| Spar平台垂荡-纵摇耦合运动失稳机理 |
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| 引用本文： | 刘利琴,唐友刚,王文杰.Spar平台垂荡-纵摇耦合运动失稳机理[J].海洋工程,2009,27(2):29-35. |
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| 作者姓名： | 刘利琴 唐友刚 王文杰 |
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| 作者单位： | 天津大学建筑工程学院船舶与海洋工程系,天津,300072 |
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| 基金项目： | 国家高技术研究发展计划(863计划)，国家自然科学基金重点项目，国家自然科学基金 |
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| 摘 要： | 研究参数激励和强迫激励共同作用下Spar平台垂荡-纵摇耦合运动的失稳机理.考虑静稳性和排水体积的变化,推导平台的垂荡回复力和纵摇回复力矩表达式,建立规则波浪中平台垂荡-纵摇耦合的运动方程.以经典Spar平台为例,分析平台垂荡-纵摇耦合运动发生马休类型不稳定运动的条件以及平台运动失稳的形式,给出波高和波浪周期平面上平台因大幅运动失稳的参数域.结果表明,当波高相对较小时,波浪的临界周期接近于垂荡固有周期,平台失稳的形式为马休失稳;当波高相对较大时,波浪的临界周期远离垂荡固有周期,平台由于大幅摇摆运动而失稳.
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| 关 键 词： | Spar平台 垂荡-纵摇耦合运动 马休不稳性 内共振 失稳机理 |
| 收稿时间： | 2008/6/16 0:00:00 |
| 修稿时间： | 2008/12/10 0:00:00 |
Instability mechanism of coupled heave pitch motion s for Spar platform |
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| SONG Zhi-yao,NI Zhi-hui and LV Guo-nian.Instability mechanism of coupled heave pitch motion s for Spar platform[J].Ocean Engineering,2009,27(2):29-35. |
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| Authors: | SONG Zhi-yao NI Zhi-hui and LV Guo-nian |
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| Institution: | Department of Naval Architecture and Ocean Engineering;Tianjin University;Tianjin 300072;China |
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| Abstract: | The instability mechanism of coupled heave-pitch motions for Spar platform under both parametric excitation and forced excitation is studied.Considering the static stability and the change of the displacement volume,the formulas of heave restoring force and the pitch restoring moment are derived and the equations of the coupled heave-pitch motions are established in the regular waves.Taking a classic spar platform as an example,the occurrence condition for the Mathieu unstable motion and the instability for... |
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| Keywords: | Spar platform coupled heave-pitch motions Mathieu instability internal resonance instability mechanism |
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