The Research Of Mooring Movement And The Establishment Of The Three Dimension Visual To The Security System Of Semi-submersible Platform

3D scene technology is an emerging technology with potential application in the security and protection of deep water oil extraction semi-submersible platform.In this thesis,the technology of 3D scene was used in the design and development of the 3D scene system for the security and protection system based on the Liuhua 11-1 semi-submersible platform in the South China Sea,by which the system is able to realize the monitoring capability of the sea area of the platform through exporting animation scene.At last,the properties of developed system were testified in this thesis.In this thesis,the operating principle and the implementation model of the 3D scene system of the security and protection system of semi-submersible platform were studied.Next,the main hardware of 3D scene system was determined in the security system in order to meet the demand of 3D scene system.And the software design of 3D scene system was determined for satisfying the demand of security and protection system in scene,function and operability,which is based on the movement theory analysis of objects,design of 3D scene,editing of scene function.In this thesis,the second order differential equations with six unknowns were established according to the Newton’s second law for describing the movements in six freedoms of the semi-submersible platform.And the four unknown parameters of environmental loads,quality coefficient,damping coefficient and stiffness coefficient of equations were calculated by the methods of mathematical model calculation,finite element analysis and numerical fitting.Next,the law of motion in six freedoms of the semi-submersible platform was resolved by matlab,which were compared with the actual motion of the semi-submersible platform,to analyze the veracity and the rationality in the development of 3D scene system of the differential equations.In this thesis,the 3D models of target objects,platform and mooring lines were established by a software 3dsmax,and the model of virtual ocean scene and main interface was completed by another software Unity3 d.In order to enable the system to obtain the functions of communication interface,scene and interface operation,this thesis used C# language to edit functional scripts in the developing mode of Visio Studio.And in the 3D scene system,the motion scripts were edited to enable the target objects generate the precise movement effect,difference method was edited to resolve the differential equations and enable the platform generate the precise movement effect,and the method of spatial switching was edited to layout the mooring lines in the 3D space.In this thesis,the signal simulation system of security system’s signal acquisition device was developed,and the properties of the developed 3D scene system were tested in terms of interface performance and monitoring performance.The results showed that the developed 3D scene system could establish network connection with the security system,and could be applied to security system for real-time monitoring.