Research Papers: Ocean Renewable Energy

Single-Point Power-Mooring Composite Cables for Wave Energy Converters

[+] Author and Article Information
Andrew Miller

Mechanical, Industrial and
Manufacturing Engineering,
Oregon State University,
Corvallis, OR 97331
e-mail: millandr@onid.oregonstate.edu

Roberto Albertani

Associate Professor
Mechanical, Industrial and
Manufacturing Engineering,
Oregon State University,
Corvallis, OR 97331
e-mail: Roberto.Albertani@oregonstate.edu

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received November 4, 2014; final manuscript received June 16, 2015; published online August 4, 2015. Assoc. Editor: Myung Hyun Kim.

J. Offshore Mech. Arct. Eng 137(5), 051903 (Aug 04, 2015) (8 pages) Paper No: OMAE-14-1136; doi: 10.1115/1.4030900 History: Received November 04, 2014

This paper presents the analysis and design of single-point power-mooring cables applied to wave energy converters (WECs). A mooring cable design process is suggested, and effects of cable cross-sectional layout, material selection, and conductor design on cable properties are investigated. The study focuses on cable design and structural material for a long service life. Six designs and four structural materials were studied for a total of 18 different configurations. The materials used for the study included Vectran HS, Kevlar 49, carbon fibers in a vinyl ester matrix, and MP35N alloy. Cable design had minimal impact on cable properties. Material used and component helical angle exhibited significant impact on cable mechanical properties. Synthetic fiber designs exhibited more desirable mechanical properties and fatigue performance than both carbon fibers in a vinyl ester matrix and MP35N alloy. Wave device heave and cable tension were not affected by cable material.

Copyright © 2015 by ASME
Topics: Cables , Design , Stress , Mooring
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Fig. 2

Ocean Sentinel in dry dock

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Fig. 3

Tension in mooring cable for design 1 using Vectran (solid line), Kevlar (diamonds), CFRP (squares), MP35N (circles), and the analytical case (dashed)

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Fig. 4

Cable designs considered in analysis: (a) CSM, (b) CSM with protective jacket, (c) CSM–CCC, (d) CCC with braided structural member, (e) CCC with helically wrapped structural member, and (f) CCC with helically wrapped structural member and modified electrical package.

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Fig. 6

Fatigue plots for Vectran (solid line), Kevlar (diamonds), CFRP (squares), and MP35N (circles)




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