轴力和水压作用下深水输液管道湿模态振动特性分析  

Wet modal vibration analysis for submarine fluid-conveying pipeline under axial tension and hydrostatic pressure

作　　者：余建星[1,2] 李振眠 余杨[1,2] 赵明仁 崔宇朋 赵宇[1,2] 徐立新[1,2] YU Jianxing;LI Zhenmian;YU Yang;ZHAO Mingren;CUI Yupeng;ZHAO Yu;XU Lixin(State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University,Tianjin 300350,China;Tianjin Key Laboratory of Port and Ocean Engineering,Tianjin University,Tianjin 300350,China)

机构地区：[1]天津大学天津大学水利工程仿真与安全国家重点实验室,天津300350 [2]天津大学天津市港口与海洋工程重点实验室,天津300350

出　　处：《振动与冲击》2021年第12期90-96,113,共8页Journal of Vibration and Shock

基　　金：国家自然科学基金(51779173);工信部项目(G18473CJ09)。

摘　　要：采用Love-Timoshenko理论和Helmholtz方程建立了轴力和水压作用下原油-管道-海水耦合模型,计算得到了深水输液管道壳振动周向模态的固有频率。通过文献对比,验证了该计算结果的准确性。通过不同工况管道固有频率对比,发现湿模态分析具有不可替代性,原油、海水的存在会降低管道壳振动固有频率,但不会影响管道弹性失稳的临界压力,原油恒定流速的影响可以忽略不计。通过耦合模型参数影响分析,发现边界条件和长径比对高周向模态频率影响较小,而对低周向模态频率影响较大,特别是基频。轴向拉力会小幅降低管道固有频率,进而小幅降低管道弹性失稳临界压力。水压会大幅降低管道固有频率,甚至引发结构失稳。因此,在深水输液管道湿模态周向振动特性分析中轴力和水压作用应加以重视。A coupled model of submarine pipeline conveying crude oil under axial tension and hydrostatic pressure was established based on the Love-Timoshenko theory and the Helmholtz equation and results of structural natural frequencies were obtained.Compared with those in literature,the results presented were confirmed to be correct.By comparing the natural frequencies under different working conditions,it was found that wet mode analysis is irreplaceable for submarine pipeline vibration analysis.The presence of crude oil and sea water will reduce the natural frequencies,but will not affect the elastic critical pressure.The influence of crude oil constant flow velocity can be ignored.Though parameters analysis,it is found that the boundary conditions and the length-radius ratio have less influence on high circumferential mode frequencies,but greater influence on low ones,especially the fundamental frequency.The axial tension will slightly reduce the natural frequency,and then slightly reduce the elastic critical pressure.Hydrostatic pressure can greatly reduce the natural frequency and even cause structural instability.Therefore,the axial force and hydrostatic pressure should be addressed in the wet mode analysis of submarine pipeline.

关 键 词：深水管道 声固耦合 湿模态分析 固有频率 初始应力 

分 类 号：P751[交通运输工程—港口、海岸及近海工程]