@incollection{PickenhainKloetzler, author = {Pickenhain, Sabine and Kl{\"o}tzler, Rolf}, title = {Pontryagin's maximum principle for multidimensional control problems}, series = {Optimal control, Conference on Optimal Control, held at the Mathematisches Forschungsinstitut of the University of Freiburg}, booktitle = {Optimal control, Conference on Optimal Control, held at the Mathematisches Forschungsinstitut of the University of Freiburg}, editor = {Bulirsch, Roland}, publisher = {Birkh{\"a}user}, address = {Basel [u.a.]}, isbn = {0-8176-2887-8}, pages = {21 -- 30}, language = {en} } @incollection{Pickenhain, author = {Pickenhain, Sabine}, title = {W{\"a}lzlagerrollen - L{\"o}cher - Orbiformen}, series = {Heureka heute : Kostproben praxiswirksamer Mathematik}, booktitle = {Heureka heute : Kostproben praxiswirksamer Mathematik}, editor = {Deweß, G{\"u}nter}, publisher = {Teubner}, address = {Stuttgart [u.a.]}, isbn = {3-8154-2071-7}, pages = {122 -- 133}, language = {de} } @article{PickenhainWagner, author = {Pickenhain, Sabine and Wagner, Marcus}, title = {Piecewise Continuous Controls in Dieudonn{\´e}-Rashevsky Type Problems}, language = {en} } @incollection{PickenhainMalanowskiMaurer, author = {Pickenhain, Sabine and Malanowski, Kazimierz and Maurer, Helmut}, title = {Second order sufficient conditions for optimal control subject to first order state constraints}, series = {Control and boundary analysis}, booktitle = {Control and boundary analysis}, editor = {Cagnol, John}, publisher = {Chapman \& Hall/CRC}, address = {Boca Raton, Fla}, isbn = {978-1-574-44594-7}, pages = {293 -- 304}, language = {en} } @incollection{PickenhainLykina, author = {Pickenhain, Sabine and Lykina, Valeriya}, title = {Sufficiency conditions for infinite horizon optimal control problems}, language = {en} } @article{PickenhainWagner, author = {Pickenhain, Sabine and Wagner, Marcus}, title = {Minimizing sequences in class-qualified deposit problems}, language = {en} } @misc{PickenhainLykinaWagner, author = {Pickenhain, Sabine and Lykina, Valeriya and Wagner, Markus}, title = {On the lower semicontinuity of functionals involving Lebesgue or improper Riemann integrals in infinite horizon optimal control problems}, series = {Control and Cybernetics}, volume = {37}, journal = {Control and Cybernetics}, issn = {0324-8569}, pages = {451 -- 468}, language = {en} } @article{LykinaPickenhainWagner, author = {Lykina, Valeriya and Pickenhain, Sabine and Wagner, M.}, title = {Different interpretations of the improper integral objective in an infinite horizon control problem}, language = {en} } @article{LykinaPickenhainWagner, author = {Lykina, Valeriya and Pickenhain, Sabine and Wagner, M.}, title = {On a resource allocation model with inifinite horizon}, language = {en} } @incollection{Pickenhain, author = {Pickenhain, Sabine}, title = {On adequate transversality conditions for infinite horizon optimal control problems}, language = {en} } @incollection{Pickenhain, author = {Pickenhain, Sabine}, title = {On infinite horizon optimal control of a Lotka-Voltera-System}, series = {Recent Advances in Optimization and its Applications in Engineering : The 14th Belgian-French-German Conference on Optimization}, booktitle = {Recent Advances in Optimization and its Applications in Engineering : The 14th Belgian-French-German Conference on Optimization}, publisher = {Springer}, address = {Berlin [u.a.]}, isbn = {978-3-642-12598-0}, pages = {277 -- 286}, language = {en} } @book{Pickenhain, author = {Pickenhain, Sabine}, title = {On adequate transversality conditions for infinite horizon optimal control problems}, publisher = {Cottbus : BTU, Math. Inst.}, language = {en} } @incollection{Pickenhain, author = {Pickenhain, Sabine}, title = {Hilbert space treatment of optimal control problems with infinite horizon}, series = {Modeling, Simulation and Optimization of Complex Processes - HPSC 2012}, booktitle = {Modeling, Simulation and Optimization of Complex Processes - HPSC 2012}, publisher = {Springer-Verlag}, address = {Heidelberg [u.a.]