Numerical Analysis Of Mooring System Of M Type Ship Based On AQWA

With the improvement of people's living standard,tourism develops rapidly in recent years,ships have also become a new choice for the travel.In response to such demands in society,China has developed a fast ferry service for short distance travel on the main river such as Pearl River delta,Yangtze River delta which request for ships with good comfortablity and economic benefit.In recent years,high quality ships such as Hydrofoil boat,catamaran hovercraft,and channel boat have sprung up.However most of them can work only under limited situation and hardly meet the requests of speed,power,navigability,good stability and high economic efficiency at the same time.While M type ship which has advantages from single gliding boat,high speed catamaran and hovercraft has shown its superior in regions of wave elimination performance,load,maneuverability and high speed sailing against wind and waves.It will become a competitive options for coastal short-distance passenger transportation in the future.Because of sustaining transport mission,ships must enter harbor to exchange passengers or hide from storms when they sail at coastal area.At such moment,mooring system can help ship resist external load and keep steady.Motions of moored ship are also critical to the the design of harbor.The crash of ships,especially ferry,may damages not only ships structure but also stability of harbor.When ships encounter huge load from the impact of wind and waves,it may motivate dramatically which let mooring lines sustain great tension.Failure because of lack of strength among lines often occurs at such circumstance which may damage ships,harbor even people.So the analysis about mooring system and moored ships' motion has became essential.This thesis did the research,which base on three dimensional potential flow theory,on target ship(M type ship)for its hydrodynamic performance and mooring form through ANSYS-AQWA.The chapters are as follows:(1)Introduce mooring line,mooring environment factors among mooring system.As lacking of access to research about M type ship,this thesis also refer to other type of ships like Trimaran,Channel Boat,etc for the data about hydrodynamic analysis.And summarize the motion response during the mooring of the wharf.(2)Based on the function of ANSYS-AQWA software,the surface wave theory and environmental load calculation in potential flow theory are analyzed in detail,and thereliability of AQWA software is verified.Complement about ships' static force during mooring process is also conclude in the thesis.(3)The frequency domain computing model construction process is based on ANSYS-AQWA.Furthermore,hydrodynamic performance analysis part are launched by using AQWA-LINE model.This thesis also detailed discuss the hydrodynamic coefficients like added mass,Radiation damping and response amplitude operator on M type ship.Summarize the action of excited force and steady drift force on M type ships,and compare the analysis of the calculation results of a common type ship with the same main size and displacement as the M type ship.Obtain the hydrodynamic performance of M type ship.(4)Further work about M type ship moored situation can be done after the analysis in frequency domain in(3).After considering two different types of mooring scheme,this thesis characterizes the M type ship mooring system which mostly concentrate on symmetry angle,number of mooring lines which may affect tension.Position where chains are placed is also concluded in this section.(5)The last section is about M type ship mooring system in the wharf which proceed above other sections.The thesis considers the common straight wharf system under various environment elements.Then this research is conducted in the U type wharf.Last but not least,the thesis makes a systemic summary on how elements like wind,wave,fluent and place may affect the M type ships mooring system in the U type wharf,and shielding effect of U type wharf.