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Effects of Mooring Compliancy on the Mooring Forces, Power Production, and Dynamics of a Floating Wave Activated Body Energy Converter

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  • Luca Martinelli

    (ICEA Department, University of Padova, via Ognissanti 39, 35129 Padova, Italy)

  • Barbara Zanuttigh

    (DICAM, University of Bologna, viale Risorgimento 2, 40136 Bologna, Italy)

Abstract

The paper aims at investigating the interactions between a floating wave energy device (WEC) and its mooring system under a variety of wave conditions (regular and irregular, perpendicular and oblique, ordinary and extreme). The analyzed WEC is the DEXA, a wave activated body point absorber, of the type that performs better when aligned to the incident wave direction. Two typologies of mooring systems were studied: for limited depths, the spread system, with a disposition of the lines that do not constrain the yaw movements; for large depths, the catenary anchor leg mooring (CALM) system. The spread system was experimentally investigated, including a realistic power take-off system, to capture non-linear behaviors and assess device motions, power production, and forces on mooring lines. The CALM system was numerically simulated, as mooring modelling is more reliable in deep waters and allows testing of a number of different configurations, by changing the number of the mooring lines and the mooring layout. The experiments showed that a reduction of the mooring compliancy increases the power production. The numerical simulations showed that a redundancy on the number of chains allows a better distribution of the loads, with advantages on reliability and costs.

Suggested Citation

  • Luca Martinelli & Barbara Zanuttigh, 2018. "Effects of Mooring Compliancy on the Mooring Forces, Power Production, and Dynamics of a Floating Wave Activated Body Energy Converter," Energies, MDPI, vol. 11(12), pages 1-24, December.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:12:p:3535-:d:191676
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    References listed on IDEAS

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    1. Jonas Bjerg Thomsen & Francesco Ferri & Jens Peter Kofoed & Kevin Black, 2018. "Cost Optimization of Mooring Solutions for Large Floating Wave Energy Converters," Energies, MDPI, vol. 11(1), pages 1-23, January.
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    10. Barbara Zanuttigh & Elisa Angelelli & Giorgio Bellotti & Alessandro Romano & Yukiko Krontira & Dimitris Troianos & Roberto Suffredini & Giulia Franceschi & Matteo Cantù & Laura Airoldi & Fabio Zagonar, 2015. "Boosting Blue Growth in a Mild Sea: Analysis of the Synergies Produced by a Multi-Purpose Offshore Installation in the Northern Adriatic, Italy," Sustainability, MDPI, vol. 7(6), pages 1-50, May.
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    Cited by:

    1. Seongho Ahn & Kevin A. Haas & Vincent S. Neary, 2020. "Dominant Wave Energy Systems and Conditional Wave Resource Characterization for Coastal Waters of the United States," Energies, MDPI, vol. 13(12), pages 1-26, June.
    2. Dallavalle, Elisa & Cipolletta, Mariasole & Casson Moreno, Valeria & Cozzani, Valerio & Zanuttigh, Barbara, 2021. "Towards green transition of touristic islands through hybrid renewable energy systems. A case study in Tenerife, Canary Islands," Renewable Energy, Elsevier, vol. 174(C), pages 426-443.
    3. Ahn, Seongho & Haas, Kevin A. & Neary, Vincent S., 2020. "Wave energy resource characterization and assessment for coastal waters of the United States," Applied Energy, Elsevier, vol. 267(C).
    4. Luca Martinelli & Matteo Volpato & Chiara Favaretto & Piero Ruol, 2019. "Hydraulic Experiments on a Small-Scale Wave Energy Converter with an Unconventional Dummy Pto," Energies, MDPI, vol. 12(7), pages 1-12, March.

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