@inproceedings{EllingerMeisterGrosaetal., author = {Ellinger, Frank and Meister, Tilo and Grosa, Patrick and Jamshidi, Kambiz and Ihle, David and Franchi, Norman and Wagner, Jens and Richter, Andreas and Fettweis, Gerhard and Fitzek, Frank and Kreissig, Martin and Klessig, Henrik and Kraemer, Rolf and Richter, Klaus and Frotzscher, Andreas and L{\"o}hr, Robert and Winkler, Wolfgang and Zoeke, Dominik and Carot, Alexander and Bluschke, Andreas}, title = {Project FAST - Fast Actuators Sensors \& Transceivers}, series = {Microwave Conference (LAMC), IEEE MTT-S Latin America, 12-14 Dec. 2016 Puerto Vallarta, Mexico}, booktitle = {Microwave Conference (LAMC), IEEE MTT-S Latin America, 12-14 Dec. 2016 Puerto Vallarta, Mexico}, publisher = {IEEE}, address = {Piscataway, NJ}, isbn = {978-1-5090-4287-6}, pages = {3}, language = {en} } @inproceedings{EickhoffTittelbachHelmrichWickertetal., author = {Eickhoff, Ralf and Tittelbach-Helmrich, Klaus and Wickert, Michael and Wagner, Jens and Mayer, Uwe and Elvira, Victor and Ib{\´a}{\~n}ez, Jes{\´u}s and Stamenković, Zoran and Ellinger, Frank}, title = {Physical Layer Amendments for MIMO Features in 802.11a}, language = {en} } @techreport{FeindtWoltersBackesetal., author = {Feindt, Peter H. and Wolters, Volkmar and Backes, Gunter and Bahrs, Enno and Dempfle, Leo and Engels, Eve-Marie and Engels, Johannes and Graner, Andreas and Hamm, Ulrich and Herdegen, Matthias and Isselstein, Johannes and Konnert, Monika and Schr{\"o}der, Stefan and Schulte-Coerne, Hermann and Wagner, Sven and W{\"a}tzold, Frank and Wedekind, Helmut}, title = {Gr{\"u}ndung der Deutschen Genbank landwirtschaftlicher Nutztiere : Kurzstellungnahme des Wissenschaftlichen Beirats f{\"u}r Biodiversit{\"a}t und Genetische Ressourcen beim Bundesministerium f{\"u}r Ern{\"a}hrung und Landwirtschaft}, publisher = {BMEL}, address = {Bonn}, pages = {10}, language = {de} } @techreport{WaetzoldBahrsFeindtetal., author = {W{\"a}tzold, Frank and Bahrs, Enno and Feindt, Peter H. and Hamm, Ulrich and Isselstein, Johannes and Schr{\"o}der, Stefan and Wolters, Volkmar and Backes, Gunter and Dempfle, Leo and Engels, Eve-Marie and Engels, Johannes and Graner, Andreas and Herdegen, Matthias and Konnert, Monika and Schulte-Coerne, Hermann and Wagner, Sven and Wedekind, Helmut}, title = {Perspektiven f{\"u}r das artenreiche Gr{\"u}nland - Alternativen zur Belohnung einer {\"U}berschussproduktion bei Milch}, address = {Bonn}, pages = {9}, language = {de} } @inproceedings{WagnerKuehhorn, author = {Wagner, Frank and K{\"u}hhorn, Arnold}, title = {Response surface based robust design optimization on the example of a high pressure turbine blade}, series = {8. Dresdner Probabilistik-Workshop, Technische Universit{\"a}t Dresden, 08.-09. Okt. 2015}, booktitle = {8. Dresdner Probabilistik-Workshop, Technische Universit{\"a}t Dresden, 08.-09. Okt. 2015}, address = {Dresden}, pages = {18}, abstract = {Nowadays in a product design process the manufacturing tolerances have to be considered. Therefore a deterministic optimization needs to be converted into a robust design optimization. Usually the reference geometry is represented by a parametric model and an appropriate set of default parameters. In the robust design approach this set is replaced by a set of distributed parameters. These distributions are known from a previous design or needs to be estimated. This work is about a robust design and multi objective optimization of a high pressure turbine blade (first row) from an actual aero engine. The multidisciplinary objectives are the combined life of the aero-foil (LCF and creep) for the outer and inner geometry, the efficiency and the mass of the blade. For the input set different kinds of parameter will be