On a New Characterization of Linear Passive Systems.
MARTIN MARIETTA CORP BALTIMORE MD RESEARCH INST FOR ADVANCED STUDIES
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The purpose of the paper is to characterize or realize the NxN matrix function Z dot of the complex variable s as a finite dimensional constant linear dynamical system. Concept of reducibility is then introduced. The paper then discusses the relationship between various realizations of Z dot which is the main idea motivating the research. Restrictions due to passivity and reciprocity are next presented. A theorem gives a more precise and more general characterization of passivity than was heretofore available. Finally the usefulness of the characterization theorem and the group theoretic ideas related to it are illustrated by two examples. Author
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