TY - CHAP A1 - Klauke, Thomas A1 - Kühhorn, Arnold A1 - Liang, Luo A1 - Kober, Markus T1 - Entwicklung eines 3-Blatt-CFK-Verstellpropellers für Ultraleichtflugzeuge N2 - Internationale AVK-Tagung, 13.-14. September 2010, Essen Y1 - 2010 ER - TY - CHAP A1 - Klauke, Thomas A1 - Kühhorn, Arnold A1 - Liang, Luo A1 - Kober, Markus A1 - Sieghart, D. A1 - Führer, M. A1 - Viehweger, Bernd A1 - Fritzsche, Christoph A1 - Sarradj, Ennes T1 - Entwicklung eines 3-Blatt-CFK-Verstellpropellers für Ultraleichtflugzeuge N2 - Deutscher Luft- und Raumfahrkongress 2010, 31.08. - 02.09.2010, Hamburg Y1 - 2010 ER - TY - CHAP A1 - Kober, Markus A1 - Kühhorn, Arnold T1 - Auslegung und Optimierungsprozess einer Tragstruktur in Faserverbundbauweise unter Berücksichtigung moderner Versagenskriterien Y1 - 2009 ER - TY - CHAP A1 - Kober, Markus A1 - Kühhorn, Arnold A1 - Klauke, Thomas T1 - Auslegung einer Flanschverbindung aus faserverstärktem Kunststoff durch Optimierung der Faserorientierungen und Schichtdicken mit Hilfe von Altair HyperStudy unter Verwendung eines Wirkebenenbruchkriteriums als Nebenbedingung Y1 - 2007 ER - TY - CHAP A1 - Kober, Markus A1 - Klauke, Thomas A1 - Kühhorn, Arnold A1 - Lenk, Olaf T1 - Einbindung eines modernen Wirkebenenbruchkriteriums für faserverstärkte Kunststoffe in eine Parameteroptimierung mit Altair HyperStudy Y1 - 2006 ER - TY - CHAP A1 - Kober, Markus A1 - Kühhorn, Arnold A1 - Klauke, Thomas A1 - Lenk, Olaf T1 - Topology-Optimized Intermediate Casing of Aero Engine and Comparative Evaluation of Titanium and Composite Architecture in Terms of Load Capacity and Weight Reduction T2 - Proceedings of the ASME Turbo Expo 2008, presented at the 2008 ASME Turbo Expo, June 9 - 13, 2008, Berlin, Germany, Vol. 5, part A Y1 - 2008 SN - 978-0-7918-4315-4 N1 - GT2008-50644 SP - 69 EP - 79 PB - ASME CY - New York, NY ER - TY - GEN A1 - Kober, Markus A1 - Kühhorn, Arnold T1 - Development of optimized washer-shape for damage-free load application to composites T2 - Composite Structures Y1 - 2010 SN - 0263-8223 VL - 92 IS - 9 SP - 1985 EP - 1991 ER - TY - CHAP A1 - Kober, Markus T1 - HyperWorks im Einsatz in der Lehre Y1 - 2009 ER - TY - CHAP A1 - Kober, Markus A1 - Kühhorn, Arnold T1 - Development of optimized washer shape for damage-free load application to composites Y1 - 2009 ER - TY - CHAP A1 - Klauke, Thomas A1 - Kühhorn, Arnold A1 - Kober, Markus T1 - Application of a Newer Inter-Fiber-Failure Criteria on CFRPs in Aero Engine Development Y1 - 2010 ER - TY - CHAP A1 - Stelldinger, Enrico A1 - Kühhorn, Arnold A1 - Kober, Markus T1 - Otimization of a Carbon-fiber-reinforced Plastic Composite Structure using the Example of a Wing Rigger KW - Optimization KW - Composite KW - Wing Rigger Y1 - 2011 ER - TY - GEN A1 - Kober, Markus A1 - Kühhorn, Arnold T1 - Comparison of different failure criteria for fiber-reinforced plastics in terms of fracture curves for arbitrary stress combinations T2 - Composites Science and Technology KW - Failure Criteria KW - Fibre Reinforced Plastic Y1 - 2012 U6 - https://doi.org/10.1016/j.compscitech.2012.08.007 SN - 0266-3538 VL - 72 IS - 15 SP - 1941 EP - 1951 ER - TY - CHAP A1 - Zuchlinski, André A1 - Kühhorn, Arnold A1 - Kober, Markus A1 - Wehrenpfennig, Lutz T1 - Kombinierte Topologie- und Parameteroptimierung des Aufhängungssystems von heckinstallierten Turbofantriebwerken T2 - 61. Deutscher Luft- und Raumfahrtkongress 2012, 10. - 12. September 2012, Estrel Berlin KW - Hecktriebwerksaufhängung KW - Optimierung Y1 - 2012 N1 - Beitrag DLRK 2012-281168 PB - Dt. Ges. für Luft- und Raumfahrt CY - Bonn ER - TY - THES A1 - Kober, Markus T1 - Ein Beitrag zur strukturmechanischen Optimierung realer Bauteile in metallischer und Faserverbundbauweise unter Verwendung von wirkebenenbasierten Bruchkriterien KW - Optimierung KW - Verbundbauweise KW - Bruchkriterien Y1 - 2011 SN - 978-3-86387-085-0 PB - Mensch und Buch CY - Berlin ER - TY - GEN A1 - Mahler-de Silva, Tina A1 - Kühhorn, Arnold A1 - Kober, Markus T1 - Developing a Simplified Surrogate Model for Structured Sheet Metals with Numerical and Experimental Comparisons T2 - Proceedings in applied mathematics and mechanics : PAMM N2 - It is important to steadily refine lightweight designs with regard to saving resources and energy in common with good economic efficiency. Thin structured sheet metals offer significantly improved component stiffnesses in addition to an upgraded buckling behavior compared to flat, unstructured sheet metals. By using a distortion energy based homogenization method it is possible to develop a mechanical surrogate model which describes effective mean properties. The accurate selection of symmetric and periodic boundaries enables to determine the required parameters. The conditions are contemplated on elementary cells whose structural mechanical behavior is representative for the elastic behavior of large structures. By doing this, the amount of elements can be reduced and thus the