非线性波浪与柔性水面漂浮式光伏结构作用的数值模拟  

Numerical simulation of the interaction between nonlinear waves and flexible floating photovoltaic structures

作　　者：吴勇虎 于邦廷 梁爽 于广欣 李元芳 张一平 WU Yonghu;YU Bangting;LIANG Shuang;YU Guangxin;LI Yuanfang;ZHANG Yiping(CNOOC Research Institute Co.,Ltd.,Beijing 100028,China;State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]中海油研究总院有限责任公司,北京100028 [2]大连理工大学海岸和近海工程国家重点实验室,辽宁大连116024

出　　处：《海洋工程》2024年第5期1-9,共9页The Ocean Engineering

基　　金：中海石油(中国)有限公司科技课题“近海漂浮式光伏关键技术研究”资助项目(KJZX-2022-12-XNY-0602)。

摘　　要：大型水面漂浮式光伏系统具有水平面积大、垂向抗弯刚度低的特点,在外海波浪作用下,柔性光伏系统的水弹性运动响应较大。针对漂浮式柔性光伏结构的特点,建立了二阶非线性波浪与柔性漂浮式光伏耦合作用的频域数值模型,基于模态展开法实现结构运动与流体作用的解耦。其中,柔性漂浮式光伏结构的水弹性运动响应利用经典欧拉-伯努利梁振动方程模拟,流体域利用二维Rankine源及关于海底的镜像作为格林函数建立边界积分方程,采用高阶边界元方法求解。通过对比验证,建立的耦合模型具有较好的精度。利用该模型计算分析了不同波高和结构抗弯刚度时的结构运动响应,发现非线性波浪力引起的结构运动响应不可忽略。还研究了波浪周期和结构抗弯刚度对结构弹性变形的影响规律:波浪周期越大,结构的弹性变形越由低阶模态占主导,结构运动幅值分布越平缓;结构抗弯刚度越小,结构的弹性变形包含越多高阶模态成分,结构运动幅值分布波动越大。Large-scale floating photovoltaic systems on water surfaces have the characteristics of large horizontal area and low vertical flexural rigidity.Under the action of offshore waves,the hydroelastic motion response of the flexible floating photovoltaic system is relatively large.Considering the characteristics of the flexible floating photovoltaic structures,a second-order nonlinear wave-flexible floating photovoltaic coupled action frequency domain numerical model is established,and the decoupling of structural motion and fluid action is realized based on the modal expansion method.Among them,the hydroelastic motion response of the flexible floating photovoltaic structure is simulated using the classic Euler-Bernoulli beam vibration equation,and the fluid domain is established using the two-dimensional Rankine source and the mirror image about the seabed as the Green’s function to establish the boundary integral equation,and the high-order boundary element method is used to solve it.Through comparative verification,the coupled model established has good accuracy.Using this model,the structural motion response under different wave heights and structural flexural rigidity is calculated and analyzed,and it is found that the structural motion response caused by nonlinear wave forces cannot be ignored.The influence laws of wave period and structural flexural rigidity on the structural elastic deformation are also studied.The larger the wave period,the more the structural elastic deformation is dominated by the low-order mode,and the smoother the distribution of the structural motion amplitude.The smaller the structural flexural rigidity,the more high-order mode components are included in the structural elastic deformation,and the greater the fluctuation of the structural motion amplitude distribution.

关 键 词：非线性波浪 高阶边界元方法 弹性板 模态展开法 抗弯刚度 漂浮式光伏结构 

分 类 号：P752[天文地球—海洋科学] TM615[电气工程—电力系统及自动化]