超大型浮体柔性连接器动响应研究

Study on dynamic response of flexible connectors of very large floating structures

为了降低VLFS(超大型浮体)模块连接的巨大载荷,通常选择柔性连接器.本文以某横向浮筒式的浅吃水超大型浮体为研究对象,采用RMFC模型(刚性模块柔性连接器)分析连接器载荷和模块运动响应,并与三模块模型试验进行比较验证.通过较高和较低横向刚度的系列纵向和垂向刚度组合的连接器载荷计算,给出连接器载荷随刚度变化的关系,分析连接器载荷峰值出现的原因.针对连接器载荷峰值对应的刚度组合,计算模块运动响应,分析模块相对运动模式.研究结果表明,对于较高和较低的横向刚度,均存在一定的纵向和垂向刚度组合,导致连接器载荷出现较大的峰值;连接器载荷峰值对应浪向角85°左右的海况,模块相对运动主要表现为艏摇.

Flexible connectors are usually selected to reduce the huge load of modular connection of VLFS (Very Large Floating Structures). In this paper, the RMFC model (Rigid Module Flexible Connector) is used to analyze connector load and motion response of a VLFS with shallow daft and transverse pontoon and comparative verification with a model test of three modules is conducted. The relationship between connector load and rigidity is given based on calculation of serial combination of longitudinal and vertical rigidity with a higher and a lower transverse rigidity and the peak occurrence of connector load is analyzed. Motion response is calculated and motion mode is analyzed on the rigidity combination corresponding to the connector load peak. The results show that whether the transverse rigidity is high or low, there exists a combination of longitudinal and vertical rigidity which may cause the connector load peak. The connector load peak usually occurs when the wave-to-course angle is about 85° and the main motion mode is a combination of surge and yaw.