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Parametric Study of the Flutter Stability of a Swept-Back Half-Wing with Engine Nacelle in Subsonic Flow.

Försching, H. and Keßler, C. (1994) Parametric Study of the Flutter Stability of a Swept-Back Half-Wing with Engine Nacelle in Subsonic Flow. ZFW Zeitschrift fuer Flugwissenschaften und Weltraumforschung., pp. 289-302. Springer Verlag.

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A parametric investiagation of the aeroelastic flutter stability behaviour of a swept-back half-wing with a pylon-mounted engine nacelle in inviscid subsonic flow is performed. The equations of motion, and therefrom the aeroelastic stability equations, are derived in terms of generalized coordinates in modal form, applying the Rayleigh-Ritz method with assumed mode functions. Two specific mode shapes - a fundamental wing bending mode together with each of three different engine nacelle pitching modes - are combined individually to compose a binary flutter system with two degrees of freedom. For the computation of the motion-induced unsteady (generalized) airloads, a panel technique is used for both the wing and the engine nacelle that is replaced by an annular wing. For a configuration representative of modern large transport aircraft, numerical results are presented for a variety of systematic parameter variations and Mach numbers. Thereby, for each binary combination of mode shapes, special emphasis is placed on the effects of the frequency ratio of the respective modes and the location of the wing torsional node lines of the various engine pitching modes, together with the effects of the motion-induced unsteady airloads on the engine nacelle.

Item URL in elib:https://elib.dlr.de/39679/
Document Type:Article
Additional Information: institution=DLR, DGLR, LIDO-Berichtsjahr=1994, pages=14,
Title:Parametric Study of the Flutter Stability of a Swept-Back Half-Wing with Engine Nacelle in Subsonic Flow.
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Journal or Publication Title:ZFW Zeitschrift fuer Flugwissenschaften und Weltraumforschung.
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 289-302
Publisher:Springer Verlag
Series Name:18/5
Keywords:Structural vibrations, aeroelastic stability, unsteady aerodynamics.
HGF - Research field:UNSPECIFIED
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:UNSPECIFIED
DLR - Program:L ST - Starrflüglertechnologien
DLR - Research theme (Project):UNSPECIFIED
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity
Deposited By: DLR-Beauftragter, elib
Deposited On:02 Apr 2006
Last Modified:27 Apr 2009 10:51

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