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Record Details

Record 45 of 7578
Flutter of High-Speed Civil Transport Flexible Semispan Model: Time-Frequency Analysis
Author and Affiliation:
Chabalko, Christopher C.(Virginia Polytechnic Inst. and State Univ., Blacksburg, VA, United States)
Hajj, Muhammad R.(Virginia Polytechnic Inst. and State Univ., Blacksburg, VA, United States)
Silva, Walter A.(NASA Langley Research Center, Hampton, VA, United States)
Abstract: Time/frequency analysis of fluctuations measured by pressure taps and strain gauges in the experimental studies of the flexible semispan model of a high-speed civil transport wing configuration is performed. The interest is in determining the coupling between the aerodynamic loads and structural motions that led to the hard flutter conditions and loss of the model. The results show that, away from the hard flutter point, the aerodynamic loads at all pressure taps near the wing tip and the structural motions contained the same frequency components. On the other hand, in the flow conditions leading to the hard flutter, the frequency content of the pressure fluctuations near the leading and trailing edges varied significantly. This led to contribution to the structural motions over two frequency ranges. The ratio of these ranges was near 2:1, which suggests the possibility of nonlinear structural coupling.
Publication Date: May 01, 2006
Document ID:
20080015923
(Acquired Apr 28, 2008)
Subject Category: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
Report/Patent Number: AIAA Paper 2004-1856
Document Type: Journal Article
Publication Information: Journal of Aircraft; Volume 43; No. 3; 743-748
Contract/Grant/Task Num: F49620-03-1-0206; VT-03-01
Financial Sponsor: NASA Langley Research Center; Hampton, VA, United States
Air Force Office of Scientific Research, Bolling AFB; Washington, DC, United States
National Inst. of Aerospace Associates; Hampton, VA, United States
Organization Source: Virginia Polytechnic Inst. and State Univ.; Blacksburg, VA, United States
NASA Langley Research Center; Hampton, VA, United States
Description: 6p; In English; Original contains black and white illustrations
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: AEROELASTICITY; SEMISPAN MODELS; FLUTTER; TIME SERIES ANALYSIS; OSCILLATIONS; AERODYNAMIC LOADS; STRUCTURAL STRAIN; UNSTEADY AERODYNAMICS; WIND TUNNEL MODELS; MACH NUMBER; STRAIN GAGES; DYNAMIC PRESSURE; AIRCRAFT DESIGN; FLUTTER ANALYSIS; STRUCTURAL DESIGN; NONLINEARITY
Miscellaneous Notes: Presented as Paper 2004-1856 at the AIAA/ASME/ASCE/AHS/ASC 45th Structures, Structural Dynamics, and Materials Conference, Palm Springs, CA, 19-22 April 2004
Availability Source: Other Sources
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