基于阻尼控制的不同底部形状振荡浮子俘能效果对比

Comparison of energy capture efficiency of oscillating buoys of different bottom shapes based on resistive control

为优化振荡浮子式波浪能装置的能量俘获效果,针对圆柱形浮子底部的形状对装置俘能的影响展开研究,选取主流的平底、圆锥底和半球底进行计算对比。首先,建立浮子运动的频域模型;然后,通过ANSYS-AQWA对3种浮子进行水动力计算,得到3种浮子的附加质量、辐射阻尼、波浪激励力、幅值响应算子等水动力参数,对结果进行比较;最后,在频域运动模型中加入阻尼控制,研究在波浪激励下不同底部形状浮子的能量俘获效果,结果表明,阻尼控制可以明显提高浮子的能量俘获效率,半球底浮子在波浪谱较宽的工况下能量俘获效果更好,而平底浮子更适合谱峰频率在其固有频率附近且波浪谱较窄的工况。

To optimize the energy capture efficiency of the oscillating buoy wave energy converter,the effect of the bottom shape of the cylindrical buoy on the energy capture is studied.The commonly used oscillating buoys with the flat bottom,the cone bottom,and the hemispheric bottom are selected for comparison.Firstly,the frequency-domain model of the buoy motion is established.Then,the hydrodynamic parameters of these three buoy types,such as the added mass,the radiation damping,the wave excitation force,and the response amplitude operator,are calculated by ANSYS-AQWA software and compared.Finally,the resistive control is put into the frequency-domain motion model to investigate the energy capture efficiency of the buoys of different bottom shapes under the wave excitation.The results show that the resistive control could significantly improve the energy capture efficiency of the buoys.The hemispherical bottom buoy has a higher energy capture efficiency under wider wave spectrum conditions,while the flat bottom buoy is more suitable when the wave spectrum peak frequency is close to its natural frequency and the wave spectrum is narrow.