Article: Understanding how buoys affect the catenary of a mooring line (TheNavalArch)

Hello, and greetings from TheNavalArch

We are glad to publish a new article titled Understanding how buoys affect the catenary of a mooring line

This article talks about a mooring line catenary and goes in-depth about how to incorporate the effect of adding a buoy to the catenary.

An excerpt is presented below:


A mooring line is just a suspended cable and so the shape it assumes is a catenary shape. The weight of the suspended length of the cable translates into tension at either end. For the offshore mooring line, the cable is anchored on the seabed and attached to the structure on top. If the vessel moves, the catenary shape changes thereby changing the tensions in the line. The further the top end is from the anchor, the larger is the suspended length and hence the tension is larger. This increased tension acts as a restoring force (stiffness) to the motions of the structure. The lines are laid out in a symmetric pattern to provide stiffness in all directions. Also, the change in tension with the offset of the structure is non-linear i.e. as the structure moves farther and farther, the rate of increase in tension is larger and larger. Thus the structure remains within a region for a given environment and the footprint of the structure’s offset is called a watch circle.


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Team TheNavalArch