TY - CHAP A1 - Kühhorn, Arnold A1 - Golze, Mark T1 - An Improved Sandwich Theory for a Better Prediction of the Wrinkling Phenomenon T2 - Proceedings of the Fifth World Congress on Computational Mechanics, Vienna, Austria, July 7 - 12, 2002, held at Vienna University of Technology N2 - An advanced design of sandwichstructures does not only require the knowledge of the global stress- and deformation behavior, but also the knowledge of the local effects, such as load singularities and the loss of stability caused by the short wave wrinkling of one (bending) or both (pressure) sandwich skins.Based on the nonlinear theory for sandwich shells with seven kinematic degrees of freedom, introduced from Kühhorn and Schoop an improved theory for plane sandwich shells with eight degrees of freedom will be presented, enabling a much better representation of the sandwich core behavior.Due to consideration of quadratic core thickness and linear core shear strain as well as longitudinal core deformation an improved prediction of the wrinkling behavior is succeeded even for thick cores and thin skins.The kinematic quantities as well as the nonlinear-differential equations and the simplified equations of first order theory resulting from them are given.Finally applying the well known classical problems of stability loaded by pressure and bending, the efficiency of this 8 DOF-theory ist demonstrated. A comparison with a detailed finite element (plain strain) calculation shows the high quality of these results.The presented sandwich theory characterized by eight degrees of freedom enables the calculation of nearly all essential sandwich phenomena even for thick cores. KW - Sandwich KW - Thickness flexible KW - Wrinkling KW - Stability KW - Platetheory Y1 - 2002 SN - 3-9501554-0-6 CY - Vienna ER - TY - JOUR A1 - Kühhorn, Arnold A1 - Beirow, Bernd T1 - Schwingungsreduzierung an der Antriebseinheit eines Ultraleichtflugzeuges JF - Forum der Forschung N2 - Auf Grund der im Rahmen eines Testfluges subjektiv durch den Piloten festgestellten hohen Schwingungsamplituden wird das dynamische Verhalten eines Ultraleichtflugzeugmotors inklusive der Motoraufhängung untersucht. Hierin wir der numerische Teil der Untersuchun-gen durch eine finite Elemente Simulation abgedeckt, in deren Rahmen die wesentlichen Ei-genschwingformen der Antriebseinheit samt Motorträger identifiziert wurden. Ergänzend mit den Ergebnissen einer experimentellen Modalanalyse und Betriebsschwingungsmessungen konnten wesentliche Informationen gewonnen werden, aus denen als Maßnahme zur Schwin-gungsreduzierung die Erhöhung der Schwungradmasse abgeleitet wurde. KW - Experimentelle Modalanalyse KW - FEM-Simulation KW - Ultraleichtflugzeug Y1 - 2002 SN - 0947-6989 VL - 6 SP - 105 EP - 108 ET - 14 ER - TY - JOUR A1 - Kühhorn, Arnold A1 - Beirow, Bernd A1 - Golze, Mark A1 - Studener, Johannes T1 - Strukturmechanische Analyse einer Triebwerksverdichter-Schaufelscheibe N2 - Die Verbesserung von Kalibriermethoden für Hochdruckverdichterstufen in ausgeführter Integralbauweise verlangt von den Ingenieuren ein detaillierteres Verständnis der strukturdynamischen Zusammenhänge dieses komplexen Bauteils. Als Ausgangsbasis werden zunächst für das perfekte Normdesign bei Ausnutzung der vorliegenden zyklischen Rotationssymmetrie numerische Ergebnisse vorgestellt. Dabei stehen bezüglich des Schwingverhaltens die Kopplungseffekte zwischen Scheibe und Schaufeln im Mittelpunkt, wobei experimentelle Untersu-chungen am realen Bauteil ergänzend hinzugezogen werden. Zukünftig wird in einem weiteren Schritt im Rahmen erheblich aufwendigerer Berechnungen mit der Berücksichtigung von Imperfektionen hinsichtlich der filigranen Schaufeln die Rotationssymmetrie aufgegeben und somit die Basis für eine gezielte Beeinflussung des Schwingverhaltens infolge von Mistuning - Effekten geschaffen. KW - FEM-Simulation KW - Experimentelle Modalanalysen KW - Kopplungseffekte Y1 - 2002 ER - TY - CHAP A1 - Kühhorn, Arnold A1 - Golze, Mark T1 - Thickness flexible theory with generalized core warping for plane sandwich-structures N2 - An advanced design of sandwichstructures does not only require the knowledge of the global stress- and deformation behavior, but also the knowledge of the local effects, such as load singularities and the loss of stability caused by the short wave wrinkling of one (bending) or both (pressure) sandwich skins.Based on the nonlinear theory for sandwich shells with seven kinematic degrees of freedom, introduced from Kühhorn and Schoop an improved theory for plane sandwich shells with eight degrees of freedom (position vector r, director d, and intensity factors az1, az2 for including core flexibility) will be presented, enabling a much better representation of the sandwich core behavior.Due to consideration of quadratic core thickness and linear core shear strain as well as longitudinal core deformation an improved prediction of the wrinkling behavior is succeeded even for thick cores and thin skins.The kinematic quantities as well as the nonlinear-differential equations achieved from the principle of virtual work and the simplified equations of first order theory resulting from them are given.Finally applying the well known classical problems of stability loaded by pressure and bending, the efficiency of this 8 DOF-theory is demonstrated. A comparison with a detailed finite element (plain strain) calculation shows the high quality of these results.The presented sandwich theory characterized by eight kinematic degrees of freedom is valid for arbitrary displacements, rotations and moderat strains enables the calculation of nearly all essential sandwich phenomena even for thick cores. KW - sandwich KW - thickness flexible KW - wrinkling KW - stability Y1 - 2002 ER - TY - CHAP A1 - Golze, Mark A1 - Kühhorn, Arnold T1 - CFK-/GFK-Auslegung am Beispiel eines Modellflügels T2 - Tagungsband, 14. deutschsprachiges ABAQUS Anwendertreffen, 23. - 24. September 2002 in Wiesbaden N2 - Ökonomische und ökologische Bedürfnisse verlangen von modernen Konstruktionen sowohl eine hochintegrative Bauweise als auch eine massive Gewichtseinsparung. Dies führt zu neuen Leichtbaukonstruktionen mit einem stetig zunehmenden Anteil an Faserverbundlösungen. Die hierbei eröffnete Möglichkeit, kraftfluß- und beanspruchungsgerecht auszulegen, erschließt sich erst vollständig durch die sichere Anwendung moderner FE-Programme wie beispielsweise ABAQUS. Nutzt man darüber hinaus die Möglichkeit der flexiblen Script-Programmierung, so lassen sich wirkungsvolle Effizienzsteigerungen durch die gezielte Erstellung spezifischer Eingabemenüs und Ausgaberoutinen erreichen. Dieser Beitrag veranschaulicht an Hand eines ausgeführten und getesteten CFK-Modellflügels unter Biegebeanspruchung, die Vorgehensweise bei Verwendung von ABAQUS und der Script-Sprache Python. KW - CFK KW - GFK KW - FEM KW - ABAQUS KW - Faserverbundauslegungen KW - Python Y1 - 2002 PB - ABACOM Software GmbH CY - Aachen ER - TY - CHAP A1 - Studener, Johannes A1 - Kühhorn, Arnold T1 - FE-Untersuchungen zum dynamischen Verhalten einer integralen Verdichterschaufelscheibe neuer Generation T2 - Tagungsband, 14. deutschsprachiges ABAQUS Anwendertreffen, 23. - 24. September 2002 in Wiesbaden N2 - Eigenwertanalyse eines FE-Modells unter Berücksichtigung des Kopplungsverhaltens zwischen Schaufel und Scheibe KW - BLISK KW - Verdichterstufe Y1 - 2002 PB - Abacom Software GmbH CY - Aachen ER - TY - CHAP A1 - Beirow, Bernd A1 - Kühhorn, Arnold T1 - Schwingungsreduzierung an der Antriebseinheit eines Ultraleichtflugzeuges : Beitrag Deutscher Luft- und Raumfahrtkongress Stuttgart 2002 N2 - Initiiert durch die im Rahmen eines Testfluges subjektiv durch den Piloten festgestellten hohen Schwingungsamplituden wird das dynamische Verhalten eines Ultraleichtflugzeugmotors inklusive der Motoraufhängung untersucht. Hierin wir der numerische Teil der Untersuchungen durch eine finite Elemente Simulation abgedeckt, in deren Rahmen die wesentlichen Eigenschwingformen der Antriebseinheit samt Motorträger identifiziert wurden. Ergänzend mit den Ergebnissen einer experimentellen Modalanalyse und Betriebsschwingungsmessungen konnten wesentliche Informationen gewonnen werden, aus denen als Maßnahme zur Schwin-gungsreduzierung die Erhöhung der Schwungradmasse abgeleitet wurde. KW - Experimentelle Modalanalyse KW - FEM-Simulation KW - Order-track-Analysen Ultraleichflugzeug Y1 - 2002 ER - TY - CHAP A1 - Beirow, Bernd A1 - Kühhorn, Arnold A1 - Osterrieder, Peter T1 - Windinduzierte Schwingungserregung von Fernmeldetürmen T2 - Fluid-Struktur-Wechselwirkung, Tagung Wiesloch, 11. und 12. Juni 2002 N2 - Vorstellung eines stochastischen Verfahrens zur Berechnung windinduzierter Querschwingungen, Präsentation am Beispiel des Fernmeldeturmes Cottbus KW - stochastische Querschwingungsberechnung KW - Lock-in-Effekt Y1 - 2002 SN - 3-18-091682-6 SP - 407 EP - 422 PB - VDI-Verlag CY - Düsseldorf ER - TY - JOUR A1 - Kühhorn, Arnold A1 - Beirow, Bernd A1 - Studener, Johannes T1 - Messtechnische Beanspruchungsuntersuchungen beim Transport von Glasröhrenkollektoren KW - Beanspruchungsuntersuchungen KW - Glasröhrenkollektoren Y1 - 2003 ER - TY - JOUR A1 - Kühhorn, Arnold A1 - Klauke, Thomas A1 - Golze, Mark T1 - Simulation und Verifikation der sukzessiven Bruchabfolge eines CFK-Bauteils mittels neuartiger Bruchkriterien KW - CFK-Bauteile KW - Bruchkriterien KW - Simulation Bruchabfolge Y1 - 2003 ER - TY - CHAP A1 - Studener, Johannes A1 - Kühhorn, Arnold T1 - FE-Simulation des thermischen Aufheizvorganges eines Silizium-Wafers im RTA (Rapid Thermal Anneal) - Prozess T2 - Tagungsband, 15. Deutschsprachige ABAQUS-Benutzerkonferenz, 22. - 23. September 2003, Fulda KW - Silizium-Wafer KW - RTA-Prozess KW - Simulation Y1 - 2003 PB - ABAQUS Deutschland GmbH CY - Aachen [u.a.] ER - TY - CHAP A1 - Klauke, Thomas A1 - Kühhorn, Arnold A1 - Golze, Mark A1 - Villwock, J. A1 - Lenk, Olaf T1 - Finite-Elemente-Anwendung neuerer Faserverbund-Bruchkriterien und deren Verifizierung mittels CFK-Bauteilprüfung T2 - Deutscher Luft- und Raumfahrtkongress 2003, München, 17. bis 20. November 2003, Bd. 1 KW - FEM KW - Faserverbund KW - CFK-Bauteilprüfung Y1 - 2003 SP - 113 EP - 120 PB - Dt. Ges. für Luft- und Raumfahrt CY - Bonn ER - TY - CHAP A1 - Beirow, Bernd A1 - Kühhorn, Arnold A1 - Golze, Mark A1 - Parchem, Roland A1 - Johann, E. T1 - Experimentelle und numerische Untersuchungen hinsichtlich einer Festigkeitsauslegungsoptimierung von Hochdruck-Verdichter-Schaufelscheiben unter besonderer Berücksichtigung von Mistuningeffekten T2 - Deutscher Luft- und Raumfahrtkongress 2003, München, 17. bis 20. November 2003, Bd. 2 KW - Festigkeitsauslegungsoptimierung KW - Hochdruck-Verdichter-Schaufelscheiben KW - Mistuningeffekte Y1 - 2003 SP - 1495 EP - 1504 PB - DGLR CY - Bonn ER - TY - GEN A1 - Kühhorn, Arnold A1 - Beirow, Bernd A1 - Schrape, Sven A1 - Golze, Mark A1 - Knöpke, Martin T1 - Simulation fluidgedämpfter Strukturschwingungen mittels partitionierter Fluid-Struktur-Kopplung T2 - Forum der Forschung Y1 - 2005 SN - 0947-6989 VL - 9 IS - 18 SP - 79 EP - 86 ER - TY - CHAP A1 - Beirow, Bernd A1 - Kühhorn, Arnold A1 - Golze, Mark T1 - Experimental and Numerical Investigations of High pressure Compressor Blades Vibration Behavior Considering Mistuning KW - vibration Y1 - 2005 ER - TY - CHAP A1 - Studener, Johannes A1 - Kühhorn, Arnold T1 - Thermomechanische Simulation des Annealprozesses von großen Siliziumwafern T2 - Tagungsband, 17. Deutschsprachige ABAQUS-Benutzerkonferenz 2005, 19. - 20. September 2005, Nürnberg KW - Annealprozess KW - Siliziumwafer Y1 - 2005 PB - ABAQUS Deutschland GmbH CY - Aachen [u.a.] ER - TY - CHAP A1 - Klauke, Thomas A1 - Beirow, Bernd A1 - Kühhorn, Arnold T1 - Experimental and numerical investigations of blade mistuning and strain gauge application effects in aero engine development Y1 - 2005 ER - TY - JOUR A1 - Schrodt, M. A1 - Benderoth, G. A1 - Kühhorn, Arnold T1 - Hyperelastic description of Polymer Soft Foams at Finite Deformations Y1 - 2005 ER - TY - CHAP A1 - Beirow, Bernd A1 - Kühhorn, Arnold A1 - Golze, Mark A1 - Klauke, Thomas T1 - Experimentelle Untersuchungen des strukturdynamischen Verhaltens von Hochdruckverdichterschaufeln in Integralbauweise (Blisks) mittels Laser-Doppler-Vibrometrie KW - Blisks KW - Integralbauweise Y1 - 2004 ER - TY - JOUR A1 - Kühhorn, Arnold A1 - Beirow, Bernd A1 - Klauke, Thomas A1 - Golze, Mark T1 - Simulation der Mistuningeffekte von Hochdruckverdichter-Schaufelscheiben zur Bestimmung kritischer Schwingungen in Flugtriebwerken KW - Mistuningeffekte KW - Blisks Y1 - 2004 ER - TY - CHAP A1 - Beirow, Bernd A1 - Osterrieder, Peter A1 - Kühhorn, Arnold ED - Dinkler, Dieter T1 - Stochastisches Konzept für die Berechnung von Stahlschornsteinen infolge wirbelerregter Querschwingungen T2 - Berichte der Fachtagung Baustatik - Baupraxis 8, am 21. und 22. März 2002 in Braunschweig Y1 - 2002 SN - 3-926031-95-6 SP - 271 EP - 280 PB - TU, Institut für Statik CY - Braunschweig ER - TY - BOOK A1 - Kühhorn, Arnold A1 - Silber, Gerhard T1 - Technische Mechanik für Ingenieure Y1 - 2000 SN - 3-7785-2620-0 PB - Hüthig-Verlag ER - TY - JOUR A1 - Kühhorn, Arnold A1 - Golze, Mark T1 - Thickness flexible sandwich theory for the common description of global and local effects KW - sandwich structures Y1 - 2004 ER - TY - CHAP A1 - Beirow, Bernd A1 - Kühhorn, Arnold A1 - Golze, Mark A1 - Klauke, Thomas T1 - Strukturdynamische Untersuchungen an Hochdruckverdichterschaufelscheiben unter Berücksichtigung von Mistuningeffekten T2 - Modalanalyse und Identifikation, Verfahren und Anwendungen bei dynamischen Systemen, Tagung Wiesloch, 25. und 26. Mai 2004 KW - Verdichterschaufelscheiben KW - Mistuningeffekte Y1 - 2004 SN - 3-18-091825-X SP - 351 EP - 372 PB - VDI-Verlag CY - Düsseldorf ER - TY - CHAP A1 - Klauke, Thomas A1 - Kühhorn, Arnold A1 - Beirow, Bernd T1 - Numerische Untersuchung des Schwingverhaltens von Hochdruckverdichter-Blisks mit fertigungsbedingten Anweichungen KW - Blisks KW - Schwingverhalten Y1 - 2004 ER - TY - CHAP A1 - Beirow, Bernd A1 - Kühhorn, Arnold A1 - Klauke, Thomas T1 - Lokalisierungsphänomen bei Hochdruckverdichterschaufelscheiben KW - Schaufelscheiben KW - Hochdruckverdichter Y1 - 2006 ER - TY - CHAP A1 - Kühhorn, Arnold A1 - Beirow, Bernd A1 - Parchem, Roland A1 - Klauke, Thomas T1 - Schaufelschwingungen bei realen Verdichter-Integralrädern (BLISK) T2 - Deutscher Luft- und Raumfahrtkongress 2006, Braunschweig, 06. bis 09. November 2006, Bd. 2 KW - Schaufelschwingungen KW - Blisk Y1 - 2006 SP - 1199 EP - 1208 PB - Dt. Ges. für Luft- und Raumfahrt CY - Bonn ER - TY - CHAP A1 - Kühhorn, Arnold T1 - Flug-Triebwerkstechnik - innovative Studienrichtung an der BTU Cottbus unter Beteilugung von RRD, MTU und DLR T2 - Deutscher Luft- und Raumfahrtkongress 2006, Braunschweig, 06. bis 09. November 2006, Bd. 1 KW - Studienrichtung Triebwerkstechnik Y1 - 2006 SP - 593 EP - 596 PB - Dt. Ges. für Luft- und Raumfahrt CY - Bonn ER - TY - JOUR A1 - Kühhorn, Arnold A1 - Beirow, Bernd A1 - Klauke, Thomas T1 - Theoretische und experimentelle Untersuchungen von Schaufelschwingungen bei Verdichterintegralrädern KW - Schaufelschwingungen Y1 - 2006 ER - TY - CHAP A1 - Springmann, Marcel A1 - Scherzer, M. A1 - Kuna, M. A1 - Kühhorn, Arnold T1 - Numerical simulation of localization phenomena in the frame of damage parameter identification T2 - Seminar: Materials modeling, FE simulations of the behavior of modern industrial materials including failure, 5th - 6th December 2006, Niedernhausen (Wiesbaden), Germany Y1 - 2006 SN - 1-874376-19-0 PB - NAFEMS Contact Nordic Countries CY - Grafing b. München ER - TY - CHAP A1 - Schrape, S. A1 - Kühhorn, Arnold A1 - Golze, Mark T1 - Simulation of fluid damped structural vibrations T2 - Proceedings, 7th MpCCI User Forum, February 21st and 22nd 2006, at Schloss Birlinghoven, Sankt Augustin, Germany KW - fluid structures Y1 - 2006 SP - 112 EP - 121 CY - Sankt Augustin ER - TY - JOUR A1 - Schrape, S. A1 - Kühhorn, Arnold T1 - FSI of a Simplified Aero Engine Compressor Cascade Configuration JF - Proceedings in applied mathematics and mechanics : PAMM KW - FSI Y1 - 2006 SN - 1617-7061 VL - 6 IS - 1 SP - 457 EP - 458 ER - TY - CHAP A1 - Schrape, S. A1 - Kühhorn, Arnold A1 - Golze, Mark T1 - Simulation fluidgedämpfter Strukturschwingungen durch partitionierte Fluid-Struktur-Kopplung mittels MpCCI KW - Fluid-Struktur-Kopplung Y1 - 2006 ER - TY - JOUR A1 - Schrape, S. A1 - Kühhorn, Arnold A1 - Golze, Mark T1 - Simulation fluidgedämpfter Strukturschwingungen mittels partitioniertem Kopplungssatz via MpCCI JF - NAFEMS-Magazin KW - fluidgedämpfte Strukturschwingungen Y1 - 2006 VL - 2 IS - 4 SP - 41 EP - 49 ER - 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 - GEN A1 - Springmann, Marcel A1 - Kühhorn, Arnold A1 - Filipiak, A. A1 - Hugler, Daniel A1 - Dufor, K.