AN INTERACTIVE SYNTHESIS APPROACH FOR ROBUST ACTIVE FLUTTER SUPPRESSION CONTROL LAW DESIGN
Abstract
Computer-aided, graphical, frequency-domain synthesis approach is employed in the control law design process for robust active flutter suppression (AFS). The relatively high dynamic order of such problems are dealt with effectively with a computer-aided approach, while interactive computer graphics allows frequency-domain graphical techniques to be utilized. Key design information is displayed for variations in flight conditions such that simple control laws are obtained that are robust over various flight conditions under consideration. Through visualization of the pole and zero migration with dynamic pressure, control synthesis, evaluation of effects of unsteady aerodynamics, and model reduction can be performed almost by inspection. Several candidate control laws are analytically shown to compare very favorably to several others taken from the literature. For the AFS problem, it is found that the aeroelastic mode dipole orientations significantly impact the easiness in the control synthesis process and the possibly achievable overall system performance and controller robustness. The selection of sensor location plays an important role in the determination of advantageous dipole orientations. Inappropriate choice of dipole configurations or right-half-plane zeros makes the control synthesis task difficult, although may not be impossible, right from the beginning. Specific examples were studied and results compared to exploit such influence of sensor location selection on system performance and controller robustness.
Degree
Ph.D.
Subject Area
Aerospace materials
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