@article{KuehhornBeirow, author = {K{\"u}hhorn, Arnold and Beirow, Bernd}, title = {Schwingungsreduzierung an der Antriebseinheit eines Ultraleichtflugzeuges}, series = {Forum der Forschung}, volume = {6}, journal = {Forum der Forschung}, edition = {14}, issn = {0947-6989}, pages = {105 -- 108}, abstract = {Auf Grund der im Rahmen eines Testfluges subjektiv durch den Piloten festgestellten hohen Schwingungsamplituden wird das dynamische Verhalten eines Ultraleichtflugzeugmotors inklusive der Motoraufh{\"a}ngung 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 Motortr{\"a}ger identifiziert wurden. Erg{\"a}nzend mit den Ergebnissen einer experimentellen Modalanalyse und Betriebsschwingungsmessungen konnten wesentliche Informationen gewonnen werden, aus denen als Maßnahme zur Schwin-gungsreduzierung die Erh{\"o}hung der Schwungradmasse abgeleitet wurde.}, language = {de} } @article{KuehhornBeirowGolzeetal., author = {K{\"u}hhorn, Arnold and Beirow, Bernd and Golze, Mark and Studener, Johannes}, title = {Strukturmechanische Analyse einer Triebwerksverdichter-Schaufelscheibe}, abstract = {Die Verbesserung von Kalibriermethoden f{\"u}r Hochdruckverdichterstufen in ausgef{\"u}hrter Integralbauweise verlangt von den Ingenieuren ein detaillierteres Verst{\"a}ndnis der strukturdynamischen Zusammenh{\"a}nge dieses komplexen Bauteils. Als Ausgangsbasis werden zun{\"a}chst f{\"u}r das perfekte Normdesign bei Ausnutzung der vorliegenden zyklischen Rotationssymmetrie numerische Ergebnisse vorgestellt. Dabei stehen bez{\"u}glich des Schwingverhaltens die Kopplungseffekte zwischen Scheibe und Schaufeln im Mittelpunkt, wobei experimentelle Untersu-chungen am realen Bauteil erg{\"a}nzend hinzugezogen werden. Zuk{\"u}nftig wird in einem weiteren Schritt im Rahmen erheblich aufwendigerer Berechnungen mit der Ber{\"u}cksichtigung von Imperfektionen hinsichtlich der filigranen Schaufeln die Rotationssymmetrie aufgegeben und somit die Basis f{\"u}r eine gezielte Beeinflussung des Schwingverhaltens infolge von Mistuning - Effekten geschaffen.}, language = {de} } @inproceedings{ChmielewskiGorskiBeirowetal., author = {Chmielewski, Tadeusz and Gorski, Piotr and Beirow, Bernd and Kretzschmar, Joachim}, title = {Comparison of Theoretical and Experimental Free Vibrations of High Industrial Chimney Interacting with Soil}, series = {Teoria konstrukcji, konstrukcje metalowe, konstrukcje betonowe, XLVIII Konferencja Naukowa Komitetu Inżynierii Lądowej i Wodnej PAN i Komitetu Nauki PZITB Krynica 2002, Opole-Krynica 15-20 września 2002 r.}, booktitle = {Teoria konstrukcji, konstrukcje metalowe, konstrukcje betonowe, XLVIII Konferencja Naukowa Komitetu Inżynierii Lądowej i Wodnej PAN i Komitetu Nauki PZITB Krynica 2002, Opole-Krynica 15-20 września 2002 r.}, publisher = {Dolnośląskie Wydaw. Edukacyjne}, address = {Wrocław}, isbn = {83-7125-091-6}, pages = {27 -- 34}, abstract = {Theoretical frequencies and mode shapes of the high multi-flue industrial chimney, which is located in the power station of Opole, interacting with soil have been evaluated through the application of the finite element method. The aim of the present paper is to study the free vibrations of this chimney applying dynamic testing in full scale to confirm a calculation model and to obtain important information on the effect of soil interacting with the chimney.