van 't Hoff, Stefan und Fonte, Federico und Soal, Keith Ian und Schneider, Oliver und Kapteijn, Kees (2024) Whirl Flutter Testing of ATTILA Tiltrotor Testbed - Initial Results. In: 80th Annual Vertical Flight Society Forum and Technology Display, FORUM 2024. Vertical Flight Society 80th Annual Forum & Technology Display, 2024-05-07 - 2024-05-09, Montréal, Quebec, Kanada. doi: 10.4050/F-0080-2024-1117. ISBN 978-171389794-1.
PDF
- Nur DLR-intern zugänglich
2MB |
Offizielle URL: https://proceedings.vtol.org/80/test-and-evaluation/whirl-flutter-testing-of-attila-tiltrotor-testbed---initial-results
Kurzfassung
This paper presents the preliminary results of the recent whirl flutter wind tunnel test campaign performed within the Advanced Testbed for TILtrotor Aeroelastics (ATTILA) project. The Froude-scale ATTILA testbed consists of a semi-span wing with powered tip-mounted proprotor reflecting the proprietary design of the Next Generation Civil TiltRotor (NGCTR). An overview of the ATTILA testbed, wind tunnel test procedures, team organisation and preliminary flutter results are presented. In line with pre-entry dynamic characterization tests, the wind-on test activities in the DNW Large Low-speed Facility (LLF) revealed notable force-dependent nonlinearity in the modal characteristics of, particularly, the wing torsion mode. Further dimensionality was added by early observations that damping in the rotor gimbal degree of freedom, attributed to stiction in the blade pitch mechanism, had the potential to substantially contribute to the damping of the fundamental wing-pylon modes. Nevertheless, the parallel exploitation of multiple monitoring and online modal estimation methodologies enabled a robust identification and safe test progression. The critical flutter mode was found to be configuration dependent, with the wing chord bending mode generally being marginally stable throughout most of the wind speed range, and the wing torsion mode displaying a sharp trend towards negative damping at higher speeds. Despite technical challenges, valuable test data was gathered to advance the experimental methods and support validation of the numerical tools used to obtained clearance for high-speed flight testing of the full-scale NGCTR Technology Demonstrator.
elib-URL des Eintrags: | https://elib.dlr.de/205964/ | ||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Dokumentart: | Konferenzbeitrag (Vortrag) | ||||||||||||||||||||||||
Titel: | Whirl Flutter Testing of ATTILA Tiltrotor Testbed - Initial Results | ||||||||||||||||||||||||
Autoren: |
| ||||||||||||||||||||||||
Datum: | Mai 2024 | ||||||||||||||||||||||||
Erschienen in: | 80th Annual Vertical Flight Society Forum and Technology Display, FORUM 2024 | ||||||||||||||||||||||||
Referierte Publikation: | Ja | ||||||||||||||||||||||||
Open Access: | Nein | ||||||||||||||||||||||||
Gold Open Access: | Nein | ||||||||||||||||||||||||
In SCOPUS: | Ja | ||||||||||||||||||||||||
In ISI Web of Science: | Nein | ||||||||||||||||||||||||
DOI: | 10.4050/F-0080-2024-1117 | ||||||||||||||||||||||||
ISBN: | 978-171389794-1 | ||||||||||||||||||||||||
Status: | veröffentlicht | ||||||||||||||||||||||||
Stichwörter: | Whirl Flutter, Aeroelasticity | ||||||||||||||||||||||||
Veranstaltungstitel: | Vertical Flight Society 80th Annual Forum & Technology Display | ||||||||||||||||||||||||
Veranstaltungsort: | Montréal, Quebec, Kanada | ||||||||||||||||||||||||
Veranstaltungsart: | internationale Konferenz | ||||||||||||||||||||||||
Veranstaltungsbeginn: | 7 Mai 2024 | ||||||||||||||||||||||||
Veranstaltungsende: | 9 Mai 2024 | ||||||||||||||||||||||||
HGF - Forschungsbereich: | Luftfahrt, Raumfahrt und Verkehr | ||||||||||||||||||||||||
HGF - Programm: | Luftfahrt | ||||||||||||||||||||||||
HGF - Programmthema: | Effizientes Luftfahrzeug | ||||||||||||||||||||||||
DLR - Schwerpunkt: | Luftfahrt | ||||||||||||||||||||||||
DLR - Forschungsgebiet: | L EV - Effizientes Luftfahrzeug | ||||||||||||||||||||||||
DLR - Teilgebiet (Projekt, Vorhaben): | L - Virtuelles Flugzeug und Validierung | ||||||||||||||||||||||||
Standort: | Braunschweig , Göttingen | ||||||||||||||||||||||||
Institute & Einrichtungen: | Institut für Aeroelastik > Strukturdynamik und Systemidentifikation Institut für Flugsystemtechnik > Hubschrauber | ||||||||||||||||||||||||
Hinterlegt von: | Soal, Dr Keith Ian | ||||||||||||||||||||||||
Hinterlegt am: | 27 Aug 2024 16:45 | ||||||||||||||||||||||||
Letzte Änderung: | 09 Sep 2024 12:43 |
Nur für Mitarbeiter des Archivs: Kontrollseite des Eintrags