Actions for Aerodynamic Spring and Damping of Free-Pitching Tips on a Semispan Wing

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Aerodynamic Spring and Damping of Free-Pitching Tips on a Semispan Wing

Author
Young, Larry A.
Published
[1992].
Physical Description
1 electronic document
Additional Creators
Martin, Daniel M.
Online Version

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Unclassified, Unlimited, Publicly available.
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Summary
A test was conducted in the NASA Ames 7- by 10-Foot Wind Tunnel to derive aerodynamic spring and damping estimates for free-pitching tips on a semispan wing. The test model was a rectangular planform semispan wing with wing tips that had a single rigid-body pitch degree of freedom with respect to the inboard wing. A number of different tip planform geometries were tested, incorporating a range of quarter-chord sweep angles and taper ratios. The wing-tip dynamic response characteristics were measured at several wing angles of attack and tunnel dynamic pressures. The tip oscillations were initiated by releasing the tips from prescribed angles of attack. A new method to isolate Coulomb damping from aerodynamic damping from these tip-motion time histories is developed and applied. Correlations were performed between the experimentally derived wing-tip aerodynamic spring and damping values and predictions from a semiempirical analysis based on steady-state tip aerodynamic loads.
Other Subject(s)
Collection
NASA Technical Reports Server (NTRS) Collection.
Note
Document ID: 20000023168.
AIAA Paper 92-2111.
Dynamics Specialist Conference; 16-17 Apr. 1992; Dallas, TX; United States.
Terms of Use and Reproduction
Copyright, Distribution as joint owner in the copyright.
View MARC record | catkey: 15641852