Title :
Adaptive control of a nanopositioning device
Author :
Eielsen, Arnfinn A. ; Gravdahl, Jan Tommy
Author_Institution :
Dept. of Eng. Cybern., Norwegian Univ. of Sci. & Technol., Trondheim, Norway
Abstract :
High-bandwidth tracking control is desirable in many nanopositioning applications, including scanning probe microscopy. Typical nanopositioner designs have several sources of uncertainty which can degrade control performance, and even induce instability. Salient uncertainties are in the control gain and the resonant frequencies of the mechanical structure. The control gain varies due to hysteresis and creep which result in a control gain that is dependent on the offset, range, and form of the driving signal, as well as actuator temperature and age. The resonant frequencies change due to payload mass. In order to maintain performance in the presence of a moderately changing dynamic response, a model reference adaptive control (MRAC) scheme is proposed and implemented. The details of implementing a working MRAC will be discussed. Most notably, a novel augmentation of the parameter identification scheme in the form of a special pre-filter will be shown to be necessary to obtain parameter convergence, and thus also for stability and performance in the case of the MRAC scheme. Experimental results are presented to assess the performance.
Keywords :
creep; hysteresis; model reference adaptive control systems; nanopositioning; uncertain systems; MRAC scheme; actuator temperature; control gain; creep; dynamic response; high-bandwidth tracking control; hysteresis; instability; mechanical structure; model reference adaptive control; nanopositioner design; nanopositioning device; parameter identification scheme; payload mass; prefilter; resonant frequency; salient uncertainty; scanning probe microscopy; Adaptation models; Computational modeling; Convergence; Nanopositioning; Payloads; Sensitivity; Uncertainty;
Conference_Titel :
Decision and Control (CDC), 2012 IEEE 51st Annual Conference on
Conference_Location :
Maui, HI
Print_ISBN :
978-1-4673-2065-8
Electronic_ISBN :
0743-1546
DOI :
10.1109/CDC.2012.6426799