Separation principle for a class of nonlinear systems augmented with observers
2008 (English)In: Proceeding of the 17th IFAC Congress, 2008, 6196-6201 p.Conference paper (Refereed)
The paper suggests conditions for presence of quadratic Lyapunov functions for nonlinear observer based feedback systems with an ’input nonlinearity’ in the feedback path. Provided that the system using state feedback satisfies the circle criterion (i.e., when all states can be measured), we show that stability of the extended system with output feedback control from a (full state) Luenberger-type observer may be concluded using the circle criterion. As another result, we state a separation principle for a class of feedback systems with an input nonlinearity.When only local stability results can be stated, our method provides an estimate of the region of attraction.
Place, publisher, year, edition, pages
2008. 6196-6201 p.
IdentifiersURN: urn:nbn:se:umu:diva-20110OAI: oai:DiVA.org:umu-20110DiVA: diva2:208160