Whipping Response of Vessels With Large Amplitude Motions
Whipping Response of Vessels With Large Amplitude Motions
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DOI：
10.1115/omae2006-92412
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
N. Fonseca;Eduardo Antunes;C. Soares
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文献类型：
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作者：
N. Fonseca;Eduardo Antunes;C. Soares
本文提出了一种计算船舶在恶劣天气中响应的时域方法，包括由于鞭梢引起的整体结构载荷。由于大幅值波浪引起非线性船舶响应，特别是高度非线性的垂直结构载荷，运动方程和结构载荷在时域中求解。“部分非线性”时域耐波性程序解释了最重要的非线性效应。砰击力由两个分量的贡献给出：由底部砰击引起的初始冲击和由附加质量的动量变化引起的张开砰击。采用模态分析和时域微分方程直接积分相结合的方法计算了船体的振动响应。船体的结构动力学特性的建模由一个有限元表示的剪切变形和旋转惯性的Reynshenko梁。计算过程适用于护卫舰在规则波中前进。通过比较有和没有船体振动的响应，评估了鞭梢载荷对船舶结构上垂直弯矩的贡献。
The paper presents a time domain method to calculate the ship responses in heavy weather, including the global structural loads due to whipping. Since large amplitude waves induce nonlinear ship responses, and in particular highly nonlinear vertical structural loads, the equations of motions and structural loads are solved in the time domain. The “partially nonlinear” time domain seakeeping program accounts for the most important nonlinear effects. Slamming forces are given by the contribution of two components: an initial impact due to bottom slamming and flare slamming due to the variation of momentum of the added mass. The hull vibratory response is calculated applying the modal analysis together with direct integration of the differential equations in the time domain. The structural dynamic characteristics of the hull are modeled by a finite element representation of a Timoshenko beam accounting for the shear deformation and rotary inertia. The calculation procedure is applied to a frigate advancing in regular waves. The contribution of whipping loads to the vertical bending moments on the ship structure is assessed by comparing this response with and without the hull vibration.Copyright © 2006 by ASME