Modelagem matemática de sistemas piezoelétricos baseado em modelos de folhas artificiais

Abstract

The term energy harvesting describes a process that aims to collect the energy available in the environment, which may be available from different natural sources, such as solar radiation, thermal, hydraulic, wind energy, mechanical loads, vibrations, and other less usual ones. In general, energy harvesting systems are implemented with the function of powering devices and electronic circuits with low energy consumption. This study evaluate the behavior of a piezoelectric system, whose collector simulates a natural tree leaf. The system's external energy source is wind energy, which makes the collector oscillate, and this displacement causes a reaction in the piezoelectric system, generating energy. For the understanding of a piezoelectric system and its peculiarities, a bibliographical review was made about periodic movements in order to formulate a mathematical model later that is able to explain proposed experimental data. The graphical outputs of the piezoelectric system show the displacement and potential difference as a function of time and as a function of velocity, and they are in accordance with other similar studies found in the literature, however, the values generated through the mathematical model are not compatible with the experimental part presented, making adjustments necessary for the mathematical model to accurately explain the results obtained experimentally.