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Optimality and sensitivity for semilinear bang-bang type optimal control problems
International Journal of Applied Mathematics and Computer Science, Tome 14 (2004) no. 4, pp. 447-454.

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In optimal control problems with quadratic terminal cost functionals and systems dynamics linear with respect to control, the solution often has a bang-bang character. Our aim is to investigate structural solution stability when the problem data are subject to perturbations. Throughout the paper, we assume that the problem has a (possibly local) optimum such that the control is piecewise constant and almost everywhere takes extremal values. The points of discontinuity are the switching points. In particular, we will exclude the so-called singular control arcs, see Assumptions 1 and 2, Section 2. It is known from the results by Agrachev et al. (2002) stating that regularity assumptions, together with a certain strict second-order condition for the optimization problem formulated in switching points, are sufficient for strong local optimality of a state-control solution pair. This finite-dimensional problem is analyzed in Section 3 and optimality conditions are formulated (Lemma 2). Using well-known results concerning solution sensitivity for mathematical programs in Rn (Fiacco, 1983) one may further conclude that, under parameter changes in the problem data, the switching points will change Lipschitz continuously. The last section completes these qualitative statements by calculating sensitivity differentials (Theorem 2, Lemma 6). The method requires a simultaneous solution of certain linearized multipoint boundary value problems.
Keywords: bang-bang control, optimality conditions, sensitivity differentials, solution structure, stability in optimal control, strong local optima
Mots-clés : sterowanie optymalne, struktura roztworu, warunki optymalności 
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Felgenhauer, U. Optimality and sensitivity for semilinear bang-bang type optimal control problems. International Journal of Applied Mathematics and Computer Science, Tome 14 (2004) no. 4, pp. 447-454. http://geodesic.mathdoc.fr/item/IJAMCS_2004_14_4_a0/

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