A hard-disk-drive servo system design using composite nonlinear-feedback control with optimal nonlinear gain tuning methods / Lan, Weiyao in IEEE transactions on industrial electronics, Vol. 57 N° 5 (Mai 2010)  

Public ISBD [article]  inIEEE transactions on industrial electronics > Vol. 57 N° 5 (Mai 2010) . - pp. 1735 - 1745 Titre : A hard-disk-drive servo system design using composite nonlinear-feedback control with optimal nonlinear gain tuning methods Type de document : texte imprimé Auteurs : Lan, Weiyao, Auteur ; Chin Kwan Thum, Auteur ; Chen, Ben M., Auteur Année de publication : 2011 Article en page(s) : pp. 1735 - 1745 Note générale : Génie électrique Langues : Anglais (eng) Mots-clés : Hard disk drive (HDD) Nonlinear feedback Servo system Tracking control Transient performance Index. décimale : 621.38 Dispositifs électroniques. Tubes à électrons. Photocellules. Accélérateurs de particules. Tubes à rayons X Résumé : This paper investigates the design of composite nonlinear-feedback (CNF) control law for a hard-disk-drive (HDD) servo system. First, a scaled nonlinear function is introduced for the CNF control law, in which a parameter is scaled by the error between the amplitude of the target reference and the initial value of the system controlled output. The closed-loop system under the scaled function has robust transient performance to the variation of the amplitude of the target reference. Then, the parameters of the selected nonlinear function are tuned by optimal tuning methods. More specifically, the parameter-tuning problem is formulated as an optimization problem, which can be solved efficiently via numerical methods. The simulation and experimental results show that the control law designed using the new approach yields excellent performance for both track seeking and track following in the HDD servo system. DEWEY : 621.38 ISSN : 0278-0046 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5256288 [article] A hard-disk-drive servo system design using composite nonlinear-feedback control with optimal nonlinear gain tuning methods [texte imprimé] / Lan, Weiyao, Auteur ; Chin Kwan Thum, Auteur ; Chen, Ben M., Auteur . - 2011 . - pp. 1735 - 1745. Génie électrique Langues : Anglais (eng) in IEEE transactions on industrial electronics > Vol. 57 N° 5 (Mai 2010) . - pp. 1735 - 1745 Mots-clés : Hard disk drive (HDD) Nonlinear feedback Servo system Tracking control Transient performance Index. décimale : 621.38 Dispositifs électroniques. Tubes à électrons. Photocellules. Accélérateurs de particules. Tubes à rayons X Résumé : This paper investigates the design of composite nonlinear-feedback (CNF) control law for a hard-disk-drive (HDD) servo system. First, a scaled nonlinear function is introduced for the CNF control law, in which a parameter is scaled by the error between the amplitude of the target reference and the initial value of the system controlled output. The closed-loop system under the scaled function has robust transient performance to the variation of the amplitude of the target reference. Then, the parameters of the selected nonlinear function are tuned by optimal tuning methods. More specifically, the parameter-tuning problem is formulated as an optimization problem, which can be solved efficiently via numerical methods. The simulation and experimental results show that the control law designed using the new approach yields excellent performance for both track seeking and track following in the HDD servo system. DEWEY : 621.38 ISSN : 0278-0046 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5256288

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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]  inIEEE 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 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 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

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