Compensation of VCM actuator pivot friction based on an operator modeling method / Chunling Du in IEEE Transactions on control systems technology, Vol. 18 N° 4 (Juillet 2010)  

Public ISBD [article]  inIEEE Transactions on control systems technology > Vol. 18 N° 4 (Juillet 2010) . - pp. 918-926 Titre : Compensation of VCM actuator pivot friction based on an operator modeling method Type de document : texte imprimé Auteurs : Chunling Du, Auteur ; Lihua Xie, Auteur ; Zhang, Jingliang, Auteur Année de publication : 2011 Article en page(s) : pp. 918-926 Note générale : Génie Aérospatial Langues : Anglais (eng) Mots-clés : Friction modeling and compensation Hard disk drives (HDDs) Hysteresis Prandlt operator Sensitivity function Index. décimale : 629.1 Résumé : The pivot friction of voice-coil-motor (VCM) actuator is measured for a 1.8-in small disk drive with disk rotating and slider flying. The measurement is carried out under the conditions that the actuator is controlled and the head movement amplitude is growing by changing the references. The hysteresis of friction versus head position is then obtained. An operator-based modeling approach is adopted for the hysteresis, and an optimal model is obtained by minimizing the energy gain between the head position and the modeling error. It is also found that the frequency response of the actuator model with the inclusion of the hyteresis model matches well with the measured frequency response of the actuator. A friction compensation method based on the nonlinear hysteresis model is thus proposed. The simulation and implementation results demonstrate a significant improvement in disturbance rejection at low frequencies. DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5238637 [article] Compensation of VCM actuator pivot friction based on an operator modeling method [texte imprimé] / Chunling Du, Auteur ; Lihua Xie, Auteur ; Zhang, Jingliang, Auteur . - 2011 . - pp. 918-926. Génie Aérospatial Langues : Anglais (eng) in IEEE Transactions on control systems technology > Vol. 18 N° 4 (Juillet 2010) . - pp. 918-926 Mots-clés : Friction modeling and compensation Hard disk drives (HDDs) Hysteresis Prandlt operator Sensitivity function Index. décimale : 629.1 Résumé : The pivot friction of voice-coil-motor (VCM) actuator is measured for a 1.8-in small disk drive with disk rotating and slider flying. The measurement is carried out under the conditions that the actuator is controlled and the head movement amplitude is growing by changing the references. The hysteresis of friction versus head position is then obtained. An operator-based modeling approach is adopted for the hysteresis, and an optimal model is obtained by minimizing the energy gain between the head position and the modeling error. It is also found that the frequency response of the actuator model with the inclusion of the hyteresis model matches well with the measured frequency response of the actuator. A friction compensation method based on the nonlinear hysteresis model is thus proposed. The simulation and implementation results demonstrate a significant improvement in disturbance rejection at low frequencies. DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5238637

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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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