New Method for Solving Optimal Design Problem of Equivalent Water Depth Truncated Mooring System

The highest similarity degree of static characteristics including total mooring system both horizontal and vertical characteristics,as well as the static characteristics of the representative single root mooring ropes between the truncated and full depth system are obtained by Annealing Simulation Algorithm for Hybrid Discrete Variables(ASFHDV) in optimal design of equivalent water depth truncated mooring system.An optimum pattern "baton" applied to optimal design ASFHDV is put forward in the paper.If some variable reaches the upper limit or the lower limit,the upper limit needs to be extended and the lower limit needs to be reduced after each optimizing step.Considering the experimental requirements,the length of wire rope at the upper extreme is not less than eight meters,and also the diameter of the cable at the end of is greater than 0.03 meters.A 100,000t,turret mooring FPSO in water depth of 320m is taken as an example of equivalent water depth truncated mooring system optimum design and the calculation is performed to obtain the conformation parameters of the truncated mooring system.Numerical experimentation result indicates that the present truncated mooring system design is successful and effective.