APPLICATION OF SHUNTED PIEZOELECTRIC MATERIALS IN AEROELASTICITY
Leandro de Souza Leão1; André Garcia Cunha Filho1; Antônio Marcos Gonçalves de Lima1; Maurício Vicente Donadon2
1 Universidade Federal de Uberlândia; 2 Instituto Tecnológico de Aeronáutica
doi:10.20906/CPS/COB-2015-1212
Resumo
This paper presents a numerical study on the influence of the shunted piezoelectric material parameters in the flutter velocity of a typical section under quasi-static steady and unsteady flows. Flutter on typical sections is a kind of self-excited oscillation which can occur due to the interaction with the airflow. In the flutter point, when the critical dynamic pressure is reached, the vibrations of the typical section become unstable and increase fast and significantly in time. As a result, it can lead the structure to catastrophic failure. Thus, it becomes important to investigate the possibility of reducing the effects of flutter in order to increase the reliability of composite structures during service. In this work, the aero-electromechanical dynamic model formulation is based on the Hamilton principle. The unsteady aerodynamic forces are calculated based on the linearized thin-airfoil theory. The passive element responsible for the energy dissipation is a multimodal resonant shunt circuit in series topology, attached to a piezoelectric patch. An iterative solution algorithm is proposed to solve the resultant nonlinear eigenvalue problem and find the optimum shunt circuit parameters. The preliminary results indicate that the utter velocity is significantly affected by the geometric and electromechanical parameters of the piezoelectric material.
Palavras-chave: aeroelasticity; flutter; piezoelectric materials; multimodal shunt circuit; passive control