Abstract
For the study of the double wave configuration for the dynamic power cable of a Floating Offshore Wind Turbine (FOWT) in shallow water, this paper presented a comparison of the hydrostatic and hydrodynamic performance between a lazy wave and a double wave configuration. The double wave shape’s parametric presentation was first developed based on an extension of a previous parametric lazy wave shape. An aero-hydro-servo-elastic integrated model fully coupling the FOWT and the dynamic power cable was then proposed in the SIMO/RIFLEX code for numerical simulation. Subsequently, the strain-cycle curve and the rain flow counting method were employed to estimate the copper conductor’s fatigue damage. The bending moment was proved to provide the major fatigue contribution. The results showed that the double wave offered superior performance than the lazy wave. The second arc of the double wave configuration was proved critical for suffering high curvature, tension, and fatigue damage. A lower position and less hogged wave arc were suggested for the determination of the double wave shape.
Highlights
Floating wind has been stepping up as an essential role of energy transmission in recent years
The results showed that the performance of the lazy wave shape is superior to that of the catenary shape in reducing the maximum tension and fatigue damage cycles
An aero-hydro-servo-elastic integrated model fully coupling the floating offshore wind turbine (FOWT) was proposed in the SIMO/RIFLEX code for numerical simulation
Summary
Floating wind has been stepping up as an essential role of energy transmission in recent years. From an individual unit to multiple units, the expanded quantity of wind turbines forms a subsea inter-array of dynamic export cables. The dynamic power export cable, known as umbilical, deployed in the floating offshore wind turbine (FOWT), is an essential subsea power transmission component. As floating wind technology is gradually maturing to commercial use, the innovative design of dynamic power cable has become a challenge to withstand extreme dynamic load and cyclic fatigue damage. Most of the investigations and design practices of dynamic cables are based on the experience of flexible pipeline design from the oil and gas industry, referring to the flexible riser and umbilical
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