Colheita de energia de vibração a partir de sistemas inteligentes e adaptativos utilizando interações magnéticas

Abstract

This work investigates the vibration-based energy harvesting from smart and adaptive devices with magnetic interaction. The conversion of the mechanical vibration energy is promoted by smart materials, specifically a magnetostrictive material. It is exploited nonlinearities induced by magnetic interactions that confer multistability characteristics of the system. Magnetic interactions are described by a novel model that represents the magnets by multiple points, improving the usual description of the method of the equivalent magnetic dipole point. Based on the modeling of the magnetic interaction, it is presented a dynamical system associated with an adaptive energy harvesting device composed by a cantilever beam with basis excitation that represents the energy source of external vibration. The system has a magnet at the beam end that interacts with other three magnets. The system adaptability is associated with a degree of freedom of one of the three magnets, modifying system multistability aspects. A dynamical investigation shows the feasibility to enhance energy harvesting capacity changing the magnet position. Results show that the nonlinear dynamics perspective is capable to define the best characteristics of the device according to external conditions