National Research Council of Canada. NRC Institute for Aerospace Research
13th National Conference Caius Iacob in Fluid Mechanics and Technological Applications, INCAS, September 29-30, 2011, Bucharest, Romania
The objective of this research work is the development of an actuation control concept for a new morphing wing mechanism using smart materials made of Shape Memory Alloy (SMA) for the actuators and surface mounted pressure sensors. These actuators modify the upper wing surface, made of a flexible skin, so that the laminar-to-turbulent transition point moves close to the wing airfoil trailing edge. An intelligent controller was used for the open loop development step of the morphing wing project, and the closed loop of the morphing wing system included, as an internal loop, the controller actuation lines, based on the pressure information received from the sensors and on the transition point position estimation. The strong nonlinearities of the SMA actuators' characteristics and the system requirements led to the choice of a Fuzzy Logic Controller. The input-output mapping of the fuzzy model was designed taking account of the system's error and change in error. After preliminary numerical simulations using to tune the controller, an experimental validation was performed. The experimental validation consisted in experimental bench tests in laboratory conditions in the absence of aerodynamic forces, and in wind tunnel tests; the transition point real time position detection and visualization were realized.
13th National Conference Caius Iacob in Fluid Mechanics and Technological Applications, INCAS [Proceedings].