-H. T1 - Generisches Flugtriebwerksmodell für die Anwendung in der Vorentwicklungsphase Y1 - 2010 ER - TY - GEN A1 - Zolochevsky, Alexander A1 - Galishin, Alexander A1 - Kühhorn, Arnold A1 - Springmann, Marcel T1 - Transversal Shear Effect in Moderately Thick Shells from Materials with Characteristics Dependent on the Kind of Stress State under Creep-Damage Conditions: Numerical Modeling Y1 - 2009 ER - TY - GEN A1 - Zolochevsky, Alexander A1 - Galishin, Alexander A1 - Kühhorn, Arnold A1 - Springmann, Marcel T1 - Transversal Shear Effect in Moderately Thick Shells from Materials with Characteristics Dependent on the Kind of Stress State under Creep-Damage Conditions: Theoretical Framework Y1 - 2009 ER - TY - CHAP A1 - Strehlau, Ulrik A1 - Kühhorn, Arnold A1 - Beirow, Bernd T1 - Numerische und experimentelle Untersuchungen realer Hochdruckverdichterschaufelscheiben in Integralbauweise Y1 - 2009 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 - GEN A1 - Springmann, Marcel A1 - Kühhorn, Arnold A1 - Kuna, M. A1 - Scherzer, M. T1 - Influence of Strain Localization on Parameter Identification Y1 - 2009 ER - TY - CHAP A1 - Springmann, Marcel A1 - Kühhorn, Arnold A1 - Filipiak, A. A1 - Hugler, Daniel A1 - Dufor, K.-H. T1 - Automatic generation and optimization of a simplified aircraft engine model using a graphical user interface and full parameterization Y1 - 2008 ER - TY - CHAP A1 - Strehlau, Ulrik A1 - Kühhorn, Arnold T1 - Schwingungsverhalten von Hochdruckverdichterschaufelscheiben in Integralbauweise (Blisk) unter Berücksichtigung höherer Schwingungsmoden, Erzeugung und Messung von Umlaufwellen, 3D-Geometrievermessung T2 - Deutscher Luft- und Raumfahrtkongress 2008, Darmstadt, 23. bis 25. September 2008, Bd. 1 Y1 - 2008 N1 - Document-ID: 81170 SP - 457 EP - 467 PB - Dt. Ges. für Luft- und Raumfahrt CY - Bonn ER - TY - CHAP A1 - Schrape, S. A1 - Kühhorn, Arnold A1 - Nipkau, Jens A1 - Beirow, Bernd T1 - Application of Aeroelastic Methods in Compressor Cascade Configurations Using Partitioned Code Coupling Y1 - 2008 ER - TY - CHAP A1 - Springmann, Marcel A1 - Kühhorn, Arnold T1 - Coupled thermal-multiphase flow analysis in quenching processes for residual stress optimization in compressor and turbine disks T2 - Proceedings of the ASME Pressure Vessels and Piping Conference - 2008, presented at 2008 ASME Pressure Vessels and Piping Conference, July 27 - 31, 2008, Chicago, Illinois, USA, Vol. 4 Y1 - 2008 SN - 978-0-7918-4827-2 SP - 147 EP - 156 PB - ASME CY - New York, NY ER - TY - CHAP A1 - Springmann, Marcel A1 - Schlums, H. A1 - Kühhorn, Arnold T1 - Numerical simulation of quenching processes for residual stress optimization in compressor and turbine disks Y1 - 2008 ER - TY - CHAP A1 - Beirow, Bernd A1 - Kühhorn, Arnold A1 - Schrape, S. T1 - Development of a new Nickel-base Alloy 718Plus for Compressor and Turbine disks Y1 - 2007 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 - Schrape, S. A1 - Kühhorn, Arnold A1 - Nipkau, Jens T1 - Determination of Aerodynamic Damping of Axial-Compressor-Blades Using A Bidirectional Fluid-Structure-Simulation T2 - 1st CEAS European Air and Space Conference 2007, Deutscher Luft- und Raumfahrtkongress 2007, 10 - 13 September 2007, Berlin, Germany, Bd. 1 Y1 - 2007 N1 - CEAS-2007-027 SP - 309 EP - 318 PB - Dt. Ges. für Luft- und Raumfahrt CY - Bonn ER - TY - CHAP A1 - Klauke, Thomas A1 - Kühhorn, Arnold A1 - Beirow, Bernd T1 - Blade Mistuning Induced Blisk Vibration T2 - 1st CEAS European Air and Space Conference 2007, Deutscher Luft- und Raumfahrtkongress 2007, 10 - 13 September 2007, Berlin, Germany, Bd. 1 Y1 - 2007 SP - 335 EP - 345 PB - Dt. Ges. für Luft- und Raumfahrt CY - Bonn ER - TY - CHAP A1 - Beirow, Bernd A1 - Kühhorn, Arnold A1 - Schrape, S. T1 - Influence of Air Flow on Blisk Vibration Behaviour T2 - 1st CEAS European Air and Space Conference 2007, Deutscher Luft- und Raumfahrtkongress 2007, 10 - 13 September 2007, Berlin, Germany, Bd. 5 Y1 - 2007 N1 - CEAS-2007-058 SP - 3127 EP - 3135 PB - Dt. Ges. für Luft- und Raumfahrt CY - Bonn ER - TY - CHAP A1 - Beirow, Bernd A1 - Kühhorn, Arnold A1 - Schrape, S. T1 - Blisk Vibration Phenomena in Consideration of Fluid Structure Interaction 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 - CHAP A1 - Beirow, Bernd A1 - Kühhorn, Arnold A1 - Schrape, S. T1 - A Discrete model to consider the influence of the air flow on blade vibrations of an intergral blisk compressor rotor 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 - GT2008-50613 SP - 381 EP - 392 PB - ASME CY - New York, NY ER - TY - CHAP A1 - Klauke, Thomas A1 - Kühhorn, Arnold A1 - Beirow, Bernd A1 - Parchem, Roland T1 - Blade Vibration