Fast Calculation Method Of Mooring System And Its Application

Mooring systems are used for keeping floating structures on a fixed position in the water. It is suitable for different water depth, and has a great impact on the structure. The mooring system is composed of anchor chain and rope and connection. The anchor chain at the bottom is attached in the seabed and the connection connects the floating structure. With the continuous development of land resources, people inevitably trend in the use of new sea resources. The vast sea contains not only oil and gas resources, and has inexhaustible, reproducing waves and wind energy. And those resources and energy utilization sometimes require floating structures with mooring systems. The rapid calculation and application of the mooring system will have great use of space.The mooring line is affected by many external forces, like wind and wave and flow. Those forces make the problem complex. So we often simplify the mooring lines and discuss the configuration and tension changes. Mooring lines are constituted of different properties of several segments to meet the requirements of the mooring lines and have better force characteristics. Therefore, the analysis of the multi-section mooring lines is necessary. The calculation steps of multi-segment mooring lines are introduced. Apply the Chebyshev polynomial to fit forces of mooring lines. The fitting result is used in mooring-floating model.The relation of mooring forces and structure displacement is introduced. And the wave force of floating body is calculated by high order boundary element method. The accuracy of the models are verified through an example. The influence of the geometric nonlinear is compared in frequency-domain model and time-domain model.