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大部分波能装置是通过载体的振动吸收波浪能,双圆柱形浮体是其中一类波能装置,研究双浮体波能装置的振动特性对于设计及提高波能装置整体转换效率具有重要的指导作用.本文把双浮体波能装置物理问题简化为具有黏性阻尼二自由度的受迫振动系统,采用线性波理论和特征函数展开匹配法求解了波浪引起的激励力、附加质量和阻尼系数,基于振荡浮体的双自由度运动方程推导了波能装置的响应和转换效率表达式,并给出了优化原则.数值分析表明阻尼优化曲线有一波峰部分同弹簧无关,峰值的大小和对应的频率只同工况有关;当弹簧存在时,优化曲线呈现双峰值,双峰值对应的频率宽度随弹性系数的增大而变窄;低频段峰值对应阻尼较小,相对响应较大,高频段优化峰值对应相当大的阻尼,相对响应较小,几乎小于入射波波幅.
The majority of wave energy devices absorb wave energy through the vibration of the carrier, and the double-cylinder floating wave device is one of the wave energy devices. Studying the vibration characteristics of the dual floating wave energy devices plays an important guiding role in designing and improving the overall conversion efficiency of wave energy devices In this paper, the physical problem of the double buoyant wave energy device is simplified to a forced vibration system with viscous damping and two degrees of freedom. The linear wave theory and the eigenfunction expansion method are used to solve the wave induced excitation force, added mass and damping coefficient. The equation of two-degree-of-freedom motion of the oscillating floating body deduces the response and conversion efficiency of the wave energy device, and gives the principle of optimization. The numerical analysis shows that the peak of the damping curve has nothing to do with the spring, and the peak value and the corresponding frequency are the same When the spring is in existence, the optimization curve is bimodal, and the frequency width corresponding to bimodal width is narrower with the increase of elastic modulus. The damping value corresponding to the low frequency band is smaller and the relative response is larger, and the peak value corresponding to the high frequency band is correspondingly equivalent Large damping, the relative response is small, almost less than the incident wave amplitude.