Phenomena of HPC Bliscs Considering Manufacturing Effects and Strain Gauge Application 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 SP - 403 EP - 413 PB - ASME CY - New York, NY ER - TY - JOUR A1 - Nipkau, Jens A1 - Schrape, S. A1 - Beirow, Bernd A1 - Kühhorn, Arnold T1 - Bestimmung aeroelastischer Parameter einer Hochdruckverdichter Stufe mit Hilfe Fluid-Struktur gekoppelter Berechnungen Y1 - 2008 ER - TY - CHAP A1 - Nipkau, Jens A1 - Kühhorn, Arnold A1 - Schrape, S. T1 - Determination of Aeroelastic Parameters of a High-Pressure-Compressor Stage using Fluid-Structure Interaction Calculations T2 - Seminar: Simulation of Complex Flows (CFD), applications and trends, 10th - 11th March 2008, Wiesbaden, Germany Y1 - 2008 SN - 978-1-87437-633-0 PB - NAFEMS Contact DACH & Nordic Countries CY - Bernau am Chiemsee ER - TY - CHAP A1 - Nipkau, Jens A1 - Kühhorn, Arnold A1 - Schrape, S. T1 - Application of Fluid-Structure-Coupling for the Determination of Aeroelastic Parameters of a High-Pressure-Compressor-Blisk-Stage Y1 - 2008 ER - TY - CHAP A1 - Zuchlinski, André A1 - Kühhorn, Arnold T1 - Strukturelle Optimierung der Aufhängung von heckinstallierten und parametrisierten Turbofantriebwerksmodellen Y1 - 2010 ER - TY - CHAP A1 - Strehlau, Ulrik A1 - Kühhorn, Arnold T1 - Research of higher modes E3E/1 stage 1 demonstrator blisk Y1 - 2007 ER - TY - CHAP A1 - Schrape, S. A1 - Kühhorn, Arnold A1 - Nipkau, Jens T1 - Determination of Aerodynamic Damping of Axial-Compressor-Blades using Fluid-Structure-Interaction Methods Y1 - 2007 ER - TY - CHAP A1 - Strehlau, Ulrik A1 - Kühhorn, Arnold T1 - Effects of blade mistuning on frequency veering regions of real HPC blisks Y1 - 2010 ER - TY - CHAP A1 - Strehlau, Ulrik A1 - Kühhorn, Arnold T1 - Experimental and numerical investigations of HPC blisks with a focus on travelling waves T2 - Proceedings of the ASME Turbo Expo 2010, presented at the 2010 ASME Turbo Expo, June 14 - 18, 2010, Glasgow, UK, Volume 6, part B Y1 - 2010 SN - 978-0-7918-4401-4 N1 - GT2010-22463 SP - 865 EP - 878 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 - Strehlau, Ulrik A1 - Kühhorn, Arnold T1 - Experimental and numerical investigations of a HPC-Blisk with focus on travelling waves Y1 - 2009 ER - TY - CHAP A1 - Kühhorn, Arnold A1 - Beirow, Bernd A1 - Strehlau, Ulrik T1 - Zum Schwingungsverhalten integraler Hochdruckverdichterlaufräder 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 - Beirow, Bernd A1 - Kühhorn, Arnold A1 - Nipkau, Jens T1 - On the Influence of Strain Gauge Instrumentation on Blade Vibrations of Integral Blisk Compressor Rotors Applying a Discrete Model T2 - Proceedings of the ASME Turbo Expo 2009, presented at the 2009 ASME Turbo Expo, June 8 - 12, 2009, Orlando, Florida, USA Y1 - 2009 SN - 978-0-7918-4887-6 N1 - GT2009-59207 SP - 245 EP - 254 PB - ASME CY - New York, NY ER - TY - GEN A1 - Klauke, Thomas A1 - Kühhorn, Arnold A1 - Beirow, Bernd A1 - Golze, Mark T1 - Numerical Investigations of Localized Vibrations of Mistuned Blade Integrated Disks (Blisks) 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 - Hönisch, Peter A1 - Kühhorn, Arnold T1 - Experimentelle und numerische Untersuchungen des Schwingungsverhaltensrealer Radialturbinenlaufräder in Integralbauweise (Blisk) im Hinblick auf Verstimmung und Lokalisierung Y1 - 2011 ER - TY - CHAP A1 - Kühhorn, Arnold A1 - Strehlau, Ulrik T1 - Verstimmungsuntersuchungen am Laufrad (Blisk) eines modernenFlugtriebwerk-Hochdruckverdichters Y1 - 2011 ER - TY - CHAP A1 - Hönisch, Peter A1 - Kühhorn, Arnold T1 - Mistuning und Dämpfung von Radialturbinen KW - Mistuning KW - Dämpfung KW - Radialturbine Y1 - 2011 ER - TY - CHAP A1 - Springmann, Marcel A1 - Kühhorn, Arnold A1 - Rauer, Georg A1 - Giersch, Thomas T1 - Constitutive Modelling of Plastic and Creep Behavior of the Nickel Base Superalloy ALLVAC® 718PLUS® under Heat Treatment Conditions KW - Behavior KW - Nickel-Based Superalloy KW - Heat Treatment Conditions Y1 - 2011 ER - TY - CHAP A1 - Beirow, Bernd A1 - Kühhorn, Arnold A1 - Nipkau, Jens T1 - An Equivalent Blisk Model Considering the Influence of the Air Flow on Blade Vibrations of a Mistuned Compressor Blisk T2 - Vibration Problems ICOVP 2011, The 10th International Conference on Vibration Problems, The 10th International Conference on Vibration Problems KW - Mistuned Compressor Blisk KW - Blade Vibrations KW - Air Flow Y1 - 2011 SN - 978-94-007-2068-8 SP - 549 EP - 555 PB - Springer CY - Berlin [u.a.] ER - TY - CHAP A1 - Beirow, Bernd A1 - Nipkau, Jens A1 - Kühhorn, Arnold T1 - Modal and Aeroelastic Analysis of a Compressor Blisk Considering Mistuning T2 - Proceedings of the ASME Turbo Expo 2011, presented at the ASME 2011 Turbo Expo, June 6 - 10, 2011, Vancouver, British Columbia, Canada, Vol. 6, part B KW - Mistuning KW - Compressor Blisk Y1 - 2011 SN - 978-0-7918-5466-2 N1 - GT2011-45849 SP - 1309 EP - 1319 PB - ASME CY - New York, NY ER - TY - CHAP A1 - Höhnisch, Peter A1 - Kühhorn, Arnold A1 - Beirow, Bernd T1 - Experimental and Numerical Analysis of Radial Turbine Bliks with Regard to Mistuning KW - Tadial KW - Turbine KW - Vibration KW - Mistuning KW - Model Update Y1 - 2011 ER - TY - CHAP A1 - Nipkau, Jens A1 - Kühhorn, Arnold A1 - Beirow, Bernd T1 - Modal and Aeroelastic Analysis of a Mistuned Compressor Blisk Using an Equivalent Blisk Model KW - Blisk vibration KW - Mistuning KW - Aerodynamic