Fatigue Life Assessment for Power Cables in Floating Offshore Wind Turbines

Sobhaniasl, Mohsen; Petrini, Francesco; Karimirad, Madjid; Bontempi, Franco

doi:10.3390/en13123096

Cited by 20 publications

(8 citation statements)

References 21 publications

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“…Fretting and wear damages to the conductors' wires, caused primarily by cyclic bending loads, have been recognized as a challenge for marine cables with metallic armor [18][19][20][21][22][23]. The current study showed that this is also challenging for marine cables without metallic armor.…”

Section: Discussionmentioning

confidence: 65%

“…They also provide mechanical properties that reduce the risk of structural integrity degradation if appropriately designed, such as fatigue, fretting, and wear caused by cyclic loading conditions from the cable's motions. Many studies in the literature have presented results from numerical simulations and experiments of armored dynamic power cables [18][19][20][21][22][23]. Most of them emphasized bending-induced loading conditions and fatigue experiments since this loading mode causes wear and fretting damage to the cable's parts and components.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of the Mechanical Properties of Low Stiffness Marine Power Cables through Tension, Bending, Torsion, and Fatigue Testing

Ringsberg,

Dieng,

et al. 2023

JMSE

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The exploitation and harnessing of offshore marine renewable energy have led to an increased demand for reliable marine power cables with long service lives. These cables constitute a considerable share of the total installation cost of offshore renewable energy facilities and have high maintenance and repair costs. The critical characteristics of these power cables must be determined to reduce the risk of exceeding their ultimate strength or fatigue life, which can result in unwanted and unexpected failures. This study investigates dynamic marine power cables that are suitable for application in devices that harness energy from ocean currents, waves, and tides. Tension, bending, torsion, and fatigue tests were conducted on three dynamic power cables (1 kV, 3.6 kV, and 24 kV) that have high flexibility, i.e., low mechanical stiffness. The specimen lengths and axial pretension force were varied during the tests. The results are discussed in terms of the mechanical fatigue degradation and ultimate design load, and the key observations and lessons learned from the tests are clarified. The study’s main contribution is the results from physical component testing of the dynamic marine power cables without metallic armors, which can be used to calibrate numerical models of this type of dynamic marine power cable in the initial design of, e.g., inter-array cables between floating wave energy converters. The benefits offered by this type of cable and the importance of the results for creating reliable numerical simulation models in the future are highlighted.

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Section: Discussionmentioning

confidence: 65%

Section: Introductionmentioning

confidence: 99%

Characterization of the Mechanical Properties of Low Stiffness Marine Power Cables through Tension, Bending, Torsion, and Fatigue Testing

Ringsberg,

Dieng,

et al. 2023

JMSE

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show abstract

“…Leveraging the advantage that finite element simulation can substitute the high cost of experiments, the finite element method proves instrumental in enhancing the efficiency of cable optimization, especially in fatigue life calculations [ 25 ]. Suh et al investigated the impact of stress amplitude and average stress on the fatigue life of multi-strand cables under axial loading using FE-safe fatigue analysis software [ 26 ]. Finite element simulation is a numerical method based on mathematical modeling that has become a powerful tool for predicting the fatigue life of structural systems [ 27 ].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Fatigue Life Analysis of Motion Cables in Sensors under Cyclic Loading

Liang,

Guan,

Ding

et al. 2024

Sensors

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Motion cables, which are widely used in aero-engine sensors, are critical components that determine sensor stability. Because motion cables have unique motion characteristics, the study of their mechanical properties and reliability is very important. In addition, motion cables are complex in structure and cannot be applied to conventional fixed cable research methods. In this study, a new approach is proposed to introduce the theory of anisotropic composites into a simplified cable model, so that the cable is both physically conditioned and has good mechanical properties. While applying the theory of anisotropic composites, the forces of tension and torsion are considered in a motion cable under the combined action. In this context, the reliability of the structure is the fatigue life of the cable. In this paper, the mechanical properties and fatigue life of motion cables are investigated using the finite element method at different inclination angles and fixation points. The simulation results show that there is a positive correlation between the inclination angle and the extreme stress in the motion cables, and the optimal inclination angle of 0° is determined. The number of fixing points should be reduced to minimize the additional moments generated during the movement and to ensure proper movement of the cables. The optimal configuration is a 0° inclination angle and two fixing points. Subsequently, the fatigue life under these optimal conditions is analyzed. The results show that the high-stress zone corresponds to the location of the short-fatigue life, which is the middle of the motion cables. Therefore, minimizing the inclination angle and the number of fixing points of the motion cables may increase their fatigue life and thus provide recommendations for optimizing their reliability.

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“…Compared to the number of research studies focusing on the dynamic response of the FOWTs, the number of publications dedicated to the design and analysis of dynamic power cables is relatively limited. Sobhaniasl et al [36] focused on evaluating the fatigue life of dynamic inter-array power cables for FOWTs. They proposed a comprehensive methodology that accounts for the complex dynamic interactions between the cables and the marine environment.…”

Section: Introductionmentioning

confidence: 99%

“…The research highlighted the critical importance of accurate fatigue assessment in ensuring the reliability and longevity of power cables in FOWT applications. The power cable model in Sobhaniasl et al [36] was taken from Rentschler et al [37], who presented a novel approach for the design optimization of dynamic inter-array cable systems in floating offshore wind turbines. The study by Rentschler et al [37] was based on dynamic simulations of an OC4 FOWT with an attached dynamic power cable and employed a genetic algorithm to find the optimal distribution of buoyancy modules and optimal lazy wave geometry.…”

Section: Introductionmentioning

confidence: 99%

Reference Power Cable Models for Floating Offshore Wind Applications

Janocha,

Ong,

Lee

et al. 2024

Sustainability

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The present study aims to address the knowledge gaps in dynamic power cable designs suitable for large floating wind turbines and to develop three baseline power cable designs. The study includes a detailed database of structural and mechanical properties for three reference cable models rated at 33 kV, 66 kV, and 132 kV to be readily used in global dynamic response simulations. Structural properties are obtained from finite element method (FEM) models of respective cable cross-sections built in UFLEX v2.8.9—a non-linear stress analysis program. Extensive mesh sensitivity studies are performed to ensure the accuracy of the predicted structural properties. The cable’s structural design is investigated using global response simulations of an OC3 5MW reference wind turbine coupled with the dynamic power cable in a lazy wave configuration. The feasibility of the present reference cable in floating offshore wind applications is assessed through a simplified analysis of cable fatigue life and structural integrity analysis of the cable in extreme environmental conditions. The analysis results suggest that the dynamic power cable does not significantly affect the response characteristics of the floating wind turbine in the analyzed lazy wave configuration. Furthermore, a simplified fatigue analysis demonstrates that the proposed cable design can sustain representative environmental loading scenarios and shows favorable dynamic performance in a lazy wave configuration.

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Fatigue Life Assessment for Power Cables in Floating Offshore Wind Turbines

Cited by 20 publications

References 21 publications

Characterization of the Mechanical Properties of Low Stiffness Marine Power Cables through Tension, Bending, Torsion, and Fatigue Testing

Characterization of the Mechanical Properties of Low Stiffness Marine Power Cables through Tension, Bending, Torsion, and Fatigue Testing

Mechanical Properties and Fatigue Life Analysis of Motion Cables in Sensors under Cyclic Loading

Reference Power Cable Models for Floating Offshore Wind Applications

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