Accession Number : AD0787645

Title :   A Comparison and Evaluation of Two Methods of Extracting Stability Derivatives from Flight Test Data.

Descriptive Note : Final rept.,

Corporate Author : AIR FORCE FLIGHT TEST CENTER EDWARDS AFB CA

Personal Author(s) : Kirster, Paul W. ; Ash, Lawrence G.

Report Date : MAY 1974

Pagination or Media Count : 86

Abstract : Two methods for extracting stability derivatives from flight data are compared. A modified Newton-Raphson minimization technique and a digital-analog (hybrid) matching technique were used to analyze the same data maneuvers obtained from two aircraft. About 55 maneuvers of an F-111E aircraft were analyzed over a Mach number range of 0.3 to 2.0 and an angle of attack range of 3 to 19 degrees. About 15 maneuvers were analyzed for the X-24A lifting body at Mach numbers of 0.8 and 0.9 and an angle of attack range of 4 to 13 degrees. Stability derivatives were extracted from these maneuvers, and the results from the two techniques along with wind tunnel results were compared. (Modified author abstract)

Descriptors :   *JET FIGHTERS, *LIFTING BODIES, *STABILITY, FLIGHT TESTING, AERONAUTICS, SIDESLIP, AERODYNAMIC CONTROL SURFACES, CONFIDENCE LEVEL, DYNAMIC PROGRAMMING.

Subject Categories : Aerodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE