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Concept of a variable chord-extension

Balzarek, Christoph und Riemenschneider, Johannes und Majeti, Rohin Kumar (2020) Concept of a variable chord-extension. In: 46th European Rotorcraft Forum, ERF 2020, 1 (1), Seiten 113-122. Curran Associates, Inc. ( Mar 2021 ). ERF 2020, 2020-09-08 - 2020-09-11, Moskau. ISBN 978-171382358-2.

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Kurzfassung

Among all kinds of aircraft, helicopters are standing out due to their capability for both forward flight and hovering. Thisrange of flight conditions requires a special blade design, resulting in a rotor blade geometry, which represents acompromise between the different flight conditions. Morphing rotor blades could address this issue, by changing the rotorblade shape according to the demands of the current flight state. From rotor dynamic calculations it is known, that longerchord length at the blade root and increased pre-twist would increase the performance in hover [1,3], whereas shorter chordand less twist are beneficial for fast forward flight.Based on this assumption, a structural concept has been worked out for a blade design with a variable chord length in therotor root region. The model, which belongs to that concept forms the basis of a performance calculation.The structural concept consists of a pivot point at around 60% R and the chord extension is linearly increasing all theway to the blade root at 22% R. In this region an auxiliary spar is dividing the blade into a conventional rigid front part and amorphing rear part, whose structural design is the main focus of this paper. It consists of two components: a flexible skinmade of rubber-like EPDM material, which is reinforced in the spanwise direction by fibers, as well as an inner supportstructure.The design drivers for the skin thickness are shape accuracy on one end and actuator force to extend the mechanism andstretch the skin on the other end. The underlying support structure consists of vertical GFRP extending in span wisedirection. Design parameters for those webs are the distance between webs, which relates to the skin design, as well as thethickness of the members, which influences the overall stiffness of the design. The publication will present a workflow, inwhich the rotor is being structurally designed coming all the way from a generic CAD model, considering cg location as wellas elastic deformation of the elastic skin and calculating

elib-URL des Eintrags:https://elib.dlr.de/143836/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Concept of a variable chord-extension
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Balzarek, Christophchristoph.balzarek (at) dlr.dehttps://orcid.org/0000-0003-4889-0340NICHT SPEZIFIZIERT
Riemenschneider, JohannesJohannes.Riemenschneider (at) dlr.dehttps://orcid.org/0000-0001-5485-8326NICHT SPEZIFIZIERT
Majeti, Rohin KumarRohin.Majeti (at) dlr.dehttps://orcid.org/0000-0003-0634-8051NICHT SPEZIFIZIERT
Datum:August 2020
Erschienen in:46th European Rotorcraft Forum, ERF 2020
Referierte Publikation:Ja
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Nein
Band:1
Seitenbereich:Seiten 113-122
Herausgeber:
HerausgeberInstitution und/oder E-Mail-Adresse der HerausgeberHerausgeber-ORCID-iDORCID Put Code
Russian Helicopters, .info (at) rus-helicopters.comNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Verlag:Curran Associates, Inc. ( Mar 2021 )
Name der Reihe:46th European Rotorcraft Forum (ERF 2020)
ISBN:978-171382358-2
Status:veröffentlicht
Stichwörter:SABRE, morphing, rotor, helicopter, trailing edge, chord extension
Veranstaltungstitel:ERF 2020
Veranstaltungsort:Moskau
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:8 September 2020
Veranstaltungsende:11 September 2020
Veranstalter :Russian Helicopters
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:Hubschrauber
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L RR - Rotorcraft Research
DLR - Teilgebiet (Projekt, Vorhaben):L - Der Innovative Drehflügler (alt)
Standort: Braunschweig
Institute & Einrichtungen:Institut für Faserverbundleichtbau und Adaptronik > Adaptronik
Hinterlegt von: Balzarek, Christoph Gerhard
Hinterlegt am:13 Sep 2021 07:33
Letzte Änderung:24 Apr 2024 20:43

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