Publikationen

2008

• Arrangements for enhanced measurements of a large turbine near-wake using LiDAR from the nacelle

  Trujillo, J. J., Rettenmeier, A., & Schlipf, D. (2008). Arrangements for enhanced measurements of a large turbine near-wake using LiDAR from the nacelle. In IOP Conference Series: Earth and Environmental Science (Bd. 1). http://doi.org/10.1088/1755-1315/1/1/012060 (Original work published 2026)

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    • Schlipf, David

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  • 2008
  • Conference Paper
  • • Juan Trujillo
    • Andreas Rettenmeier
    • David Schlipf

• The active guidance module of a rail-bound vehicle as an application of dependability oriented design in self-optimizing systems

  Sondermann-Wölke, C., Geisler, J., Müller, T., Trächtler, A., & Böcker, J. (2008). The active guidance module of a rail-bound vehicle as an application of dependability oriented design in self-optimizing systems. In Proceedings of the ASME 2008 - International Design Engineering Technical Conferences & Computers and Information in Engineering Conference (IDETC/CIE). New York. (Original work published August 2008)

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    • Geisler, Jens

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  • 2008
  • Conference Paper
  • • Christoph Sondermann-Wölke
    • Jens Geisler
    • T. Müller
    • A. Trächtler
    • J. Böcker

• Multiobjective Optimization of Control Trajectories for the Guidance of a Rail-Bound Vehicle

  Geisler, J., Witting, K., Trächtler, A., & Dellnitz, M. (2008). Multiobjective Optimization of Control Trajectories for the Guidance of a Rail-Bound Vehicle. In Proceedings of the 17th IFAC World Congress. Seoul, Korea. http://doi.org/10.3182/20080706-5-KR-1001.00738 (Original work published Juli 2008)

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  Self-optimization refers to the ability of a mechatronic system to autonomously adapt the way it performs its functions to changing environmental and operational conditions or user demands. In this work we propose to use multiobjective optimal control to enable the self-optimization of the guidance of a rail-bound vehicle. We consider different strategies to reduce the computational cost of the optimization. Most importantly, a two-degree-of-freedom controller is used to separate optimal trajectory generation from disturbance compensation. Also, in order to solve the multiobjective optimization problem, an approximation of the entire set of optimal compromises of the objectives, the so-called Pareto set, is computed offline at design time. From this, we can derive a collection of weighting vectors that capture the best trade-off between the objectives for different situations. Given this set of preselected weights, for the online optimization, the objective function can be taken to be a weighted sum that best matches the situation at hand. For the guidance system we consider three objectives. Preliminary offline simulation results are presented.

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    • Geisler, Jens

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  • 2008
  • Conference Paper
  • • Jens Geisler
    • K. Witting
    • A. Trächtler
    • M. Dellnitz

• Wachsende Bedeutung der Offshore-Windenergie

  Faber, P. D.-I. T. (2008). Wachsende Bedeutung der Offshore-Windenergie. Schiff&Hafen, 3, 2. (Original work published März 2008)

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    • Faber, Torsten

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  • 2008
  • Journal Article
  • • Prof. Dr.-Ing. Torsten Faber

• Untersuchungen zu Resonant Commutated Pole Kommutierungszellen in Spannungs- und Stromzwischenkreis-Umrichtern

  Hinrichsen, F. (2008). Untersuchungen zu Resonant Commutated Pole Kommutierungszellen in Spannungs- und Stromzwischenkreis-Umrichtern (S. 192). Göttingen: Cuvillier Verlag. (Original work published März 2008)

