Analysis Of Motion For Engineering Barge In Survive And Operation

The large amplitude rolling which occurs for the engineering barge in high seas seriously affects the operating of barge. In order to prevent the accident causing huge losses, it is very important to analyse the motion response of the offshore engineering barge in storm survive and operation.In this paper, the author deduces the catenary curve's equation, forecasts the tension in the mooring line and the minimum length of the mooring line in storm survival condition with the theory of catenary curve which help to achieve the security calculation of ship in storm survival condition.Also the ship's response of rolling,swaying motion is analyzed and calculated. Considering the effects of lifting load, wind, wave and current, the author creat model of a ship with eight anchors in mooring states and developed programme for analysing ship's motion with the motion theory of ship on wave. Through calculating motion response of ship with the effects of wind, wave, current and other factors, the author get the rolling and swaying amplitude of the ship in different seas and different mooring status.With the help of software Moses, the author create programming sentences for calculating in order to get the motion response in frequency domain. The calculation show that the results that we get from the two methods—Moses and traditional method are almost the same.The analyse of this paper indicates that it's feasible to forecast the motion response of ship in mooring status with the method proposed in this paper, especially for multi-point mooring status. This method which is simple, efficient can be a effective engineering method for forecasting the motion of ship in mooring status.