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中文摘要：
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。
英文摘要：
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.
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