Spar平台垂荡-纵摇与月池内流体垂向振动的耦合运动研究  

Coupling motions among vertical vibration of fluid inside a moonpool and heave-pitch of a spar platform

作　　者：刘利琴[1] 邱雨[1] 张永恒[1] 唐友刚[1] 

机构地区：[1]天津大学水利工程仿真与安全国家重点实验室,天津300072

出　　处：《振动与冲击》2016年第19期113-118,131,共7页Journal of Vibration and Shock

基　　金：国家自然科学基金(51179125)

摘　　要：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。Coupling vibrations among heave-pitch of a truss Spar platform and vertical vibration of fluid inside a moonpool were studied considering semi-opening of the moon-pool. The coupled motion equations for the heave-pitch of the Spar platform and the vertical vibration of fluid inside the moon pool were established, and the forces and moments generated by fluid inside the moon-pool to the heave and pitch of the platform were deduced, respectively. Three cases were considered, they were the 0% opening ratio, the 30% opening ratio and the 70% opening ratio of the moon pool. The motion responses of the coupled system were calculated numerically and the influences of fluid inside the moon-pool on the heave and pitch motions of the platform were analyzed. It was shown that the fluid in the moon-pool reduces the heave motions of the platform, and the level of reduction is related to the opening ratio of the moon-pool; for the 70% opening rate, a smaller peak occurs in the RAO curve of the heave response 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 response of the platform changes slightly when the semi-opening of the moon pool is considered. The effects of coupling parameters on the motions of the platform and the motions of fluid inside the moon pool were analyzed as last.

关 键 词：SPAR平台 半开口月池 垂荡-纵摇耦合 耦合参数分析 

分 类 号：P751[交通运输工程—港口、海岸及近海工程] TB123[天文地球—海洋科学]