Simple and Robust Direct Drive Wave Power Generation System Using Dielectric Elastomers

Abstract

DEs (dielectric elastomers), a type of electroactive polymer, show considerable promise for harvesting energy from wind, ocean waves, water currents, or even from human motion. Their energy density and efficiency of conversion make for simple, low cost, and robust generators where an electroactive polymer transducer is directly driven by the up-and-down motions of waves. Over the past few years, we have conducted various tests to validate DE wave power generators. In our 2010 test, a DE generator generated electricity even with comparatively small wave heights. Generator performance over a longer period of time (50 minutes) was evaluated in our present test. In the 2010 test, the system was not able to automatically respond to changes in sea level because of its mooring. The present system used a sunken horizontal plate, which enabled it to create the needed reaction forces and respond to sea level changes. This method of mooring generated electric power even in deep water.