TY - CHAP A1 - Ellinger, Frank A1 - Meister, Tilo A1 - Grosa, Patrick A1 - Jamshidi, Kambiz A1 - Ihle, David A1 - Franchi, Norman A1 - Wagner, Jens A1 - Richter, Andreas A1 - Fettweis, Gerhard A1 - Fitzek, Frank A1 - Kreissig, Martin A1 - Klessig, Henrik A1 - Kraemer, Rolf A1 - Richter, Klaus A1 - Frotzscher, Andreas A1 - Löhr, Robert A1 - Winkler, Wolfgang A1 - Zoeke, Dominik A1 - Carot, Alexander A1 - Bluschke, Andreas T1 - Project FAST - Fast Actuators Sensors & Transceivers T2 - Microwave Conference (LAMC), IEEE MTT-S Latin America, 12-14 Dec. 2016 Puerto Vallarta, Mexico Y1 - 2016 SN - 978-1-5090-4287-6 PB - IEEE CY - Piscataway, NJ ER - TY - CHAP A1 - Eickhoff, Ralf A1 - Tittelbach-Helmrich, Klaus A1 - Wickert, Michael A1 - Wagner, Jens A1 - Mayer, Uwe A1 - Elvira, Victor A1 - Ibáñez, Jesús A1 - Stamenković, Zoran A1 - Ellinger, Frank T1 - Physical Layer Amendments for MIMO Features in 802.11a Y1 - 2011 ER - TY - RPRT A1 - Feindt, Peter H. A1 - Wolters, Volkmar A1 - Backes, Gunter A1 - Bahrs, Enno A1 - Dempfle, Leo A1 - Engels, Eve-Marie A1 - Engels, Johannes A1 - Graner, Andreas A1 - Hamm, Ulrich A1 - Herdegen, Matthias A1 - Isselstein, Johannes A1 - Konnert, Monika A1 - Schröder, Stefan A1 - Schulte-Coerne, Hermann A1 - Wagner, Sven A1 - Wätzold, Frank A1 - Wedekind, Helmut T1 - Gründung der Deutschen Genbank landwirtschaftlicher Nutztiere : Kurzstellungnahme des Wissenschaftlichen Beirats für Biodiversität und Genetische Ressourcen beim Bundesministerium für Ernährung und Landwirtschaft Y1 - 2015 UR - https://beirat-gr.genres.de//fileadmin/SITE_GENRES/downloads/docs/Beirat-GR/Gutachten_Stellungnahmen/beirat_09_2015.pdf PB - BMEL CY - Bonn ER - TY - RPRT A1 - Wätzold, Frank A1 - Bahrs, Enno A1 - Feindt, Peter H. A1 - Hamm, Ulrich A1 - Isselstein, Johannes A1 - Schröder, Stefan A1 - Wolters, Volkmar A1 - Backes, Gunter A1 - Dempfle, Leo A1 - Engels, Eve-Marie A1 - Engels, Johannes A1 - Graner, Andreas A1 - Herdegen, Matthias A1 - Konnert, Monika A1 - Schulte-Coerne, Hermann A1 - Wagner, Sven A1 - Wedekind, Helmut T1 - Perspektiven für das artenreiche Grünland - Alternativen zur Belohnung einer Überschussproduktion bei Milch Y1 - 2015 CY - Bonn ER - TY - CHAP A1 - Wagner, Frank A1 - Kühhorn, Arnold T1 - Response surface based robust design optimization on the example of a high pressure turbine blade T2 - 8. Dresdner Probabilistik-Workshop, Technische Universität Dresden, 08.-09. Okt. 2015 N2 - 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. Y1 - 2015 UR - http://www.probabilistik.de/abstract/abstract_15_wagner.html UR - http://www.probabilistik.de/prog_15.html CY - Dresden ER - TY - CHAP A1 - Wagner, Frank A1 - Kühhorn, Arnold A1 - Parchem, Roland T1 - Robust design optimization applied to a high pressure turbine blade based on surrogate modelling techniques T2 - ASME Turbo Expo 2015: Turbine Technical Conference and Exposition Volume 7A: Structures and Dynamics Montreal, Quebec, Canada, June 15–19, 2015 N2 - 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 KW - Turbine blades KW - High pressure (Physics) KW - Design KW - Modeling KW - Optimization Y1 - 2015 SN - 978-0-7918-5676-5 U6 - https://doi.org/10.1115/GT2015-42365 ER - TY - GEN A1 - Wagner, Frank A1 - Kühhorn, Arnold A1 - Weiss, Thomas A1 - Otto, Dierk T1 - Influence of different parametrizations on the optimum design of a high pressure turbine blade firtree T2 - ASME Turbo Expo 2016, Turbomachinery Technical Conference and Exposition, Volume 7A, Structures and Dynamics, Seoul, South Korea, June 13–17, 2016 N2 - 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. Y1 - 2016 SN - 978-0-7918-4983-5 U6 - https://doi.org/10.1115/GT2016-56749 PB - ASME CY - New York, NY ER - TY - RPRT A1 - Feindt, Peter H. A1 - Wolters, Volkmar A1 - Backes, Gunter A1 - Bahrs, Enno A1 - Brandt, Horst A1 - Dempfle, Leo A1 - Engels, Eve-Marie A1 - Engels, Johannes A1 - Graner, Andreas A1 - Hamm, Ulrich A1 - Herdegen, Matthias A1 - Isselstein, Johannes A1 - Konnert, Monika A1 - Schröder, Stefan A1 - Wagner, Sven A1 - Wätzold, Frank A1 - Wedekind, Helmut T1 - Verbraucher für die Erhaltung der biologischen Vielfalt in der Landwirtschaft aktivieren! Y1 - 2016 UR - http://www.schafzuchtverband-berlin-brandenburg.de/wp-content/uploads/Stellungnahme_Beirat.pdf PB - Bundesanstalt für Landwirtschaft und Ernährung (BLE) Informations- und Koordinationszentrum für Biologische Vielfalt (IBV) CY - Bonn ER - TY - GEN A1 - Wagner, Frank A1 - Kühhorn, Arnold A1 - Janetzke, Timm A1 - Gerstberger, Ulf T1 - Multi-Objective Optimization of the Cooling Configuration of a High Pressure Turbine Blade T2 - ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition, Volume 5C: Heat Transfer Oslo, Norway, June 11–15, 2018 N2 - 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 KW - Cooling KW - Turbine Blades KW - High Pressure (Physics) KW - Pareto Optimization Y1 - 2018 SN - 978-0-7918-5110-4 U6 - https://doi.org/10.1115/GT2018-75616 PB - ASME CY - New York, NY ER - TY - RPRT A1 - Feindt, Peter H. A1 - Wolters, Volkmar A1 - Backes, Gunter A1 - Bahrs, Enno A1 - Brandt, Horst A1 - Engels, Eve-Marie A1 - Engels, Johannes A1 - Graner, Andreas A1 - Hamm, Ulrich A1 - Herdegen, Matthias A1 - Isselstein, Johannes A1 - Schröder, Stefan A1 - Tholen, Ernst A1 - Wagner, Sven A1 - Wätzold, Frank A1 - Wolf, Heino T1 - Schutz tiergenetischer Ressourcen im Tierseuchenfall - Vorschläge zum Schutz von Tierbeständen in Nukleus- bzw. Basiszuchtbetrieben und Besamungsstationen bei Auftreten der Afrikanischen Schweinepest Y1 - 2018 UR - https://www.genres.de/fileadmin/SITE_MASTER/content/SITE_GENRES/downloads/docs/Beirat-GR/Gutachten_Stellungnahmen/StellungnahmeWBBGR_Tierseuche_AfrikansicheSchweinepest_09_2018_web.pdf PB - Bundesanstalt für Landwirtschaft und Ernährung (BLE), Informations- und Koordinationszentrum für Biologische Vielfalt (IBV) CY - Bonn ER - TY - RPRT A1 - Feindt, Peter H. A1 - Wolters, Volkmar A1 - Backes, Gunter A1 - Bahrs, Enno A1 - Brandt, Horst A1 - Engels, Eve-Marie A1 - Engels, Johannes A1 - Graner, Andreas A1 - Hamm, Ulrich A1 - Herdegen, Matthias A1 - Isselstein, Johannes A1 - Schröder, Stefan A1 - Tholen, Ernst A1 - Wagner, Sven A1 - Wätzold, Frank A1 - Wedekind, Helmut A1 - Wolf, Heino T1 - Wege zu einem effizienten Waldnaturschutz in Deutschland: Stellungnahme Januar 2020 Y1 - 2020 UR - https://www.fnr.de/fileadmin/allgemein/pdf/Effizienter_Waldnaturschutz_in_Deutschland.pdf CY - Berlin ER - TY - RPRT A1 - Müller, Jörg A1 - Dieter, M. A1 - Bauhus, J. A1 - Spellmann, H. A1 - Möhring, B. A1 - Wagner, S. A1 - Wolf, Heino A1 - Niekisch, M. A1 - Weiger, H. A1 - Feindt, Peter H. A1 - Hamm, Ulrich A1 - Wätzold, Frank A1 - Wolters, Volkmar A1 - Engels, Eve-Marie A1 - Schraml, U. A1 - Lang, F. A1 - Pröbstl-Haider, U. A1 - Richter, K. T1 - Wege zu einem effizienten Waldnaturschutz in Deutschland. Stellungnahme Y1 - 2020 UR - http://www.fnr.de/fileadmin/allgemein/pdf/Effizienter_Waldnaturschutz_in_Deutschland.pdf PB - Wissenschaftlicher Beirat Waldpolitik und Wissenschaftlicher Beirat Biodiversität und Genetische Ressourcen beim BMEL ER - TY - GEN A1 - Wätzold, Frank A1 - Feindt, Peter H. A1 - Bahrs, Enno A1 - Hamm, Ulrich A1 - Isselstein, Johannes A1 - Schröder, Stefan A1 - Wagner, Sven A1 - Wedekind, Helmut A1 - Wolters, Volkmar T1 - Wie die Politik auf die Bedrohung der Biodiversität in Agrarlandschaften durch den Klimawandel reagieren kann. Stellungnahme des Wissenschaftlichen Beirats für Biodiversität und Genetische Ressourcen beim Bundesministerium für Ernährung und Landwirtschaft T2 - Berichte über Landwirtschaft : Zeitschrift für Agrarpolitik und Landwirtschaft. Sonderheft Y1 - 2020 U6 - https://doi.org/10.12767/buel.vi232.330 SN - 2196-5099 IS - 232 ER -