Effects of dynamic axial stiffness of elastic moorings for a wave energy converter
Artikel i vetenskaplig tidskrift, 2022

This work studies the effects of the dynamic axial stiffness of elastic moorings on the dynamic behaviour of a point absorber wave energy converter. Following two mooring analysis procedures, coupled dynamic analysis of a taut-moored WEC with three legs is performed using the FEM program DeepC in three irregular wave conditions. Two synthetic fibre rope materials are investigated, i.e. a normally stiff polyester and a wire-lay 3-strand nylon rope. The results of WEC motions and mooring tensions obtained from a quasi-static stiffness model and the dynamic stiffness model are compared and discussed. The former analysis applies the non-linear stiffness working curves of the ropes in the simulations, while the latter utilizes the dynamic stiffness expression with an iterative process following a practical mooring analysis procedure. For the nylon rope, the influence of the load amplitude on the dynamic stiffness and the WEC response is presented and analysed. It was found that the quasi-static stiffness model tends to underestimate the maximum mooring tensions, leading to 30%–40% lower results compared to the one accounting for the dynamic stiffness effects. For the studied WEC system, the nylon rope shows advantages over polyester, because of the lower mooring tensions and higher WEC motions.


Elastic cables

Dynamic axial stiffness

Wave energy converter


Francesco Depalo

Universidade de Lisboa

Shan Wang

Universidade de Lisboa

Sheng Xu

Universidade de Lisboa

Carlos Guedes Soares

Universidade de Lisboa

Shun-Han Yang

Chalmers, Mekanik och maritima vetenskaper, Marin teknik

Jonas Ringsberg

Chalmers, Mekanik och maritima vetenskaper, Marin teknik

Ocean Engineering

0029-8018 (ISSN)

Vol. 251 111132

ELASTMOOR - Elastiska förankringssystem för vågenergiomvandlare

Energimyndigheten (43995-1), 2017-04-01 -- 2020-05-31.


Hållbar utveckling

Innovation och entreprenörskap


Teknisk mekanik


Textil-, gummi- och polymermaterial

Strömningsmekanik och akustik

Marin teknik





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