海洋工程装备与技术

海洋工程装备与技术 ›› 2023, Vol. 10 ›› Issue (2): 112-118.

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深水钢悬链线立管波致疲劳预报时频方法对比

黄俊1, 康庄2, 张岩松3, 艾尚茂4   

  1. 1. 中海油研究总院，北京，100000 2. 哈尔滨工程大学，哈尔滨，150001

  • 出版日期:2023-07-02 发布日期:2023-07-02

Time-frequency Method Comparison for Wave-induced Fatigue Prediction of Deepwater SCRs

HUANG Jun1, KANG Zhuang2, ZHANG Yansong3, AI Shangmao4   

  1. 1. Cnooc Research Institute, Beijing, 100000 2. Harbin Engineering University, Harbin, 150001

  • Online:2023-07-02 Published:2023-07-02

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摘要： 波致疲劳损伤是深水钢悬链线立管（SCR）疲劳损伤的重要组成部分。分别采用时域和频域的方法对中国南海海域风暴海况引起的SCR波致疲劳损伤进行了预报，分析了时域方法和频域方法得到的平台运动响应和立管动力响应的差异，对疲劳损伤风险位置及损伤极值等预报结果进行了对比，结果表明：时域方法与频域方法计算耗时差距巨大，采用频域方法得到的损伤风险位置滞后，且与时域方法相比，对立管的波致疲劳损伤进行了放大，在数量级上保持一致。通过上述结果分析，评估两种方法在深水钢悬链线立管波致疲劳预报中的适用性。

关键词: 钢悬链线立管, 波致疲劳, 频域谱分析, 时域方法

Abstract: Wave-induced fatigue damage is an important component of deep-water steel catenary riser (SCR) fatigue damage. In this paper, the fatigue damage caused by SCR wave in the South China Sea caused by storm state is predicted through time domain and frequency domain respectively. The difference of platform motion response and riser dynamic response obtained by time domain method and frequency domain method is also analyzed. The prediction results of fatigue damage risk position and damage extreme value are then compared. The applicability of the methods in prediction of deep-ocean risers’ wave-induced fatigue was evaluated. The result show that there is a huge gap between the time domain method and the frequency domain method, and that the damage risk position calculated by the frequency domain method is lagging behind. With the frequency domain method, the wave-induced fatigue cumulative damage is amplified, while the order of magnitude is consistent.

Key words:

SCRs, Wave-induced fatigue, Frequency domain spectral analysis, Time domain method