| Truss Spar平台非线性垂荡-纵摇耦合随机运动分析(英文) |
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| 引用本文： | 沈文君,唐友刚.Truss Spar平台非线性垂荡-纵摇耦合随机运动分析(英文)[J].船舶与海洋工程学报,2011,10(4):471-477. |
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| 作者姓名： | 沈文君 唐友刚 |
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| 作者单位： | Key Laboratory of Harbor & Ocean Engineering Ministry of Education, School of Civil Engineerin, Tianjin University |
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| 基金项目： | Supported by the National Natural Science Foundation of China(No. 51079097, 50879057) |
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| 摘 要： | Considering the static stability and the change of the displacement volume, including the influences of higher order nonlinear terms and the instantaneous wave surface, the nonlinear coupled heave-pitch motion was established in stochastic waves. The responses of heave-pitch coupling motion for the Truss Spar platform were investigated. It was found that, when the characteristic frequency of a stochastic wave is close to the natural heave frequency, the large amplitude pitch motion is induced under the parametric-forced excitation, which is called the Mathieu instability. It was observed that the heave mode energy is transferred to pitch mode when the heave motion amplitude exceeds a certain extent. In addition, the probability of internal resonant heave-pitch motion is greatly reduced while the characteristic wave frequency is away from the natural heave frequency.
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| 关 键 词： | Truss Spar platform heave-pitch nonlinear coupling stochastic waves parametric-forced excitation Mathieu instability |
| 收稿时间： | 28 May 2010 |
Stochastic analysis of nonlinear coupled heave-pitch motion for the Truss Spar platform |
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| Wenjun Shen,Yougang Tang.Stochastic analysis of nonlinear coupled heave-pitch motion for the Truss Spar platform[J].Journal of Marine Science and Application,2011,10(4):471-477. |
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| Authors: | Wenjun Shen Yougang Tang |
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| Institution: | (1) Department of Marine Technology, Centre for Ships and Ocean Structures, Norwegian University of Science and Technology, Trondheim, Norway |
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| Abstract: | Considering the static stability and the change of the displacement volume, including the influences of higher order nonlinear
terms and the instantaneous wave surface, the nonlinear coupled heave-pitch motion was established in stochastic waves. The
responses of heave-pitch coupling motion for the Truss Spar platform were investigated. It was found that, when the characteristic
frequency of a stochastic wave is close to the natural heave frequency, the large amplitude pitch motion is induced under
the parametric-forced excitation, which is called the Mathieu instability. It was observed that the heave mode energy is transferred
to pitch mode when the heave motion amplitude exceeds a certain extent. In addition, the probability of internal resonant
heave-pitch motion is greatly reduced while the characteristic wave frequency is away from the natural heave frequency. |
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