Study On The Security Of Mooring Ship Under Typhoon State

In the 21st century, with the increasing demand for human resources, the development and prosperity of world seaborne trade is rapidly growing. The construction of ships and ports are larger in scale, more specialization and automation. However, China's coastal are more likely to be Typhoon disaster areas. Annual economic losses and casualties caused by typhoon are very serious. Due to the variability and sudden of environmental load, there was often a large gap between engineering calculations and the real situation. Marine accident caused by typhoon, to some extent, has hampered China's economic development.In this paper, a large cutter suction dredger was taken for the study. Environmental loads of the ship in mooring were analyzed. Equilibrium equations were established based on static analysis and solved by pattern search. Dangerous angle between wave and current which may lend to fender failure was founded by calculating and comparing. On the basis of static analysis, the time-domain model were established and calculated in different wind speed, velocity, wave height in time Domain. The results of the ship mooring force-time curve were obtained and the movement of the ship are simulated. The results show that, for the ship, when the wind speeds close to 25m/s, the reinforcement should be taken in order to ensure the safety of ships and terminals.In the final chapter of this paper, the finite element method for the local structure of the ship was introduced. Some discussions were made about structural safety of the ship. The transient response analysis was applied to calculate the stress distribution in a typical typhoon conditions. The structural safety of the ship was some discussion and research.