Stochastic Analysis of Nonlinear Coupled Heave-Pitch Motion for the Truss Spar Platform

Wenjun Shen; Yougang Tang

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Stochastic Analysis of Nonlinear Coupled Heave-Pitch Motion for the Truss Spar Platform

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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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《船舶与海洋工程学报（英文版）》 |2011年第4期|471-477|共7页
作者
Wenjun Shen; Yougang Tang;
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Key Laboratory of Harbor & Ocean Engineering Ministry of Education, School of Civil Engineerin, Tianjin University, Tianjin 300072, China;

Key Laboratory of Harbor & Ocean Engineering Ministry of Education, School of Civil Engineerin, Tianjin University, Tianjin 300072, China;

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Stochastic Analysis of Nonlinear Coupled Heave-Pitch Motion for the Truss Spar Platform

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