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Smart Structures and Systems
  Volume 33, Number 4, April 2024 , pages 281-290

Nonlinear dynamics of an adaptive energy harvester with magnetic interactions and magnetostrictive transduction
Pedro V. Savi and Marcelo A. Savi

    This work investigates the mechanical energy harvesting from smart and adaptive devices using magnetic interactions. The energy harvester is built from an elastic beam connected to an electric circuit by a magnetostrictive material that promotes energy transduction. Besides, magnetic interactions define the system stability characterizing multistable configurations. The adaptiveness is provided by magnets that can change their position with respect to the beam, changing the system configuration. A mathematical model is proposed considering a novel model to describe magnetic interactions based on the single-point magnet dipole method, but employing multiple points to represent the magnetic dipole, which is more effective to match experimental data. The adaptive behavior allows one to alter the system stability and therefore, its dynamical response. A nonlinear dynamics analysis is performed showing the possibilities to enhance energy harvesting capacity from the magnet position change. The strategy is to perform a system dynamical characterization and afterward, alter the energetic barrier according to the environmental energy sources. Results show interesting conditions where energy harvesting capacity is dramatically increased by changing the system characteristics.
Key Words
    adaptive systems; magnetic interaction; mechanical energy harvesting; nonlinear dynamics; smart materials
Universidade Federal do Rio de Janeiro, COPPE – Mechanical Engineering, Center for Nonlinear Mechanics, 21.941.972 – Rio de Janeiro – RJ – Brazil.

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