}, language = {en} } @inproceedings{BeirowKuehhorn, author = {Beirow, Bernd and K{\"u}hhorn, Arnold}, title = {Schwingungsreduzierung an der Antriebseinheit eines Ultraleichtflugzeuges : Beitrag Deutscher Luft- und Raumfahrtkongress Stuttgart 2002}, abstract = {Initiiert durch die im Rahmen eines Testfluges subjektiv durch den Piloten festgestellten hohen Schwingungsamplituden wird das dynamische Verhalten eines Ultraleichtflugzeugmotors inklusive der Motoraufh{\"a}ngung untersucht. Hierin wir der numerische Teil der Untersuchungen durch eine finite Elemente Simulation abgedeckt, in deren Rahmen die wesentlichen Eigenschwingformen der Antriebseinheit samt Motortr{\"a}ger identifiziert wurden. Erg{\"a}nzend mit den Ergebnissen einer experimentellen Modalanalyse und Betriebsschwingungsmessungen konnten wesentliche Informationen gewonnen werden, aus denen als Maßnahme zur Schwin-gungsreduzierung die Erh{\"o}hung der Schwungradmasse abgeleitet wurde.}, language = {de} } @inproceedings{BeirowKuehhornOsterrieder, author = {Beirow, Bernd and K{\"u}hhorn, Arnold and Osterrieder, Peter}, title = {Windinduzierte Schwingungserregung von Fernmeldet{\"u}rmen}, series = {Fluid-Struktur-Wechselwirkung, Tagung Wiesloch, 11. und 12. Juni 2002}, booktitle = {Fluid-Struktur-Wechselwirkung, Tagung Wiesloch, 11. und 12. Juni 2002}, publisher = {VDI-Verlag}, address = {D{\"u}sseldorf}, isbn = {3-18-091682-6}, pages = {407 -- 422}, abstract = {Vorstellung eines stochastischen Verfahrens zur Berechnung windinduzierter Querschwingungen, Pr{\"a}sentation am Beispiel des Fernmeldeturmes Cottbus}, language = {de} } @article{GroschBeirow, author = {Grosch, A. and Beirow, Bernd}, title = {Ausgew{\"a}hlte bauphysikalische Probleme von Wohngeb{\"a}uden in Stahl-Leichtbauweise}, language = {de} } @inproceedings{BeirowOsterrieder, author = {Beirow, Bernd and Osterrieder, Peter}, title = {Dynamic Investigations of TV Towers}, series = {Structural engineering, mechanics, and computation, proceedings of the International Conference on Structural Engineering, Mechanics, and Computation, 2-4 April 2001, Cape Town, South Africa, Bd. 1}, booktitle = {Structural engineering, mechanics, and computation, proceedings of the International Conference on Structural Engineering, Mechanics, and Computation, 2-4 April 2001, Cape Town, South Africa, Bd. 1}, editor = {Zingoni, Alphose}, publisher = {Elsevier}, address = {Amsterdam}, isbn = {0-08-043948-9}, pages = {629 -- 636}, language = {en} } @article{KuehhornBeirowStudener, author = {K{\"u}hhorn, Arnold and Beirow, Bernd and Studener, Johannes}, title = {Messtechnische Beanspruchungsuntersuchungen beim Transport von Glasr{\"o}hrenkollektoren}, language = {de} } @inproceedings{BeirowKuehhornGolzeetal., author = {Beirow, Bernd and K{\"u}hhorn, Arnold and Golze, Mark and Parchem, Roland and Johann, E.}, title = {Experimentelle und numerische Untersuchungen hinsichtlich einer Festigkeitsauslegungsoptimierung von Hochdruck-Verdichter-Schaufelscheiben unter besonderer Ber{\"u}cksichtigung von Mistuningeffekten}, series = {Deutscher Luft- und Raumfahrtkongress 2003, M{\"u}nchen, 17. bis 20. November 2003, Bd. 2}, booktitle = {Deutscher Luft- und Raumfahrtkongress 2003, M{\"u}nchen, 17. bis 20. November 2003, Bd. 2}, publisher = {DGLR}, address = {Bonn}, pages = {1495 -- 1504}, language = {de} } @misc{KuehhornBeirowSchrapeetal., author = {K{\"u}hhorn, Arnold and Beirow, Bernd and Schrape, Sven and Golze, Mark and Kn{\"o}pke, Martin}, title = {Simulation fluidged{\"a}mpfter Strukturschwingungen mittels partitionierter Fluid-Struktur-Kopplung}, series = {Forum der Forschung}, volume = {9}, journal = {Forum der Forschung}, number = {18}, issn = {0947-6989}, pages = {79 -- 86}, language = {de} } @inproceedings{BeirowKuehhornGolze, author = {Beirow, Bernd and K{\"u}hhorn, Arnold and Golze, Mark}, title = {Experimental and Numerical Investigations of High pressure Compressor Blades Vibration Behavior Considering Mistuning}, language = {en} } @inproceedings{KlaukeBeirowKuehhorn, author = {Klauke, Thomas and Beirow, Bernd and K{\"u}hhorn, Arnold}, title = {Experimental and numerical investigations of blade mistuning and strain gauge application effects in aero engine development}, language = {en} } @misc{ChmielewskiGorskiBeirowetal., author = {Chmielewski, Tadeusz and Gorski, Piotr and Beirow, Bernd and Kretzschmar, Joachim}, title = {Theoretical and experimental free vibrations of tall industrial chimney with flexibility of soil}, series = {Engineering structures}, volume = {27}, journal = {Engineering structures}, number = {1}, issn = {0141-0296}, pages = {25 -- 34}, language = {en} } @inproceedings{BeirowKuehhornGolzeetal., author = {Beirow, Bernd and K{\"u}hhorn, Arnold and Golze, Mark and Klauke, Thomas}, title = {Experimentelle Untersuchungen des strukturdynamischen Verhaltens von Hochdruckverdichterschaufeln in Integralbauweise (Blisks) mittels Laser-Doppler-Vibrometrie}, language = {de} } @article{KuehhornBeirowKlaukeetal., author = {K{\"u}hhorn, Arnold and Beirow, Bernd and Klauke, Thomas and Golze, Mark}, title = {Simulation der Mistuningeffekte von Hochdruckverdichter-Schaufelscheiben zur Bestimmung kritischer Schwingungen in Flugtriebwerken}, language = {de} } @inproceedings{BeirowOsterriederKuehhorn, author = {Beirow, Bernd and Osterrieder, Peter and K{\"u}hhorn, Arnold}, title = {Stochastisches Konzept f{\"u}r die Berechnung von Stahlschornsteinen infolge wirbelerregter Querschwingungen}, series = {Berichte der Fachtagung Baustatik - Baupraxis 8, am 21. und 22. M{\"a}rz 2002 in Braunschweig}, booktitle = {Berichte der Fachtagung Baustatik - Baupraxis 8, am 21. und 22. M{\"a}rz 2002 in Braunschweig}, editor = {Dinkler, Dieter}, publisher = {TU, Institut f{\"u}r Statik}, address = {Braunschweig}, isbn = {3-926031-95-6}, pages = {271 -- 280}, language = {de} } @phdthesis{Beirow, author = {Beirow, Bernd}, title = {Experimentelle und theoretische Untersuchungen des dynamischen Verhaltens von Fernmeldet{\"u}rmen}, publisher = {BTU, Lehrstuhl Statik und Dynamik}, address = {Cottbus}, pages = {XVII, 163}, language = {de} } @inproceedings{KretzschmarBeirow, author = {Kretzschmar, Joachim and Beirow, Bernd}, title = {Dynamic Diagnostic of Timber Structures Supported by Neural Networks}, language = {de} } @inproceedings{BeirowKuehhornGolzeetal., author = {Beirow, Bernd and K{\"u}hhorn, Arnold and Golze, Mark and Klauke, Thomas}, title = {Strukturdynamische Untersuchungen an Hochdruckverdichterschaufelscheiben unter Ber{\"u}cksichtigung von Mistuningeffekten}, series = {Modalanalyse und Identifikation, Verfahren und Anwendungen bei dynamischen Systemen, Tagung Wiesloch, 25. und 26. Mai 2004}, booktitle = {Modalanalyse und Identifikation, Verfahren und Anwendungen bei dynamischen Systemen, Tagung Wiesloch, 25. und 26. Mai 2004}, publisher = {VDI-Verlag}, address = {D{\"u}sseldorf}, isbn = {3-18-091825-X}, pages = {351 -- 372}, language = {de} } @inproceedings{KlaukeKuehhornBeirow, author = {Klauke, Thomas and K{\"u}hhorn, Arnold and Beirow, Bernd}, title = {Numerische Untersuchung des Schwingverhaltens von Hochdruckverdichter-Blisks