}, isbn = {978-3-319-09062-7}, doi = {10.1007/978-3-319-09063-4}, pages = {169 -- 182}, language = {en} } @incollection{WenzkeLykinaPickenhain, author = {Wenzke, Diana and Lykina, Valeriya and Pickenhain, Sabine}, title = {State and Time Transformations of Infinite Horizon Optimal Control Problems}, series = {Variational and Optimal Control Problems on Unbounded Domains (AMS)}, booktitle = {Variational and Optimal Control Problems on Unbounded Domains (AMS)}, publisher = {American Mathematical Society (AMS)}, address = {Providence, RI}, isbn = {978-1-4704-1077-3}, pages = {189 -- 208}, language = {en} } @misc{Pickenhain, author = {Pickenhain, Sabine}, title = {Infinite Horizon Optimal Control Problems in the Light of Convex Analysis in Hilbert Spaces}, series = {Set-Valued and Variational Analysis}, volume = {23}, journal = {Set-Valued and Variational Analysis}, number = {1}, issn = {1877-0533}, doi = {10.1007/s11228-014-0304-5}, pages = {169 -- 189}, abstract = {In this paper a class of linear-quadratic infinite horizon optimal control problems is considered. Problems of this type are not only of practical interest. They also appear as an approximation of nonlinear problems. The key idea is to introduce weighted Sobolev spaces as state space and weighted Lebesgue spaces as control spaces into the problem setting. We investigate the question of existence of an optimal solution in these spaces and establish a Pontryagin type Maximum Principle as a necessary optimality condition including transversality conditions.}, language = {en} } @misc{PickenhainBurtchenKoloetal., author = {Pickenhain, Sabine and Burtchen, Angie and Kolo, Katharina and Lykina, Valeriya}, title = {An indirect pseudospectral method for the solution of linear-quadratic optimal control problems with infinite horizon}, series = {Optimization}, volume = {65}, journal = {Optimization}, number = {3}, issn = {0233-1934}, doi = {10.1080/02331934.2015.1014481}, pages = {609 -- 633}, language = {en} } @techreport{WenzkePickenhain, author = {Wenzke, Diana and Pickenhain, Sabine}, title = {Transformation of Infinite Horizon Optimal Control Problems}, publisher = {Mathematisches Institut}, address = {Cottbus}, pages = {16 Blatt}, abstract = {We consider classes of infinite horizon optimal control problems as optimization problems in Hilbert spaces. For typical examples it is pointed out that the state and control variables belong to Weighted Sobolev - and Lebesgue spaces respectively. The main purpose of this paper is to demonstrate that necessary optimality conditions as the core relation,[1], or a Pontryagin type Maximum Principle including transversality conditions,[19], depend on transformations. Firstly, it is shown that a discount rate can be generated by a transformation. Secondly,a transformation of the infinite horizon problem onto a finite fixed horizon problem generates singularities in the data of the problems or in the optimal solution. Thus standard existence results and necessary optimality conditions,[10], can not be applied for the transformed problem. But results obtained for the infinite horizon problem can be transformed into these for the finite horizon problem.}, language = {en} } @inproceedings{PickenhainLykina, author = {Pickenhain, Sabine and Lykina, Valeriya}, title = {Budget-Constrained Infinite horizon Optimal Control Problems with Linear Dynamics}, series = {55th IEEE Conference on Decision and Control, Las Vegas}, booktitle = {55th IEEE Conference on Decision and Control, Las Vegas}, publisher = {IEEE}, address = {Piscataway, NJ}, isbn = {978-1-5090-1837-6}, doi = {10.1109/CDC.2016.7798543}, pages = {1906 -- 1911}, language = {en} } @inproceedings{BurtchenPickenhainMaurer, author = {Burtchen, Angie and Pickenhain, Sabine and Maurer, Helmut}, title = {Numerical Treatment of the Optimal Energy Control Problem of Hybrid Vehicles}, series = {IEEE 55th Conference on Decision and Control (CDC], December 12-14, 2016, Las Vegas}, booktitle = {IEEE 55th Conference on Decision and Control (CDC], December 12-14, 2016, Las Vegas}, isbn = {978-1-5090-1837-6}, doi = {10.1109/CDC.2016.7799409}, pages = {7377 -- 7383}, language = {en} } @misc{PickenhainLykina, author = {Pickenhain, Sabine and Lykina, Valeriya}, title = {Weighted functional spaces approach in infinite horizon optimal control problems: A systematic analysis of hidden opportunities and advantages}, series = {Journal of Mathematical Analysis and Applications}, volume = {454}, journal = {Journal of Mathematical Analysis and Applications}, number = {1}, issn = {0022-247X}, pages = {195 -- 218}, language = {en} } @misc{PickenhainLykina, author = {Pickenhain, Sabine