An Investigation of Head-Sea Parametric Rolling and its Influence on Container Lashing Systems
An Investigation of Head-Sea Parametric Rolling and its Influence on Container Lashing Systems
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发表时间：
2003
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通讯作者：
William N. France;M. Levadou;T. Treakle;J. Paulling;R. Michel;C. Moore
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文献类型：
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作者：
William N. France;M. Levadou;T. Treakle;J. Paulling;R. Michel;C. Moore
最近的研究表明，当不利的调谐与低横摇阻尼（降低的速度）和大的稳定性变化（受波长、波高、一般船体形状、船头外展和船尾形状控制）相结合时，极端水头或近水头海中的参数横摇可能会发生。参数滚动是一种不稳定的现象，它会快速产生大的滚动角，并伴有显着的俯仰运动。横摇与纵摇同步发生，并且在集装箱船上会给集装箱及其固定系统带来高负载。看来后巴拿马型集装箱船可能特别容易出现这种行为。考虑到未来几年计划交付大量此类船舶，这是一个重要问题。 1998 年 10 月，一艘超巴拿马型 C11 级集装箱船遭遇极端天气，甲板装载集装箱遭受严重损失和损坏。通过一系列模型测试和数值分析，研究了此次风暴事件期间船舶的运动。这些研究深入了解超巴拿马型集装箱船可能会经历逆海参数横摇的情况，以及可能发生的运动和加速度的大小。本文介绍了这项调查的结果，并讨论了这种极端运动如何影响集装箱紧固系统的设计和应用。该文件还概述了需要进行额外研究的建议，以更好地了解船舶设计和操作考虑因素对后巴拿马型集装箱船参数滚动倾向的影响。
Recent studies have demonstrated that parametric roll in extreme head or near head seas can occur when unfavorable tuning is combined with low roll damping (reduced speed) and large stability variations (governed by wavelength, wave height, general hull form, bow flare, and stern shapes). Parametric rolling is an unstable phenomenon, which can quickly generate large roll angles that are coupled with significant pitch motions. The rolling occurs in phase with pitch, and on containership s introduces high loads into the containers and their securing systems. It appears that post-Panamax containerships may be particularly prone to this behavior. This is an important issue considering the large number of these vessels scheduled for delivery in the next few years. In October, 1998, a post-Panamax, C11 class containership encountered extreme weather and sustained extensive loss and damage to deck stowed containers. The motions of the vessel during this storm event were investigated through a series of model tests and numerical analyses. These studies provide insight into the conditions in which post-Panamax containerships are likely to experience head sea parametric rolling, and the magnitude of motions and accelerations that can occur. The findings from this investigation are presented in this paper, together with discussion of how such extreme motions impact the design and application of container securing systems. Also outlined in the paper are recommendations for additional research needed to better understand the influence of vessel design and operational considerations on the propensity of post-Panamax containerships towards parametric rolling.