两型半潜式平台波浪作用下载荷敏感性研究

Comparative analysis of load sensitivity of two types of semi-submersible platforms under wave action

为探究半潜式平台在波浪作用下的载荷敏感特性,根据频域计算得到的水动力衍射/辐射结果,将动水压力作为输入项,利用ANSYS软件进行两型半潜式平台对波浪载荷的敏感性分析。以此对比两型平台响应特性,确定危险工况,并为平台整体结构设计提供参考。其中A型平台为柱稳式半潜平台,B型平台以A型平台为母型进行了水动力性能优化,以适用于北海海域作业环境。研究发现:两型平台的应变均在弹性形变范围内;两型平台会在相似位置处出现较大的等效弹性应力和应变分布,但相比于母型平台A,B型平台在立柱与浮体连接处也存在明显的高应力区;各波浪入射角度下,两型平台的入射波浪最危险周期不同,且存在B型平台响应大于A型平台响应的工况,因此基于水动力性能改进的B型平台,结构上可能存在不足。

Based on the frequency domain analysis,the hydrodynamic pressure is taken as an input to analyze the sensitivity of two types of platforms A and B to wave load by using ANSYS,so as to determine the dangerous working conditions and provide reference for the overall structural design of the unit.Platform B is with the improvement of hydrodynamic performance based on Platform A which is a column-stabilized semi-submersible platform,so as to be suitable for the operating environment of the North Sea.It is found that the strain of the two types of platforms is within the range of elastic deformation.The two types of platforms have the similar stress and strain distributions,but compared with Platform A,there are also large stress and strain values at the joints between the columns and the pontoons for Platform B.Under different wave angles,the most dangerous periods of the two types of platforms are different,and the response of Platform B is higher than that of Platform A in some cases.Consequently,for Platform B with the improvement of hydrodynamic performance,there may be some structural deficiencies.