In this work, we studied the impact of the buoy geometry on power absorption of a point absorber consisting of a cylindrical buoy. The displacement volume of the buoy is fixed while the radius to draft ratio is adopted to completely define the buoy geometry. A motion constraint that prevents the buoy from jumping out of or being submerged by the water is applied so that the absorbed power is restrained at a reasonable range. The maximum power absorption ability under reactive control has been attained, and the most appropriate buoy geometry has been identified. Passive control is also investigated to find the possible condition where it can be used as an alternative to active control. Results show that the maximum absorbed power approaches the Budal limit at low wave frequencies, and gradually departs from this limit with the increasing wave frequency. The most attractive radius to draft ratio, which shows more absorbed power and wider bandwidth, is around 1.0 and decreases with the increasing wave amplitude. At high wave frequencies, the absorbed power is identically affected by the motion constraint for both passive and reactive control, hence passive control may be an alternative to reactive control in this condition due to simpler implementation.

在这项工作中，我们研究了浮标几何形状对由圆柱形浮标组成的点吸收器的功率吸收的影响。浮标的位移量是固定的，同时采用半径与吃水比完全定义了浮标的几何形状。施加防止浮标跳出水面或被水淹没的运动约束，从而将吸收的功率限制在合理的范围内。已经获得了无功控制下的最大功率吸收能力，并且确定了最合适的浮标几何形状。还研究了被动控制，以找到可能用作主动控制的替代方法的条件。结果表明，在低波频率下，最大吸收功率接近Budal极限，并随着波频率的增加逐渐偏离此极限。最吸引人的半径与吃水比显示出更多的吸收功率和更宽的带宽，大约为1.0，并且随着波幅的增加而减小。在高波频率下，无源和无功控制的运动约束都会同样地吸收吸收的功率，因此，由于实施较为简单，因此在这种情况下，无源控制可以替代无功控制。