Almost Decoupling by Quantitative Feedback Theory

[+] Author and Article Information
R. A. Perez

Mechanical Engineering Department, University of Wisconsin-Milwaukee, Milwaukee, WI 53201

O. D. I. Nwokah, D. F. Thompson

School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907

J. Dyn. Sys., Meas., Control 115(1), 27-37 (Mar 01, 1993) (11 pages) doi:10.1115/1.2897404 History: Received August 22, 1990; Revised April 02, 1992; Online March 17, 2008


This paper uses almost decoupling theory to obtain a systematic solution to the MIMO-QFT problem by an n times solution of the SISO-QFT sensitivity constraint problem. This is similar to the current MIMO-QFT formulation that requires in principle an n times solution for the elements of the closed-loop transfer matrix. The problem is also in a form where direct comparison with H ∞ control is feasible. However, due to the use of unstructured perturbation description, this design route along with all H ∞ based design methods will invariably produce more conservative (higher bandwidth) controllers than classical QFT .

Copyright © 1993 by The American Society of Mechanical Engineers
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