Research And Numerical Simulation On Dynamic Positioning System Of Multi-vessels Arranged Side-by-side

With the continuous exploitation and utilization of source in deep sea,the exploration on the position style of floating structures (Semi-submersibleplatform and Floating Production Storage and Offloading Ship) has graduallybecome the focus of current research. Dynamic positioning system hasattracted more and more concern due to the fact that its cost barely increasesas the water depth increases. At the same time, as the increasing demand oftransportation and exploitation of maritime resources, many multi-bodysystems are emerging and used at sea (including side by side and head toend arrangement). Since hydrodynamic interaction between two bodies of thesystem is very complex, as well as shielding and exaggerating effects of wavemotion appear in certain areas, the forecast of relative motion and load ofeach body becomes more difficult. This paper considers the effect ofhydrodynamic interaction during the side-by-side process on the two vesselsutilizing DPS. Take Floating Production Storage and Offloading Ship andshuttle tanker arranged side by side as the numerical instance. Firstly,investigate the influence of the hydrodynamic interaction characteristics of afloating body with another one in close proximity, and the main point is tostudy the change regulation of motion responses on surge, sway, yaw andsecond-order wave force. Apply frequency domain potential theory to solvethe problems of hydrodynamic interactions. During the numerical procedure,the wave angles and distances between two vessels are of several values inorder to observe the variation tendency of hydrodynamic coefficients,second-order wave load of surge, sway and yaw. Secondly, convert thefrequency-domain results into time-domain, and take the varied second-orderwave load into consideration of external environmental forces. Study itseffect of positioning accuracy and consumed power on the shuttle tanker. Finally, take several common thruster arrangement forms into account.Confirm the optimal thruster arrangement form through the comparison oftime-domain results including: positioning accuracy, consumed power amongdifferent arrangements. Establish the optimal design of thruster system ofmulti-vessel DPS arranged side-by-side.