and Lykina, Valeriya}, title = {Pontryagin Type Maximum Principle for budget-constrained infinite horizon optimal control problems with linear dynamics}, series = {Journal of Mathematical Analysis and Applications}, volume = {457}, journal = {Journal of Mathematical Analysis and Applications}, number = {2}, issn = {0022-247X}, pages = {1591 -- 1612}, language = {en} } @incollection{PickenhainBurtchen, author = {Pickenhain, Sabine and Burtchen, Angie}, title = {Optimal Energy Control of Hybrid Vehicles}, series = {Modeling, Simulation and Optimization of Complex Processes HPSC 2015}, booktitle = {Modeling, Simulation and Optimization of Complex Processes HPSC 2015}, publisher = {Springer}, address = {Cham}, isbn = {978-3-319-67167-3}, doi = {10.1007/978-3-319-67168-0_15}, pages = {179 -- 188}, abstract = {In recent years route planning has been greatly facilitated by car navigation systems. The desire for resource-efficient traveling has increased, a fact that is reflected by a higher demand for hybrid vehicles. The combination of electric motor and combustion engine adapted to the specific driving situation clearly reduces fuel consumption in comparison to vehicles with a conventional combustion engine. Up to this point, despite the fact that energy consumption and travel time are significantly affected by the drivers individual driving style, the driver has mainly been excluded. The aim of this project is to develop a dynamic model to calculate the optimal power train control—including the route planning. Taking into account the maximum travel time of the entire travel route in combination with energy-minimized driving, this approach allows us to obtain a new powerful concept. We present the model and its formulation as an optimal control problem, as well as some numerical results.}, language = {en} } @techreport{Pickenhain, author = {Pickenhain, Sabine}, title = {Infinite Horizon Problems in the Calculus of Variations - The Role of Transformations with an Application to the Brachistochrone Problem}, publisher = {Brandenburgische Technische Universit{\"a}t, Mathematisches Institut}, address = {Cottbus ; Senftenberg}, pages = {24}, abstract = {In this paper we consider a class of infinite horizon variational problems resulting from a transformation of singular variational problems. Herein we assume that the objective is convex. The problem setting implies a weighted Sobolev space as state space. For this class of problems we establish necessary optimality conditions in form of a Pontryagin type maximum principle. A duality concept of convex analysis is provided and used to establish sufficient optimality conditions. We apply the theoretical results proven to the problem of the Brachistochrone.}, language = {en} } @techreport{PickenhainLykina, author = {Pickenhain, Sabine and Lykina, Valeriya}, title = {Pontryagin Type Maximum Principle for Budget-Constrained Infinite Horizon Optimal Control Problems with Linear Dynamics}, publisher = {Brandenburgische Technische Universit{\"a}t, Mathematisches Institut}, address = {Cottbus-Senftenberg}, pages = {22}, abstract = {In this paper a class of infinite horizon optimal control problems with an isoperimetrical constraint, also interpreted as a budget constraint, is considered. Herein a linear both in the state and in the control dynamic is allowed. The problem setting includes a weighted Sobolev space as the state space. For this class of problems, we establish the necessary optimality conditions in form of a Pontryagin Type Maximum Principle including a transversality condition. The proved theoretical result is applied to a linear-quadratic regulator problem.}, language = {en} } @misc{PickenhainZiemann, author = {Pickenhain, Sabine and Ziemann, Torsten}, title = {First-order necessary optimality conditions for infinite horizon optimal control problems with linear dynamics and convex objective}, series = {Optimization : a Journal of Mathematical Programming and Operations Research}, volume = {67}, journal = {Optimization : a Journal of Mathematical Programming and Operations Research}, number = {6}, issn = {1029-4945}, doi = {10.1080/02331934.2018.1434172}, pages = {757 -- 782}, abstract = {We consider a class of infinite horizon optimal control problems with vector-valued states and controls involving the Lebesgue integral in the objective and a