An Optimal Deconvolution Method for Reconstructing Pneumatically Distorted Near-Field Sonic Boom Pressure Measurement. NASA Technical Paper 4000, Research and Engineering, NASA Dryden Flight Research Center
Whitmore, Stephen A. and Haering Jr., Edward A. and Ehernberger, L.J. (1996) An Optimal Deconvolution Method for Reconstructing Pneumatically Distorted Near-Field Sonic Boom Pressure Measurement. NASA Technical Paper 4000, Research and Engineering, NASA Dryden Flight Research Center.
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Abstract
In-flight measurements of the SR-71 near-field sonic boom were obtained by an F-16XL airplane at flightpath separation distances from 40 to 740 ft. Twenty-two signatures were obtained from Mach 1.60 to Mach 1.84 and altitudes from 47,600 to 49,150 ft. The shock wave signatures were measured by the total and static sensors on the F-16XL noseboom. These near-field signature measurements were distorted by pneumatic attenuation in the pitot-static system. The near-field pressure signatures were corrected by modeling the magnitude and phase of the pitot-static sensors and accounting for their effects using optimal deconvolution. Measurement system magnitude and phase characteristics were determined from ground-based step-response tests and extrapolated to flight conditions using analytical models. Deconvolution was implemented using Fourier transform methods. Comparisons of the shock wave signatures reconstructed from the total and static pressure data are presented. The good agreement achieved gives confidence of the quality of the reconstruction analysis. Although originally developed to reconstruct the sonic boom signatures from SR-71 sonic boom flight tests, the methods presented here generally apply to other types of highly attenuated or distorted pneumatic measurements.
| EPrint Type: | Other |
|---|---|
| Keywords: | Airdata, Deconvolution, Flight test, F-16XL aircraft, Pressure sensing, Shock wave signatures, Sonic boom, SR-71 aircraft |
| Subjects: | (01 - 09) Aeronautics: (05) Aircraft Design, Testing And Performance Aircraft/Project: SR-71 Blackbird Aircraft/Project: F-16XL |
| ID Code: | 1949 |
| Deposited On: | 10 April 2009 |
| Additional Information: | 39 pages. |
