基于半潜式超大型浮式结构“刚性模块-柔性连接构件”计算模型,以其中典型的移动式海上基地(Mobile Offshore Base,MOB)作为对象,研究该结构时域动力响应的简化计算方法.经理论推导得到D'Alembert动力学平衡方程中MOB运动的各水动力系数矩阵、波浪激励力矩阵及连接构件约束力矩阵内各系数的简易计算公式.以“三模块模型”MOB为例,探讨其在6级海况浪向角在O°～90°变化时,各模块的动力响应位移随时间的变化规律,并统计其最大值与文献资料中的实测结果进行对比.经研究表明:运用本文理论模型和简化算法的数值计算结果与文献中的实测数据能够相互吻合,可验证本算法的正确性、可行性与合理性,研究成果可为半潜式超大型浮式结构动力响应分析提供一定的理论支撑.%This paper investigates a simplified calculation method on the dynamic response of mobile offshore base (MOB) which is the typical model of semi-submersible very large floating structure.The time domain analysis about the motion displacement of MOB modules by this algorithm has been researched based on rigid modules and flexible connector models.Some simple formulae about hydrodynamic coefficients matrix,the wave stimulated load matrix and constraint force of the connector matrix of MOB module motion in D'Alembert dynamical equations are derived.Moreover,this paper regards a 3-module model of MOB as a numerical example,and the changing rules between dynamic response displacements of each MOB module with time have been discussed under wave angles changed from 0° to 90° at sea state six.The maximum numerical results from this paper's simplified method are compared with the measured values in references,and the final conclusions indicate that the theoretical calculated values in this paper are very similar with tested data according to references,which the correctness and rationality of theoretical model and simplified method in this paper can be verified.The research achievements can provide theoretical supports on the dynamic response analysis of semi-submersible very large floating structure.
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