Abstract This paper introduces a hybrid ocean wave-current energy converter (HWCEC) that harvests energy from ocean waves and current simultaneously with a single power takeoff. The wave energy is extracted through relative heaving motion between a floating buoy and a submerged second body, while the current energy is extracted using a marine current turbine. Energy from both sources is integrated by a hybrid power takeoff whose concept is based on a mechanical motion rectifier. The hybrid power takeoff with two one-way clutches converts bidirectional, up-and-down motion from the waves into unidirectional rotation of the generator. Meanwhile a third one-way clutch couples the turbine with the same generator. The wave and current can simultaneously or separately drive the same generator through different engagement and disengagement statuses of the one-way clutches. Time-domain simulation is conducted with hydrodynamic coefficients obtained from computational fluid dynamics analysis and the boundary element method. Tank tests were conducted for an HWCEC under a co-existing wave and current inputs. For comparison, separate baseline tests of a turbine and a two-body point absorber, each acting in isolation, are conducted. Experimental results validate the dynamic modeling and show that an HWCEC can increase the output power with a range between 24 and 89% over either current turbine and wave energy converter acting individually, and it can reduce by up to 70% the peak-to-average power ratio compared with the wave energy converter on the tested conditions.

中文翻译：

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具有单取力器的混合海浪流能量转换器的性能分析和水槽试验验证

摘要 本文介绍了一种混合海浪-海流能量转换器（HWCEC），它通过单次取力器同时从海浪和海流中获取能量。波浪能是通过浮标和水下第二体之间的相对升沉运动提取的，而海流能量是使用海流涡轮机提取的。来自两种来源的能量通过混合动力输出整合，其概念基于机械运动整流器。带有两个单向离合器的混合动力输出将波浪的双向上下运动转换为发电机的单向旋转。同时，第三个单向离合器将涡轮机与同一台发电机连接起来。通过单向离合器的不同接合和分离状态，波和电流可以同时或分别驱动同一台发电机。使用从计算流体动力学分析和边界元方法获得的流体动力学系数进行时域模拟。在共存的波浪和电流输入下对 HWCEC 进行了水槽测试。为了进行比较，分别对涡轮机和二体点吸收器进行了单独的基线测试，它们各自独立地起作用。实验结果验证了动态建模，并表明 HWCEC 可以将输出功率提高 24% 到 89%，而不是单独作用的当前涡轮机和波浪能转换器，