自升式海洋平臺樁腿的結構強度分析及優(yōu)化設計
[Abstract]:Jack-up drilling platform is a mobile offshore platform, which is most commonly used in offshore oil development. The offshore platform is the basic facility for the exploitation of offshore oil and gas resources. The marine environment is harsh, such as wind, waves, currents, earthquakes and other disasters threaten the safety of the platform structure, structural fatigue strength and ultimate strength are seriously affected. As the supporting structure of the offshore platform, the pile leg affects the safety and stability of the platform, and the material used for the pile leg is expensive. Therefore, the dynamic performance of the pile leg should be considered in the optimization of the pile leg, so the multi-objective optimization based on the dynamic performance is adopted for the pile leg. First of all, the static and dynamic analysis of the self-elevating offshore platform is carried out. A three-dimensional model of a self-elevating offshore platform is established by using software. Five working conditions are discussed according to the incident angle of the environmental load, the boundary conditions are applied according to the code, the load is applied according to the deck load diagram, and the static analysis is completed. The most dangerous condition is selected for dynamic analysis, and the yield and buckling strength of pile leg are checked. Secondly, the single-objective optimization of the pile-leg structure is carried out. Taking pile leg thickness as design variable, dynamic displacement, dynamic stress and natural frequency as constraint conditions, the quality is taken as objective function in optimization. If the minimum mass is considered, the value deviation of pile leg thickness and the lower limit of design variable are considered. However, the acceleration of the vibration of the platform increases, so it is necessary to carry out multi-objective optimization. Finally, the multi-objective optimization of the pile leg is carried out. Firstly, the sensitivity of the design variable to the acceleration of the pile leg is analyzed, and the same design variables and constraint conditions as the single objective optimization are adopted. The objective function is the minimum mass and the minimum acceleration under self-stored condition.
【學位授予單位】:浙江海洋大學
【學位級別】:碩士
【學位授予年份】:2016
【分類號】:U661.43
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