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Design and Testing of a Mechanical Power Take-off System for Rolling-type Wave Energy Converter

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Abstract

Salter’s Duck can convert wave energy to mechanical energy with high efficiency up to 90%. The limitations and challenges in the usage of Salter’s Duck for energy production include preventing hydraulic system from the risk of leaking hydraulic oil and removing complex huge fixed bracket. This paper presents the conceptual design and an experimental investigation of a mechanical power-take-off (PTO) system for the floating Salter’s Duck. The PTO system is fully installed inside of the Salter’s Duck. It consists of double counter-rotating flywheels converting the bi-directional rotation of the wave energy converter into a stable unidirectional rotation that drives a rotary generator to produce electricity. The bi-to-unidirectional function is achieved through inertial wheels, thus the novel PTO system is free of large supporting structures and hydraulic cylinders. In this paper, a detailed conceptual PTO design is proposed firstly. Further, the influence of the swing amplitude and rotation period of the wave energy converter on the power extraction efficiency is investigated. Then, the influence of the electrical load on the power-extraction efficiency is researched. In the end, the effect of the speed increasing ratio on the mechanical efficiency is examined. The experimental results show that the new type of generator mechanism can produce electricity stably.

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Acknowledgements

The present work is supported by Qingdao National Laboratory for Marine Science and Technology (QNLM2016ORP0402); and the State Key Laboratory of Robotics (No. 2019-O19). The authors would like to thank their support.

Funding

This research was funded by Qingdao National Laboratory for Marine Science and Technology (QNLM2016ORP0402) and the State Key Laboratory of Robotics (No. 2019-O19).

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Authors and Affiliations

  1. School of Naval Architecture Engineering, Dalian University of Technology, Dalian, 116024, Liaoning, China

    Yichen Jiang, Yuhao Peng, Zhi Zong & Lei Sun

  2. State Key Laboratory of Robotics, Shenyang Institute of Automation, Chinese Academy of Sciences, Shenyang, 110016, Liaoning, China

    Yuan Sun

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  1. Yichen Jiang
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  2. Yuhao Peng
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  3. Yuan Sun
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Correspondence to Lei Sun.

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Jiang, Y., Peng, Y., Sun, Y. et al. Design and Testing of a Mechanical Power Take-off System for Rolling-type Wave Energy Converter. Int. J. of Precis. Eng. and Manuf.-Green Tech. 8, 1487–1499 (2021). https://doi.org/10.1007/s40684-020-00253-z

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