Experimental and numerical studies on dynamic stress and curvature in steel tube umbilicals

Dai, Tianjiao; Sævik, Svein; Ye, Naiquan

doi:10.1016/j.marstruc.2020.102724

Cited by 15 publications

(4 citation statements)

References 9 publications

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“…UFLEX provides modeling capabilities for complex cross-section geometries, contact and friction stresses, nonlinear relationships between curvature and bending moment, crosssection geometry ovalization, and nonlinear material models. This software has been validated by other finite element software as well as experiments described by Saevik and Bruaseth [27], Dai [28], Saevik and Gjøsteen [29], and SINTEF [30].…”

Section: Numerical Toolsmentioning

confidence: 99%

Fatigue Analysis of Inter-Array Power Cables between Two Floating Offshore Wind Turbines Including a Simplified Method to Estimate Stress Factors

Beier,

Schnepf,

Van Steel

et al. 2023

JMSE

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The use of floating offshore wind farms for electrical energy supply is expected to rise significantly over the coming years. Suspended inter-array power cables are a new design to connect floating offshore wind turbines (FOWTs) with shorter cable lengths than conventional setups. The present study investigates the fatigue life of a suspended power cable with attached buoys connecting two spar-type FOWTs. Typical environmental conditions for the North Sea are applied. The nonlinear bending behavior of the power cable is considered in the analysis. Fatigue assessment is performed using the numerical software OrcaFlex based on stress factors obtained from cross-section analysis. An effective method for obtaining the stress factors is proposed for early engineering design stages and compared with the finite element software UFLEX simulation results. The simplified method delivers similar results for axial tension loads and conservative results for bending loads compared with results obtained from the finite element software. Stress components resulting from curvature variation are identified as the main contributors to fatigue damage. The most critical locations along the power cable for fatigue life are close to the hang-off points.

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Section: Numerical Toolsmentioning

confidence: 99%

Fatigue Analysis of Inter-Array Power Cables between Two Floating Offshore Wind Turbines Including a Simplified Method to Estimate Stress Factors

Beier,

Schnepf,

Van Steel

et al. 2023

JMSE

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“…Water density (kg/m 3 ) 1025 Water depth (meters) 320 Displaced volume of water when the platform is in its undisplaced position (m 3 Table A3. Mooring line properties of the model [25].…”

Section: Description Unitmentioning

confidence: 99%

“…One of the main design issues for power cables in marine applications is the fatigue strength; fatigue assessment studies have demonstrated that accurate analysis of the complex dynamic behavior induced by the offshore environment must be carried out for fatigue assessment purposes. Dai et al (2020) [3] presented experimental and numerical studies on dynamic stress and curvature in steel tube umbilicals, and the results show that curvature, governs the fatigue problem, even when it is small. Yang et al (2018) [4] presented a parametric study of the dynamic motions and mechanical characteristics of power cables for a wave energy conversion (WEC) system.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Life Assessment for Power Cables in Floating Offshore Wind Turbines

et al. 2020

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In this paper, a procedure is proposed to determine the fatigue life of the electrical cable connected to a 5 MW floating offshore wind turbine, supported by a spar-buoy at a water depth of 320 m, by using a numerical approach that takes into account site-specific wave and wind characteristics. The effect of the intensity and the simultaneous actions of waves and wind are investigated and the outcomes for specific cable configurations are shown. Finally, the fatigue life of the cable is evaluated. All analyses have been carried out using the Ansys AQWA computational code, which is a commercial code for the numerical investigation of the dynamic response of floating and fixed marine structures under the combined action of wind, waves and current. Furthermore, this paper applies the FAST NREL numerical code for comparison with the ANSYS AQWA results.

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Section: Introductionmentioning

confidence: 99%

Assessment and Nonlinear Modeling of Wave, Tidal and Wind Energy Converters and Turbines

Karimirad¹,

Collu²

2020

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Dr. Karimirad has been researching marine structures and offshore technology for more than 13 years. His knowledge covers salient aspects of offshore mechanics, hydrodynamics, and structural engineering, and he has more than 80 scientific publications (Citations 1522, h-index 22). He has been part of NOWITECH (Norwegian Research Center for Offshore Wind Technology) for eight years.While working at MARINTEK/SINTEF (Norway), he has been the key researcher and research manager in collaborative projects such as H2020 LIFES50+, EU FP7 DTOcean, and EU IPRWind.Recently, he was the investigator on Floating Solar Energy and a contributor to the decarbonization project (granted by Invest Northern Ireland).

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Experimental and numerical studies on dynamic stress and curvature in steel tube umbilicals

Cited by 15 publications

References 9 publications

Fatigue Analysis of Inter-Array Power Cables between Two Floating Offshore Wind Turbines Including a Simplified Method to Estimate Stress Factors

Fatigue Analysis of Inter-Array Power Cables between Two Floating Offshore Wind Turbines Including a Simplified Method to Estimate Stress Factors

Fatigue Life Assessment for Power Cables in Floating Offshore Wind Turbines

Assessment and Nonlinear Modeling of Wave, Tidal and Wind Energy Converters and Turbines

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