A methodology for design and fatigue analysis of power cables for wave energy converters
Artikel i vetenskaplig tidskrift, 2019

The recent development of subsea power cables for various offshore marine renewable energy technologies has identified the need for new cables that have low structural stiffness properties. This type of cable is referred to as dynamic cable because of its high bending flexibility compared to static cables. The current study presents a cable design model and simulation models that were developed for the design and fatigue analysis of dynamic cables. These models were applied on a subsea dynamic power cable with a design that is suitable for a floating point-absorbing wave energy converter (WEC), where the cable must withstand cyclic loads imposed by the motions of the WEC, the waves and the ocean currents. The cable design model is presented with its detailed design and dimensioning methodology for cables with multiorder helical structures, with respect to desired (target) mechanical properties. The cable design model is verified against a verification study in the literature. A simulation model of a fatigue test rig for accelerated rotational bending is presented. The results from the numerical simulations and the subsequent fatigue analyses are compared against results from experiments using the test rig. The influence of the dynamic effects and mechanical properties on the fatigue life of the cable is discussed. This study contributes to a better understanding of the fatigue failure mechanisms of the cable, and it also highlights the importance of further development of numerical models.

power cables

wave energy converter


cable design

dynamic cables


Artjoms Kuznecovs

Chalmers, Mekanik och maritima vetenskaper, Marin teknik

Jonas Ringsberg

Chalmers, Mekanik och maritima vetenskaper, Marin teknik

Shun-Han Yang

Chalmers, Mekanik och maritima vetenskaper, Marin teknik

Erland Johnson

RISE Research Institutes of Sweden

Andreas Johansson

RISE Research Institutes of Sweden

International Journal of Fatigue

0142-1123 (ISSN)

Vol. 122 61-71

FoU av dynamiska lågspänningskablage mellan boj och flytande hubb i ett marint energisystem

Energimyndigheten (P41240-1), 2015-12-08 -- 2017-08-01.


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