Influence Coefficients Y1 - 2011 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 - Giersch, Thomas A1 - Beirow, Bernd A1 - Popig, Frederik A1 - Kühhorn, Arnold T1 - FSI-based forced response analyses of a mistuned high pressure compressor blisk T2 - 10th International Conference on Vibrations in Rotating Machinery, 11-13 September 2012, IMechE London, UK KW - Mistuning KW - Blisk KW - Aeroelastics Y1 - 2012 SN - 978-0-85709-452-0 SN - 0-85709-452-1 N1 - Paper C1326/012 PB - Woodhead Publ. CY - Cambridge, UK ER - TY - CHAP A1 - Rauer, Georg A1 - Kühhorn, Arnold A1 - Springmann, Marcel T1 - Residual Stress Simulation of an Aero Engine Disc during Heat Treatment T2 - Proceedings of the 6th European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS 2012), Vienna, Austria, September 10-14, 2012 KW - Residual Stress KW - Disc Heat Treatment Y1 - 2012 SN - 978-3-9502481-9-7 PB - Techn. Univ. CY - Wien ER - TY - CHAP A1 - Beirow, Bernd A1 - Kühhorn, Arnold A1 - Nipkau, Jens T1 - Schwingungsverhalten integraler Hochdruckverdichterlaufräder unter Berücksichtigung von Fluid-Struktur-Wechselwirkung und Mistuning T2 - 61. Deutscher Luft- und Raumfahrtkongress 2012, 10. - 12. September 2012, Estrel Berlin KW - Mistuning KW - Blisk KW - Aeroelastik Y1 - 2012 UR - http://www.dglr.de/publikationen/2012/281219.pdf N1 - Beitrag DLRK2012-281219 PB - Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V. CY - Bonn 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 - GEN A1 - Zolochevsky, Alexander A1 - Parkhomenko, Larisa A1 - Kühhorn, Arnold T1 - Analysis of oxygen exchange-limited transport and chemical stresses in perovskite-type hollow fibers T2 - Materials Chemistry and Physics KW - Perovskite Structure Y1 - 2012 U6 - https://doi.org/10.1016/j.matchemphys.2012.05.031 SN - 0254-0584 VL - 135 IS - 2-3 SP - 594 EP - 603 ER - TY - CHAP A1 - Giersch, Thomas A1 - Hönisch, Peter A1 - Beirow, Bernd A1 - Kühhorn, Arnold T1 - Forced Response Analyses of Mistuned Radial Inflow Turbines T2 - Proceedings of the ASME Turbo Expo 2012 : presented at the 2012 ASME Turbo Expo, June 11 - 15, 2012, Copenhagen, Denmark, Vol. 7, part B KW - Blisk KW - Mistuning KW - Radial Turbine Y1 - 2012 SN - 978-0-7918-4473-1 N1 - Paper GT2012-69556 SP - 1559 EP - 1570 PB - ASME CY - New York, NY ER - TY - CHAP A1 - Rey Villazón, José Maria A1 - Kühhorn, Arnold A1 - Weiß, Thomas T1 - A Parametric Impact Study of the Geometry, Air System and Thermal Boundary Conditions on the Life of a Two-Stage High Pressure Turbine T2 - Proceedings of the ASME Turbo Expo 2012, presented at The ASME 2012 Turbo Expo, June 11-15, 2012, Copenhagen, Denmark, Vol. 7, part A KW - High Pressure Turbine KW - Air System Y1 - 2012 SN - 978-0-7918-4473-1 N1 - Paper GT2012-68453 SP - 373 EP - 382 PB - ASME CY - New York, NY ER - TY - GEN A1 - de Silva, Tina A1 - Kühhorn, Arnold A1 - Golze, Mark T1 - Homogenization of thin structured sheet metals by using FEM T2 - Proceedings in applied mathematics and mechanics : PAMM KW - Structured Sheets KW - FEA Y1 - 2012 UR - http://onlinelibrary.wiley.com/doi/10.1002/pamm.v12.1/issuetoc U6 - https://doi.org/10.1002/pamm.201210104 N1 - GAMM 2012, 83rd Annual Scientific Conference, Darmstadt, 26. - 30. März 2012 VL - 12 IS - 1 SP - 227 EP - 228 ER - TY - GEN A1 - Zolochevsky, Alexander A1 - Martynenko, Alexander A1 - Kühhorn, Arnold T1 - Structural benchmark creep and creep damage testing for finite element analysis with material tension–compression asymmetry and symmetry T2 - Computers and Structures KW - Creep KW - Creep Damage KW - Finite Element Analysis Y1 - 2012 U6 - https://doi.org/10.1016/j.compstruc.2012.02.021 SN - 0045-7949 VL - 100-101 SP - 27 EP - 38 ER - TY - CHAP A1 - Nouri, Behnam A1 - Lehmann, Knut A1 - Kühhorn, Arnold T1 - Investigations on Nusselt Number Enhancement in Ribbed Rectangular Turbine Blade Cooling Channels of Different Aspect Ratios and Rotation Numbers T2 - ASME Turbo Expo 2013: Turbine Technical Conference and Exposition, San Antonio, Texas, USA, June 3–7, 2013, Vol. 3A, Heat Transfer, Paper GT2013-94710 N2 - In the drive for higher cycle efficiencies in gas turbine engines, turbine blades are seeing an increasingly high heat load. This in turn demands improvements in the internal cooling system and a better understanding of both the level and distribution of the internal heat-transfer. A typical approach to enhance the internal cooling of the turbine blade is by casting angled ‘low blockage’ ribs on the walls of the cooling channels. The objective of the present paper is to determine the detailed Nusselt number distribution in rectangular internal channels with ribs. This knowledge can be used to guide the overall design e.g. to achieve high levels of heat-transfer where required. The effects of rotation as well as the interaction effects of the position and direction of ribs on opposite walls of the cooling channel have been investigated. Numerical calculations have been carried out using the commercial CFD code Fluent to investigate the local Nusselt number enhancement factor in rectangular ducts of different aspect ratios (0.5, 1 and 2) which have 45° or 90° angled ribs located on two opposite walls. This has been studied for different Rotation number Ro (0–0.45) and with a Reynolds number >30000. The first series of studies has been carried out with the same experimental setup as by Han [1]. The