Videogrammetry for Model Geometry

1
In-Flight Aeroelastic Measurement Technique
Non-Metric positioning system
Three-Axis accelerometer system
Force Positioning System
Balance (Inside Fixture)
Weight Application Rod

• Accomplishments
• In-flight measurements on
• F/A-18 Research aircraft
• M 0.95 at 15,000 ft.
• Spanwise wing bending
• Time-histories of maneuver

• Methodology
• Extract image coordinates
• Manual
• Centroids
• Edges or lines
• Digital image correlation
• Transform from image to object
• Subtract out reference condition

• Attributes
• Robust
• Low cost
• Flexible to measurement needs
• High precision possible
• Simple targeting
• Time-histories
• ( better than current methods)

• Future capabilities
• Entire flight sequence
• No special targets
• Control surface geometry

NASA Langley Research Center and NASA Dryden
Flight Research Center (within Active Aeroelastic
Wing Program)
Reference In-Flight Aeroelastic Measurement
Technique Development, SPIE Optical Diagnostics
for Fluids, Solids, and Combustion II, paper
5191-31, San Diego, 3-4 August 2003
Contact NASA-Langley Gary
Fleming Email g.a.fleming_at_larc.nasa.gov