| 水下系泊监测平台非线性振动稳定性分析 |
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| 引用本文： | 何孔德,李友荣,方子帆,杨蔚华.水下系泊监测平台非线性振动稳定性分析[J].海洋工程,2012,30(3):119-124. |
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| 作者姓名： | 何孔德 李友荣 方子帆 杨蔚华 |
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| 作者单位： | 武汉科技大学 冶金装备及其控制教育部重点实验室;三峡大学机械与材料学院 |
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| 基金项目： | 湖北省自然科学基金资助项目(2010CDB10804) |
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| 摘 要： | 针对水下系泊监测平台在水流涡激作用下的稳定性问题,考虑了浮体在振动过程中的变形,建立了其流固耦合的非线性动力学方程,利用谐波平衡法进行了非线性特性定性分析,Melnikov方法进行稳定性判据研究及影响因素分析,以系统出现混沌状态为稳定性控制条件,重点研究了系泊缆支撑间距对稳定性的影响,并计算出支撑间距的临界值。结果表明,系统稳定性随支撑间距增加而降低,当支撑间距超过临界值后,稍微增加都可能导致系泊监测平台振动偏离振动轨道而造成局部失稳甚至结构破坏。为保证监测平台的稳定性,应增加支撑数量,且支撑的间距不能超过系统发生失稳的临界值。
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| 关 键 词： | 系泊监测平台 稳定性 水下 谐波平衡法 Melnikov方法 |
Stability analysis of nonlinear vibration for submerged mooring monitoring platforms |
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| HE Kong-de,LI You-rong,FANG Zi-fan,YANG Wei-hua.Stability analysis of nonlinear vibration for submerged mooring monitoring platforms[J].Ocean Engineering,2012,30(3):119-124. |
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| Authors: | HE Kong-de LI You-rong FANG Zi-fan YANG Wei-hua |
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| Institution: | 1,2(1.The Key Laboratory for Metallurgical Equipment and Control of the Ministry of Education,Wuhan University of Science and Technology,Wuhan 430081,China;2.Mechanic and Material College,China Three Gorges University,Yichang 443002,China) |
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| Abstract: | Aiming at the problem of stability by flow vertex-induced action for submerged mooring monitoring platform,the fluid-solid coupling nonlinear dynamic equation is set up by taking into account the deformation of floating body under vibration.Nonlinear characteristic qualitative analysis is made by using harmonic wave equilibrium method and the stability criteria and influencing factors are studied by adopting Melnikov method.The influence of mooring cable support distance on stability is analysed and the critical value of support distance is calculated.The results show that the stability of system will decrease along with the increase of support distance.After the support distance passes the critical value,a little increase will make the mooring platform’s vibration deviate the vibration track,cause local instability and even damage the structure.In order to ensure the stability of mooring platform,the number of support should increase,and the support distance should not pass the critical value which will make the system instable. |
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| Keywords: | mooring monitoring platform stability submerged harmonic wave equilibrium method Melnikov method |
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