应用于海洋平台的拖链结构设计与数值分析

Design and numerical analysis of drag chain structure for offshore platform

[目的]拖链作为海洋平台上的管线防护设备,是海工装备研发的关键技术之一。为研究拖链的拓扑关系及其结构强度,以某大型拖链的设计为对象进行研究。[方法]首先,根据内链与外链间的铰接关系和内链板上的铰接孔与圆弧形槽之间的几何尺寸关系,对拖链进行拓扑分析,以得到影响拖链回转半径尺寸的因素,即拖链旋转角和节距。然后,运用ANSYS Workbench对拖链的结构强度进行分析,得到拖链在空载时的结构响应。并在此基础上保持原有边界条件不变,增大材料密度来模拟拖链承载时的受力状态,最终得到极限承载力。[结结果]结果表明,拖链回转处的铰接轴承受的应力最大。[结论]通过分析,验证了该拖链设计在海洋平台上的应用具有较高的可靠性。

[Objectives]As one of the key marine equipment technologies,drag chains can provide protection for pipelines on offshore platforms.In order to study the topological relationship and structural strength of drag chains,we take one large drag chain as the research object.[Methods]First,according to the articulated relationship between the inner chain and outer chain,as well as the geometric dimension relationship between the articulated hole and circular arc groove of the inner chain plate,the topological relationships of drag chain are analyzed.The factors,rotation angle and pitch affecting the gyration radius of the drag chain are then acquired.Next,we adopt ANSYS Workbench to analyze the structural strength of the drag chain and obtain its structural response in an unloaded state.On this basis,we retain the original boundary conditions and increase the material density to simulate the stress state of a loaded drag chain,and the ultimate bearing capacity of the drag chain is acquired.[Results]The results show that the articulated shaft at the turning of a drag chain bears the greatest stress.[Conclusions]The findings of this paper show that drag chains are reliable in their use on offshore platforms.