摘要： 为了探究半潜式网箱在波浪作用下的力学性能，针对该网箱构件的外径进行参数敏感性分析，采用边界元方法建立了一种半潜式网箱的水动力数值计算模型，在验证模型准确性后，引入有限元方法计算了网箱的应力分布。随后基于拉丁超立方抽样法抽取样本方案并计算了各个设计参数的Speraman系数，依据该系数对各设计参数的敏感性进行了整体分析。随后进一步单独分析了参数的敏感性，给出了这些参数在结构优化时的推荐取值范围。结果显示，半潜式网箱的各设计参数在其取值范围内与网箱最大应力呈负相关关系。其中：下支撑管外径的敏感性最高，而其他参数的敏感性较接近。上弧管和下弧管外径推荐的取值范围较大，分别为36cm~56cm和46cm~76cm；中弧管、斜管和细立柱外径推荐的取值范围较小，分别为23cm~28cm、38cm~40cm和50cm-60cm；下支撑管和上支撑管外径的取值不得低于70cm和50cm。研究结果可为半潜式网箱在波浪作用下的结构优化提供参考。

关键词: 半潜式网箱, 参数敏感性, 结构强度分析, 水动力数值计算

Abstract: In order to investigate the mechanical performance of semi-submersible net cages under wave action, a parameter sensitivity analysis was conducted on the outer diameter of the cage components. A numerical hydrodynamic model of the semi-submersible net cage was established using the boundary element method, and after validating the accuracy of the model, a finite element method was introduced to calculate the stress distribution of the net cage. Subsequently, based on the Latin hypercube sampling method, sample schemes were extracted, and the Spearman coefficient of each design parameter was calculated to comprehensively analyze the sensitivity of each design parameter. Further individual analysis of parameter sensitivity was conducted, and recommended ranges for these parameters during structural optimization were provided. The results showed that the design parameters of the semi-submersible net cage were negatively correlated with the maximum stress within their range of values. Specifically, the sensitivity of the outer diameter of the lower support pipe was the highest, while the sensitivity of other parameters was relatively close. The recommended ranges for the outer diameter of the upper and lower arch pipes were relatively large, ranging from 36 cm to 56 cm and from 46 cm to 76 cm, respectively. The recommended ranges for the outer diameter of the middle arch pipe, inclined pipe, and slender columns were relatively small, ranging from 23 cm to 28 cm, 38 cm to 40 cm, and 50 cm to 60 cm, respectively. The outer diameter of the lower support pipe and upper support pipe should not be less than 70 cm and 50 cm, respectively. The research results can provide reference for the structural optimization of semi-submersible net cages under wave action.

Key words: Semi-submersible cage, parameter sensitivity, structural strength analysis, Hydrodynamic Numerical Computation