Journal ArticleDOI
A Parabolic Control Problem with a Boundary Condition of the Stefan‐Boltzmann Type
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In this paper, the authors consider a nonlinear boundary control problem with a boundary condition governed by the Stefan Boltzmann law and prove the existence and uniqueness of non-negative solutions.Abstract:
In this paper we consider a one-dimensional nonlinear boundary control problem occuring in heat conduction with a boundary condition governed by the Stefan-Boltzmann law. For L∞-inputs we prove the existence and uniqueness of non-negative solutions. Furthermore we show for a class of cost functionals that there exist optimal controls. We also give necessary conditions for optimal controls in form of a certain type of bang-bang-principle.
In dieser Arbeit betrachten wir ein eindimensionales nichtlineares Rand-Steuerungsproblem, das in der Warmeleitung mit einer Randbedingung nach dem Stefan-Boltzmann-Gesetz auftritt. Wir beweisen die Existenz und Eindeutigkeit stetiger nicht-negativer Losungen fur L∞-Eingaben. Weiterhin zeigen wir fur eine Klasse von Zielfunktionalen, das optimale Steuerungen existieren. Wir geben auch notwendige Bedingungen fur optimale Steuerungen an in Form eines speziellen Bang-Bang-Prinzips.read more
Citations
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A unified theory of necessary conditions for nonlinear nonconvex control systems
TL;DR: In this article, the authors considered optimal problems for a general nonlinear nonconvex input-output relation for Banach space valued functions and obtained a maximum principle using Ekeland's variational principle.
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Second-order sufficient optimality conditions for a class of nonlinear parabolic boundary control problems
H. Goldberg,Fredi Tröltzsch +1 more
TL;DR: In this article, sufficient second-order optimality conditions are established for parabolic boundary control problems with nonlinear boundary condition and constraints on the control and the state, by means of a semigroup approach and a two-norm technique.
Journal ArticleDOI
Global Convergence of Trust-region Interior-point Algorithms for Infinite-dimensional Nonconvex Minimization Subject to Pointwise Bounds
TL;DR: In this paper, interior-point trust-region algorithms for infinite-dimensional nonlinear optimization subject to pointwise bounds in L p-Banach spaces, where the problem formulation is motivated by optimal control problems with L p -controls and pointwise control constraints.
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Superlinear Convergence of Affine-Scaling Interior-Point Newton Methods for Infinite-Dimensional Nonlinear Problems with Pointwise Bounds
Michael Ulbrich,Stefan Ulbrich +1 more
TL;DR: A superlinearly convergent affine-scaling interior-point Newton method for infinite-dimensional problems with pointwise bounds in Lp-space is developed and it is demonstrated in an example that a stepsize rule to obtain an interior iterate may require very small stepsizes even arbitrarily close to a nondegenerate solution.
References
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Unicité du prolongement des solutions pour quelques opérateurs différentiels paraboliques
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W. I. Smirnow, Lehrgang der Höheren Mathematik, Teil V. XIII + 569 S. m. 3 Abb. Berlin 1962. VEB Deutscher Verlag der Wissenschaften. Preis geb. DM 36,—
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Some problems in the theory of optimal control
TL;DR: In this article, the authors consider the problem of optimal control of a rod when the temperature of the external medium can be controlled within definite limits, i.e., the temperature must be as close to the given temperature as possible.
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On a certain nonlinear integral equation of the Volterra type.
J. H. Roberts,W. R. Mann +1 more