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Design and optimization of a wave energy converter for drifting sensor platforms in realistic ocean waves

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  • Harms, Julius
  • Hollm, Marten
  • Dostal, Leo
  • Kern, Thorsten A.
  • Seifried, Robert

Abstract

One of the biggest challenges in converting wave energy is to enable the use of low frequency waves, since the highest waves in typical sea states have low frequencies, as can be seen from the corresponding wave spectra, such as the Pierson–Moskowitz or JONSWAP spectra. In this paper, we show that this challenge is indeed achievable for the operation of small autonomous drifting sensor platforms. We present the design and optimization of a compact wave energy converter that freely floats in random sea waves. An optimization of the dynamical behavior as well as the electromagnetic power take-off is conducted based on simulations and experiments. The platform has compact dimensions of 50 cm draft and 50 cm diameter, which leads to special requirements for size and appearance. To meet these requirements, a two-body self-reacting point absorber is designed and a flux switching permanent magnet linear machine is developed for the power take-off. The developed system is validated by experiments in a wave flume and the linear generator is analyzed on a test bench. A coupled model is used to simulate and optimize the corresponding mechanical system, which leads to an increased output power from below 10 mW for the simulated initial setup to a power output of more than 100 mW in the simulation. Simulations and experiments are performed for regular and random waves in order to provide realistic approximations of the total output power.

Suggested Citation

  • Harms, Julius & Hollm, Marten & Dostal, Leo & Kern, Thorsten A. & Seifried, Robert, 2022. "Design and optimization of a wave energy converter for drifting sensor platforms in realistic ocean waves," Applied Energy, Elsevier, vol. 321(C).
    • Handle: RePEc:eee:appene:v:321:y:2022:i:c:s0306261922006572
    DOI: 10.1016/j.apenergy.2022.119303
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    References listed on IDEAS

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    1. Joe, Hangil & Roh, Hyunwoo & Cho, Hyeonwoo & Yu, Son-Cheol, 2017. "Development of a flap-type mooring-less wave energy harvesting system for sensor buoy," Energy, Elsevier, vol. 133(C), pages 851-863.
    2. Liang, Changwei & Zuo, Lei, 2017. "On the dynamics and design of a two-body wave energy converter," Renewable Energy, Elsevier, vol. 101(C), pages 265-274.
    3. Shi, Ge & Tong, Dike & Xia, Yinshui & Jia, Shengyao & Chang, Jian & Li, Qing & Wang, Xiudeng & Xia, Huakang & Ye, Yidie, 2022. "A piezoelectric vibration energy harvester for multi-directional and ultra-low frequency waves with magnetic coupling driven by rotating balls," Applied Energy, Elsevier, vol. 310(C).
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    1. Zhang, Tingsheng & Kong, Lingji & Zhu, Zhongyin & Wu, Xiaoping & Li, Hai & Zhang, Zutao & Yan, Jinyue, 2024. "An electromagnetic vibration energy harvesting system based on series coupling input mechanism for freight railroads," Applied Energy, Elsevier, vol. 353(PA).

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