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Sensitivity analysis of extreme loads acting on a point-absorbing wave energy converter
Aalborg University, Denmark.ORCID iD: 0000-0001-6934-634x
Sigma Energy & Marine AB, Sweden.
RISE Research Institutes of Sweden, Materials and Production, Applied Mechanics.ORCID iD: 0000-0002-6730-0214
Universidade Lusófona do Porto, Portugal.
2022 (English)In: International Marine Energy Journal, ISSN 2631-5548, Vol. 5, no 1, p. 91-101Article in journal (Refereed) Published
Abstract [en]

There are many uncertainties associated with the estimation of extreme loads acting on a wave energy converter (WEC). In this study we perform a sensitivity analysis of extreme loads acting on the Uppsala University (UU) WEC concept. The UU WEC consists of a bottom-mounted linear generator that is connected to a surface buoy with a taut mooring line. The maximum stroke length of the linear generator is enforced by end-stop springs. Initially, a Variation Mode and Effect Analysis (VMEA) was carried out in order to identify the largest input uncertainties. The system was then modelled in the time-domain solver WEC-SIM coupled to the dynamic mooring solver Moody. A sensitivity analysis was made by generating a surrogate model based on polynomial chaos expansions, which rapidly evaluates the maximum loads on the mooring line and the end-stops. The sensitivities are ranked using the Sobol index method. We investigated two sea states using equivalent regular waves (ERW) and irregular wave (IRW) trains. We found that the ERW approach significantly underestimate the maximum loads. Interestingly, the ERW predicted wave height and period as the most important parameters for the maximum mooring tension, whereas the tension in IRW was most sensitive to the drag coefficient of the surface buoy. The end-stop loads were most sensitive to the PTO damping coefficient.

Place, publisher, year, edition, pages
European Wave and Tidal Energy Conference , 2022. Vol. 5, no 1, p. 91-101
Keywords [en]
end-stops, extreme waves, generalized polynomial chaos, mooring dynamics, sensitivity analysis, variation mode effect analysis, wave energy converter, Mooring, Mooring cables, Ocean currents, Tidal power, Time domain analysis, Uncertainty analysis, Wave energy conversion, Effects analysis, End-stop, Generalized polynomials, Mode effects, Mooring dynamic, Polynomial chaos, Variation mode effect analyse, Wave energy converters
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:ri:diva-59873DOI: 10.36688/imej.5.91-101Scopus ID: 2-s2.0-85133142102OAI: oai:DiVA.org:ri-59873DiVA, id: diva2:1685088
Note

Funding details: Energimyndigheten, 47264-1; Funding text 1: This work was supported by the Swedish Energy Agency under project number 47264-1.

Available from: 2022-08-01 Created: 2022-08-01 Last updated: 2023-06-07Bibliographically approved

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Eskilsson, ClaesJohannesson, Pär

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