STUDY ON THE RELATIONSHIP BETWEEN MOORING FORCE AND WAVE PERIOD FOR A MOORING OIL TANKER

In this paper mooring condition of a 315000DWT oil tanker under wave action was simulated and computed by ship-mooring analysis software. The mooring conditions include the six degrees of freedom, the cable and fender force. The wave period varies from 4s to 30s. The results indicated that the maximum mooring force has a positive relationship with wave period when wave height keeps the same and the extreme value appears when the peak period approaches the natural rolling period of the ship. When the peak period approaches twice rolling period, the mooring force has a new extreme value, which is far beyond the allowed scope. In another aspect the ship motion has a similar discipline with the mooring force. Thus, the damage of resonance between ship and long wave period should be paid more attention in the berth design.