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An optimal arrangement of mooring lines for the three-tether submerged point-absorbing wave energy converter

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  • Sergiienko, N.Y.
  • Cazzolato, B.S.
  • Ding, B.
  • Arjomandi, M.

Abstract

Point-absorbing wave energy converters (WECs) with a single-tether mooring are capable of extracting power from heave motion, but they do not utilise the full energy harvesting potential. One of the possible ways to increase the total power absorption is to add another controllable degree of freedom. These can be achieved by using a so-called ‘tripod’ configuration when the body is tied to three tethers attached to the power take-off systems at the sea floor. This paper investigates the optimal inclination of tethers considering two different approaches: a purely kinematic analysis, not taking into account the shape of the buoy and a dynamic analysis of spherical and cylindrical WECs, using a linear frequency-domain method. The results show that for a submerged sphere and for a submerged vertical cylinder with an aspect ratio of one, tethers should be orthogonal to each other, forming edges of the cuboidal vertex. Such a configuration of tethers provides for uniform performance of the WEC in all directions of motion. However, for the cylinders with an aspect ratio other than one, an optimal angle between the tethers depends greatly on the ratio between the cylinder height and diameter.

Suggested Citation

  • Sergiienko, N.Y. & Cazzolato, B.S. & Ding, B. & Arjomandi, M., 2016. "An optimal arrangement of mooring lines for the three-tether submerged point-absorbing wave energy converter," Renewable Energy, Elsevier, vol. 93(C), pages 27-37.
    • Handle: RePEc:eee:renene:v:93:y:2016:i:c:p:27-37
    DOI: 10.1016/j.renene.2016.02.048
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    References listed on IDEAS

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    1. Bachynski, Erin E. & Young, Yin Lu & Yeung, Ronald W., 2012. "Analysis and optimization of a tethered wave energy converter in irregular waves," Renewable Energy, Elsevier, vol. 48(C), pages 133-145.
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    Cited by:

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    2. Sergiienko, N.Y. & Cazzolato, B.S. & Ding, B. & Hardy, P. & Arjomandi, M., 2017. "Performance comparison of the floating and fully submerged quasi-point absorber wave energy converters," Renewable Energy, Elsevier, vol. 108(C), pages 425-437.
    3. Erfan Amini & Danial Golbaz & Fereidoun Amini & Meysam Majidi Nezhad & Mehdi Neshat & Davide Astiaso Garcia, 2020. "A Parametric Study of Wave Energy Converter Layouts in Real Wave Models," Energies, MDPI, vol. 13(22), pages 1-23, November.
    4. Meng, Fantai & Ding, Boyin & Cazzolato, Benjamin & Arjomandi, Maziar, 2019. "Modal analysis of a submerged spherical point absorber with asymmetric mass distribution," Renewable Energy, Elsevier, vol. 130(C), pages 223-237.
    5. Mehdi Neshat & Nataliia Y. Sergiienko & Erfan Amini & Meysam Majidi Nezhad & Davide Astiaso Garcia & Bradley Alexander & Markus Wagner, 2020. "A New Bi-Level Optimisation Framework for Optimising a Multi-Mode Wave Energy Converter Design: A Case Study for the Marettimo Island, Mediterranean Sea," Energies, MDPI, vol. 13(20), pages 1-23, October.
    6. Zhang, Yongxing & Huang, Zhicong & Zou, Bowei & Bian, Jing, 2023. "Conceptual design and analysis for a novel parallel configuration-type wave energy converter," Renewable Energy, Elsevier, vol. 208(C), pages 627-644.
    7. Galván-Pozos, D.E. & Ocampo-Torres, F.J., 2020. "Dynamic analysis of a six-degree of freedom wave energy converter based on the concept of the Stewart-Gough platform," Renewable Energy, Elsevier, vol. 146(C), pages 1051-1061.
    8. Neshat, Mehdi & Mirjalili, Seyedali & Sergiienko, Nataliia Y. & Esmaeilzadeh, Soheil & Amini, Erfan & Heydari, Azim & Garcia, Davide Astiaso, 2022. "Layout optimisation of offshore wave energy converters using a novel multi-swarm cooperative algorithm with backtracking strategy: A case study from coasts of Australia," Energy, Elsevier, vol. 239(PE).

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