多边界条件下海洋温差能冷水管动力响应分析  

Dynamics response analysis of a cold-water pipe for ocean thermal energy conversion under different boundary conditions

作　　者：张理 谭健[2] 张玉龙 徐进[2] 黄世苗 段青峰[2] 段梦兰[2] ZHANG Li;TAN Jian;ZHANG Yulong;XU Jin;HUANG Shimiao;DUAN Qingfeng;DUAN Menglan(Southern Marine Science and Engineering Guangdong Laboratory(Zhanjiang),Zhanjiang 524005,China;College of Safety and Ocean Engineering,China University of Petroleum-Beijing,Beijing 102249,China;Institute of Acoustics,Chinese Academy of Sciences,Beijing 100190,China)

机构地区：[1]南方海洋科学与工程广东省实验室(湛江),广东湛江524005 [2]中国石油大学(北京)安全与海洋工程学院,北京102249 [3]中国科学院声学研究所噪声与振动重点实验室,北京100190

出　　处：《振动与冲击》2023年第12期59-68,共10页Journal of Vibration and Shock

基　　金：南方海洋科学与工程广东省实验室(湛江)“温差能开发与深层海水综合利用关键技术研究”项目(ZJW-2019-05)。

摘　　要：深层冷海水提升过程中,超大流量会诱发冷水管振动和失稳。为了揭示冷海水提升过程的管道动力响应机理,基于Euler-Bernoulli梁模型,全面考虑管道所处海洋工况,建立动力响应计算分析模型,结合广义积分变换法,求解出多边界条件下振动方程的半解析解,给出了管道动力响应的时效解答。结果表明,结构阻尼仅减少在无外流下的管道振幅。内流流速对管道振幅的影响,在固支-自由边界条件下最大,在简支-加配重块边界条件下最小。但在外流作用下,内流流速仅对固支-加配重块边界条件的管道振幅影响显著。管道在不同边界条件下的固有频率和临界失稳流速不同。增大内流,管道在固支-固支和简支-简支的边界条件下的固有频率会逐渐减小直至为零。Large flow induces vibration and instability in pipes during conveying.To reveal the dynamic response of pipe conveying seawater,based on the Euler-Bernoulli beam model,a calculation and analysis model was established under marine condition.The semi-analytical solution of the vibration equation was solved by using Generalized Internal Transform Technique,and the time-dependent solution of structural dynamic response was given.Results show that structural damping only reduces the pipe amplitude in default of outflow.The effect of internal flow velocity on pipe amplitude is greatest under fixed-free boundary condition and least under pinned-with clump weight boundary condition.However,under the action of external flow,the internal flow velocity only influences the pipe amplitude under fixed-with clump weight boundary condition.The pipe has different natural frequency and critical velocity under different boundary conditions.With internal flow velocity increasing,the natural frequency of the pipe decreases gradually and approaches to zero.

关 键 词：海洋温差能 冷水管 广义积分变换法 固有频率 多边界条件 临界流速 

分 类 号：TH212[机械工程—机械制造及自动化] TH213.3