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Saturation-induced instability and its avoidance in adaptive control of hard disk drives / Néstor O. Perez-Arancibia 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. 368-382 Titre : Saturation-induced instability and its avoidance in adaptive control of hard disk drives Type de document : texte imprimé Auteurs : Néstor O. Perez-Arancibia, Auteur ; Tsu-Chin, Tsao, Auteur ; James S. Gibson, Auteur Année de publication : 2011 Article en page(s) : pp. 368-382 Note générale : Génie Aérospatial Langues : Anglais (eng) Mots-clés : Control-signal  saturation  Frequency  weighting  Hard  disk  drive  (HDD)  Iterative  adaptative  tuning  Minimum  variance  adaptive  control Index. décimale : 629.1 Résumé : This paper presents an investigation of the design and implementation of minimum-variance adaptive controllers for computer hard disk drive (HDD) read-write track following. A common characteristic of minimum-variance controllers, adaptive or not, is that they rely on prediction filters with large high- frequency gains to predict broadband disturbances, and this often produces control-signal saturation and eventual loss of stability. Two methods are introduced here to address this issue. The first method, suitable for online adaptive control, uses frequency weighting to constrain the high-frequency gain of the prediction filter. The second method, suitable for tuning fixed-gain controllers, employs an adaptive scheme iteratively over a finite duration. Both methods were implemented on a commercial hard disk drive, and experimental results demonstrate their effectiveness. DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5229135 [article] Saturation-induced instability and its avoidance in adaptive control of hard disk drives [texte imprimé] / Néstor O. Perez-Arancibia, Auteur ; Tsu-Chin, Tsao, Auteur ; James S. Gibson, Auteur . - 2011 . - pp. 368-382. Génie Aérospatial Langues : Anglais (eng) in IEEE Transactions on control systems technology > Vol. 18 N° 2 (Mars 2010) . - pp. 368-382 Mots-clés : Control-signal  saturation  Frequency  weighting  Hard  disk  drive  (HDD)  Iterative  adaptative  tuning  Minimum  variance  adaptive  control Index. décimale : 629.1 Résumé : This paper presents an investigation of the design and implementation of minimum-variance adaptive controllers for computer hard disk drive (HDD) read-write track following. A common characteristic of minimum-variance controllers, adaptive or not, is that they rely on prediction filters with large high- frequency gains to predict broadband disturbances, and this often produces control-signal saturation and eventual loss of stability. Two methods are introduced here to address this issue. The first method, suitable for online adaptive control, uses frequency weighting to constrain the high-frequency gain of the prediction filter. The second method, suitable for tuning fixed-gain controllers, employs an adaptive scheme iteratively over a finite duration. Both methods were implemented on a commercial hard disk drive, and experimental results demonstrate their effectiveness. DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5229135