摘要
自升式桁架网箱凭借便于将养殖箱体下潜入水的结构特性,为更好地适应深远海养殖极端环境提供了一种选择.网衣作为桁架网箱关键部件,通过纲绳系缚于桁架管上,在外部环境载荷作用下可能会对网箱主体结构强度产生影响.针对一种自升式桁架网箱,基于SESAM/GeniE建立其有限元分析模型,分析了在有无网衣及不同网衣参数条件下的网箱主体结构响应.结果表明:网衣对网箱主体结构响应评估存在较大影响,尤其在流速较高时,网衣阻力大幅增加,直接影响网箱桩腿受力和桁架利用系数(Utilization factor,UF)值,证明在校核网箱主体结构强度时不可忽略网衣的作用;不同网目群化比下,网衣对自升式深海网箱整体结构响应评估结果影响不大,在网箱主体结构响应仿真计算中可以考虑使用较大的网衣群化比来提升计算效率;网衣系缚纲绳数量变化对网箱主体结构的响应评估基本无影响,但增加系缚纲绳可以有效减少纲绳受力.
Abstract
Jack-up truss net cage provides a choice for better responding to the extreme environment of deep-sea aquaculture due to its structural characteristics of easily submerging the breeding net cage into the water.As a key component of the breed-ing net cage,net has an impact on the strength of the main structure of the net cage under environmental loads.This paper fo-cuses on a jack-up truss net cage and establishes its finite element analysis model by using SESAM/GeniE to analyze the main structural response of net cage under the conditions of presence or absence of net and different net parameters.The results in-dicate that net has a significant impact on the evaluation of main structure response of net cage,especially under high current ve-locity conditions.Presence of net will increase the stress on the legs of net cage and utilization factor(UF)value of truss signifi-cantly,proving that the effect of net cannot be ignored when checking the strength of net cage's main structure.With different mesh grouping ratios,net has little effect on the evaluation result of jack-up truss net cage.In the simulation calculation of the main structure response of net cage,a larger mesh grouping ratio can be considered to improve the calculation efficiency.The change in the number of tie ropes for net has little effect on the evaluation of the main structure response of net cage,but adding more tie ropes can reduce the stress on tie points effectively.
基金项目
国家自然科学基金面上项目(32173024)
海南省自然科学基金(322QN438)
广州市科技计划基础与应用基础研究项目(2023A04J0258)
中央级公益性科研院所基本科研业务费专项中国水产科学研究院项目(2023TD97)
维普
万方数据