Abstract
Ocean wave is a potential renewable energy source with stability and abundance. However, its high initial investment requires high energy harvesting efficiency, limiting its application. In this research, the ocean wave is directly amplified by adopting the structure of the acoustic metamaterial. SHOWPAM—A System of High-efficiency Ocean Wave Power with Acoustic Metamaterial – is designed to achieve this amplification. The mathematical analogy between acoustic wave and water surface wave is found. Also, an effective physical property of the solid obstacle, such as a wall, as a medium of water surface wave is investigated. Coiling-up-space metamaterial structure is simplified to a six-variable system and optimized for maximum water surface wave amplitude using COMSOL Multiphysics. Then, SHOWPAM is constructed based on the simulation result, consisting of a central cavity, energy harvester, and optimized metamaterial on both sides of the cavity. A control model was identical to SHOWPAM but didn’t have metamaterial. Both models are tested in the wave generating pool, and power generation of each model was measured. SHOWPAM showed 225% average power compared to the control model, proving the capability of metamaterial structure to enhance ocean wave power.
Published Version
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