The multiple-function multi-input/multi-output digital controller system for the AFW wind tunnel modelA real-time multiple-function digital controller system was developed for the Active Flexible Wing (AFW) Program. The digital controller system (DCS) allowed simultaneous execution of two control laws: flutter suppression and either roll trim or a rolling maneuver load control. The DCS operated within, but independently of, a slower host operating system environment, at regulated speeds up to 200 Hz. It also coordinated the acquisition, storage, and transfer of data for near real-time controller performance evaluation and both open- and closed-loop plant estimation. It synchronized the operation of four different processing units, allowing flexibility in the number, form, functionality, and order of control laws, and variability in selection of sensors and actuators employed. Most importantly, the DCS allowed for the successful demonstration of active flutter suppression to conditions approximately 26 percent (in dynamic pressure) above the open-loop boundary in cases when the model was fixed in roll and up to 23 percent when it was free to roll. Aggressive roll maneuvers with load control were achieved above the flutter boundary.
Document ID
19920053031
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Hoadley, Sherwood T. (NASA Langley Research Center Hampton, VA, United States)
Mcgraw, Sandra M. (Lockheed Engineering and Sciences Co. Hampton, VA, United States)