Multimodal Energy Harvesting Efficiency Enhancement via Linear Matrix Inequalities Control Driven

There are several solutions to enhance energy harvesting efficiency and is highlighted as the most promised state of the art research the active control driven for increase mechanical energy transformation from vibration to electric energy. The control driven uses the impulse to curt circuit the piezoelectric film and takes advantage of piezoelectric indirect effect. The controller changes the relative stiffness, damping and mass of the studied system and consequently changes the system natural frequency. It is imposed velocity and acceleration to the system to combine the exogenous excitation to system parameters and resulting in maximum mechanical energy transfer. A numeric simulation was lead using a Linear Matrix Inequalities controller applied to a multimodal energy harvester. As main result the controller increased the energy harvester efficiency up to 4 times.