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

Schäfer, Dominik (2020) T-tail flutter simulations with regard to quadratic mode shape components. DLRK 2020 - Deutscher Luft- und Raumfahrtkongress, 01.-03. Sep. 2020, Online.

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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.

Item URL in elib:https://elib.dlr.de/139614/
Document Type:Conference or Workshop Item (Speech)
Title:T-tail flutter simulations with regard to quadratic mode shape components
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Schäfer, DominikD.Schaefer (at) dlr.dehttps://orcid.org/0000-0002-2042-7525
Date:September 2020
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:aeroelasticity, T-tail flutter, quadratic mode shape components, CFD unsteady aerodynamics, linearized frequency domain CFD
Event Title:DLRK 2020 - Deutscher Luft- und Raumfahrtkongress
Event Location:Online
Event Type:national Conference
Event Dates:01.-03. Sep. 2020
Organizer:DGLR - Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal Oberath e.V.
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Simulation and Validation (old)
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity > Aeroelastic Simulation
Deposited By: Schäfer, Dominik
Deposited On:18 Dec 2020 17:03
Last Modified:18 Dec 2020 17:03

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