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Sensitivity Analysis of Extreme Loads Actingon a Point-Absorbing Wave Energy Converter
RISE Research Institutes of Sweden, Säkerhet och transport, Säkerhetsforskning. Aalborg University, Denmark.ORCID-id: 0000-0001-6934-634x
Sigma Energy & Marine AB, Sweden.
RISE Research Institutes of Sweden, Material och produktion, Tillämpad mekanik.ORCID-id: 0000-0002-6730-0214
Universidade Lus´ofona do Porto, Portugal.
2021 (Engelska)Ingår i: Proceedings of the 14th European Wave and Tidal Energy Conference 5-9th Sept 2021, Plymouth, UK, 2021, s. 1992-1-1992-10Konferensbidrag, Publicerat paper (Refereegranskat)
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 bottommounted linear generator which is connected to a surface buoy with a taut mooring line. The maximum stroke length of the linear generator is enforced by end-stops. 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 WECSIM 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 endstops. The sensitivities are ranked using the Sobol index method. We investigated two sea states using equivalent regular waves (ERW) and irregular wave (IR) 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, while the tension in IR waves was most sensitive to the drag coefficient of the surface buoy. The end-stop loads were most sensitive to the PTO damping coefficient.

Ort, förlag, år, upplaga, sidor
2021. s. 1992-1-1992-10
Nyckelord [en]
Extreme waves, wave energy converter, mooring dynamics, sensitivity analysis, generalized polynomial chaos, variation mode effect analysis
Nationell ämneskategori
Marin teknik
Identifikatorer
URN: urn:nbn:se:ri:diva-56724OAI: oai:DiVA.org:ri-56724DiVA, id: diva2:1598509
Konferens
14th European Wave and Tidal Energy Conference 5-9th Sept 2021, Plymouth, UK
Anmärkning

Thiswork was supported by the Swedish Energy Agency under projectnumber 47264-1.

Tillgänglig från: 2021-09-29 Skapad: 2021-09-29 Senast uppdaterad: 2023-06-07Bibliografiskt granskad

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Eskilsson, ClaesJohannesson, Pär

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