基于NIAH的螺旋骨架复合柔性低温管道等效力学性能分析  

Equivalent mechanical properties of spiral skeleton composite flexible low-temperature pipeline based on NIAH

作　　者：英玺蓬 耿东岭 曹慧鑫 张凯仑 步宇峰 杨志勋 阎军[1] YING Xipeng;GENG Dongling;CAO Huixin;ZHANG Kailun;BU Yufeng;YANG Zhixun;YAN Jun(State Key Lab of Structural Analysis for Industrial Equipment,Dalian University of Technology,Dalian 116024,China;College of Mechanical and Electrical Engineering,Harbin Engineering University,Harbin 150001,China)

机构地区：[1]大连理工大学工业装备结构分析国家重点实验室,辽宁大连116024 [2]哈尔滨工程大学机电工程学院,哈尔滨150001

出　　处：《振动与冲击》2023年第13期10-16,共7页Journal of Vibration and Shock

基　　金：国家自然科学基金资助项目(U1906233,52001088);山东省重点研发计划(2019JZZY010801);工业装备结构分析国家重点实验室开发基金资助项目(GZ20105)。

摘　　要：FLNG(floating liquefied natural gas)是一种集LNG(液化天然气)的液化、存储、装卸为一体的新型海上浮式生产系统。螺旋骨架复合柔性低温管道是其中关键的核心配套装备,然而其结构形式复杂,各结构层之间存在着大量的接触、摩擦等非线性问题,使理论建模与数值分析求解较困难;针对螺旋骨架复合柔性低温管道的一维周期性特征,基于渐近均匀化理论新方法(novel implementation of asymptotic homogenization,NIAH),建立螺旋骨架复合柔性低温管道的微单胞模型并施加周期性边界条件,求解得到宏观结构的等效刚度参数。通过与精细有限元模型计算结果对比,发现其等效误差小于3.60%,计算成本缩减约32倍,验证了基于NIAH等效刚度计算的准确性与高效性;针对管道螺旋缠绕结构特征,提出双对称边界条件施加方法,其结果比传统的单对称边界条件减少了78.00%的误差;总结了不同周期性边界条件适用的结构特点,为螺旋骨架复合柔性低温管道的结构设计与分析提供可靠、快速的等效计算方法。Floating liquefied natural gas(FLNG)is a new offshore floating production system integrating liquefaction,storage and loading/unloading of LNG.Spiral skeleton composite flexible low-temperature pipeline is FLNG’s core supporting equipment.However,the pipeline’s structural form is complex,and there are a large number of nonlinear problems,such as,contact and friction among structural layers to make theoretical modeling and numerical analysis more difficult.Here,according to one-dimensional periodic characteristics of the pipeline,based on the new novel implementation of asymptotic homogenization(NIAH),the micro-cell model of the pipeline was established and periodic boundary conditions were exerted on the model for solving to obtain equivalent stiffness parameters of the corresponding macrostructure.Compared with the calculation results using the fine finite element model,the NIAH-based equivalent method’s calculated results showed that the equivalent error is within 3.60%and the calculation cost is reduced by about 32 times to verify the accuracy and efficiency of the NIAH-based equivalent method.In addition,according to the pipeline’s spiral wound structure characteristics,a method of applying double-symmetric boundary condition was proposed,and the calculated results showed that this method can reduce error by 78.00%compared with the traditional single symmetric boundary condition.Finally,structural characteristics applicable to different periodic boundary conditions were summarized.It was shown that the study results can provide a reliable and fast equivalent calculation method for structural design and analysis of spiral skeleton composite flexible low-temperature pipeline.

关 键 词：螺旋骨架复合柔性低温管道 渐近均匀化 双对称周期性边界条件 等效刚度计算 

分 类 号：O342[理学—固体力学]