Modelling and testing of a wave energy converter based on dielectric elastomer generators

Area of Science:

• Marine Engineering
• Renewable Energy Systems
• Electro-mechanical Systems

Background:

• Wave energy converters (WECs) are crucial for renewable energy, but efficient power take-off (PTO) systems remain a challenge.
• Dielectric elastomer generators (DEGs) offer a novel electrostatic approach for WEC PTO systems.

Purpose of the Study:

• To introduce the analysis and design of a WEC system incorporating a novel dielectric elastomer generator (DEG) as its power take-off system.
• To develop and validate a predictive model combining nonlinear hydrodynamics and electro-hyperelasticity for DEG-based WECs.
• To evaluate the performance of a small-scale DEG-based WEC prototype under realistic wave conditions.

Main Methods:

• Development of a hybrid model integrating nonlinear potential-flow hydrodynamics with electro-hyperelasticity.
• Design and fabrication of a small-scale WEC prototype with a DEG, utilizing novel scaling rules for Froude similarity.
• Experimental validation through wave-tank tests in regular and irregular waves with a prediction-free control strategy.

Main Results:

• The validated model accurately predicts the dynamic response of the DEG-based WEC.
• The small-scale prototype achieved remarkable performance, with peak power outputs up to 3.8 W (scaled to hundreds of kilowatts).
• Successful demonstration of DEG-based WEC feasibility for large-scale electrical energy production.

Conclusions:

• The developed modeling approach effectively supports the design and evaluation of DEG-based WECs.
• Experimental results confirm the viability of DEG technology for efficient and scalable wave energy conversion.
• This research paves the way for advanced WEC designs focused on significant electrical power generation.