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《Engineering Mechanics》 2012-10
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MATHIEU INSTABLITY STUDY OF A DEEPWATER SEMI-SUBMERSIBLE PLATFORM

WANG Jun-rong1,2,XIE Bin1(1.CNOOC Research Institute,Beijing 100027,China;2.Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China)  
The heave response of a semi-submersible platform is relatively significant than other floaters.While a certain ratio of heave natural period and pitch/roll natural period is reached,the pitch/roll motions of the platform will fall into a Mathieu instability zone.In the paper,a damped Mathieu equation for the semi-submersible platform was derived and the formulae of the control parameters were obtained to determine the stability of its pith/roll motion according to the parameter diagram of Mathieu instability or via numerical simulations.A semi-submersible platform was analyzed to investigate the Mathieu instability conditions.Furthermore,engineering measures on avoiding possible Mathieu instability are proposed and they may be some references for the design of semi-submersible platforms.
【Fund】: 国家高技术研究发展计划(863)课题项目(2006AA09A103)
【CateGory Index】: U674.941
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