The presented problem was addressed using mathematical modelling with consideration for a number of defining parameters, which include external forces such as current velocity and design parameters such as cable diameter. This study focuses on the fatigue failure of cables that will cause large hang-off loads based on catenary configuration after laying operation. In order to ensure that subsea cables are laid out diligently, the analysis of subsea cable tension during the laying operation is crucial. Subsea cable laying is a risky and challenging operation faced by engineers, due to many uncertainties arise during the operation. The result of these solutions suggests that the percentage of slack can be reduced by the increase of the prescribed cable tension, and also the increase in either the drag coefficient of the sea water or the bending stiffness of the cable, similarly will result in lower slack percentage. There are two solutions generated in this article numerical and asymptotic solutions. Non-dimensional system is used to scale the engineering parameters and grouped them into only two main parameters which are the hydrodynamic drag of the fluid and the bending stiffness of the cable. Due to the complexity, the model is developed for a steady-state problem assuming velocity of the vessel is constant, seabed is flat and the effect of wind and wave is insignificant. The current problem was addressed using a mathematical model by considering a number of defining parameters such as the external forces, the cable properties and geometry. In order to control wastages during installation, the slack needs to be minimized and the movement of a ship/vessel needs to be synchronized with the cable being laid out. It is very often that the cable being laid out is not perfectly fit on the route being planned, which results in the formation of slack. Subsea cable laying process is a difficult task for an engineer due to many uncertain situations which occur during the operation.
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