Adaptive piezoelectric metacomposite: a new integrated technology to control vibroacoustic power flow

International audienceResearch activities in smart materials and structures are very important today and represent a significant potential for technological innovation in mechanics and electronics. In order to realize smart vibroacoustic design, new methodologies are now available which allow active transducers and their driving electronics to be directly integrated into otherwise passive structures. The main research challenge today deals with the development of new multi-functional structures integrating electro-mechanical systems in order to optimize their intrinsic mechanical behavior to achieve desired vibroacoustic goals. The new desired functionalities can also be implemented at the material level to create new adapative metacomposite. This paper presents the design and characterization of a specific metacomposite made of a periodically distributed set of shunted piezoelectric material cells to control vibroacoustic power flow into 2D wave guides. The main purpose of this work is to present the usesd numerical approach able to compute the multi-modal wave dispersions curves into the whole first Brillouin zone for damped 2D electromechanical systems. By using specific indicators, we optimize the piezoelectric shunting electrical impedance for controlling energy diffusion into the proposed adaptive distributed set of cells. Particular implantation's problems are also addressed and optimized for taking into consideration electromechanical lack of robustness due to electronic coupling behavior