Title :
Multi-variable velocity feedback controller for piezoelectric tube scanner: A “mixed” negative-imaginary and small-gain approach
Author :
Das, Sajal K. ; Pota, Hemanshu R. ; Petersen, Ian R.
Author_Institution :
Sch. of Eng. & Inf. Technol., Univ. of New South Wales, Canberra, NSW, Australia
Abstract :
This paper presents the design and implementation of a multi-input multi-output (MIMO) velocity feedback controller (VFC) based on a recent theoretical results on “mixed” negative-imaginary and small-gain approach to damp the first resonant mode of a piezoelectric tube scanner (PTS) used in atomic force microscopes (AFMs). The identification of the MIMO dynamics of the PTS is done by using the measured data and the “mixed” negative-imaginary and small-gain approach is used to establish the internal stability between the PTS and the velocity feedback controller. Experimental results are presented to demonstrate the effectiveness of the proposed controller.
Keywords :
atomic force microscopy; multivariable control systems; piezoelectric devices; velocity control; AFM; MIMO velocity feedback controller; VFC; atomic force microscopes; first resonant mode; mixed negative imaginary; multi input multi output; multivariable velocity feedback controller; piezoelectric tube scanner; small gain approach; Adaptive control; Closed loop systems; Damping; Electron tubes; Frequency control; Frequency response; Resonant frequency; atomic force microscope; multi-variable velocity feedback controller; negative-imaginary systems; piezoelectric; tube scanner.;
Conference_Titel :
Control Conference (CCC), 2013 32nd Chinese
Conference_Location :
Xi´an
