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Structural Design of an Instrumented Double-Swept Wind Tunnel Model

Lütke, Benjamin and Schmidt, Moritz and Sinske, Julian and Neumann, Jens (2015) Structural Design of an Instrumented Double-Swept Wind Tunnel Model. In: 20th International Conference on Composite Materials. International Conference on Composite Materials, Copenhagen.

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The design of a highly instrumented, double-swept CFRP wind tunnel model and its experimental setup are presented. A forced sinusoidal pitching motion is applied to the one-sided clamped helicopter rotor blade tip. Challenges of the structural design and the manufacturing process are addressed. A mold with inserts to check the leak-tightness of the pressure transducers and retain the half shells in the mold is presented. Insights in the finite element analysis (FEA) of the blade tip model are given. The strength analysis reveals peak stresses in the adhesive and the spar. The finite element model is validated with an experimental modal analysis. The experimental and numerical mode shapes and eigenfrequencies show an excellent agreement. The design goal of a very stiff lightweight model is met with the first eigenfrequency at 70 Hz. The results of the fluid-structure interaction simulation at Ma=0.4 show no significant differences for the global forces compared to the simulations with the rigid contour. However, the maximum tip deformation is up to 20 mm and a slight excitation of the first bending mode can be observed.

Item URL in elib:https://elib.dlr.de/100359/
Document Type:Conference or Workshop Item (Speech)
Title:Structural Design of an Instrumented Double-Swept Wind Tunnel Model
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Lütke, BenjaminAE-EXT, benjamin.luetke (at) dlr.deUNSPECIFIED
Schmidt, MoritzSHT BraunschweigUNSPECIFIED
Date:July 2015
Journal or Publication Title:20th International Conference on Composite Materials
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:Wind Tunnel Model, Finite Elements, Modal Analysis, Fluid-Structure Interaction Simulation, Strength Analysis, Helicopter Rotor Blade Tip
Event Title:International Conference on Composite Materials
Event Location:Copenhagen
Event Type:international Conference
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:rotorcraft
DLR - Research area:Aeronautics
DLR - Program:L RR - Rotorcraft Research
DLR - Research theme (Project):L - The Innovative Rotorcraft (old)
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity > Aeroelastic Experiments
Deposited By: Lütke, Benjamin
Deposited On:21 Dec 2015 15:05
Last Modified:31 Jul 2019 19:57

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