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Explicit periodic solutions in a model of a relay controller with delay and forcing

David A W Barton et al 2005 Nonlinearity 18 2637-2656   doi: 10.1088/0951-7715/18/6/012  Help

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David A W Barton, Bernd Krauskopf and R Eddie Wilson
Bristol Centre for Applied Nonlinear Mathematics, Department of Engineering Mathematics, University of Bristol, Queen's Building, Bristol, BS8 1TR, UK

Recommended by M P Brenner

Abstract. In this paper we use a combination of numerical and analytical methods to find and construct solutions of a cameo model of relay control, formulated as a piecewise-constant delay differential equation (DDE). Numerical solutions of a related equation, where the discontinuities of the original DDE are smoothed out, are used to guide the construction of explicit solutions of the original DDE. On the other hand, the construction of explicit solutions provides starting data for numerical continuation of the smoothed equation. The stability of the explicit solutions can also be inferred from the numerical approach.

Mathematics Subject Classification: 34K13, 34K28, 34K35

Print publication: Issue 6 (November 2005)
Received 22 October 2004, in final form 8 August 2005
Published 16 September 2005

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