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Subsonic Ultra Green Aircraft Research: Phase II- Volume III-Truss Braced Wing Aeroelastic Test ReportThis Test Report summarizes the Truss Braced Wing (TBW) Aeroelastic Test (Task 3.1) work accomplished by the Boeing Subsonic Ultra Green Aircraft Research (SUGAR) team, which includes the time period of February 2012 through June 2014. The team consisted of Boeing Research and Technology, Boeing Commercial Airplanes, Virginia Tech, and NextGen Aeronautics. The model was fabricated by NextGen Aeronautics and designed to meet dynamically scaled requirements from the sized full scale TBW FEM. The test of the dynamically scaled SUGAR TBW half model was broken up into open loop testing in December 2013 and closed loop testing from January 2014 to April 2014. Results showed the flutter mechanism to primarily be a coalescence of 2nd bending mode and 1st torsion mode around 10 Hz, as predicted by analysis. Results also showed significant change in flutter speed as angle of attack was varied. This nonlinear behavior can be explained by including preload and large displacement changes to the structural stiffness and mass matrices in the flutter analysis. Control laws derived from both test system ID and FEM19 state space models were successful in suppressing flutter. The control laws were robust and suppressed flutter for a variety of Mach, dynamic pressures, and angle of attacks investigated.
Document ID
20150017040
Document Type
Contractor Report (CR)
Authors
Bradley, Marty K. (Boeing Research and Technology Huntington Beach, CA, United States)
Allen, Timothy J. (Boeing Research and Technology Huntington Beach, CA, United States)
Droney, Christopher (Boeing Research and Technology Huntington Beach, CA, United States)
Date Acquired
September 3, 2015
Publication Date
April 1, 2014
Subject Category
Aircraft Design, Testing and Performance
Report/Patent Number
NASA/CR-2015-218704
NF1676L-21006
Funding Number(s)
CONTRACT_GRANT: NNL08AA16B
WBS: WBS 081876.01.07.02
TASK: NNL11AA00T
Distribution Limits
Public
Copyright
Public Use Permitted.

Available Downloads

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IDRelationTitle20150017039See AlsoSubsonic Ultra Green Aircraft Research: Phase 220120009038See AlsoSubsonic Ultra Green Aircraft Research Phase II: N+4 Advanced Concept Development20150017036See AlsoSubsonic Ultra Green Aircraft Research