Publikationen am Fachgebiet

Results: 124
Created on: Fri, 26 Jul 2024 23:14:26 +0200 in 0.2483 sec


Ioan, Daniel-Mihail; Stoican, Florin; Worthmann, Karl
Active fault detection and isolation in a zonotopic framework. - In: 2017 21st International Conference on System Theory, Control and Computing (ICSTCC), ISBN 978-1-5386-3842-2, (2017), S. 595-600

https://doi.org/10.1109/ICSTCC.2017.8107100
Bergmann, Jean Pierre; Bielenin, Martin; Herzog, Roland A.; Hildebrand, Jörg; Riedel, Ilka; Schricker, Klaus; Trunk, Carsten; Worthmann, Karl
Prevention of solidification cracking during pulsed laser beam welding. - Ilmenau : Technische Universität, Institut für Mathematik, 2017. - 1 Online-Ressource (7 Seiten). - (Preprint ; M17,09)

We present a mathematical model to describe laser beam welding based on the heat equation. Since the material coeff cients depend on the temperature, this leads to a quasi-linear parabolic partial differential equation. It is our goal to prevent solidif cation cracking. We address this problem by means of optimal control. It is the intensity prof le of the laser beam which acts as the control function. The main challenge is the formulation of a suitable objective function. In particular, high velocities of the solidif cation interface need to be properly penalized in order to deal with and avoid cracking phenomena.



https://www.db-thueringen.de/receive/dbt_mods_00032771
Worthmann, Karl; Mehrez, Mohamed W.; Mann, George K. I.; Gosine, Raymond G.; Pannek, Jürgen
Interaction of open and closed loop control in MPC. - In: Automatica, ISSN 0005-1098, Bd. 82 (2017), S. 243-250

https://doi.org/10.1016/j.automatica.2017.04.038
Müller, Matthias A.; Worthmann, Karl
Quadratic costs do not always work in MPC. - In: Automatica, ISSN 0005-1098, Bd. 82 (2017), S. 269-277

https://doi.org/10.1016/j.automatica.2017.04.058
Proch, Michael; Worthmann, Karl; Schlüchtermann, Jörg
A negotiation-based algorithm to coordinate supplier development in decentralized supply chains. - In: European journal of operational research, ISSN 0377-2217, Bd. 256 (2017), 2, S. 412-429

http://dx.doi.org/10.1016/j.ejor.2016.06.029
Braun, Philipp; Faulwasser, Timm; Grüne, Lars; Kellett, Christopher M.; Weller, Steven R.; Worthmann, Karl
Maximal islanding time for microgrids via distributed predictive control. - In: 22nd International Symposium on Mathematical Theory of Networks and Systems, ISBN 978-1-5323-1358-5, (2016), S. 652-659

http://hdl.handle.net/11299/181518
Braun, Philipp; Grüne, Lars; Kellett, Christopher M.; Weller, Steven R.; Worthmann, Karl
Model predictive control of residential energy systems using energy storage and controllable loads. - In: Progress in Industrial Mathematics at ECMI 2014, (2016), S. 617-623

https://doi.org/10.1007/978-3-319-23413-7_85
Braun, Philipp; Grüne, Lars; Kellett, Christopher M.; Weller, Steven R.; Worthmann, Karl
A distributed optimization algorithm for the predictive control of smart grids. - In: IEEE transactions on automatic control, ISSN 1558-2523, Bd. 61 (2016), 12, S. 3898-3911

https://doi.org/10.1109/TAC.2016.2525808
Worthmann, Karl; Proch, Michael; Braun, Philipp; Schlüchtermann, Jörg; Pannek, Jürgen
Towards dynamic contract extension in supplier development. - In: Logistics research, ISSN 1865-0368, Bd. 9.2016, Article 14, insg. 12 Seiten

We consider supplier development within a supply chain consisting of a single manufacturer and a single supplier. Because investments in supplier development are usually relationship-specific, safeguard mechanisms against the hazards of partner opportunism have to be installed. Here, formal contracts are considered as the primary measure to safeguard investments. However, formal contracts entail certain risks, e.g., a lack of flexibility, particular in an ambiguous environment. We propose a receding horizon control scheme to mitigate possible contractual drawbacks while significantly enhancing the supplier development process and, thus, to increase the overall supply chain profit. Our findings are validated by a numerical case study.



http://hdl.handle.net/10419/157739
Worthmann, Karl; Mehrez, Mohamed W.; Zanon, Mario; Mann, George K. I.; Gosine, Raymond G.; Diehl, Moritz
Model predictive control of nonholonomic mobile robots without stabilizing constraints and costs. - In: IEEE transactions on control systems technology, ISSN 1558-0865, Bd. 24 (2016), 4, S. 1394-1406

http://dx.doi.org/10.1109/TCST.2015.2488589