mit fertigungsbedingten Anweichungen}, language = {de} } @article{OsterriederBeirow, author = {Osterrieder, Peter and Beirow, Bernd}, title = {Advanced dynamic methods for structural evaluation of TV towers, Proseedings of the Centre of Structural Integrity}, language = {en} } @inproceedings{BeirowKuehhornKlauke, author = {Beirow, Bernd and K{\"u}hhorn, Arnold and Klauke, Thomas}, title = {Lokalisierungsph{\"a}nomen bei Hochdruckverdichterschaufelscheiben}, language = {de} } @inproceedings{KuehhornBeirowParchemetal., author = {K{\"u}hhorn, Arnold and Beirow, Bernd and Parchem, Roland and Klauke, Thomas}, title = {Schaufelschwingungen bei realen Verdichter-Integralr{\"a}dern (BLISK)}, series = {Deutscher Luft- und Raumfahrtkongress 2006, Braunschweig, 06. bis 09. November 2006, Bd. 2}, booktitle = {Deutscher Luft- und Raumfahrtkongress 2006, Braunschweig, 06. bis 09. November 2006, Bd. 2}, publisher = {Dt. Ges. f{\"u}r Luft- und Raumfahrt}, address = {Bonn}, pages = {1199 -- 1208}, language = {de} } @article{KuehhornBeirowKlauke, author = {K{\"u}hhorn, Arnold and Beirow, Bernd and Klauke, Thomas}, title = {Theoretische und experimentelle Untersuchungen von Schaufelschwingungen bei Verdichterintegralr{\"a}dern}, language = {de} } @article{Beirow, author = {Beirow, Bernd}, title = {Secure Power for Jet Engines}, language = {en} } @phdthesis{Beirow, author = {Beirow, Bernd}, title = {Grundlegende Untersuchungen zum Schwingungsverhalten von Verdichterlaufr{\"a}dern in Integralbauweise}, publisher = {Shaker}, address = {Aachen}, isbn = {978-3-8322-8729-0}, pages = {XII, 160}, language = {de} } @inproceedings{StrehlauKuehhornBeirow, author = {Strehlau, Ulrik and K{\"u}hhorn, Arnold and Beirow, Bernd}, title = {Numerische und experimentelle Untersuchungen realer Hochdruckverdichterschaufelscheiben in Integralbauweise}, language = {de} } @inproceedings{SchrapeKuehhornNipkauetal., author = {Schrape, S. and K{\"u}hhorn, Arnold and Nipkau, Jens and Beirow, Bernd}, title = {Application of Aeroelastic Methods in Compressor Cascade Configurations Using Partitioned Code Coupling}, language = {en} } @inproceedings{BeirowKuehhornSchrape, author = {Beirow, Bernd and K{\"u}hhorn, Arnold and Schrape, S.}, title = {Development of a new Nickel-base Alloy 718Plus for Compressor and Turbine disks}, language = {en} } @inproceedings{KlaukeKuehhornBeirow, author = {Klauke, Thomas and K{\"u}hhorn, Arnold and Beirow, Bernd}, title = {Blade Mistuning Induced Blisk Vibration}, series = {1st CEAS European Air and Space Conference 2007, Deutscher Luft- und Raumfahrtkongress 2007, 10 - 13 September 2007, Berlin, Germany, Bd. 1}, booktitle = {1st CEAS European Air and Space Conference 2007, Deutscher Luft- und Raumfahrtkongress 2007, 10 - 13 September 2007, Berlin, Germany, Bd. 1}, publisher = {Dt. Ges. f{\"u}r Luft- und Raumfahrt}, address = {Bonn}, pages = {335 -- 345}, language = {en} } @inproceedings{BeirowKuehhornSchrape, author = {Beirow, Bernd and K{\"u}hhorn, Arnold and Schrape, S.}, title = {Influence of Air Flow on Blisk Vibration Behaviour}, series = {1st CEAS European Air and Space Conference 2007, Deutscher Luft- und Raumfahrtkongress 2007, 10 - 13 September 2007, Berlin, Germany, Bd. 5}, booktitle = {1st CEAS European Air and Space Conference 2007, Deutscher Luft- und Raumfahrtkongress 2007, 10 - 13 September 2007, Berlin, Germany, Bd. 5}, publisher = {Dt. Ges. f{\"u}r Luft- und Raumfahrt}, address = {Bonn}, pages = {3127 -- 3135}, language = {en} } @inproceedings{BeirowKuehhornSchrape, author = {Beirow, Bernd and K{\"u}hhorn, Arnold and Schrape, S.