弹性连接下双动力定位船托举平台的动力特性

Dynamic Responses of Twin Dynamic Positioning Vessels Lifting Platform with Elastic Connection

采用双船浮托法托举海洋平台时,半潜船与上层建筑的相对位移较大,利用传统的刚性连接方式易导致对接处出现应力集中现象,在波浪作用下上层组块有掉落的风险。针对这一情况,采用一种能进行运动解耦的弹性连接系统开展水池试验,对波浪作用下多浮体系统的运动响应进行研究。结果表明,多浮体系统存在有别于单船固有横摇频率的特有频率,在多个方向波浪的作用下,上层建筑和半潜船之间相对运动著。对该现象进行分析,并将所得结果与理论计算和机械系统动力学自动分析(ADAMS)的仿真结果相对比,确定该特有频率为多体系统的固有频率,为设计阶段提升双船拆平台系统的安全性提供参考。

When the offshore platform is lifted by the double ship floating method,the relative displacement of the semi-submersible ship and the superstructure under the double-ship floatation method is more obvious.The traditional rigid connection method is prone to stress concentration at the docking place.Under the action of waves,there is a risk of the upper-layer blocks falling.An elastic connection system capable of decoupling motion is used to carry out a pool test to study the motion response of the multi-floating system under the action of waves.The results show that the multi-floating system has a unique frequency that is different from the natural roll frequency of a single ship,and the relative displacement is significant under the action of waves in multiple directions.This phenomenon is analyzed and compared with the results of theoretical calculation and ADAMS simulation,and the unique frequency is determined to be the natural vibration frequency of the multi-body system,which provides a reference for improving the safety of the dual ship demolition platform system.