An Alternate Geometric Perspective on MIMO Systems

Document Type

Article

Language

eng

Publication Date

9-1993

Publisher

American Society of Mechanical Engineers

Source Publication

Journal of Dynamic Systems, Measurement, and Control

Source ISSN

0022-0434

Abstract

An alternate graphical representation of linear, time-invariant, multi-input, multi-output (MIMO) system dynamics is proposed that is highly suited for exploring the influence of closed-loop system parameters. The development is based on the adjustment of a scalar forward gain multiplying a cascaded multivariable controller/plant embedded in an output feedback configuration. By tracking the closed-loop eigenvalues as explicit functions of gain, it is possible to visualize the multivariable root loci in a set of “gain plots” consisting of two graphs: (i) magnitude of system eigenvalues versus gain and (ii) argument (angle) of system eigenvalues versus gain. The gain plots offer an alternative perspective of the standard MIMO root locus plot by depicting unambiguously the polar coordinates of each eigenvalue in the complex plane. Two example problems demonstrate the utility of gain plots for interpreting closed-loop multivariable system behavior.

Comments

Journal of Dynamic Systems, Measurement, and Control, Vol. 115, No. 3 (September 1993): 538-543. DOI.

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