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Qualitative features of matrix pencils and DAEs arising in circuit dynamics
Authors:Ricardo Riaza  Caren Tischendorf
Affiliation:1. Departamento de Matemática Aplicada a las Tecnologías de la Información , Escuela Técnica Superior de Ingenieros de Telecomunicación, Universidad Politécnica de Madrid , 28040 Madrid , Spain;2. Mathematisches Institut, Universit?t zu K?ln , Weyertal 86-90, 50931 K?ln , Germany
Abstract:The dynamical behaviour of nonlinear electrical circuits is usually modelled in the time domain by differential-algebraic equations (DAEs). The differential-algebraic formalism drives qualitative analyses based on linearization to a matrix pencil setting. In this context, the present paper performs a spectral analysis of matrix pencils and DAEs arising in nonlinear circuit theory. Specifically, the non-singularity, hyperbolicity and asymptotic stability of equilibria are addressed in terms of circuit topology. The differential-algebraic framework puts the results beyond those already known for state-space models, unfeasible in many actual problems. The topological conditions arising in this qualitative study are proved independent of those supporting the index, and therefore they apply to both index-1 and index-2 configurations. The approach illustrates how graph theory, matrix analysis and DAE theory interact in the dynamical study of nonlinear circuits.
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