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The aeroelastic behaviour of a forward-swept wing configuration with focus on engine gyroscopics and T-tail flutter

Waitz, Stefan (2017) The aeroelastic behaviour of a forward-swept wing configuration with focus on engine gyroscopics and T-tail flutter. In: IFASD 2017 - International Forum on Aeroelasticity and Structural Dynamics. IFASD 2017 - International Forum on Aeroelasticity and Structural Dynamics, 25.-28. Jun. 2017, Como, Italien. ISBN 978-88-97576-28-0

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Abstract

Since more and more modern civil aircraft for reasons of fuel efficiency and environ- mental aspects are equipped with UHBR-engines, the need to tackle specific engine related dynamic problems has occurred. The request for UHBR-engines with high by-pass ratio numbers and with their intrinsic advantages of economic fuel consumption and lower acoustic emission asks for enhanced prediction capabilities. Beside the energetic benefit such engines add to the aircraft design their rotating large diameter fans can influence the dynamic behaviour of the complete elastic aircraft fuselage in a very unfavourable manner. Especially in the scenario when large rotating engine masses are to be combined with elastic suspension structures the possible occurrence of structural vibration problems can be avoided by taking the gyroscopic effects into account. As another important engine related question the modelling and the impact of the engine thrust is highlighted by integration of the follower force induced terms into the dynamical simulation model. A further approach towards lower fuel consumption is the drag reduction of the airplane. This can be realized by keeping the flow field around the wing surfaces laminar as much as possible. With the ALLEGRA-S configuration a short and medium range aircraft has been designed with the aim of drag reduction by keeping the wing flow laminar as long as possible. Together with laminar aerodynamic wing airfoil sections the forward sweep of the wings has a favourable influence on the laminar character of the wing flow. The forward swept wings as well as the T-tail empennage and the backward position of the engine nacelles on both sides of the fuselage also have a formative influence on the flutter behaviour and thus the stability margins of the design. The flutter behaviour of several baseline mass configurations has been examined. Important questions with regard to the enhancement of the flutter model and the impact on structural dynamics and aeroelasticity are treated in this work. For example by introducing additional d.o.f. coupling into the aeroelastic model the component correction terms have influenced particular flutter eigenmodes and caused (minor) deviations in flutter frequencies and velocities.

Item URL in elib:https://elib.dlr.de/115085/
Document Type:Conference or Workshop Item (Speech)
Title:The aeroelastic behaviour of a forward-swept wing configuration with focus on engine gyroscopics and T-tail flutter
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Waitz, Stefanstefan.waitz (at) dlr.deUNSPECIFIED
Date:29 July 2017
Journal or Publication Title:IFASD 2017 - International Forum on Aeroelasticity and Structural Dynamics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
ISBN:978-88-97576-28-0
Status:Published
Keywords:forward sweep, T-tail flutter, gyroscopics, engine thrust, follower force, asymmetric eigenmode, engine aeroelasticity, critical speed, flutter frequency, laminar flow
Event Title:IFASD 2017 - International Forum on Aeroelasticity and Structural Dynamics
Event Location:Como, Italien
Event Type:international Conference
Event Dates:25.-28. Jun. 2017
Organizer:Politechnico Milano, Department of Aerospace Science and Technology
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 - Concepts and Integration
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity > Aeroelastic Simulation
Deposited By: Waitz, Dr.-Ing. Stefan
Deposited On:09 Nov 2017 09:57
Last Modified:09 Nov 2017 09:57

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