examined. Apart from the major geometry parameters, which represent the external surface of the blade, parameters for material and boundary conditions will be investigated as well. The used workflow contains the Rolls-Royce tool parablading for the creation of the external aero-foil, Siemens NX for general geometry manipulation, Hydra as Navier-Stokes solver and SC03 for the structural problem and is set up in the automation software ISight. Focus of this work is the creation of response surfaces and physical integrity of the delivered results. Therefore, different validation criteria will be consulted. These are implemented in a Matlab toolbox and tested on typical optimization test problems. Based on the validated response surfaces a huge number of evaluations is possible, which is necessary for a robust design optimization. As the major result a set of Pareto optimal designs will be delivered.}, language = {en} } @inproceedings{WagnerKuehhornParchem, author = {Wagner, Frank and K{\"u}hhorn, Arnold and Parchem, Roland}, title = {Robust design optimization applied to a high pressure turbine blade based on surrogate modelling techniques}, series = {ASME Turbo Expo 2015: Turbine Technical Conference and Exposition Volume 7A: Structures and Dynamics Montreal, Quebec, Canada, June 15-19, 2015}, booktitle = {ASME Turbo Expo 2015: Turbine Technical Conference and Exposition Volume 7A: Structures and Dynamics Montreal, Quebec, Canada, June 15-19, 2015}, isbn = {978-0-7918-5676-5}, doi = {10.1115/GT2015-42365}, abstract = {To achieve reverse objectives in engine design, advanced modelling and analysis methods are among the key research technologies. In the presented work, a robust design optimization of a first stage high pressure turbine blade has been carried out. This blade derives from a current production of a Rolls-Royce aero engine. The motivation of this work is to show that the methodology of robust design optimization can be applied to high pressure turbine blades. A fully automated workflow, which encapsulated the integral blade design and analysis process, has been used. The main workflow objective is a representative life value of the external surface of the blade. In addition, the workflow enables the engineering uses to consider sub objectives like mass, efficiency and life at critical locations of the blade. These can also be taken into account in the multi-objective robust design optimization. This research also focuses on the use of surrogate models, with attention to the delivery of a physically correct result. For this purpose, the validation of the applied methods has a huge significance and a toolbox was created to generate and evaluate the quality of the surrogate models. In the present case sixteen geometry parameters were considered. In order to show that this methodology is not limited to geometry variation, parameters for material specification and for boundary conditions were varied in addition. The surrogate model was trained by the workflow generated DoE-data and could be used for different kinds of optimization. As a conclusion, it has been demonstrated that the methodology can be used for the engineering design process of turbine blades, while delivering physically correct results. The different techniques for surrogate modelling were examined and compared. With the help of these surrogate models, an optimization of life, mass and efficiency with 22.5 million evaluations was possible. Finally, an overview of the methodology for the case of a real world turbine blade could be given, and an improved blade in the sense of multi-objective robust design was found. Copyright © 2015 by Rolls-Royce Deutschland Ltd \& Co KG}, language = {en} } @misc{WagnerKuehhornWeissetal., author = {Wagner, Frank and K{\"u}hhorn, Arnold and Weiss, Thomas and Otto, Dierk}, title = {Influence of different parametrizations on the optimum design of a high pressure turbine blade firtree}, series = {ASME Turbo Expo 2016, Turbomachinery Technical Conference and Exposition, Volume 7A, Structures and Dynamics, Seoul, South Korea, June 13-17, 2016}, journal = {ASME Turbo Expo 2016, Turbomachinery Technical Conference and Exposition, Volume 7A, Structures and Dynamics, Seoul, South Korea, June 13-17, 2016}, publisher = {ASME}, address = {New York, NY}, isbn = {978-0-7918-4983-5}, doi = {10.1115/GT2016-56749}, pages = {11}, abstract = {Today the design processes in the aero industry face many challenges. Apart from automation itself, a suitable parametric geometry setup plays a significant role in making workflows usable for optimization. At the same time there are tough requirements against the parametric model. For the lowest number of possible parameters, which should be intuitively ascertainable, a high flexibility has to be ensured. Within the parameter range an acceptable stability is necessary. Under these constraints the creation of such parametric models is a challenge, which should not be underestimated especially for a complex geometry. In this work different kinds of parametrization with different levels of complexity will be introduced and compared. Thereby several geometry elements will be used to handle the critical regions of the geometry. In the simplest case a combination of lines and arcs will be applied. These will be replaced by superior elements like a double arc construct or different formulations of b-splines. There will be an additional focus on the variation of spline degree and control points. To guarantee consistency a set of general parameters will be used next to the specific ones at the critical regions. The different parameter boundaries have a influence on the possible geometries and should therefore be tested separately before an optimization run.}, language = {en} } @techreport{FeindtWoltersBackesetal., author = {Feindt, Peter H. and Wolters, Volkmar and Backes, Gunter and Bahrs, Enno and Brandt, Horst and Dempfle, Leo and Engels, Eve-Marie and Engels, Johannes and Graner, Andreas and Hamm, Ulrich and Herdegen, Matthias and Isselstein, Johannes and Konnert, Monika and Schr{\"o}der, Stefan and Wagner, Sven and W{\"a}tzold, Frank and Wedekind, Helmut}, title = {Verbraucher f{\"u}r die Erhaltung der biologischen Vielfalt in der Landwirtschaft aktivieren!}, publisher = {Bundesanstalt f{\"u}r Landwirtschaft und Ern{\"a}hrung (BLE) Informations- und Koordinationszentrum f{\"u}r Biologische Vielfalt (IBV)}, address = {Bonn}, pages = {12}, language = {de} } @misc{WagnerKuehhornJanetzkeetal., author = {Wagner, Frank and K{\"u}hhorn, Arnold and Janetzke, Timm and Gerstberger, Ulf}, title = {Multi-Objective Optimization of the Cooling Configuration of a High Pressure Turbine Blade}, series = {ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition, Volume 5C: Heat Transfer Oslo, Norway, June 11-15, 2018}, journal = {ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition, Volume 5C: Heat Transfer Oslo, Norway, June 11-15, 2018}, publisher = {ASME}, address = {New York, NY}, isbn = {978-0-7918-5110-4}, doi = {10.1115/GT2018-75616}, pages = {10}, abstract = {Due to the increasing turbine inlet temperature and in order to improve the overall efficiency it is necessary to optimize the cooling design of the hot gas components of an aero engine. The current paper discusses the strategy of optimizing a rotor blade cooling configuration of a small civil aero engine, comprising of films and internal turbulators (ribs). An insight into the