contact nasa-langley: gary fleming email: [email protected]
DESCRIPTION
Long-term vision. Aeroelastic characterization is vital to future aerospace vehicle design, but is costly, non-routine, and requires significant setup and aircraft adaptations. Recently a wind tunnel technique has been adapted for in-flight without these limitations. - PowerPoint PPT PresentationTRANSCRIPT
ContactNASA-Langley: Gary FlemingEmail: [email protected]
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
In-Flight Aeroelastic Measurement Technique
Aeroelastic characterization is vital to future aerospace vehicle design,but is costly, non-routine, and requires significant setup and aircraft adaptations.
Recently a wind tunnel technique has been adapted for in-flight without these limitations
Non-Metric positioning system
Three-Axis accelerometer system
Force Positioning System
Weight Application Rod
Balance (Inside Fixture)
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)
Methodology• Extract image coordinates– Manual – Centroids– Edges or lines– Digital image correlation• Transform from image to object• Subtract out reference condition
Accomplishments• In-flight measurements on F/A-18 Research aircraft• M = 0.95 at 15,000 ft.• Spanwise wing bending• Time-histories of maneuver
Complete time-histories of aerodynamically induced twist and deflection from take-off to landing, with next-day delivery of reduced data
Long-term vision