Stability and Control Estimation Flight Test Results for the SR-71 Aircraft With Externally Mounted Experiments
Moes, Timothy R. and Iliff, Kenneth (2002) Stability and Control Estimation Flight Test Results for the SR-71 Aircraft With Externally Mounted Experiments. Technical Report NASA/TP-2002-210718, Research Engineering, NASA Dryden Flight Research Center.
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Abstract
A maximum-likelihood output-error parameter estimation technique is used to obtain stability and control derivatives for the NASA Dryden Flight Research Center SR-71A airplane and for configurations that include experiments externally mounted to the top of the fuselage. This research is being done as part of the envelope clearance for the new experiment configurations. Flight data are obtained at speeds ranging from Mach 0.4 to Mach 3.0, with an extensive amount of test points at approximately Mach 1.0. Pilot-input pitch and yaw-roll doublets are used to obtain the data. This report defines the parameter estimation technique used, presents stability and control derivative results, and compares the derivatives for the three configurations tested. The experimental configurations studied generally show acceptable stability, control, trim, and handling qualities throughout the Mach regimes tested. The reduction of directional stability for the experimental configurations is the most significant aerodynamic effect measured and identified as a design constraint for future experimental configurations. This report also shows the significant effects of aircraft flexibility on the stability and control derivatives.
| EPrint Type: | NASA Technical Publication |
|---|---|
| Keywords: | Control derivatives, Maximum likelihood estimates, Parameter identification, SR-71, Stability derivatives |
| Subjects: | Aircraft/Project: SR-71 Blackbird (01 - 09) Aeronautics: (08) Aircraft Stability And Control |
| ID Code: | 34 |
| Deposited On: | 18 May 2004 |
| Additional Information: | 96 pages. |
