This research effort aims to develop software control algorithms that will correct for roll reversal before it happens. Roll reversal occurs when an aircraft is steered in one direction but rolls the opposite way due to aerodynamic conditions. The problem often compounds as a pilot attempts to correct for the motion by over-steering in the original direction, leading to uncontrollable roll. Unexpected yaw and subsequent roll reversal has caused the loss of high-speed, lifting body–like vehicles. The team has employed novel predictive software within adaptive controller technology to detect conditions likely to result in aircraft roll reversal and then automate compensating maneuvers to avoid catastrophic loss.
Work completed: University of Michigan’s retrospective cost model refinement (RCMR) control algorithm has been integrated into a flight simulator and tested with prerecorded, open-source parameter data, which replicates the roll reversal anomaly.
Looking ahead: Next steps involve upgrading the RCMR code to account for a six-degree-of-simulation environment (forward/back, up/ down, left/right, pitch, yaw, and roll) with eventual application in a flight test environment.
Partners: University of Michigan, other government research agencies, and aerospace firms.
|Organizations Performing Work||Role||Type||Location|
|Armstrong Flight Research Center (AFRC)||Lead Organization||NASA Center||Edwards, California|
|University of Michigan||Supporting Organization||Academia||Ann Arbor, Michigan|