双浮体波能装置的功率转换特性研究

Study on power conversion features of the two-buoy wave energy device

双浮体波能装置属于漂浮振荡浮子式技术的一种形式,研究其功率转换特性对于波能装置的发展具有重要意义。基于线性波理论和粘性阻尼理论,建立了装置的双自由度受迫振动方程,并以波能装置的外部阻尼作为优化变量,推导了最佳阻尼条件下波能装置吸收的最大功率表达式;采用HydroStar计算功率表达式中的附加质量、阻尼系数和波浪激励力,进一步求解出波能装置所吸收的功率和俘获宽度比,文中还结合实际海况分析了双浮体的主要几何参数变化对波能装置功率转换特性的影响。

Two-buoy wave energy device is a form of oscillating float technology, and it is of great significance to study the power conversion characteristics for development of wave energy devices. This paper established the device＇ s dual-degree of freedom iorced vibration equations based on linear wave theory and viscous damping theory, and expression of optimal absorbed power of the device was deduced under condition of the optimum damping. Added masses coefficients, damping coefficients and wave excitation force were calculated by using HydroStar software, then, absorbed power and capture width ratio were obtained. The paper also analyzed effects on power absorption characteristics with the change of geometry parameters of two-buoy wave energy device in actual sea conditions.