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  In the last years pulse-controlled inverters using Insulated Gate Bipolar Tran sistors (IGBTs) have reached an outstanding position in the field of motor control and energy distribution. The power losses of the IGBTs can be lowered by the use of resonant techniques also called soft switching techniques. Hence it is possible to reduce cooling efforts, to raise switching frequency or to increase efficiency. In most cases the aim is an one-to-one replacement of the hard swit ched inverter. The Auxiliary Resonant Commutated Pole Inverter (ARCPI) has become a promising candidate to reach this aim, however, even this topology has got some drawbacks, e.g. balancing problems with the capacitive voltage divider in the DC link. This thesis starts with an excursus in the technology of modern power semi conductors in consideration of silicon carbide as a new base material. Subse quently a review of the most important resonant converter structures follows including a proposal for a structured method for their classification. Theoretical and experimental analysis of a total of four Resonant Commuta ted Pole commutation cells is done. The starting point is the classic voltage fed ARCPI. Results achieved in an optimised test set-up of a 1MVA converter for a motor-generator of a flywheel storage system are summarised. The three-phase current source ARCPI only needs two auxiliary switches. Therefore and due to the reason, that its capacitive voltage divider is easily stabilised by connecting it to the star point of the load, this solution is particularly attractive. Hence a three-phase inverter is built and measured. A new commutation cell, the so called Resonant Commutated Twin Pole (RCTP) cell, is derived using the laws of network theory. Its functionality is proved in a single-phase setup connected to a current source. The more promising voltage fed RCTP cell is examined in a three-phase inverter. All phases are realised using different technologies. Power losses in hard and soft switched mode with and without silicon carbide diodes are directly compared to each other. The theses is concluded by an appraisal of the new concept and by an outlook to possible realisations.

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  • 2008
  • Book
  • • Frank Hinrichsen

• Self-Optimization of the Guidance Module of a Rail-bound Vehicle

  Geisler, J., Witting, K., Trächtler, A., & Dellnitz, M. (2008). Self-Optimization of the Guidance Module of a Rail-bound Vehicle. In Self-optimizing Mechatronic Systems: Designing the Future (7th International Heinz Nixdorf Symposium). Paderborn: HNI-Verlagsschriftenreihe. Abgerufen von https://www.hni.uni-paderborn.de/pub/5674 (Original work published Februar 2008)

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    • Geisler, Jens

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  • 2008
  • Conference Paper
  • • Jens Geisler
    • K. Witting
    • A. Trächtler
    • M. Dellnitz

• The impact of time controlled reading on software inspection effectiveness and efficiency: a controlled experiment

  Petersen, K., Rönkkö, K., & Wohlin, C. (2008). The impact of time controlled reading on software inspection effectiveness and efficiency: a controlled experiment. In Proceedings of the Second ACM-IEEE international symposium on Empirical software engineering and measurement (S. 139–148).

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    • Petersen, Kai

  • Abteilung/Einrichtung

    • FLAIR - Flensburg Artificial Intelligence Research

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  • 2008
  • Conference Paper
  • • Kai Petersen
    • Kari Rönkkö
    • Claes Wohlin

• Quantifizierung von Wertbeiträgen aus Änderungen von Supply Chain Kosten und Working Capital

  Brandenburg, M., & Menke, T. (2008). Quantifizierung von Wertbeiträgen aus Änderungen von Supply Chain Kosten und Working Capital . Zeitschrift für Controlling und Management, 3, 168–174. http://doi.org/10.1007/s12176-008-0048-x

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    • Brandenburg, Marcus

  • Fachbereich

    • Fachbereich 4: Wirtschaft

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  • 2008
  • Journal Article
  • • Marcus Brandenburg
    • Torben Menke

• Exploiting the pharmaceutical potential of Marine Microorganisms

  Gärtner, A., Krämer, M., Kajahn, I., Labes, A., Nagel, K., Stöhr, R., … Imhoff, J. F. (2008). Exploiting the pharmaceutical potential of Marine Microorganisms. XXX. Congreso Chileno de Microbiolog\ ia. Abgerufen von http://oceanrep.geomar.de/6763/

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  • 2008
  • Unpublished
  • • Andrea Gärtner
    • Marco Krämer
    • Inga Kajahn
    • Antje Labes
    • Kerstin Nagel
    • Rüdiger Stöhr
    • Rolf Schmaljohann
    • Imke Schneemann
    • Vera Thiel
    • Jutta Wiese
    • Johannes Imhoff
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• EasyCheck — Test Data for Free

  Christiansen, J., & Fischer, S. (2008). EasyCheck — Test Data for Free. In Functional and Logic Programming (S. 322–336). Springer Berlin Heidelberg.

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  We present a lightweight, automated tool for specification-based testing of declarative programs written in the functional logic programming language Curry and emphasize the usefulness of logic features in its implementation and use. Free variables, nondeterminism and encapsulated search turn out to be elegant and powerful means to express test-data generation.

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    • Christiansen, Jan

  • Fachbereich

    • Fachbereich 3: Information und Kommunikation

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  • 2008
  • Conference Paper
  • • Jan Christiansen
    • Sebastian Fischer