气浮筒型基础结构横荡及纵摇水动力系数研究

Study on swaying and pitching hydrodynamic coefficient of air-floating bucket foundation

筒型基础作为一种新型的基础形式已经广泛的应用于海洋资源的开发。基于近海风电场快速建造的"大尺度筒型基础的浮运拖航"关键技术以及筒型基础作为边际油田开发的基础形式的研究背景,该文对海洋环境荷载作用下筒型基础的运动响应进行了相应的研究和分析。通过引入考虑气垫影响的无因次参数?处理筒内气水界面的非线性边界条件,并基于三维势流理论采用半解析法的特征函数展开和匹配渐进法得到气浮筒型基础结构的横荡、纵摇下辐射运动的基本规律。并以CBF-3-150海上风电复合筒型基础为例,应用上述理论,运用MATLAB编程平台编制计算程序,求解得出该结构的横荡、纵摇水动力系数。

Bucket foundation has been widely used in the exploitation of ocean resources as a new style foundation. Based on the background of the key technologies of air-cushion towing of the rapid construction of large-scale bucket foundation in offshore wind farms and the foundation type in exploitation of marginal oil fields, the motion responses of bucket foundation are studied in this paper. The nonlinear boundary conditions on the gas-water interface in the bucket are coped with by the introduction of the dimensionless parameter a considering the influence of air cushion, and based on the three-dimensional potential flow theory using the semi analytical method of eigenfunction expansion and progressive matching method, the basic laws of heave are studied, Taking composite foundation CBF-3-150 of offshore wind turbine as a case, swaying and pitch hydrodynamic coefficients are solved by a calculating program using programming platform MATLAB.