Exponential Stability of Homogeneous Positive Systems of Degree One With Time-Varying Delays
2014 (English)In: IEEE Transactions on Automatic Control, ISSN 0018-9286, E-ISSN 1558-2523, Vol. 59, no 6, 1594-1599 p.Article in journal (Refereed) Published
While the asymptotic stability of positive linear systems in the presence of bounded time delays has been thoroughly investigated, the theory for nonlinear positive systems is considerably less well-developed. This paper presents a set of conditions for establishing delay-independent stability and bounding the decay rate of a significant class of nonlinear positive systems which includes positive linear systems as a special case. Specifically, when the time delays have a known upper bound, we derive necessary and sufficient conditions for exponential stability of (a) continuous-time positive systems whose vector fields are homogeneous and cooperative, and (b) discrete-time positive systems whose vector fields are homogeneous and order-preserving. We then present explicit expressions that allow us to quantify the impact of delays on the decay rate and show that the best decay rate of positive linear systems that our bounds provide can be found via convex optimization. Finally, we extend the results to general linear systems with time-varying delays.
Place, publisher, year, edition, pages
2014. Vol. 59, no 6, 1594-1599 p.
cooperative system, exponential stability, homogeneous system, positive system, time-varying delay
Research subject Electrical Engineering
IdentifiersURN: urn:nbn:se:kth:diva-147998DOI: 10.1109/TAC.2013.2292739ISI: 000337134000017ScopusID: 2-s2.0-84901405909OAI: oai:DiVA.org:kth-147998DiVA: diva2:733877
FunderSwedish Research Council
QC 201407142014-07-112014-07-112014-07-14Bibliographically approved