calculating time of large components can considerably be saved. For an efficient surrogate model it is required to analyze and compare numerical with experimental investigations. Some different versions of optimization will be tested to get better approximation of the data. KW - Structured Sheet Metals Y1 - 2013 UR - http://onlinelibrary.wiley.com/doi/10.1002/pamm.201310045/abstract N1 - GAMM 2013, 84th Annual Scientific Conference, Novi Sad , 18. - 22. März 2013 VL - 13 IS - 1 SP - 99 EP - 100 ER - TY - GEN A1 - Zolochevsky, Alexander A1 - Sklepus, Sergiy A1 - Galishin, Alexander A1 - Kühhorn, Arnold A1 - Kober, Markus T1 - A Comparison between the 3D and the Kirchhoff-Love Solutions for Cylinders under Creep-Damage Conditions T2 - Technische Mechanik KW - creep deformation Y1 - 2014 UR - http://www.ovgu.de/ifme/zeitschrift_tm/2014_Heft2/04_Zolochevsky_et_al.pdf VL - 34 IS - 2 SP - 104 EP - 113 ER - TY - CHAP A1 - Kober, Markus A1 - Kühhorn, Arnold A1 - Stelldinger, Enrico A1 - Keskin, Akin T1 - Considerations About the Necessary Mesh Density of Bearings in Detailed Finite Element Models T2 - ASME Turbo Expo 2014: Turbine Technical Conference and Exposition, Volume 7B: Structures and Dynamics Düsseldorf, Germany, June 16–20, 2014, Paper GT2014-25624 N2 - In order to predict properly the behavior of very complex mechanical models, much focus needs to be done on the level of model details as well as the techniques used to predict component movements based on mechanical and thermal loads. In particular bearings and joints play a significant role in big model assemblies such as aero-engines where most of the structures are modeled by solid elements rather than using traditional shell or beam elements. This approach is very complex and expensive in terms of computational effort however can lead to increased simulation accuracy when done properly. This publication will answer questions related to the modeling techniques required for detailed bearings (not only rotor bearings) and joints of an aero-engine application where these components are not idealized or simplified, i.e. the ball in a ball joint is meshed by solid elements. The investigation will discuss the question about the number of elements needed to mesh a ball joint in such a way that a correct rotation is possible. If the mesh is too coarse, a rotation would be impossible due to the faceting of the rotating parts. It will be shown that a proper rotation depends on a correct relation between the radius of the inner ball, the gap size of the bearing and the number of nodes in the circumferential direction. For this relation an analytical formula has been derived and successfully tested at some examples. Furthermore, some finite element codes offer the possibility of smoothed contact surfaces. These options improve the situation but they might cause issues too. For this reason these smoothed contact options are also considered under the aspects mentioned above. Copyright © 2014 by Rolls-Royce Deutschland Ltd & Co KG KW - Density KW - Bearings Y1 - 2014 SN - 978-0-7918-4577-6 U6 - https://doi.org/10.1115/GT2014-25624 PB - ASME ER - TY - CHAP A1 - Kober, Markus A1 - Kühhorn, Arnold A1 - Kästner, Benjamin A1 - Keskin, Akin T1 - Evaluation of the Stress and Displacement Behavior of Different LS-Dyna Element Types in Combination with Different Anti-Hourglassing Formulations and Initial Element Deformations T2 - Kurzfassungen der Vorträge, 13. LS-DYNA Forum 2014, 6. - 8. Oktober 2014, Bamberg Y1 - 2014 SN - 978-3-9816215-1-8 PB - DYNAmore GmbH CY - Stuttgart ER - TY - CHAP A1 - Kober, Markus A1 - Kühhorn, Arnold A1 - Stelldinger, Enrico A1 - Keskin, Akin T1 - Identification of Stiffness Parameters of a Simplified Aero-Engine Mount System by Using a Higher Fidelity Model of the Mount System T2 - Kurzfassungen der Vorträge, 13. LS-DYNA Forum 2014, 6. - 8. Oktober 2014, Bamberg Y1 - 2014 SN - 978-3-9816215-1-8 PB - DYNAmore GmbH CY - Stuttgart ER - TY - GEN A1 - Kober, Markus A1 - Kühhorn, Arnold A1 - Rademann, Jörg A1 - Mück, Bernhard T1 - Nonlinear topology optimization of centrifugally loaded aero-engine part with newly developed optimality-criteria based algorithm T2 - Aerospace Science and Technology N2 - In this paper a successful topology optimization of a centrifugally loaded aero-engine part is presented. For the topology optimization, which is a nonlinear problem due to several contact regions, a self-developed topology optimization algorithm in combination with a commercial FE-solver is used. The goal of the optimization was the reduction of stresses in the structure. ©2014 Rolls-Royce Deutschland Ltd & Co. KG. Published by Elsevier Masson SAS. All rights reserved. KW - Topology optimization KW - Optimality criteria KW - Aero-engine KW - Centrifugal loading Y1 - 2014 UR - http://www.sciencedirect.com/science/article/pii/S1270963814001783 U6 - https://doi.org/10.1016/j.ast.2014.09.005 VL - Vol. 39 SP - 705 EP - 711 ER -