Research On Barge Numerical Simulation Analysis In Float-over Installation

In recent decades,with the development of the offshore oil industry,the problems during the topsides installation are solved by float-over technology,and this technology is widely used as an economic,stable and efficient offshore platform installation technology.As the main installation equipment,the accuracy of barge's motion response prediction is significant in reducing the risk of float-over installation and improving the platform installation efficiency.The main works and innovations are as follows :The article selects three-dimensional potential flow theory according to the comparison result between two-dimensional strip theory and three-dimensional potential theory.This paper analyzes barge's motion response by this theory,obtains the equation of frequency domain response of movement,the first order wave forces and the second order wave forces.The calculation method of added mass and damping coefficient is illustrated.In the process of slippage shipment,through the application of Workbench-Aqwa module,the numerical analysis of frequency and time domain motion responses of T empty barge is carried out in different wave incident angles.In the frequency domain,six degree of freedom motion response of barge and its wave forces are researched.In the time domain,the article analyzes and compares two kinds of mooring system in the process of barge shipping in the longitudinal slip.Results show that cables' tension distribution is more uniform with parallel and symmetrical arrangement.In the process of load transformation,the motion response of the load barge is analyzed in the frequency and time domain.In the frequency domain,the wet surface model of the barge is established.Six degree of freedom motion response amplitude operator,added mass and damping coefficient are studied in different water depths.The result showed that the load barge motion response was the maximum in the effect of beam sea.In the time domain,the paper researches the real-time motion state of the barge in the combined effect of different wind,wave and flow and obtains the most recommended installation condition.Combining with the actual installation project,the article optimizes the mooring system and makes the whole movement response of T load barge meet the requirements for the offshore installation.This paper provides a certain reference value for the same type of barge offshore installation smoothly.