Development of mechanical coupling for piezoelectric energy harvester adapted to low-frequency vibration

Piezoelectric cantilever is widely use as energy harvester from vibration source. Common of the problem is how to tune the natural frequency of piezoelectric in order to generate maximum ouput power. This work was proposed alternative scheme of mechanical coupling for tune the vibration input into natural frequency of piezoelectric, that consist of cantilever beam and permanent magnet. On the experiment, correlation with the lenght of cantilever beam and the output power are evaluated. Based on experiment, the maximum ouput power could be reached when the length of cantilever beam is twice of the length of the piezoelectric dimension.