吴梦宁, 余建星, 孙震洲, 段晶辉

(1. 天津大学 水利工程仿真与安全国家重点试验室，天津 300354; 2. 高新船舶与深海开发装备协同创新中心，上海 200240)

双整体式止屈器结构性能研究及优化设计

吴梦宁1, 2, 余建星1, 2, 孙震洲1, 2, 段晶辉1, 2

(1. 天津大学 水利工程仿真与安全国家重点试验室，天津 300354; 2. 高新船舶与深海开发装备协同创新中心，上海 200240)

建立了双整体式止屈器结构的三维有限元模型，模拟其在外部静水压力作用下的屈曲穿越过程，总结不同穿越破坏模式的产生条件及机理。对影响穿越破坏压力的主要参数进行敏感性分析，结果表明止屈器布置间距、两个止屈器的几何尺寸均会对整体止屈性能产生影响。在拟合的双整体式止屈器效率公式的基础上，依据非线性有约束优化理论，分别采用经典算法和智能遗传算法确定模型最优解，提出了一种兼顾结构重量与止屈性能的最优双整体式止屈器结构型式；并经计算分析，验证了该方法的可靠性和适应性。

双整体式止屈器；穿越模式；拟合公式；结构设计

Abstract: A finite element(FE) model was developed to simulate the crossover of the double-integral buckle arrestors(DIBA) under the ambient externa hydrostatic pressure. In this study, the condition and mechanism of different crossover modes during the process of arresting were summarized. Then, the impact based on series of structure parameters on the DIBA’s crossover pressure was studied. The results indicated that the arresting performance of the model could be affected by many factors, such as, the space between arrestors and the geometrical dimensions of each arrestor. After analyzing the result of sensitivity, a fitting formula on DIBA’s arresting efficiency was put forward in the paper. At last, the structure optimization model of DIBA was established, both arithmetic and genetic algorithms are introduced to solve the problem, which is based on the constrained nonlinear programming theory. The result shows that the optimal double-integral buckle arrestor is an advanced buckling arrest measure, with excellent arresting performance and lower structural weight. And the measure has been verified to have good performance in reliability and adaptability through calculation and analyse.

Keywords: double-integral buckle arrestors; crossover modes; fitting formulas; structural design

近年来，随着海洋油气资源勘探开发的重点开始转向深水及超深水区域，巨大外部静水压力及恶劣复杂的作业环境所带来的海底管道屈曲失效问题愈加严重。相较于长距离铺设厚壁管道在结构重量、铺设难度及维修成本等方面的弊端，沿海底管道长度方向间隔布置止屈器的方法优势明显。从20世纪80年代开始，各类止屈器就已经成为海底管道止屈措施研究的热点，但目前还处于理论探讨和室内试验阶段，没有投入实际应用。……