Accession Number : ADA322308

Title :   AASERT: Adaptive Control for Diagnosis of Transient Vortex Interactions.

Descriptive Note : Final technical rept. Jan 93-Nov 96,

Corporate Author : GEORGIA INST OF TECH ATLANTA SCHOOL OF AEROSPACE ENGINEERING

Personal Author(s) : Komerath, Narayanan M. ; Magill, John C. ; Darden, Leigh-Ann ; Dishman, David ; Peterson, Kevin G.

PDF Url : ADA322308

Report Date : 29 JAN 1997

Pagination or Media Count : 81

Abstract : Two inventions enabled substantial progress on related problems. The Wind Driven Dynamic Manipulator enables high rate, arbitrary trajectory simulation of aircraft maneuvers in the wind tunnel. Adaptive control has been used to converge accurately to specified pitch histories using this light and flexible robotic device, powered by wind energy. Active stabilization has been used to develop a pitch roll yaw manipulator. Laser sheet imaging during pitch yaw maneuvers of a YF-22 model showed transient vortex interactions even during quasi static motions. Dynamic pitch derivatives were measured using system identification and periodic excitation. Static and transient force measurement are feasible. The Stagnation Point Actuator (SPA) enables suppression and amplification of forebody vortex asymmetry, providing effective roll yaw control at high angle of attack. The SPA produces roll and yaw coefficients similar to those of blowing and strakes, with continuous, high rate control of the asymmetry. Wing rock has been induced and suppressed with high repeatability. Piecewise linear frequency domain transfer functions have been used to model the response of the pressure and the roll moment to SPA deflection. Various time scales are identified.

Descriptors :   *WIND TUNNEL TESTS, *FLIGHT SIMULATION, ROLL, ADAPTIVE CONTROL SYSTEMS, ATTITUDE CONTROL SYSTEMS, PITCH(INCLINATION), YAW, VORTICES, ASYMMETRY, AERODYNAMIC LOADING, ACTUATORS, FLIGHT MANEUVERS, MANIPULATORS, STRAKES, STAGNATION POINT, ATTITUDE(INCLINATION).

Subject Categories : Aerodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE