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Title:: Nonlinear Random Motion Analysis of Coupled Heave-Pitch Motions of a Spar Platform Considering 1st-Order and 2nd-Order Wave Loads

Author(s):: Shuxiao Liu¹; 2; Yougang Tang¹; 2; Wei Li¹; 2

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Keywords:: spar platform; coupled heave-pitch; random waves; 2nd-order wave loads; transient wave elevation; time domain analysis

DOI:: 10.1007/s11804-016-1349-7

Abstract:: In this study, the coupled heave-pitch motion equations of a spar platform were established by considering 1st-order and 2nd-order random wave loads and the effects of time-varying displacement volume and transient wave elevation. We generated random wave loads based on frequency-domain wave load transfer functions and the Joint North Sea Wave Project (JONSWAP) wave spectrum, designed program codes to solve the motion equations, and then simulated the coupled heave-pitch motion responses of the platform in the time domain. We then calculated and compared the motion responses in different sea conditions and separately investigated the effects of 2nd-order random wave loads and transient wave elevation. The results show that the coupled heave-pitch motion responses of the platform are primarily dominated by wave height and the characteristic wave period, the latter of which has a greater impact. 2nd-order mean wave loads mainly affect the average heave value. The platform’s pitch increases after the 2nd-order low frequency wave loads are taken into account. The platform’s heave is underestimated if the transient wave elevation term in the motion equations is neglected.

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Journal of Marine Science and Application[ISSN:1002-2848/CN:61-1400/f]

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