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.
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. JOURNAL OF VIBRATION AND SHOCK, 2016, 35(19): 113-118.
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