多节漂浮式波能转换装置浮体运动及功率响应

以多节漂浮式波浪能发电装置为研究对象，基于线性波理论和波-体耦合作用分析，利用刚体动力学方程方法，建立圆柱型波能捕获浮筒在波浪中的垂荡-纵荡-纵摇三自由度非线性耦合运动方程.结合中国黄渤海波浪特点，采用频域分析方法，探讨浮筒纵摇运动特性和功率响应.结果显示，浮筒纵摇运动特性主要受浮筒的固有振动频率和浮筒长度的影响；浮筒长度、PTO液压阻尼系数及弹簧劲度系数等因素不会影响浮筒的共振频率，半径和吃水则影响显著，这些因素均对功率响应具有复杂的影响.选择合适的浮筒半径、吃水、弹簧劲度系数等是提高装置的波能转换功率和对中国近海海域适应性的有效途径.
Taking the multi-section floating-type wave energy converter (WEC) as the study object, the three-degree-of-freedom nonlinear coupled equations of the pitching-surging-heaving motions for the cylindrical wave capture buoy were formulated based on the linear wave theory and wave-body coupled interaction by using rigid body kinematics. Then the pitching motion characteristics and power responses were analyzed by means of frequency-domain in the China Yellow Sea and Bohai Sea. Results show that the main factors which affect the pitching motion are the natural vibration frequency and the length of buoy. The length of buoy, hydraulic damper and spring stiffness coefficient can not affect the resonant frequencies, but the influences of radius and draft are obvious. All above those factors contribute to complex changes of the power responses. The adjustments of suitable radius, draft and spring stiffness coefficient are the effective ways to improve the transfer power and adaptability to China offshore sea area.