| With the rapid development of the global economy, the social demand of oil and gas resources is constantly increasing,but at present the oil and gas resources on land are dried up gradually. Therefore more and more offshore platforms are used for drilling offshore oil and gas resources. Currently offshore platform installating methods are mainly float-over method and lifting method. Compared with the lifting method, the advantages of float-over method are shorter time taken, smaller operational risk and lower installation costs. Therefore, the numerical simulation of float-over installation for jacket platform is of technological importance to engineering practice. On above opinions, the following work in this paper has been completed.Based on the three-dimensional potential flow theory, Sesam software is applied for T-barge and tugboat frequency domain analysis. Applying source-sink distribution method and velocity potential boundary conditions on the velocity potential decomposition to obtain hydrodynamic added mass, damping coefficients and a first-order wave excitation force, and get second order wave drift force based on far-field integration method.Establish the towed cable model which is calculated by means of the catenary model theory, combined with active force of hull, considerating environmental factors, the topside maneuvering towing transport model is set up on the basis of tugs and barges maneuvering model.The purpose is to simulate linear stability of towing system, motion of turning and maneuverability under environmental factors.Analyse the installation process of the jacket platform floarover. Establish the jacket platform model for domain coupling analysis which includes topside, jacket, fenders and mooring system.Discuss topside motion characteristics, LMU(Leg Mating Unit) load, tension of mooring systems and collision of fenders under different environment conditions, then compare these with the experimental results. |
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