Title :
Adaptive-delay combined feedforward/feedback control for raster tracking with applications to AFMs
Author :
Butterworth, J.A. ; Pao, L.Y. ; Abramovitch, D.Y.
Author_Institution :
Dept. of Electr., Comput., & Energy Eng., Univ. of Colorado at Boulder, Boulder, CO, USA
fDate :
June 30 2010-July 2 2010
Abstract :
In previous work, we evaluated the performance of two control architectures applied to atomic force microscopes (AFM). Experimental results in indicated that the closed-loop-injection (FFCLI) architecture outperformed the plant-injection (FFPI) architecture when using a specific model-inversion feedforward technique for the tracking of a raster pattern. Empirical work suggested that a nontraditional variation upon the experimentally inferior FFPI architecture may allow it to track a raster pattern at a performance level in the neighborhood of the FFCLI architecture. This variation is manifested as additional delay inserted in the feedforward control system. An online adaptive technique is used to determine the required amount of additional delay. Experimental results show that the performance level of the FFCLI architecture and the adaptive-delay FFPI architecture are comparable.
Keywords :
closed loop systems; feedback; feedforward; stability; tracking; atomic force microscope; closed loop injection architecture; feedforward control system; model inversion feedforward technique; online adaptive technique; plant injection architecture; raster tracking; stability; Adaptive control; Adaptive filters; Added delay; Atomic force microscopy; Feedback control; Force control; Force feedback; Power engineering and energy; Robust stability; Transfer functions;
Conference_Titel :
American Control Conference (ACC), 2010
Conference_Location :
Baltimore, MD
Print_ISBN :
978-1-4244-7426-4
DOI :
10.1109/ACC.2010.5531149