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16 August 2001 Active shape airfoil control through composite-piezoceramic actuators
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The transonic aerodynamic field around a wing section is characterized by a large number of peculiarities, which strongly influence the airfoil performance. In particular, a shock wave located on the wing upper surface strongly interacts with the boundary layer, causing a drag increase. Moreover, wave oscillations may give rise to the undesired aeroelastic phenomenon of buffeting. Aerodynamic studies have pointed out that shape airfoil modifications may lead to performance improvements. The aim of the work is to present a procedure to design and realize a tailored and integrated composite actuator made of an aluminium alloy sheet. The geometry of the skin element is modified by the combined action of a uniform pressure load producing static deformations, and tangential piezoelectric ceramic patches bonded through a laminate connection layer, towards one direction, preferably. Glass fiber/epoxy was selected to this target. The design procedure is made of a first part, devoted at the definition of the sheet thickness law (taking into account the ceramics contributions) that assures the deformed shape following the specific aerodynamic requirements, and a second part, applied to optimize the structure-actuators configuration. Analytical and numerical extensions of available models, able to predict the strain actuation on composite elements with variable thickness under different boundary conditions complete the proposed methodology. According to the obtained results and indications, an experimental bump prototype was realized. An experimental campaign is being carried out in order to compare the real behavior of the skin element with the theoretical predictions: static and dynamic bump deflected shape was measured.
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Salvatore Ameduri, Carmine Esposito, and Antonio Concilio "Active shape airfoil control through composite-piezoceramic actuators", Proc. SPIE 4327, Smart Structures and Materials 2001: Smart Structures and Integrated Systems, (16 August 2001);

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