan Thum in IEEE Transactions on control systems technology, Vol. 18 N° 2 (Mars 2010) 

Public ISBD [article]  in IEEE Transactions on control systems technology > Vol. 18 N° 2 (Mars 2010) . - pp. 294-306 Titre : A unified control scheme for track seeking and following of a hard disk drive servo system Type de document : texte imprimé Auteurs : Chin Kwan Thum, Auteur ; Chunling Du, Auteur ; Chen, Ben M., Auteur Année de publication : 2011 Article en page(s) : pp. 294-306 Note générale : Génie Aérospatial Langues : Anglais (eng) Mots-clés : Hard  disk  drives  (HDDs)  Mechatronics  Mode  switching  Nonlinear  time-varying  systems  (NLTV)  Servo  systems Index. décimale : 629.1 Résumé : This paper proposes a new nonlinear time-varying unified control scheme (UCS) for track-seeking and track-following in hard disk drives (HDDs) so as to avoid problem of mode switching. The proposed control scheme utilizes the concept of the conventional composite nonlinear feedback (CNF) scheme to achieve fast and smooth seeking. In order to be advantageous over the conventional CNF control, the UCS consists of both linear and nonlinear time-dependent components, which are independent of absolute seeking error. Simulation and implementation results show that, during track-seeking mode, the proposed scheme has a significantly better performance robustness against variations in seek length as compared to the conventional CNF control. For track-following, disturbance and noise models are involved in the problem formulation and sub-optimal H ?? method is used to design the controller so as to achieve high head-positioning accuracy. It turns out that the unified controller removes 27.8% of the nonrepeatable disturbances and noise. DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5152960 [article] A unified control scheme for track seeking and following of a hard disk drive servo system [texte imprimé] / Chin Kwan Thum, Auteur ; Chunling Du, Auteur ; Chen, Ben M., Auteur . - 2011 . - pp. 294-306. Génie Aérospatial Langues : Anglais (eng) in IEEE Transactions on control systems technology > Vol. 18 N° 2 (Mars 2010) . - pp. 294-306 Mots-clés : Hard  disk  drives  (HDDs)  Mechatronics  Mode  switching  Nonlinear  time-varying  systems  (NLTV)  Servo  systems Index. décimale : 629.1 Résumé : This paper proposes a new nonlinear time-varying unified control scheme (UCS) for track-seeking and track-following in hard disk drives (HDDs) so as to avoid problem of mode switching. The proposed control scheme utilizes the concept of the conventional composite nonlinear feedback (CNF) scheme to achieve fast and smooth seeking. In order to be advantageous over the conventional CNF control, the UCS consists of both linear and nonlinear time-dependent components, which are independent of absolute seeking error. Simulation and implementation results show that, during track-seeking mode, the proposed scheme has a significantly better performance robustness against variations in seek length as compared to the conventional CNF control. For track-following, disturbance and noise models are involved in the problem formulation and sub-optimal H ?? method is used to design the controller so as to achieve high head-positioning accuracy. It turns out that the unified controller removes 27.8% of the nonrepeatable disturbances and noise. DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5152960