AASERT: Adaptive Control for Diagnosis of Transient Vortex Interactions.
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 29, 1997
- Accession Number
- ADA322308
Entities
People
- David Dishman
- John C. Magill
- Kevin G. Peterson
- Leigh-ann Darden
- Narayanan M. Komerath
Organizations
- Georgia Tech