Coupling Response of Heave and Moonpool Water Motion of A Truss Spar Platform in Random Waves  

作　　者：刘利琴 周晗 唐友刚 

机构地区：[1]State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University

出　　处：《China Ocean Engineering》2015年第2期169-182,共14页中国海洋工程（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Grant No.51179125);the Innovation Foundation of Tianjin University(Grant No.1301)

摘　　要：This paper presents the heave responses and the moonpool water motions of a truss Spar platform with semi-closed moonpool in random waves. A 2-DOF（degree of freedom） coupling dynamical equations of the platform heave and vertical motions of the moonpool water are derived. The linear wave theory is used to simulate the random waves. The response statistical values and the power spectrums are calculated to analyze the mutual influences between the platform heave and the moonpool water motions for different opening ratios of the moonpool. The effect of coupling parameters on the platform heave and the moonpool water motions are analyzed. The results show that motions of the moonpool water significantly affected the platform heave when the characteristic wave period is far away from the natural period of the platform heave, and different moonpool opening ratios lead to different heave amplitudes of the platform. In the actual design, an optimized moonpool opening ratio can be designed to reduce heave motions of the platform.This paper presents the heave responses and the moonpool water motions of a truss Spar platform with semi-closed moonpool in random waves. A 2-DOF（degree of freedom） coupling dynamical equations of the platform heave and vertical motions of the moonpool water are derived. The linear wave theory is used to simulate the random waves. The response statistical values and the power spectrums are calculated to analyze the mutual influences between the platform heave and the moonpool water motions for different opening ratios of the moonpool. The effect of coupling parameters on the platform heave and the moonpool water motions are analyzed. The results show that motions of the moonpool water significantly affected the platform heave when the characteristic wave period is far away from the natural period of the platform heave, and different moonpool opening ratios lead to different heave amplitudes of the platform. In the actual design, an optimized moonpool opening ratio can be designed to reduce heave motions of the platform.

关 键 词：truss Spar platform heave moonpool water coupling random waves power spectrum 

分 类 号：P751[交通运输工程—港口、海岸及近海工程]