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On End-Stops and Snap Loads for Taut-Moored Wave Energy Converters
Sigma Marine and Energy, Sweden.
RISE Research Institutes of Sweden, Safety and Transport, Safety Research. Aalborg University, Denmark.ORCID iD: 0000-0001-6934-634x
2021 (English)In: Proceedings of the 14th European Wave and Tidal Energy Conference 5-9th Sept 2021, Plymouth, UK, 2021, p. 1984-1-1984-10Conference paper, Published paper (Refereed)
Abstract [en]

The power output from many wave energy converters (WECs) is limited by a finite stroke length in the power take-off (PTO) mechanism. As the PTO approaches its maximum stroke length, an end-stop system needs to be engaged to avoid damage to the machinery. Still the on-set of the end-stop is a nonlinear trigger force, a stiff point in the system. In this respect it is similar to how snap loads in the mooring cables affect the system after a period of cable slack. This paper presents a detailed study into the dynamics of end-stop events and snap loads for a WEC. The WEC is a bottom-mounted linear generator connected to a surface buoy via a steel wire. By comparing a linear spring model with three dynamic mooring line models we conclude that large differences are observed in the low-tension and slack regions of the cable during moderate wave loads, while minor differences are seen in the estimated peak tension. By further varying end-stop parameters we observe that the peak tension in the line changes mildly with the axial stiffness for moderate wave heights. The peak tension is surprisingly unaffected by the introduction of a critical damping level to the end-stop system, despite the significant increase in end-stop force which causes the translator to come to a sudden stop. We discuss how the connection between maximum line force and end-stop parameters is highly dependent on the buoy position in the wave at the instant of end-stop onset.

Place, publisher, year, edition, pages
2021. p. 1984-1-1984-10
Keywords [en]
Mooring cables, end-stop, snap load, floating wave energy converters.
National Category
Marine Engineering
Identifiers
URN: urn:nbn:se:ri:diva-56722OAI: oai:DiVA.org:ri-56722DiVA, id: diva2:1598453
Conference
14th European Wave and Tidal Energy Conference 5-9th Sept 2021, Plymouth, UK
Note

This work was supported by the Swedish Energy Agencyunder project numbers 47264-1 and 50196-1.J. Palm is with Sigma Marine and Energy,

Available from: 2021-09-29 Created: 2021-09-29 Last updated: 2023-05-16Bibliographically approved

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