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T-tail flutter simulations with regard to quadratic mode shape components

Schäfer, Dominik (2021) T-tail flutter simulations with regard to quadratic mode shape components. CEAS Aeronautical Journal, 12 (3), Seiten 621-632. Springer. doi: 10.1007/s13272-021-00524-8. ISSN 1869-5590.

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Kurzfassung

It is known that the dynamic aeroelastic stability of T-tails is dependent on the steady aerodynamic forces at aircraft trim condition. Accounting for this dependency in the flutter solution process involves correction methods for doublet lattice method (DLM) unsteady aerodynamics, enhanced DLM algorithms, unsteady vortex lattice methods (UVLM), or the use of CFD. However, the aerodynamic improvements along with a commonly applied modal approach with linear displacements results in spurious stiffness terms, which distort the flutter velocity prediction. Hence, a higher order structural approach with quadratic mode shape components is required for accurate flutter velocity prediction of T-tails. For the study of the effects of quadratic mode shape components on T-tail flutter, a generic tail configuration without sweep and taper is used. Euler based CFD simulations are applied involving a linearized frequency domain (LFD) approach to determine the generalized aerodynamic forces. These forces are obtained based on steady CFD computations at varying horizontal tail plane (HTP) incidence angles. The quadratic mode shape components of the fundamental structural modes for the vertical tail plane (VTP), i.e., out-of-plane bending and torsion, are received from nonlinear as well as linear finite element analyses. Modal coupling resulting solely from the extended modal representation of the structure and its influence on T-tail flutter is studied. The g-method is applied to solve for the flutter velocities and corresponding flutter mode shapes. The impact of the quadratic mode shape components is visualized in terms of flutter velocities in dependency of the HTP incidence angle and the static aerodynamic HTP loading.

elib-URL des Eintrags:https://elib.dlr.de/146797/
Dokumentart:Zeitschriftenbeitrag
Titel:T-tail flutter simulations with regard to quadratic mode shape components
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Schäfer, DominikD.Schaefer (at) dlr.dehttps://orcid.org/0000-0002-2042-7525NICHT SPEZIFIZIERT
Datum:Juni 2021
Erschienen in:CEAS Aeronautical Journal
Referierte Publikation:Ja
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Nein
Band:12
DOI:10.1007/s13272-021-00524-8
Seitenbereich:Seiten 621-632
Verlag:Springer
ISSN:1869-5590
Status:veröffentlicht
Stichwörter:Aeroelasticity, T-tail flutter, Quadratic mode shape components, CFD unsteady aerodynamics, Lienarized frequency domain CFD
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:Effizientes Luftfahrzeug
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L EV - Effizientes Luftfahrzeug
DLR - Teilgebiet (Projekt, Vorhaben):L - Digitale Technologien
Standort: Göttingen
Institute & Einrichtungen:Institut für Aeroelastik > Aeroelastische Simulationen
Hinterlegt von: Schäfer, Dominik
Hinterlegt am:06 Dez 2021 14:49
Letzte Änderung:23 Okt 2023 07:34

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