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Conceptual Study on Large Scale Morphing in Helicopter Rotorblades

Reis dos Santos Marques, Joana Catarina and Kalow, Steffen and Riemenschneider, Johannes (2013) Conceptual Study on Large Scale Morphing in Helicopter Rotorblades. Master's. DLR-Interner Bericht. DLR-IB 131-2013/98, 85 S. (Unpublished)

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Abstract

Active rotor technologies have labeled the evolution of rotary-wing aircraft over the last years or even decades. The advent of new materials which have not only incorporated the traditional structural function but also an actuation function in response to a stimulus, enabled major ad-vances by being inserted directly on the actuation surface. The present master thesis introduces a feasibility study to investigate the potential of an anhedraltip on a rotor blade actuated by one of the actuators available on the market. The study is based on a numerical study conducted by ONERA where an optimization of the rotor aerodynamic performance was achieved in terms of the Figure of Merit for an anhedral tip of 30 deg. Pneumatic artificial muscles (PAM) are the selected actuators after a careful revision of the a vantages and disadvantages of each considered actuator. A detailed characterization of the PAM is per-formed through (1) a free displacement test, (2) a blocked force test and (3) spring contraction tests. A Working Diagram is proposed for the selected PAM from the results of these tests. A _nal test is conducted on the laboratory to measure the displacement of the PAM when different constant masses (to which correspond different loads) are suspended on the PAM. The whirl tests are conducted in the rotor tower of DLR (Deutsches Zentrum für Luft- und Raumfahrt) Braunschweig. A U-profile is used instead of a real blade allowing the permanent access to the arrangement. The hinge system is design in such way that the contraction of the PAM promotes the deection of the tip allocated in the last 20% of the blade. A maximum anhedral tip deection of 4:5 deg is achieved for 500 rpm.

Item URL in elib:https://elib.dlr.de/88622/
Document Type:Monograph (DLR-Interner Bericht, Master's)
Title:Conceptual Study on Large Scale Morphing in Helicopter Rotorblades
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Reis dos Santos Marques, Joana CatarinaTecnico LisboaUNSPECIFIED
Kalow, SteffenUNSPECIFIEDUNSPECIFIED
Riemenschneider, JohannesUNSPECIFIEDUNSPECIFIED
Date:December 2013
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Number of Pages:85
Status:Unpublished
Keywords:Pneumatic Artificial Muscles (PAM), Large Scale Morphing Rotorblades, Rotor Performance Optimization, Anhedral Morphing Concept
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Rotorcraft (old), Aircraft Research (old)
DLR - Research area:Aeronautics
DLR - Program:L RR - Rotorcraft Research, L AR - Aircraft Research
DLR - Research theme (Project):L - The Innovative Rotorcraft (old), L - Concepts & Integration (old)
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Adaptronics
Deposited By: Böhringer-Thelen, Isolde
Deposited On:12 May 2014 08:20
Last Modified:12 May 2014 08:20

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