Abstract
This paper presents a semi-analytical approximation for a two-dimensional (2D) tension analysis of submarine cables during laying operations. In the analysis, based on geometric compatibility relations and equilibrium equations, a set of non-linear differential equations are obtained. The present model considers effects of ocean currents, cable ship motion, pay-out rate, water depth and material properties on submarine cable behavior in water, which are crucial during laying operations. As shown in numerical examples, with consideration of currents and cable ship motion, the cable tension appears to be smaller and cable configuration curve tends to be fatter than the conventional catenary theory.
Highlights
In the last few decades, rapidly increasing expansions of telecom systems and exploitation of the oceanic natural resources demand intensive use of cables in marine environments
With a given initial value of elevation angle at touchdown point (TDP), the extrapolation method was proposed to confirm whether the calculated vertical coordinate of the laying wheel point equals water depth ( )
A 2D semi-analytical approximation for submarine cable was developed for the prediction of the configuration and tension distribution during laying operations
Summary
In the last few decades, rapidly increasing expansions of telecom systems and exploitation of the oceanic natural resources demand intensive use of cables in marine environments. Following the previous work for 2D model, Vaz et al [6] presented a formulation and numerical solution for the 3D transient behavior of cable during laying operations when the cable ship changes speed and direction in calm water with the presence of currents, which adopted conventional finite element method and Runge-Kutta technique to solve the problem. The vertical movement of a cable ship caused by waveinduced vessel motion adds a non-ignorable tension force at the laying wheel Prpic and his co-workers [9, 10] presented a two-dimensional model of cable dynamic accounting for the effects of head sea conditions. Hao et al [19] adopted the extrapolation method to analyze the effects of bending stiffness of the cable and current drag forces on cable tension and configuration, which required iterative computation until the accuracy satisfied permissible error. A parametric study will be conducted to examine the effects of ocean current and wave characteristics on cable tension and profile
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