}, title = {Blisk Vibration Phenomena in Consideration of Fluid Structure Interaction}, language = {en} } @inproceedings{BeirowKuehhornSchrape, author = {Beirow, Bernd and K{\"u}hhorn, Arnold and Schrape, S.}, title = {A Discrete model to consider the influence of the air flow on blade vibrations of an intergral blisk compressor rotor}, series = {Proceedings of the ASME Turbo Expo 2008, presented at the 2008 ASME Turbo Expo, June 9 - 13, 2008, Berlin, Germany, Vol. 5, part A}, booktitle = {Proceedings of the ASME Turbo Expo 2008, presented at the 2008 ASME Turbo Expo, June 9 - 13, 2008, Berlin, Germany, Vol. 5, part A}, publisher = {ASME}, address = {New York, NY}, isbn = {978-0-7918-4315-4}, pages = {381 -- 392}, language = {en} } @inproceedings{KlaukeKuehhornBeirowetal., author = {Klauke, Thomas and K{\"u}hhorn, Arnold and Beirow, Bernd and Parchem, Roland}, title = {Blade Vibration Phenomena of HPC Bliscs Considering Manufacturing Effects and Strain Gauge Application}, series = {Proceedings of the ASME Turbo Expo 2008, presented at the 2008 ASME Turbo Expo, June 9 - 13, 2008, Berlin, Germany, Vol. 5, part A}, booktitle = {Proceedings of the ASME Turbo Expo 2008, presented at the 2008 ASME Turbo Expo, June 9 - 13, 2008, Berlin, Germany, Vol. 5, part A}, publisher = {ASME}, address = {New York, NY}, isbn = {978-0-7918-4315-4}, pages = {403 -- 413}, language = {en} } @article{NipkauSchrapeBeirowetal., author = {Nipkau, Jens and Schrape, S. and Beirow, Bernd and K{\"u}hhorn, Arnold}, title = {Bestimmung aeroelastischer Parameter einer Hochdruckverdichter Stufe mit Hilfe Fluid-Struktur gekoppelter Berechnungen}, language = {de} } @inproceedings{KuehhornBeirowStrehlau, author = {K{\"u}hhorn, Arnold and Beirow, Bernd and Strehlau, Ulrik}, title = {Zum Schwingungsverhalten integraler Hochdruckverdichterlaufr{\"a}der}, language = {de} } @inproceedings{BeirowKuehhornNipkau, author = {Beirow, Bernd and K{\"u}hhorn, Arnold and Nipkau, Jens}, title = {On the Influence of Strain Gauge Instrumentation on Blade Vibrations of Integral Blisk Compressor Rotors Applying a Discrete Model}, series = {Proceedings of the ASME Turbo Expo 2009, presented at the 2009 ASME Turbo Expo, June 8 - 12, 2009, Orlando, Florida, USA}, booktitle = {Proceedings of the ASME Turbo Expo 2009, presented at the 2009 ASME Turbo Expo, June 8 - 12, 2009, Orlando, Florida, USA}, publisher = {ASME}, address = {New York, NY}, isbn = {978-0-7918-4887-6}, pages = {245 -- 254}, language = {en} } @misc{KlaukeKuehhornBeirowetal., author = {Klauke, Thomas and K{\"u}hhorn, Arnold and Beirow, Bernd and Golze, Mark}, title = {Numerical Investigations of Localized Vibrations of Mistuned Blade Integrated Disks (Blisks)}, language = {de} } @inproceedings{BeirowKuehhornNipkau, author = {Beirow, Bernd and K{\"u}hhorn, Arnold and Nipkau, Jens}, title = {An Equivalent Blisk Model Considering the Influence of the Air Flow on Blade Vibrations of a Mistuned Compressor Blisk}, series = {Vibration Problems ICOVP 2011, The 10th International Conference on Vibration Problems, The 10th International Conference on Vibration Problems}, booktitle = {Vibration Problems ICOVP 2011, The 10th International Conference on Vibration Problems, The 10th International Conference on Vibration Problems}, publisher = {Springer}, address = {Berlin [u.a.]