不同约束条件对深海采矿输送管道动力学的影响  

Effects of different constraints on the dynamics of pipeline in deep sea mining

作　　者：刘辉 邓旭辉[1,2] 赵珂 郭小刚 LIU Hui;DENG Xuhui;ZHAO Ke;GUO Xiaogang(College of Civil Engineering and Mechanics,Xiangtan University,411105 Xiangtan,China;State Key Laboratory of Exploitation and Utilization of Deep-Sea Mineral Resource,410012 Changsha,China)

机构地区：[1]湘潭大学土木工程与力学学院,湘潭411105 [2]深海矿产资源开发利用技术国家重点实验室,长沙410012

出　　处：《应用力学学报》2022年第3期506-515,共10页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金重点项目(No.5143002);湖南省教育厅重点实验室开放基金项目(No.18K028)。

摘　　要：针对深海采矿系统长距离垂直输送管道顶端不同约束条件对复杂流固耦合振动特性的影响,采用基于双向流固耦合的模态分析方法,重点研究了铰接约束和弹性约束对管道固有频率及振型的影响;结合模态分析结果以及管道外壁所受应力和变形情况,对弹性约束管道进行谐响应分析,并根据分析结果对结构进行了优化设计。研究表明:对比两种约束条件模态分析结果,弹性约束管道固有频率最大、振幅最小,且振型最为简单,实际工程中管道顶端选用弹性约束最合适;当激励频率处于第7阶固有频率附近时,管道的振动响应最为激烈;通过增焊强环圈的方法对输送管道进行优化,对比优化前后模态分析结果,证明了优化的可行性。In view of the influence of different constraints on vibration characteristics of transportation pipeline, the research mainly focuses on the effects of hinge and elastic constraints on the natural frequencies and modes of the pipeline by the bidirectional fluid structure interaction.With the results of modal analysis and the stress and deformation on the pipe outer wall, the harmonic response of elastic-constrained pipe is analyzed, and the structure is optimized according to the analysis results.The results show that the elastic constraint pipe has the largest natural frequency, the smallest amplitude, and the simplest vibration mode;therefore, it is the most suitable choice for the top of the pipe in the actual project.When the excitation frequency is close to the seventh-order natural frequency, the vibration response of pipeline is the most intense.The method of welding strong ring is used to optimize the pipeline, and the results of modal analysis before and after the optimization are compared, which proves the feasibility of the optimization.

关 键 词：输送管道 边界约束 固有频率 模态振型 谐响应分析 结构优化 

分 类 号：P742[天文地球—海洋科学]