geometry was slightly changed to avoid the effect of high heat transfer at the entry. This study identifies important vortical structures, which are dependent on the direction and the position of the ribs. This has a profound effect on the distribution of heat-transfer within the passage. It is shown that the two smooth walls of the duct have different average Nusselt number ratio Nu/NuFD enhancement depending on the rib angle. In addition, based on numerical investigations, simple correlations have been developed for the rotational influence of the internal Nusselt number distribution. A major finding is that the effect of rotation is dominant for low aspect ratio channels and the local enhancement due to the rib position and angle is more dominant for high aspect ratio channels. Y1 - 2013 UR - http://proceedings.asmedigitalcollection.asme.org/proceeding.aspx?articleid=1776088 SN - 978-0-7918-5514-0 U6 - https://doi.org/10.1115/GT2013-94710 PB - ASME CY - New York ER - TY - CHAP A1 - Beirow, Bernd A1 - Kühhorn, Arnold A1 - Giersch, Thomas A1 - Nipkau, Jens T1 - Forced Response Analysis of a Mistuned Compressor Blisk T2 - ASME Turbo Expo 2013: Turbine Technical Conference and Exposition, San Antonio, Texas, USA, June 3–7, 2013, Vol. 7B, Structures and Dynamics, Paper GT2013-94142 N2 - The forced response of an E3E-type HPC-blisk front rotor is analyzed with regard to varying mistuning and the consideration of the fluid-structure interaction (FSI). For that purpose, a reduced order model is used in which the disk remains unchanged and mechanical properties of the blades namely stiffness and damping are adjusted to measured as well as intentional blade frequency mistuning distributions. The aerodynamic influence coefficient technique is employed to model the aeroelastics. Depending on the blade mode, the exciting engine order and aerodynamic influences it is sought for the worst mistuning distributions with respect to the maximum blade displacement based on optimization analyses. Genetic algorithms using blade alone frequencies as design variables are applied. The validity of the Whitehead-limit is assessed in this context. In particular, the question is addressed if and how far aeroelastic effects, mainly caused by aerodynamic damping, combined with mistuning can even cause a reduction of the forced response compared to the ideally tuned blisk. It is shown that the strong dependence of the aerodynamic damping on the inter-blade phase angle is the main driver for a possible response attenuation considering the fundamental as well as a higher blade mode. Furthermore, the differences to the blisk vibration response without a consideration of the flow and an increase of the disk’s stiffness are discussed. Closing, the influence of pure damping mistuning is analyzed again using optimization. KW - Compressors KW - Blades KW - Blisks KW - Mistuning Y1 - 2013 UR - http://proceedings.asmedigitalcollection.asme.org/proceeding.aspx?articleid=1776795 SN - 978-0-7918-5527-0 U6 - https://doi.org/10.1115/GT2013-94142 PB - ASME CY - New York ER - TY - GEN A1 - Giersch, Thomas A1 - Hönisch, Peter A1 - Beirow, Bernd A1 - Kühhorn, Arnold T1 - Forced Response Analyses of Mistuned Radial Inflow Turbines T2 - Journal of Turbomachinery N2 - Radial turbine wheels designed as blade integrated disks (blisk) are widely used in various industrial applications. However, related to the introduction of exhaust gas turbochargers in the field of small and medium sized engines, a sustainable demand for radial turbine wheels has come along. Despite those blisks being state of the art, a number of fundamental problems, mainly referring to fluid-structure-interaction and, therefore, to the vibration behavior, have been reported. Aiming to achieve an enhanced understanding of fluid-structure-interaction in radial turbine wheels, a numerical method, able to predict forced responses of mistuned blisks due to aerodynamic excitation, is presented. In a first step, the unsteady aerodynamic forcing is determined by modeling the spiral casing, the stator vanes, and the rotor blades of the entire turbine stage. In a second step, the aerodynamic damping induced by blade vibration is computed using a harmonic balance technique. The structure itself is represented by a reduced order model being extended by aerodynamic damping effects and aerodynamic forcings. Mistuning is introduced by adjusting the modal stiffness matrix based on results of blade by blade measurements that have been performed at rest. In order to verify the numerical method, the results are compared with strain-gauge data obtained during rig-tests. As a result, a measured low engine order excitation was found by modeling the spiral casing. Furthermore, a localization phenomenon due to frequency mistuning could be proven. The predicted amplitudes are close to the measured data. Y1 - 2013 UR - http://turbomachinery.asmedigitalcollection.asme.org/article.aspx?articleid=1672771 U6 - https://doi.org/10.1115/1.4007512 SN - 1528-8900 VL - 135 IS - 3 SP - 031034-1 EP - 031034-9 ER - TY - CHAP A1 - Rey Villazón, José Maria A1 - Berthold, Martin A1 - Kühhorn, Arnold T1 - Adaptive Flow Field Thermal Modeling Techniques for Turbine Rotor-Stator Cavities T2 - Proceedings of ASME Turbo Expo 2013, San Antonio, Texas, USA , June 3-7, 2013, Vol. 3C: Heat Transfer, Paper GT2013-94845 Y1 - 2013 UR - http://proceedings.asmedigitalcollection.asme.org/proceeding.aspx?articleid=1776262 SN - 978-0-7918-5516-4 U6 - https://doi.org/10.1115/GT2013-94845 PB - ASME CY - New York 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 - Klauke, Thomas A1 - Strehlau, Ulrik A1 - Kühhorn, Arnold T1 - Integer Frequency Veering of Mistuned Blade Integrated Disks T2 - Journal of Turbomachinery N2 - As a result of more balanced blade aspect ratios of modern blade-integrated disks (blisks), interactions between disk-dominated and blade-dominated modes are becoming more and more important, especially if blade mistuning is considered. The specific vibration behavior in these transition regions is characterized by a mix of both fundamental mode types into “coupled” modes. In this paper, numerical and experimental investigations based on a front high-pressure compressor (HPC) blisk stage were carried out in order to determine the effect of blade mistuning on those regions in detail. At this, effects like mode localization and amplitude magnification are found to be weakened in an integer frequency-veering zone. Contrary to this, blisks are very sensitive to mistuning in regions of pure blade-dominated mode families with high modal density. KW - Disks KW - Blades Y1 - 2013 U6 - https://doi.org/10.1115/1.4024022 SN - 1528-8900 VL - 135 IS - 6 SP - 061004-1 EP - 061004-7 ER - TY - GEN A1 - Beirow, Bernd A1 - Giersch, Thomas A1 - Kühhorn, Arnold A1 - Nipkau, Jens T1 - Forced Response Analysis of a Mistuned Compressor Blisk T2 - Journal of Engineering for Gas Turbines and Power N2 - The forced response of an E3E-type high pressure compressor (HPC) blisk front rotor is analyzed with regard to varying mistuning and the consideration of the fluid-structure interaction (FSI). For that purpose, a reduced order model is used in which the disk remains unchanged and mechanical properties of the blades, namely stiffness and damping, are adjusted to measured as well as intentional blade frequency mistuning distributions. The aerodynamic influence coefficient technique is employed to model the aeroelastics. Depending on the blade mode, the exciting engine order, and aerodynamic influences, it is sought for the worst mistuning distributions with respect to the maximum blade displacement based on optimization analyses. Genetic algorithms using blade-alone frequencies as design variables are applied. The validity of the Whitehead limit is assessed in this context. In particular, the question is addressed if and how far aeroelastic effects, mainly caused by aerodynamic damping, combined with mistuning can even cause a reduction of the forced response compared to the ideally tuned blisk. It is shown that the strong dependence of the aerodynamic damping on the interblade phase angle is the main driver for a possible response attenuation considering the fundamental as well as a higher blade mode. Furthermore, the differences to the blisk vibration response without a consideration of the flow and an increase of the disk's stiffness are discussed. Closing, the influence of pure damping mistuning is analyzed again using optimization. KW - Blisk Otimization KW - Mistuning Y1 - 2014 U6 - https://doi.org/10.1115/1.4026537 SN - 1528-8919 VL - 136 IS - 6 ER - TY - GEN A1 - Beirow, Bernd A1 - Giersch, Thomas A1 - Kühhorn, Arnold A1 - Nipkau, Jens T1 - Optimization-Aided Forced Response Analysis of a Mistuned Compressor Blisk T2 - Journal of Engineering for Gas Turbines and Power N2 - The forced response of the first rotor of an engine 3E (technology program) (E3E)-type high pressure compressor (HPC) blisk is analyzed with regard to varying mistuning, varying engine order (EO) excitations and the consideration of aero-elastic effects. For that purpose, subset of nominal system modes (SNM)-based reduced order models are used in which the disk remains unchanged while the Young's modulus of each blade is used to define experimentally adjusted as well as intentional mistuning patterns. The aerodynamic influence coefficient (AIC) technique is employed to model aero-elastic interactions. Furthermore, based on optimization analyses and depending on the exciting EO and aerodynamic influences it is searched for the worst as well as the best mistuning distributions with respect to the maximum blade displacement. Genetic algorithms using blade stiffness variations as vector of design variables and the maximum blade displacement as objective function are applied. An allowed limit of the blades' Young's modulus standard deviation is formulated as secondary condition. In particular, the question is addressed if and how far the aero-elastic impact, mainly causing aerodynamic damping, combined with mistuning can even yield a reduction of the forced response compared to the ideally tuned blisk. It is shown that the strong dependence of the aerodynamic damping on the interblade phase angle is the main driver for a possible response attenuation considering the fundamental blade mode. The results of the optimization analyses are compared to the forced response due to real, experimentally determined frequency mistuning as well as intentional mistuning. KW - Mistuning KW - Forced Response KW - Compressor Blisk Y1 - 2015 U6 - https://doi.org/10.1115/1.4028095 SN - 1528-8919 VL - 137 IS - 1 SP - 012504-1 EP - 012504-10 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 -