钢悬链线立管全尺寸共振弯曲疲劳试验系统与模态分析  

A full-scale resonant bending test system and modal analysis of steel catenary risers

作　　者：徐泽鑫 安晨[1] 谢智 张吉祥 林方坚 XU Zexin;AN Chen;XIE Zhi;ZHANG Jixiang;LIM Frank(College of Safety and Ocean Engineering,China University of Petroleum-Beijing,Beijing 102249,China;Ocean Engineering Departament,Instituto Alberto Luiz Coimbra de Pós-Gradua o e Pesquisa em Engenharia,Universidade Federal do Rio de Janeiro,Rio de Janeiro 21941-972,Brazil;2H Offshore Engineering Ltd.,London GU216HJ,United Kingdom)

机构地区：[1]中国石油大学(北京)安全与海洋工程学院,北京102249 [2]里约热内卢联邦大学阿尔韦托·路易斯·科英布拉工程研究学院海洋工程系,里约热内卢21941-972 [3]2H海洋工程有限公司,伦敦GU216HJ

出　　处：《振动与冲击》2024年第20期119-127,共9页Journal of Vibration and Shock

基　　金：国家自然科学基金(51879271);国家工信部项目(CJ09N20);国家留学基金(202306440017)。

摘　　要：钢悬链线立管(steel catenary riser,SCR)作为支撑海上平台和其他关键设备的重要组成部分,在极端的海洋环境中长时间服役运行时,其结构完整性和安全性至关重要。为确保SCR立管在恶劣环境下的安全运行,对立管进行共振弯曲疲劳试验研究成为必要的评估标准,同时也为后续立管疲劳寿命预测和失效分析提供基础。针对两种特定型号的SCR立管,推导并求解不同约束条件下的共振系统的固有频率与振型函数,分析管道长度、管道壁厚、偏心块和配重块质量对共振系统固有频率的影响;在此基础上开展不同特定工况下的全尺寸共振弯曲疲劳试验,同时对SCR立管在全尺寸共振弯曲疲劳试验系统中不同跨距及内压的振动响应特性进行了模拟。结合理论分析、有限元计算和共振弯曲疲劳试验结果,发现管道长度和两端的配重约束是影响共振系统1阶固有频率的重要参数,特别是在管道长度较短和壁厚较薄的情况下,影响更为显著。此外,注水加压和跨距增加会降低共振系统的固有频率,支撑跨距越短,系统的固有频率越大。分析所得结果为SCR立管的共振弯曲疲劳试验系统结构设计和试验方案优化提供了重要的参考依据。Steel catenary risers(SCRs)serve as essential components for supporting offshore platforms and other crucial equipment.Ensuring the structural integrity and safety of SCRs are paramount during prolonged operations in extreme marine environments.Conducting resonant bending fatigue tests on the risers has emerged as a requisite evaluation standard to guarantee their safe operation under harsh conditions,and it also forms the basis for subsequent predictions of fatigue life and analysis of failures.This study focused on deriving and solving the natural frequency and mode functions of the resonance system under different constraint conditions for two specific types of SCRs,and analyzed the effects of pipeline length,pipeline wall thickness,eccentric block and counterweight mass on the natural frequency of the resonance system.Subsequently,full-scale resonant bending fatigue tests were conducted under different specific operating conditions,and the vibration response characteristics of the SCRs with different spans and internal pressures in the full-scale resonant bending fatigue test system were simulated.The integration of theoretical analysis,finite element calculations and results from resonant fatigue tests reveal that the pipeline length and the counterweight constraints at both ends are critical parameters affecting the first-order natural frequency of the resonance system,especially the impact is particularly pronounced when the pipe length is short and the wall thickness is thin.Additionally,internal pressure and an increasing span will decrease the natural frequency of the resonance system,and a shorter support span will result in a higher natural frequency of the system.These analytical results provide an important reference basis for the structural design and optimization of the test plan of the resonant bending fatigue test system of SCR.

关 键 词：钢悬链线立管(SCR) 共振弯曲 疲劳试验 固有频率 全尺寸 模态特性 

分 类 号：TE951[石油与天然气工程—石油机械设备] TH113[机械工程—机械设计及理论]