一种多浮体铰接式波浪能装置的运动分析与俘获特性研究

基于线性势流理论,利用总模态法对多浮体铰接波浪能装置“海星号”在波浪中的运动开展水动力学系数计算;然后基于矢量力学建立多浮体刚体运动学方程,并结合几何约束条件开展动态响应计算,获得最优俘获效率和最优负载阻尼;最后比较并分析“海星”波浪能装置的多浮体俘获效率,获得“海星”多浮体做功的俘获特性。研究表明：“海星”波浪能装置的多浮体四向迎波设计可拓宽装置最优俘获频带宽度,提高装置整体俘获效率;正向迎波与背向迎波俘获波浪能方式相比,小周期情况下,正向吸波浮体俘获效率较高,随着周期增大,正向吸波浮体俘获效率开始降低,背向吸波浮体俘获效率开始增大,极大周期情况下,正向吸波浮体和背向吸波浮体俘获效率趋于一致且趋近于零。

STUDY ON MOTION RESPONSE AND POWER CAPTURE CHARACTERISTICS OF HINGED MULTIPLE FLOATING BODIES WAVE ENERGY CONVERTER

Based on the linear potential flow theory, the hydrodynamic coefficients of the multi-floating hinged wave energy convertor “Starfish” are calculated by using the total mode method. Then, the kinematic equation of multi-floating rigid body was established based on vector mechanics, and the dynamic response is calculated based on geometric constraints to obtain the optimal capture efficiency and the optimal load damping. Finally, the capture efficiency of the multi-floating body of the Starfish wave energy device is compared and analyzed. The results show that the design of starfish wave energy device with multiple floating bodies can broaden the optimal capture bandwidth and improve the capture efficiency of the device. Compared with the way to capture wave energy by the forward and backward waves, in the case of small period, the capture efficiency of forward-facing absorbing wave body is relatively higher. With the increase of period, the capture efficiency of forward-facing absorbing wave body starts to decrease, and the capture efficiency of back-facing absorbing wave body starts to increase. In the case of maximum period, the capture efficiency of forward-facing absorbing wave body and back-facing absorbing wave body tend to be consistent and close to zero.