Aeronautics and astronautics – Aircraft control
Patent
1991-11-13
1994-12-20
Focarino, Margaret A.
Aeronautics and astronautics
Aircraft control
244 76R, 244195, 310328, B64G 500
Patent
active
053740114
ABSTRACT:
An adaptive sheet structure with distributed strain actuators is controlled by a dynamic compensator that implements multiple input, multiple output control laws derived by model-based, e.g., Linear Quadratic Gaussian (LQG) control methodologies. An adaptive lifting surface is controlled for maneuver enhancement, flutter and vibration suppression and gust and load alleviation with piezoceramic elements located within, or enclosed by sheets of composite material at a particular height above the structure's neutral axis. Sensors detect the amplitudes of lower order structural modes, and distributed actuators drive or damp these and other modes. The controller is constructed from an experimental and theoretical model using conventional control software, with a number of event recognition patterns and control algorithms programmed for regulating the surface to avoid instabilities. The number of control states of the compensator is then reduced by removing states having negligible effects on the plant, and a smaller set of control laws are optimized and then adjusted based on analytical models bench and wind-tunnel testing.
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Crawley Edward F.
Lazarus Kenneth B.
Ellis Christopher P.
Focarino Margaret A.
Massachusetts Institute of Technology
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