TY  - JOUR
A1  - Koch, Christopher
A1  - Böhnisch, Nils
A1  - Verdonck, Hendrik
A1  - Hach, Oliver
A1  - Braun, Carsten
T1  - Comparison of unsteady low- and mid-fidelity propeller aerodynamic methods for whirl flutter applications
JF  - Applied Sciences
N2  - Aircraft configurations with propellers have been drawing more attention in recent times, partly due to new propulsion concepts based on hydrogen fuel cells and electric motors. These configurations are prone to whirl flutter, which is an aeroelastic instability affecting airframes with elastically supported propellers. It commonly needs to be mitigated already during the design phase of such configurations, requiring, among other things, unsteady aerodynamic transfer functions for the propeller. However, no comprehensive assessment of unsteady propeller aerodynamics for aeroelastic analysis is available in the literature. This paper provides a detailed comparison of nine different low- to mid-fidelity aerodynamic methods, demonstrating their impact on linear, unsteady aerodynamics, as well as whirl flutter stability prediction. Quasi-steady and unsteady methods for blade lift with or without coupling to blade element momentum theory are evaluated and compared to mid-fidelity potential flow solvers (UPM and DUST) and classical, derivative-based methods. Time-domain identification of frequency-domain transfer functions for the unsteady propeller hub loads is used to compare the different methods. Predictions of the minimum required pylon stiffness for stability show good agreement among the mid-fidelity methods. The differences in the stability predictions for the low-fidelity methods are higher. Most methods studied yield a more unstable system than classical, derivative-based whirl flutter analysis, indicating that the use of more sophisticated aerodynamic modeling techniques might be required for accurate whirl flutter prediction.
KW  - Aeroelasticity
KW  - Flutter
KW  - Propeller whirl flutter
KW  - Unsteady aerodynamics
KW  - 1P hub loads
Y1  - 2024
U6  - http://dx.doi.org/10.3390/app14020850
SN  - 2076-3417
VL  - 14
IS  - 2
SP  - 1
EP  - 28
PB  - MDPI
CY  - Basel
ER  - 
TY  - JOUR
A1  - Ley, Wilfried
A1  - Plescher, Engelbert
A1  - Scholz, Artur
A1  - Piepenbrock, Johannes
T1  - COMPASS-1 picosatellite project / Ley, Wilfried ; Plescher, Engelbert ; Scholz, Artur ; Piepenbrock, Johannes
JF  - Small satellites for earth observation : digest of the 6th International symposium of the International Academy of Astronautics, Berlin, April 23 - 26, 2007 / ed. by Rainer Sandau; Hans-Peter Röser; Arnoldo Valenzuela
Y1  - 2007
SN  - 9783896855718
N1  - Symposium on Small Satellites for Earth Observation ; (6, 2007, Berlin)
SP  - 147
EP  - 150
PB  - Wissenschaft und Technik Verl.
CY  - Berlin
ER  - 
TY  - JOUR
A1  - Prume, Klaus
A1  - Roelofs, Andreas
A1  - Schmitz, Thorsten
A1  - Reichenberg, Bernd
T1  - Compensation of the Parasitic Capacitance of a Scanning Force Microscope Cantilever Used for Measurements on Ferroelectric Capacitors of Submicron Size by Means of Finite Element Simulations / Prume, Klaus ; Roelofs, Andreas ; Schmitz, Thorsten ; Reichenb
JF  - Japanese Journal of Applied Physics. 41 (2002), H. 11B
Y1  - 2002
SN  - 0021-4922
SP  - 7198
EP  - 7201
ER  - 
TY  - BOOK
A1  - Faßbender, Heinz
A1  - Gladtz, Katia
A1  - Vogler, Heiko
T1  - Compiler based implementation of syntax directed functional programming
Y1  - 1991
N1  - (Aachener Informatik-Berichte ; 91,10)
PB  - RWTH, Fachgruppe Informatik
CY  - Aachen
ER  - 
TY  - CHAP
A1  - Ferrein, Alexander
A1  - Meeßen, Marcus
A1  - Limpert, Nicolas
A1  - Schiffer, Stefan
ED  - Lepuschitz, Wilfried
T1  - Compiling ROS Schooling Curricula via Contentual Taxonomies
T2  - Robotics in Education
Y1  - 2021
SN  - 978-3-030-67411-3
U6  - http://dx.doi.org/10.1007/978-3-030-67411-3_5
N1  - RiE: International Conference on Robotics in Education (RiE);
Advances in Intelligent Systems and Computing book series (AISC, volume 1316)
SP  - 49
EP  - 60
PB  - Springer
CY  - Cham
ER  - 
TY  - JOUR
A1  - Hoyler, Friedrich
A1  - Shi, Z. R.
A1  - Schreckenback, K.
A1  - Aprahamian, A.
T1  - Complete spectroscopy and the 162Dy nucleus / Z. R. Shi ; K. Schreckenbach ; A. Aprahamian ... F. Hoyler ...
JF  - AIP conference proceedings (1999)
Y1  - 1999
SN  - 0094-243X
N1  - American Institute of Physics conference proceedings
SP  - 237
EP  - 238
ER  - 
TY  - JOUR
A1  - Hoyler, Friedrich
A1  - Aprahamian, A.
A1  - Wu, X.
A1  - Lesher, S. R.
T1  - Complete spectroscopy of the 162Dy nucleus / Aprahamian, A. ; Wu, X. ; Lesher, S. R. ; Warner, D. D. ; Gelletly, W. ; Börner, H. G. ; Hoyler, F. ; Schreckenbach, K. ; Carsten R. F. ; Shi, Z. R. ; Kusnezov, D. ; Ibrahim, M. ; Macchiavelli, A. O. ; Brinkman
JF  - Nuclear physics <Amsterdam> / A. 764 (2006)
Y1  - 2006
SN  - 0375-9474
SP  - 42
EP  - 78
ER  - 
TY  - CHAP
A1  - Hüning, Felix
T1  - Complexity for heterogeneous classes: teaching embedded systems using an open project approach
T2  - Varietas delectat: Complexity is the new normality - 47th Annual Conference, Budapest, Hungary16th - 20th September 2019. SEFI 47th Annual Conference Proceedings
Y1  - 2019
SN  - 978-2-87352-018-2
SP  - 540
EP  - 549
ER  - 
TY  - JOUR
A1  - Starke, Günther
A1  - Kuhne, A.H.
A1  - Frassek, B.
T1  - Components for the automated GMAW process. Bestandteile des automatischen Metall-Schutzgas-Schweissverfahrens
JF  - Welding Journal. 63 (1984), H. 1
Y1  - 1984
SN  - 0043-2296
SP  - 31
EP  - 34
ER  - 
TY  - CHAP
A1  - Dilthey, Ulrich
A1  - Schleser, Markus
ED  - Barroso de Aguiar, Jose
ED  - Jalali, Said
ED  - Camoes, Aires
ED  - Ferrera, Rui Miguel
T1  - Composite improvement of textile reinforced concrete by polymeric impregnation of the textiles
T2  - International Symposium Polymers in Concrete : proceedings of ISPIC 2006, 2-4 April 2006 - University of Minho - Guimarães, Portugal
Y1  - 2006
SN  - 972-99179-1-4
SP  - 185
EP  - 192
PB  - Universidade do Minho, Departamento de Engenharia Civil
CY  - Guimarães
ER  -