| Steel catenary riser(SCR)is a key medium for connecting underwater wellheads and floating production facilities.Its installation and tie-back operations usually require the coordination of marine equipment including operation ships,offshore platforms,and remote operated vehicles.When using actual offshore engineering equipment for staff training,there are problems such as complicated operating procedures and certain risks.Joint exercises based on virtual simulation can effectively improve operation safety and economic benefits,and help operators get a good immersive experience at the same time.In order to realize the visual and numerical simulation of the SCR tie-back operation,and to carry out the collaborative exercise of multi-station operators for this process,the functions of different subsystems are integrated through a distributed interactive simulation platform to complete operation tasks such as riser pick-up and load transfer for specific engineering requirements.The main research content includes:(1)The overall design of the simulation platform for SCR tie-back operations: the functional requirements and logical structure of the simulation platform are determined according to the engineering operations.Based on the high-level architecture and multi-body dynamics theory,develop the software and hardware system environment and human-computer interaction interface are developed to build the overall framework of the simulation platform and its subsystems;(2)Motion analysis of the semi-submersible platform with the mooring system: the mathematical model of the operation is established based on the kinematics and dynamics theories of the semi-submersible platform,and the mechanical model of the mooring system is established by the catenary method.The environmental forces are added in the simulation model to carry out motion analysis of the platform with the mooring system;(3)Development and verification of the simulation platform for SCR tie-back operations:in accordance with the overall flow of SCR tie-back operations,a mathematical model of the coupled motion of the SCR,semi-submersible platform and operation ship is established,and a multi-body dynamics engine is used to build the simulation platform and develop system functions.The results obtained by the simulation platform are compared with commercial marine engineering simulation software for verification;(4)Joint exercise for SCR tie-back operation: based on actual project requirements,the operator positions in the joint exercise are set,and the whole process of SCR tie-back operation is simulated through the design and execution of simulation subjects.Analysis on numerical results and engineering application is carried out based on the coupled response of the marine structures during each operation stage and under emergency conditions.The simulation results of the SCR tie-back operation simulation platform show that the platform has both good real-time performance and high calculation accuracy of virtual simulation.It can realize the functions of simulation for mooring system positioning,ship motion and riser recovery operations.It can also effectively accomplish visual and numerical simulation as well as multi-operator collaborative exercise at each key stage of SCR tie-back operation under different environmental conditions.That provides reference and suggestions for the training of operators and for project plan rehearsal in the actual marine SCR tie-back operation. |
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