parametrization is given including the location of the films and ribs as well as the number of the films and ribs. The parameter reduction results in 18 input parameters for the optimizations to limit the number of parameters to an acceptable level. Two optimizations are carried out with the primary objectives of non-dimensional mass flow and overall cooling effectiveness. Different optimization algorithms are used, namely AMGA and NSGA-II, and compared afterwards. A further optimization is carried out with direct objectives of mass flow and mean surface temperature using the AMGA algorithm. The outputs from the optimizations are presented as a pareto-front. These plots are used for a comparison of the optimization algorithms and formulations respectively. Finally, the differences are discussed and the advantages and disadvantages of the algorithms used are highlighted. Copyright © 2018 by Rolls-Royce Deutschland Ltd \& Co KG}, language = {en} } @techreport{FeindtWoltersBackesetal., author = {Feindt, Peter H. and Wolters, Volkmar and Backes, Gunter and Bahrs, Enno and Brandt, Horst and Engels, Eve-Marie and Engels, Johannes and Graner, Andreas and Hamm, Ulrich and Herdegen, Matthias and Isselstein, Johannes and Schr{\"o}der, Stefan and Tholen, Ernst and Wagner, Sven and W{\"a}tzold, Frank and Wolf, Heino}, title = {Schutz tiergenetischer Ressourcen im Tierseuchenfall - Vorschl{\"a}ge zum Schutz von Tierbest{\"a}nden in Nukleus- bzw. Basiszuchtbetrieben und Besamungsstationen bei Auftreten der Afrikanischen Schweinepest}, publisher = {Bundesanstalt f{\"u}r Landwirtschaft und Ern{\"a}hrung (BLE), Informations- und Koordinationszentrum f{\"u}r Biologische Vielfalt (IBV)}, address = {Bonn}, pages = {9}, language = {de} } @techreport{FeindtWoltersBackesetal., author = {Feindt, Peter H. and Wolters, Volkmar and Backes, Gunter and Bahrs, Enno and Brandt, Horst and Engels, Eve-Marie and Engels, Johannes and Graner, Andreas and Hamm, Ulrich and Herdegen, Matthias and Isselstein, Johannes and Schr{\"o}der, Stefan and Tholen, Ernst and Wagner, Sven and W{\"a}tzold, Frank and Wedekind, Helmut and Wolf, Heino}, title = {Wege zu einem effizienten Waldnaturschutz in Deutschland: Stellungnahme Januar 2020}, address = {Berlin}, pages = {69}, language = {de} } @techreport{MuellerDieterBauhusetal., author = {M{\"u}ller, J{\"o}rg and Dieter, M. and Bauhus, J. and Spellmann, H. and M{\"o}hring, B. and Wagner, S. and Wolf, Heino and Niekisch, M. and Weiger, H. and Feindt, Peter H. and Hamm, Ulrich and W{\"a}tzold, Frank and Wolters, Volkmar and Engels, Eve-Marie and Schraml, U. and Lang, F. and Pr{\"o}bstl-Haider, U. and Richter, K.}, title = {Wege zu einem effizienten Waldnaturschutz in Deutschland. Stellungnahme}, publisher = {Wissenschaftlicher Beirat Waldpolitik und Wissenschaftlicher Beirat Biodiversit{\"a}t und Genetische Ressourcen beim BMEL}, pages = {62}, language = {de} } @misc{WaetzoldFeindtBahrsetal., author = {W{\"a}tzold, Frank and Feindt, Peter H. and Bahrs, Enno and Hamm, Ulrich and Isselstein, Johannes and Schr{\"o}der, Stefan and Wagner, Sven and Wedekind, Helmut and Wolters, Volkmar}, title = {Wie die Politik auf die Bedrohung der Biodiversit{\"a}t in Agrarlandschaften durch den Klimawandel reagieren kann. Stellungnahme des Wissenschaftlichen Beirats f{\"u}r Biodiversit{\"a}t und Genetische Ressourcen beim Bundesministerium f{\"u}r Ern{\"a}hrung und Landwirtschaft}, series = {Berichte {\"u}ber Landwirtschaft : Zeitschrift f{\"u}r Agrarpolitik und Landwirtschaft. Sonderheft}, journal = {Berichte {\"u}ber Landwirtschaft : Zeitschrift f{\"u}r Agrarpolitik und Landwirtschaft. Sonderheft}, number = {232}, issn = {2196-5099}, doi = {10.12767/buel.vi232.330}, pages = {30}, language = {de} }