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DEVELOPMENT OF PREDICTION METHOD FOR BEHAVIOR OF TOTAL SYSTEM INCLUDING FLOATING BODY-RISER-MOORING LINE INTERACTION

包括浮体-立管-系泊绳相互作用在内的整个系统行为预测方法的开发

基本信息

批准号：
04555102
负责人：
MAEDA Hisaaki
金额：
$ 11.65万
依托单位：
University of Tokyo, Institute of Industrial Science
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1994
项目状态：
已结题

项目摘要

In order to investigate the behavior of a moored floating body with flexible riser pipes under natural environment conditions such as wave, wind and current, it is necessary to take account of interaction among a floating body, mooring lines and riser pipes. This interaction reveals nonlinearity which means that responses of motions of afloating body internal forces of riser pipes and tension of mooring lines are all non Gaussian even though wave, wind and current are Gaussian. Therefore in order to predict extreme values of above mentioned responses, we have to develop the computer code in time domain which should be validated by the corresponding experiments.At first , the authors developed the computer code for nonlinear dynamics of moored floating structure with flexible riser pipes in time domain which take into account the interaction between a moored floating body and riser pipes.Secondly they completed the CFD code for hydrodynamics on 2D circular section in separated oscillating flow in time domain.Thirdly they developed the computer code for riser pipe dynamics which is connected with the CFD code.At last, with regard to the validation for the above mentioned computer codes, they developed the optical apparatus for measuring 3D behavior of flexible riser pipes. They wade clear the characteristics of the chaotic phenomena of the behavior of the bottom end of the flexible riser pipes.Finally they established the practical analysis method for dynamics of a floating body and riser pipes which consider interaction effect between a floating body and riser pipes, and also which take account of only the drag force on a riser pipe section in which Keulegan carpenter number varies. However the computation diverges when not only drag force, but also lift force are considered at the some time. This subject is the important one solved in future.

为了研究具有柔性立管的系泊浮体在波浪、风、流等自然环境条件下的行为，需要考虑浮体、系缆索和立管之间的相互作用。这种相互作用表现出非线性，即在波浪、风和水流均为高斯型的情况下，浮体运动、立管内力和系缆张力的响应均为非高斯型。因此，为了预测上述响应的极值，我们必须开发相应的计算机程序，并通过相应的实验进行验证。首先，作者开发了考虑系泊浮体与立管相互作用的柔性立管系泊浮体非线性动力学时域程序。其次，完成了二维圆形截面分离振荡流中流体动力学的CFD程序。第三，开发了与CFD程序连接的立管动力学程序。最后，针对上述程序的验证，他们开发了用于测量柔性立管3D行为的光学设备。最后，建立了浮体和立管动力学的实用分析方法，该方法考虑了浮体与立管之间的相互作用，并且只考虑了木质数变化的立管管段上的阻力。然而，当同时考虑阻力和升力时，计算结果会出现偏差。这是今后要解决的重要课题。