Free time optimal control problems with time delays

Abstract : Solutions to optimal control problems for retarded systems, on a fixed time interval, satisfy a form of the Maximum Principle, in which the co-state equation is an advanced differential equation. In this paper we present an extension of this well-known necessary condition of optimality, to cover situations in which the data is non-smooth, and the final time is free. The fact that the end-time is a choice variable is accommodated by an extra transversality condition. A traditional approach to deriving this extra condition is to reduce the free end-time problem to a fixed end-time problem by a parameterized change of the time variable. This approach is problematic for time delay problems because it introduces a parameter dependent time-delay that is not readily amenable to analysis; to avoid this difficulty we instead base our analysis on direct perturbation of the end-time. Formulae are derived for the gradient of the minimum cost as a function of the end-time. It is shown how these formulae can be exploited to construct two-stage algorithms for the computation of solutions to optimal retarded control problems with free-time, in which a sequence of fixed time problems are solved by means of Guinn's transformation, and the end-time is adjusted according to a rule based on the earlier derived gradient formulae for the minimum cost function. Numerical examples are presented.
Type de document :
Communication dans un congrès
52nd IEEE Control and Decision Conference (CDC), 2013, Florence, Italy. pp.520 - 525, 2013, Proceedings of the IEEE 52nd Annual Conference on Decision and Control (CDC). 〈10.1109/CDC.2013.6759934〉
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Contributeur : Estelle Bouzat <>
Soumis le : mardi 23 septembre 2014 - 14:52:16
Dernière modification le : lundi 12 février 2018 - 14:24:05

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Andrea Boccia, Franco Rampazzo. Free time optimal control problems with time delays. 52nd IEEE Control and Decision Conference (CDC), 2013, Florence, Italy. pp.520 - 525, 2013, Proceedings of the IEEE 52nd Annual Conference on Decision and Control (CDC). 〈10.1109/CDC.2013.6759934〉. 〈hal-01067476〉

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