Assessing the mechanical stresses of dynamic cables for floating offshore wind applications

Young, David Glenn; Ng, C; Oterkus, Selda; Li, Quan; Johanning, Lars

doi:10.1088/1742-6596/1102/1/012016

Cited by 6 publications

(4 citation statements)

References 4 publications

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“…The paper points out that the tension and bending stress of the cable are important factors affecting the fatigue life of the cable, and the fatigue life of the cable is related to the structure and material of the cable. Young et al [19,20], based on offshore wind power, established a model for dynamic cables to analyze the local stress distribution of the dynamic cable crosssection. They conducted a fatigue damage assessment of the armor wires and insulation materials of dynamic cables through stress time history.…”

Section: Introductionmentioning

confidence: 99%

Simulation Study on Methods for Reducing Dynamic Cable Curvature in Floating Wind Power Platforms

Guo,

Zhao,

et al. 2024

JMSE

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As a key component connecting a floating wind turbine with static sea cables, dynamic cables undergo significant tensile and bending loads caused by hydrostatic pressure, self-weight, waves, and ocean currents during service, which can lead to fatigue failure. Thus, dynamic and fatigue analyses are necessary for the design and operation of dynamic cables. In this study, a fatigue analysis of the three-core four-layer armored dynamic cable used in a semisubmersible floating wind turbine was carried out at a water depth of 25 m. The Miner linear cumulative damage method, based on material S-N curves, was used to predict fatigue life. The results indicate that, at 10 times the safety factor, the dynamic cables meet the design requirement of a 30-year service life in the studied marine environment. The maximal curvature of the dynamic cable always appears at the exit of the bend stiffener, even beyond the allowed point. Adding weights to the section where the cable exits the bend stiffener and adjusting the bend stiffener’s hanging angle can both reduce the curvature at the bend stiffener exit. The scheme of adjusting the bend stiffener’s hanging angle is preferred, for it is easier for simultaneous adjusting and inducing much smaller extra stress in the cable. As the hanging angle increases, the curvature at the bend stiffener exit decreases, while the maximal effective tension and maximal von Mises stress gradually increase. For certain operating conditions, especially with higher waves, it is better to adjust the hanging angle to avoid excessive curvature and, meanwhile, ensure the increase in the stress within a reasonable range.

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Section: Introductionmentioning

confidence: 99%

Simulation Study on Methods for Reducing Dynamic Cable Curvature in Floating Wind Power Platforms

Guo,

Zhao,

et al. 2024

JMSE

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“…From a mechanical point of view, the cable time response is determined at different sea states. In such an analysis, the cable is described by a numerical beam model subjected to hydrodynamic loads and platform motions, see [2][3][4][5][6]. It is therefore important to provide the stiffness characteristics of the beam to this model.…”

Section: Introductionmentioning

confidence: 99%

A computationally efficient finite element model for the analysis of the non-linear bending behaviour of a dynamic submarine power cable

Ménard

Cartraud

2023

Marine Structures

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“…Floating wind turbines use buoyancy modules to suspend dynamic cables in the water column. This inherently increases the mechanical strain the dielectric insulation is subjected to, which is enhanced further by in-service oscillatory movement in the offshore environment [2].…”

Section: Introductionmentioning

confidence: 99%

Development of Techniques for Growing Electrical Trees in 66 kV Cable Cores

Emersic

Chen

et al. 2023

2023 IEEE Electrical Insulation Conference (EIC)

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Dynamic cables used for connection of offshore floating renewable energy sources are subjected to strain from tidal motions and there is little knowledge on the effects of strain on electrical tree growth. Laboratory electrical trees are often grown in small-scale opaque samples for visual imaging of degradation. Here, combined electromechanical test techniques have been developed to examine electrical tree characteristics in full-scale cable core experiments to examine the scalability of laboratory work. Testing methodology has been developed for testing on 66 kV power cable samples energized to grow electrical trees from a needle electrode. Partial discharge (PD) data was recorded, and optical microscopy used for imaging of tree growth post-testing. PD behavior was consistent with studies conducted in laboratory scale needle-plane tests, but the final tree geometries were shorter in length and width than expected in many cases. Followup investigations to review the electrode geometry are presented. It has been shown that only by careful control of conditions can samples be fabricated which will allow combined electrical and mechanical testing in future.

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Assessing the mechanical stresses of dynamic cables for floating offshore wind applications

Cited by 6 publications

References 4 publications

Simulation Study on Methods for Reducing Dynamic Cable Curvature in Floating Wind Power Platforms

Simulation Study on Methods for Reducing Dynamic Cable Curvature in Floating Wind Power Platforms

A computationally efficient finite element model for the analysis of the non-linear bending behaviour of a dynamic submarine power cable

Development of Techniques for Growing Electrical Trees in 66 kV Cable Cores

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