Research On Ballast Simulation Technology Applied To Deepwater Pipelay Crane Vessel

In the course of the offshore oil and gas exploitation, deepwater pipelay crane vessel is highly recognized for lifting and removing offshore oil components, launching offshore platform jacket, laying and repairing submarine pipeline. To guarantee safe lifting operations,crane vessel research has become increasingly mature. In this paper,ballast system of lifting pipelay vessel simulation system is deeply studied. Special and proper floating conditions of crane vessel need to be maintained in the process of hoisting process which is the main function of the ballast system. To realize efficient, intelligent regulation load simulation, the real time changes of ballast tank flow of ship ballast water pipe network system are simulated.In this paper, firstly by analyzing the crane ship stability criterion of the specification,static equilibrium equations model is established based on the working characteristics of pipelay crane vessel. And the calculated process of ballast load adjusting scheme simulation system is designed. Furthermore, the real-time stowage optimization model is established combined with a summary of the analysis by the multi-objective genetic algorithm the pros and cons of the proposed improvements. Advanced elitist nondominated sorting genetic algorithm II is proposed to be applied in automatic ballast system of deepwater pipelay crane vessel. Through the comparative analysis of improved front and rear ballast load adjusting scheme, the latter model proves to have good adaptability and more reasonable load-out results. In order to calculate node outflow of ballast network, this paper introduced the composition and design of ballast water pipeline system, the network calculated model of ballast system is also proposed based on the finite element method taking generated adjusting scheme as initial condition. Then, the mappings of isopiestic line in each period are achieved by using the splitting matrix method. The results of the practical examples prove the correctness and applicability of the corresponding solving method.Finally, the development environment,the prototype system architecture and data structures of crane vessel ballast simulation system are briefly described, and the applications of each module are verified. The results show that the system can be carried out for each ballast tank level monitor real-time changes. Besides, the different condition's optimization schemes can be generated automatically to enhance the operational efficiency, achieve security personnel training and engineering rehearsal purposes.