Transient effects of tendon disconnection of a TLP by hull–tendon–riser coupled dynamic analysis
Transient effects of tendon disconnection of a TLP by hull–tendon–riser coupled dynamic analysis
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DOI：
10.1016/j.oceaneng.2010.01.005
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发表时间：
2010-06
影响因子：
5
通讯作者：
Chan K. Yang;Moo-Hyun Kim
中科院分区：
文献类型：
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作者：
Chan K. Yang;Moo-Hyun Kim
本文对墨西哥湾 (GoM) 恶劣环境条件下肌腱断裂对延伸张力腿平台 (ETLP) 整体性能的瞬态影响进行了数值研究。 ETLP 有 12 个筋束，其中包括 12 个生产顶张立管 (TTR) 和 1 个钻井立管。立管通过液压气动张紧器连接。开发了一种用于与立管/系泊线耦合的浮动船体的时域非线性全局运动分析程序，以模拟与顶部或底部腱断开相关的瞬态效应。一根或多根肌腱的突然断开会导致刚度和自然周期的变化，整个系统的力和力矩的不平衡，并且在断开时刻可能出现较大的瞬时张力超调。顶部的破损和底部的解锁也会对系统产生不同的影响。从系统鲁棒性的角度对瞬态响应和张力进行了比较和讨论。在非极端环境下，意外失去一根或两根肌腱的 TLP 的生存能力也可以通过这种时域模拟技术来检查。
This paper deals with a numerical study of the transient effect of tendon disconnection on global performance of an extended tension leg platform (ETLP) during harsh environmental conditions of Gulf of Mexico (GoM). The ETLP has twelve tendons with twelve production top-tensioned risers (TTRs) and one drilling riser. The risers are attached by hydro-pneumatic tensioners. A time-domain nonlinear global-motion-analysis program for floating hulls coupled with risers/mooring lines is developed to model the transient effects associated with tendon disconnection at the top or the bottom. The sudden disconnection of one or more tendons causes the change of stiffness and natural periods, the imbalance of forces and moments of the total system, and possibly large transient overshoots in tension at the moment of disconnection. The breakage at the top and the unlatch at the bottom also make different impacts on the system. The transient responses and tensions are compared and discussed in the viewpoint of the robustness of the system. The survivability of a TLP with the loss of one or two tendons by accident during a lesser-than-extreme environment can also be checked by this kind of time-domain simulation technique.