linear dynamics. The key idea is to show that the solutions of the state-equation belong to a weighted Hilbert space, due to a natural growth condition. This allows to introduce the weighted Sobolev space as the state space and the weighted Lebesgue space as the control space in the problem setting. We answer the fundamental question of how one can choose the weight function in dependence of the system dynamics. In the setting of Hilbert spaces, we show a Pontryagin-type maximum principle. Therefore, we use techniques from earlier publications of the authors. In contrast to these publications, we deal with vector-valued states and controls, here. These vector-valued problems arise in many applications. The maximum principle also includes a transversality condition which makes the difference to related publications in the field of necessary optimality conditions. This condition brings advantages for the numerical calculations of the solution by indirect methods, like a pseudospectral method.}, language = {en} } @misc{Pickenhain, author = {Pickenhain, Sabine}, title = {Infinite Horizon Problems in the Calculus of Variations. The Role of Transformations with an Application to the Brachistochrone Problem}, series = {Set-Valued and Variational Analysis Theory and Applications}, volume = {27}, journal = {Set-Valued and Variational Analysis Theory and Applications}, number = {2}, issn = {1877-0541}, doi = {10.1007/s11228-018-0483-6}, pages = {331 -- 354}, abstract = {In this paper we consider a class of infinite horizon variational problems resulting from a transformation of singular variational problems. Herein we assume that the objective is convex. The problem setting implies a weighted Sobolev space as state space. For this class of problems we establish necessary optimality conditions in form of a Pontryagin type maximum principle. A duality concept of convex analysis is provided and used to establish sufficient optimality conditions. We apply the theoretical results proven to the problem of the Brachistochrone.}, language = {en} } @misc{PickenhainBurtchen, author = {Pickenhain, Sabine and Burtchen, Angie}, title = {Regulator Problems on Unbounded Domains : Stationarity-Optimal Control-Asymptotic Controllability}, series = {Vietnam Journal of Mathematics}, volume = {46}, journal = {Vietnam Journal of Mathematics}, number = {4}, issn = {2305-2228}, doi = {10.1007/s10013-018-0304-0}, pages = {837 -- 861}, abstract = {In this paper, we consider a class of infinite horizon variational and control problems arising from economics, quantum mechanics, and stabilization. Herein, we assume that the objective is of regulator type. The problem setting implies a weighted Sobolev space as the state space. For this class of problems, we establish necessary optimality conditions in a form of a Pontryagin type maximum principle. A duality concept of convex analysis is provided and used to find sufficient optimality conditions and to motivate a dual approximation scheme. We apply the theoretical results to find an asymptotically stabilizing control for a linearized Lotka-Volterra type system.}, language = {en} } @misc{PickenhainBurtchen, author = {Pickenhain, Sabine and Burtchen, Angie}, title = {Problems in the Calculus of Variations on Unbounded Intervals—Fourier-Laguerre Analysis and Approximations}, series = {Vietnam Journal of Mathematics}, volume = {47}, journal = {Vietnam Journal of Mathematics}, number = {3}, issn = {2305-221X}, doi = {10.1007/s10013-019-00349-3}, pages = {617 -- 638}, abstract = {In this paper, we consider a class of variational problems on an unbounded interval of the real axis. This type of problems arises, e.g., in quantum mechanics and asymptotic controllability. The problem is treated in a Hilbert space setting with uniformly and non-uniformly weighted Sobolev spaces as state spaces. We provide sufficient conditions that a function from a weighted Sobolev space can be expanded into a Fourier-Laguerre series converging together with its distributional derivative pointwisely and uniformly. With this result, the considered variational problem is transformed into a problem in the sequence space of Fourier-Laguerre coefficients. We develop a Fourier-Laguerre method in these spaces in order to construct a polynomial approximation scheme for the solution of this problem.}, language = {en} }