局部系泊失效下半潜式平台的动力响应特性

运用ANSYS/AQWA软件建立半潜式平台和锚泊系统的三维分析模型,研究平台主体的运动响应特性和系泊链张力响应特征,并对系泊链断裂前后2种状态下的平台动力响应特性进行对比分析。结果显示:当局部系泊链断裂后,系泊链最大张力最高增加18.07%,系泊链的可靠性最高降低了146.16倍;而平台的横摇角最大值增加了15.99%,横荡最远距离增大100%;系泊链3断裂时,平台的纵荡最远距离增大116%。因此,需要避免环境载荷迎面系泊链断裂的情况,一旦发生断裂,需要立即采取措施,以避免系泊系统发生连锁失效反应,同时采取适当措施降低平台横荡、纵荡和横摇的增加,从而保证平台和人员安全。

Dynamics analysis of Semi-submersible platform under Partial Mooring Failure

The dynamic response of the platform maybe changed because of the part mooring of Semi-submersible platform damaged in extreme sea conditions, it leads platform smooth performance and the ability of Mooring system to resist damage to change, thus affecting the security of the platform. In order to analyze the platform to maintain its own performance and mooring chain resistance to environmental load damage capacity, it is necessary to analyze the motion response characteristics of the platform under local mooring failure. First, establishing an analysis model by ansys/aqwa software. And then study he motion response characteristics of the platform body and the characteristics of the mooring cable tension under the environmental load of 240 ° direction. Finally, compared with the motion response characteristics of the platform under the two conditions. According to the results, when the single mooring chain breaks, the maximum tension of the mooring chain increases by 18.07%, and the reliability of the mooring chain is reduced by 146.16 times. And the range of motion amplitude of the platform is not changed, but the maximum value of the pitch increases by 15.99%, the maximum distance of sway increases by100%. when the mooring chain 3 is broken , the maximum distance of suger increases by 116%. Therefore, it is necessary to avoid the breakage of the mooring chain in the direction of the environmental load. Once a break is found, immediate action is required to avoid a chain failure response in the mooring system.