Accession Number : ADA119704

Title :   Equivalent System Verification and Evaluation of Augmentation Effects on Fighter Approach and Landing Flying Qualities. Volume 2. Program Plan, Test Data and Analysis.

Descriptive Note : Final rept. Jul 78-Jul 81,

Corporate Author : CALSPAN CORP BUFFALO NY FLIGHT RESEARCH DEPT

Personal Author(s) : Smith, Rogers E ; Hodgkinson, John ; Snyder, Richard C

PDF Url : ADA119704

Report Date : Sep 1981

Pagination or Media Count : 375

Abstract : An approach and landing evaluation program was performed using the AFWAL/Calspan NT-33 variable stability aircraft to test the suitability of representing aircraft with complex flight control systems by an equivalent simplified system. An evaluation of the equivalent systems includes effects of time delay, correlation with Pilot Ratings and comparison of frequency response characteristics for both high order and low order configurations. The analytical descriptions of the configurations have been plotted in Bode diagrams with the corresponding step time histories. The effects of gain parameters on the matching equivalent systems are presented. A fast Fourier Transform method has been applied to flight time histories for analysis in the frequency response mode. The resulting response characteristics also serve as a check on the predicted responses as defined by the analytical descriptions programmed in the NT-33. The equivalent systems data have been evaluated with the Neal and Smith closed-loop analysis technique. For the longitudinal evaluations, the validity of the equivalent system approach for evaluation of the flying qualities of complex aircraft was generally verified. The data for the lateral equivalent system evaluations were inconclusive. (Author)

Descriptors :   *AIRCRAFT LANDINGS, *APPROACH, FLIGHT CONTROL SYSTEMS, TIME INTERVALS, CLOSED LOOP SYSTEMS, FREQUENCY RESPONSE, DEGRADATION, CORRELATION TECHNIQUES, AUGMENTATION, MAN MACHINE SYSTEMS, PILOTS, FLIGHT PATHS, FLIGHT MANEUVERS, TRADE OFF ANALYSIS, INTERFACES, VALIDATION, TEST AND EVALUATION, ADVANCED WEAPONS, FIGHTER AIRCRAFT

Subject Categories : Military Aircraft Operations

Distribution Statement : APPROVED FOR PUBLIC RELEASE