}, isbn = {978-94-007-2068-8}, pages = {549 -- 555}, language = {en} } @inproceedings{BeirowNipkauKuehhorn, author = {Beirow, Bernd and Nipkau, Jens and K{\"u}hhorn, Arnold}, title = {Modal and Aeroelastic Analysis of a Compressor Blisk Considering Mistuning}, series = {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}, booktitle = {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}, publisher = {ASME}, address = {New York, NY}, isbn = {978-0-7918-5466-2}, pages = {1309 -- 1319}, language = {en} } @inproceedings{HoehnischKuehhornBeirow, author = {H{\"o}hnisch, Peter and K{\"u}hhorn, Arnold and Beirow, Bernd}, title = {Experimental and Numerical Analysis of Radial Turbine Bliks with Regard to Mistuning}, language = {en} } @inproceedings{NipkauKuehhornBeirow, author = {Nipkau, Jens and K{\"u}hhorn, Arnold and Beirow, Bernd}, title = {Modal and Aeroelastic Analysis of a Mistuned Compressor Blisk Using an Equivalent Blisk Model}, language = {en} } @inproceedings{GierschBeirowPopigetal., author = {Giersch, Thomas and Beirow, Bernd and Popig, Frederik and K{\"u}hhorn, Arnold}, title = {FSI-based forced response analyses of a mistuned high pressure compressor blisk}, series = {10th International Conference on Vibrations in Rotating Machinery, 11-13 September 2012, IMechE London, UK}, booktitle = {10th International Conference on Vibrations in Rotating Machinery, 11-13 September 2012, IMechE London, UK}, publisher = {Woodhead Publ.}, address = {Cambridge, UK}, isbn = {978-0-85709-452-0}, language = {en} } @inproceedings{BeirowKuehhornNipkau, author = {Beirow, Bernd and K{\"u}hhorn, Arnold and Nipkau, Jens}, title = {Schwingungsverhalten integraler Hochdruckverdichterlaufr{\"a}der unter Ber{\"u}cksichtigung von Fluid-Struktur-Wechselwirkung und Mistuning}, series = {61. Deutscher Luft- und Raumfahrtkongress 2012, 10. - 12. September 2012, Estrel Berlin}, booktitle = {61. Deutscher Luft- und Raumfahrtkongress 2012, 10. - 12. September 2012, Estrel Berlin}, publisher = {Deutsche Gesellschaft f{\"u}r Luft- und Raumfahrt - Lilienthal-Oberth e.V.}, address = {Bonn}, pages = {9}, language = {de} } @inproceedings{GierschHoenischBeirowetal., author = {Giersch, Thomas and H{\"o}nisch, Peter and Beirow, Bernd and K{\"u}hhorn, Arnold}, title = {Forced Response Analyses of Mistuned Radial Inflow Turbines}, series = {Proceedings of the ASME Turbo Expo 2012 : presented at the 2012 ASME Turbo Expo, June 11 - 15, 2012, Copenhagen, Denmark, Vol. 7, part B}, booktitle = {Proceedings of the ASME Turbo Expo 2012 : presented at the 2012 ASME Turbo Expo, June 11 - 15, 2012, Copenhagen, Denmark, Vol. 7, part B}, publisher = {ASME}, address = {New York, NY}, isbn = {978-0-7918-4473-1}, pages = {1559 -- 1570}, language = {en} } @inproceedings{BeirowKuehhornGierschetal., author = {Beirow, Bernd and K{\"u}hhorn, Arnold and Giersch, Thomas and Nipkau, Jens}, title = {Forced Response Analysis of a Mistuned Compressor Blisk}, series = {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}, booktitle = {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}, publisher = {ASME}, address = {New York}, isbn = {978-0-7918-5527-0}, doi = {10.1115/GT2013-94142}, pages = {10}, abstract = {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.}, language = {en} } @misc{GierschHoenischBeirowetal., author = {Giersch, Thomas and H{\"o}nisch, Peter and Beirow, Bernd and K{\"u}hhorn, Arnold}, title = {Forced Response Analyses of Mistuned Radial Inflow Turbines}, series = {Journal of Turbomachinery}, volume = {135}, journal = {Journal of Turbomachinery}, number = {3}, issn = {1528-8900}, doi = {10.1115/1.4007512}, pages = {031034-1 -- 031034-9}, abstract = {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.}, language = {en} } @misc{BeirowGierschKuehhornetal., author = {Beirow, Bernd and Giersch, Thomas and K{\"u}hhorn, Arnold and Nipkau, Jens}, title = {Forced Response Analysis of a Mistuned Compressor Blisk}, series = {Journal of Engineering for Gas Turbines and Power}, volume = {136}, journal = {Journal of Engineering for Gas Turbines and Power}, number = {6}, issn = {1528-8919}, doi = {10.1115/1.4026537}, pages = {13}, abstract = {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.}, language = {en} } @misc{BeirowGierschKuehhornetal., author = {Beirow, Bernd and Giersch, Thomas and K{\"u}hhorn, Arnold and Nipkau, Jens}, title = {Optimization-Aided Forced Response Analysis of a Mistuned Compressor Blisk}, series = {Journal of Engineering for Gas Turbines and Power}, volume = {137}, journal = {Journal of Engineering for Gas Turbines and Power}, number = {1}, issn = {1528-8919}, doi = {10.1115/1.4028095}, pages = {012504-1 -- 012504-10}, abstract = {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.}, language = {en} } @inproceedings{BeirowMaywaldKuehhorn, author = {Beirow, Bernd and Maywald, Thomas and K{\"u}hhorn, Arnold}, title = {Mistuning and Damping Analysis of a Radial Turbine Blisk in Varying Ambient Conditions}, series = {ASME Turbo Expo 2014: Turbine Technical Conference and Exposition, Volume 7B: Structures and Dynamics D{\"u}sseldorf, Germany, June 16-20, 2014, Paper GT2014-25521}, booktitle = {ASME Turbo Expo 2014: Turbine Technical Conference and Exposition, Volume 7B: Structures and Dynamics D{\"u}sseldorf, Germany, June 16-20, 2014, Paper GT2014-25521}, publisher = {ASME}, isbn = {978-0-7918-4577-6}, doi = {10.1115/GT2014-25521}, abstract = {A mistuned radial turbine impeller is analyzed with respect to the impact of varying ambient pressures and temperatures as well on frequency response functions and modal damping ratios. Beginning at room conditions, a finite element model of an impeller wheel at rest is updated based on experimentally determined mistuning in terms of blade dominated frequencies. The following numerical forced response analyses yield a maximum blade displacement amplification of 67\% compared to the tuned reference. In addition, modal damping ratios are determined in dependence on the ambient pressure ranging from technical vacuum at 1 mbar up to 6000 mbar in a pressure chamber. Shaker excitation and laser Doppler vibrometry response measurement is employed in this context. A linear dependence of modal damping ratios on ambient pressure and a dominating damping contribution of the surrounding air even for higher modes could be proved. Moreover, the experimental determination of frequency response functions (FRF) at technical vacuum yields a better separation of resonance peaks compared to room conditions at 1013 mbar and hence, this data allows for more accurate model-updates in principle. It is proved that numerical models updated regarding mistuning at room conditions are well suited to predict the forced response at arbitrary pressures if measured modal damping ratios at these pressures are considered. Finally, within analyzing the effect of increasing structural temperatures with the surrounding air at 1013 mbar included slightly decreasing resonance frequencies but strongly increasing FRF-amplitudes are determined. Copyright © 2014 by ASME}, language = {en} }