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Trajectories of a DAE near a pseudo-equilibrium
KTH, Superseded Departments, Vehicle Engineering.
2004 (English)In: Nonlinearity, ISSN 0951-7715, E-ISSN 1361-6544, Vol. 17, no 1, 253-279 p.Article in journal (Refereed) Published
Abstract [en]

We consider a class of differential-algebraic equations (DAEs) defined by analytic nonlinearities and study its singular solutions. The main assumption used is that the linearization of the DAE represents a Kronecker index-2 matrix pencil and that the constraint manifold has a quadratic fold along its singularity. From these assumptions we obtain a normal form for the DAE where the presence of the singularity and its effects on the dynamics of the problem are made explicit in the form of a quasi-linear differential equation. Subsequently, two distinct types of singular points are identified through which there pass exactly two analytic solutions: pseudo-nodes and pseudo-saddles. We also demonstrate that a singular point called a pseudo-node supports an uncountable infinity of solutions which are not analytic in general. Moreover, akin to known results in the literature for DAEs with singular equilibria, a degenerate singularity is found through which there passes one analytic solution such that the singular point in question is contained within a quasi-invariant manifold of solutions. We call this type of singularity a pseudo-centre and it provides not only a manifold of solutions which intersects the singularity, but also a local flow on that manifold which solves the DAE.

Place, publisher, year, edition, pages
2004. Vol. 17, no 1, 253-279 p.
National Category
Mathematics
Identifiers
URN: urn:nbn:se:kth:diva-45893DOI: 10.1088/0951-7715/17/1/015ISI: 000188597100016Scopus ID: 2-s2.0-0346671217OAI: oai:DiVA.org:kth-45893DiVA: diva2:453173
Note
QC 20111101Available from: 2011-11-01 Created: 2011-11-01 Last updated: 2017-12-08Bibliographically approved

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