Spar平台垂荡-纵摇与月池内流体垂向振动的耦合运动研究

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振动与冲击 ›› 2016, Vol. 35 ›› Issue (19) : 113-118.

论文

刘利琴，邱雨，张永恒，唐友刚

作者信息 +

Study on the coupling motions of heave, pitch and vertical vibration of water inside the moonpool of Spar platform

LIU Li-qin , QIU Yu, ZHANG Yong-heng, TANG You-gang

Author information +

文章历史 +

摘要

本文考虑半开口月池，研究桁架式Spar平台垂荡、纵摇、月池内流体垂向振动的耦合运动。建立了平台垂荡-纵摇-月池内流体垂向振动的耦合运动方程，推导了月池内流体对平台垂荡和纵摇运动产生的力和力矩。针对三种工况，即不考虑月池开口、月池开孔率为30%和70%，数值计算了耦合系统的运动响应，分析了月池内流体对平台垂荡和纵摇运动的影响，结果表明，月池内流体对平台主体垂荡有抑制作用，且抑制程度与月池开孔面积有关；对于70%的开孔率，平台垂荡响应RAO曲线在月池流体垂向振动固有周期附近出现高频峰值；70%开孔率时，月池内流体的运动远大于30%开孔率的情况；考虑月池开口后，平台的纵摇响应变化较小。最后，分析了耦合参数对平台及月池内流体运动的影响。

Abstract

The coupling vibration of the heave, pitch, and the vertical motions of the fluid in the moon pool of a truss Spar platform was studied considering the semi-opening moon pool. The coupling motion equations of the heave, pitch and the vertical vibration of the fluid in the moon pool were established, and the forces and moments generated by the fluid in the moon pool to the heave and pitch of the platform were deduced, respectively. Three cases were considered, that were the 0% opening ratio, the 30% opening ratio and the 70% opening ratio of the moon pool. The motion responses of coupling system were calculated and the influence of fluid in the moon pool to the heave and pitch motions of the platform was analyzed. It is shown that the fluid in the moon pool will reduce the heave motions of the platform, and the degree of reduction relates to the opening ratio of the moon pool. For the 70%opening rate, a smaller peak occurs in the RAO curve of the heave of the platform nearby the natural vibration period of vertical motion direction of the fluid in the moon pool. For the opening rate of 70%, the movement of fluid in the moon pool is much larger than that for the 30% opening ratio. The pitch of the platform is changed slightly when the semi-opening moon pool is considered. The effect of coupling parameters on the motions of platform and motions of water inside the moon pool was analyzed as last.

导出引用

刘利琴，邱雨，张永恒，唐友刚. Spar平台垂荡-纵摇与月池内流体垂向振动的耦合运动研究[J]. 振动与冲击, 2016, 35(19): 113-118

LIU Li-qin,QIU Yu, ZHANG Yong-heng, TANG You-gang. Study on the coupling motions of heave, pitch and vertical vibration of water inside the moonpool of Spar platform[J]. Journal of Vibration and Shock, 2016, 35(19): 113-118

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