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A Contactless Coupled Pendulum and Piezoelectric Wave Energy Harvester: Model and Experiment

Author

Listed:
  • Wuwei Feng

    (School of Marine Engineering Equipment, Zhejiang Ocean University, Zhoushan 316004, China
    The Lyell Centre for Earth and Marine Science and Technology, Institute for Infrastructure and Environment, Heriot-Watt University, Edinburgh EH14 4AS, UK)

  • Hongya Chen

    (School of Marine Engineering Equipment, Zhejiang Ocean University, Zhoushan 316004, China)

  • Qingping Zou

    (The Lyell Centre for Earth and Marine Science and Technology, Institute for Infrastructure and Environment, Heriot-Watt University, Edinburgh EH14 4AS, UK)

  • Di Wang

    (College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, China)

  • Xiang Luo

    (School of Marine Engineering Equipment, Zhejiang Ocean University, Zhoushan 316004, China)

  • Cathal Cummins

    (Maxwell Institute for Mathematical Sciences, Department of Mathematics, Heriot-Watt University, Edinburgh EH14 4AS, UK
    Institute for Sustainable Built Environment, School of Energy, Geoscience, Infrastructure and Society, Heriot-Watt University, Edinburgh EH14 4AS, UK)

  • Chuanqiang Zhang

    (School of Marine Engineering Equipment, Zhejiang Ocean University, Zhoushan 316004, China)

  • Shujie Yang

    (School of Marine Engineering Equipment, Zhejiang Ocean University, Zhoushan 316004, China)

  • Yuxiang Su

    (School of Marine Engineering Equipment, Zhejiang Ocean University, Zhoushan 316004, China)

Abstract

Wireless monitoring systems for the marine environment are important for rapidly growing subsea developments. The power supply of wireless sensor nodes within the monitoring systems, however, is a major challenge. This study proposes a novel piezoelectric wave energy converter (pWEC) device to power the wireless sensing nodes. Unlike previous studies, the proposed device utilizes contactless pWEC technology in which a spring pendulum provides a two-stage frequency amplification of 3.8 times for low-frequency wave environments. The pWEC device consists of a floating body, inner pendulum, spring pendulum, magnets and piezoelectric sheets. In order to harvest the energy from relatively low frequency ocean waves, the pWEC device is designed to have an enhanced energy-capturing frequency. The effects of internal pendulum mass, spring pendulum weight, pendulum length and spring stiffness on wave energy absorption are investigated using theoretical and numerical analysis combined with laboratory experiments. The slider that drives the motion of the piezoelectric sheet vibrates at up to 3.8 times the wave frequency. To test the piezoelectric generators in the laboratory environment, a mechanical structure is set up to simulate the motion of the external floating body and the internal wave energy converter under the action of waves. When the four piezoelectric plates are arranged horizontally, the average output power per plate is increased by 2.4 times, and a single piezoelectric plate can generate an average of 10 mW of power. The proposed piezoelectric wave energy converter device has the potential to provide long-term energy supply for small ocean monitoring platforms at remote locations with reasonable wave energy resources.

Suggested Citation

  • Wuwei Feng & Hongya Chen & Qingping Zou & Di Wang & Xiang Luo & Cathal Cummins & Chuanqiang Zhang & Shujie Yang & Yuxiang Su, 2024. "A Contactless Coupled Pendulum and Piezoelectric Wave Energy Harvester: Model and Experiment," Energies, MDPI, vol. 17(4), pages 1-20, February.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:4:p:876-:d:1338662
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    References listed on IDEAS

    as
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    4. Wu, Yipeng & Qiu, Jinhao & Zhou, Shengpeng & Ji, Hongli & Chen, Yang & Li, Sen, 2018. "A piezoelectric spring pendulum oscillator used for multi-directional and ultra-low frequency vibration energy harvesting," Applied Energy, Elsevier, vol. 231(C), pages 600-614.
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