三边型兆瓦级波浪能装置锚泊系统动力特性分析

DYNAMIC ANALYSIS OF MOORING SYSTEM OF TRILATERAL TYPE MEGAWATT WAVE ENERGY DEVICE

采用ANSYS-AQWA软件建立三边型兆瓦级波浪能装置及其锚泊系统分析模型,计算正常完整状态和锚泊线断裂1根状态下装置和锚链的动力特性,分析聚酯缆绳的刚度、环境入射角及平台锚链的出链长度对锚泊系统的最小安全系数的影响。结果表明:锚泊系统的最大张力受聚酯缆绳动态刚度的影响显著;当采用锚泊线初始构成方案时,对于部分环境入射角,锚泊系统的最小安全系数不满足规范要求,但通过调整平台锚链的出链长度,使得在正常完整状态和有1根锚泊线断裂状态下均满足相应规范要求。最后,根据计算分析对工程上的布置设计提出建议,从而在保证锚泊系统可靠性的同时提高整体工程的经济性。

The analysis model of the trilateral type megawatt wave energy converter(MWEC)and its mooring system was established by using the ANSYS-AQWA software.The dynamic characteristics of the MWEC and mooring lines were calculated under normal intact state and one of mooring lines broken state,and the effects of the stiffness of polyester rope,environmental incident angle,and the length of platform chain on the minimum safety factor of the mooring system were analyzed.The numerical results show that the maximum tension of mooring system is significantly affected by the dynamic stiffness of the polyester rope.When the initial composition of mooring line is adopted,the minimum safety factor of the mooring system does not meet the requirements of the API RP 2SK code for some environmental incident angles.However,by adjusting the length of the platform chain,it can meet the requirements of the API RP 2SK code both in the normal intact state and in the broken state of one anchor line.Finally,according to the calculation and analysis,some suggestions are put forward for engineering design,so as to ensure the reliability of the mooring system and improve the economy of the whole project.