NASA NTRS · 19790057120
A multiloop generalization of the circle stability criterion
Abstract
A frequency-domain stability criterion is presented, generalizing the well-known circle stability criterion to multiloop feedback systems having bounded nonlinearity, parameter variations, and/or frequency-dependent ignorance of component dynamics. Unlike previous generalizations, the theory is not restricted to weakly-coupled, diagonally dominant or nearly normal systems. Potential applications include the analysis of feedback system integrity and multiloop feedback system stability margins.
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Safonov, M. G., Athans, M.. 1979-01-01. A multiloop generalization of the circle stability criterion. https://ntrs.nasa.gov/citations/19790057120
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