暴风多发区域中炮塔系泊FPSO偏航运动

M. Naciri, Murthy Chitrapu
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引用次数: 0

摘要

西非系泊系统的设计经常受到暴风事件的影响。这些都是风速迅速增加的片段,伴随着突然和显著的风向变化。风向标系统(停泊在出口系统上的卸载油轮或转塔系泊FPSO)对这种瞬变和剧烈环境的响应非常复杂,是一个正在进行的联合行业项目的主题。在风向标单元对飑风事件的数值模拟中,一个重要的参数是偏航运动阻尼模型。稳定环境条件下的偏航阻尼有大量的参考文献和见解,但由于事件的瞬态性质及其复杂性,当涉及到飑时,几乎没有任何参考文献和见解。本文介绍了安哥拉海上一艘炮塔系泊装置的偏航运动的现场测量,并同时进行了船上的风测量。这两个量每隔1分钟采样一次。每天的前后吃水时间序列也可用。这些测量跨越了10年。根据世界气象组织的定义,对风速时间序列进行了系统扫描,以确定所有经过该资产的飑事件。介绍了该型舰塔系泊FPSO的主要特点,以及其站位保持系统和相关的水平慢漂移运动响应时间尺度。对测量到的偏航运动和速度进行了系统的分析,寻求与风暴事件发生时船体载荷状况、风暴发生前的航向以及风暴最大速度和方向范围的关系。这些分析的主要目的是提供事实信息,这些信息可用于确定用于暴风易发地区系泊分析的偏航阻尼模型。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Turret-Moored FPSO Yaw Motions in a Squall-Prone Region
The design of mooring systems in West of Africa is often dominated by squall events. These are episodes of rapidly increasing wind speeds accompanied with sudden and significant wind direction changes. The response of weathervaning systems (offloading tankers moored to an export system or turret moored FPSO’s) to such transient and violent environments is very complex and the subject of an on-going joint industry project. One important parameter in numerical simulations of weathervaning units to squall events is the yaw motion damping model. There is quite a large body of references and insights in yaw damping under steady environmental conditions but hardly any when it comes to responses in squall owing to the transient nature of the event and to its complexity. Field measurements of the yaw motions of a turret moored unit offshore Angola with concurrent on-board wind measurements are presented. Both quantities are sampled at 1-minute intervals. Time series of aft and fore drafts are also available on a daily basis. These measurements span one decade. A systematic scan of the wind speed time series has been performed to identify, based on the World Meteorological Organization definition, all squall events passing through the asset. The main particulars of the turret-moored FPSO are described along with its station-keeping system and the associated horizontal slow drift motion response time scales. Systematic analysis of measured yaw motions and velocities has been performed seeking correlations with the hull loading condition at the time of the squall event, its heading prior to the squall and the squall maximum speed and direction range. The main objective of these analyses is to provide factual information that can be used to firm up the yaw damping models used for mooring analyses in squall-prone areas.
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