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Uncertainty of Videogrammetric Techniques used for Aerodynamic TestingThe uncertainty of videogrammetric techniques used for the measurement of static aeroelastic wind tunnel model deformation and wind tunnel model pitch angle is discussed. Sensitivity analyses and geometrical considerations of uncertainty are augmented by analyses of experimental data in which videogrammetric angle measurements were taken simultaneously with precision servo accelerometers corrected for dynamics. An analysis of variance (ANOVA) to examine error dependence on angle of attack, sensor used (inertial or optical). and on tunnel state variables such as Mach number is presented. Experimental comparisons with a high-accuracy indexing table are presented. Small roll angles are found to introduce a zero-shift in the measured angles. It is shown experimentally that. provided the proper constraints necessary for a solution are met, a single- camera solution can he comparable to a 2-camera intersection result. The relative immunity of optical techniques to dynamics is illustrated.
Document ID
Acquisition Source
Langley Research Center
Document Type
Preprint (Draft being sent to journal)
Burner, A. W.
(NASA Langley Research Center Hampton, VA United States)
Liu, Tianshu
(NASA Langley Research Center Hampton, VA United States)
DeLoach, Richard
(NASA Langley Research Center Hampton, VA United States)
Date Acquired
September 7, 2013
Publication Date
January 1, 2002
Subject Category
Report/Patent Number
AIAA Paper 2002-2794
Meeting Information
Meeting: 22nd AIAA Aerodynamic Measurement Technology and Ground Testing Conference
Location: Saint Louis, MO
Country: United States
Start Date: June 24, 2002
End Date: June 26, 2002
Sponsors: American Inst. of Aeronautics and Astronautics
Distribution Limits
Public Use Permitted.
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