| Semi-submersible platforms are widely used in offshore engineering because of their small waterplane and large load capacity.Based on the production and living at sea with very large floating structure as a target object,aiming at the semi-submersible platform module structure geometry optimization selection,heaving plate and mooring system optimization design and deck structure dynamic response characteristics and so on to carry on the research,the optimization design of super large floating body itself and on the dynamic response analysis of the structure of the bearing.The specific research work includes the following aspects:1、This paper studies the structure selection of semi-submersible platform as a single module of very large floating structure.Based on the three-dimensional potential flow theory,the hydrodynamic performance of different platform scales is analyzed by using ANSYS/AQWA software,the main scale of the platform is determined,and the different layout directions of the floating body are discussed.2、Taking the semi-submersible Heave Plate platform as the research object,the motion response of the platform under different depth of Heave Plate placement is analyzed by using AQWA software to determine the appropriate placement depth.Then,the influence of the number of heave plates on the heave response of the platform is further explored.Finally,the influence of different opening rate of Heave Plate on the heave response of the platform is compared.3、The mooring scheme of 1000 m deep sea semi-submersible platform is designed.The dynamic response characteristics of the platform structure under the tension mooring system are studied by using the hydrodynamic analysis software Aqwa.The relationship between the pre tension,the position of the fairlead hole and the pre tension angle and the positioning performance of the platform mooring system is studied to optimize the mooring scheme design.4、Taking the steel frame structure of a 1000 m deep-sea semi-submersible platform as the research object,the dynamic time history response of three story,six story and nine story superstructure under marine environmental load is simulated by finite element method.Then,according to the response results,the more appropriate structure height(number of stories)is selected as the recommended height(number of stories),and the structure within the recommended height range is further analyzed The finite element simulation of dynamic time history response under land earthquake is carried out.Finally,compare with the dynamic time history response results of steel frame structure under different loads.Discuss the dynamic response characteristics of semisubmersible platform structure under marine environmental load,so as to provide reference for the design of offshore platform structure.There are 54 pictures,19 tables and 99 references in this paper. |
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