海底电缆在涡激振动下的疲劳寿命  

Fatigue Life of Submarine Cables Under Vortex-Induced Vibration

作　　者：程志 洪爱军 梁毅 董红 罗楚军[2] CHENG Zhi;HONG Aijun;LIANG Yi;DONG Hong;LUO Chujun(Guangzhou Power Supply Bureau,Guangdong Power Grid Co.,Ltd.,Guangzhou 510620,Guangdong,China;Central Southern China Electric Power Design Institute Co.,Ltd.,China Power Engineering Consulting Group,Wuhan 430071,Hubei,China)

机构地区：[1]广东电网有限责任公司广州供电局,广东广州510620 [2]中国电力工程顾问集团中南电力设计院,湖北武汉430071

出　　处：《中国海洋平台》2023年第6期58-67,共10页China offshore Platform

基　　金：广东电网公司规划专题项目(编号:030100QQ00210009)。

摘　　要：针对悬空段海底电缆结构失稳、疲劳失效和使用寿命缩短等问题,基于洋流作用下海底电缆涡激振动机理,结合海底电缆结构特性,采用流体力学法建立适用于海底电缆的振动仿真模型,基于仿真模型研究洋流流速、电缆机械特性(截面、质量、自阻尼特性等)、悬空断长度等对海底电缆振动和疲劳损伤的影响,结合应变性疲劳曲线和雨流计数法,计算海底电缆的疲劳损伤,根据线性损伤累积理论得到海底电缆的疲劳寿命,分析海底电缆疲劳寿命的影响因素。结果表明,增大海底电缆的弹性模量和阻尼比、缩短电缆悬空段长度可有效延长海底电缆的疲劳寿命。Aiming at the problems such as structural instability,fatigue failure and shortened service life of the submarine cable suspension section,based on the Vortex-Induced Vibration(VIV)mechanism of the submarine cable under the ocean current and combined with the structural characteristics of submarine cable,a vibration simulation model suitable for the submarine cable is established by the hydrodynamic method.Based on the simulation model,the effects of the current velocity,cable mechanical properties(cross section,quality,self damping characteristics,etc.),suspension section length on cable vibration and fatigue damage are studied.Combined the modified fatigue curve and rain flow count method,the fatigue damage of the submarine cable is calculated.According to the linear damage accumulation theory,the fatigue life of the submarine cable is gotten.The influence factors of the fatigue life of the submarine cable are analyzed.The results show that increasing the elastic modulus and damping ratio of the submarine cable and shortening the cable suspension section length can effectively extend the fatigue life of the submarine cable.

关 键 词：海底电缆 涡激振动 疲劳寿命 VIVANA 

分 类 号：P756[天文地球—海洋科学]