Numerical study of a point absorber wave energy converter with tuned variable inerter
Numerical study of a point absorber wave energy converter with tuned variable inerter
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DOI：
10.1016/j.oceaneng.2022.111696
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发表时间：
2022-08
影响因子：
5
通讯作者：
Y. Nemoto;Minoru Takino;Shota Tsukamoto;Takehiko Asai
中科院分区：
文献类型：
--
作者：
Y. Nemoto;Minoru Takino;Shota Tsukamoto;Takehiko Asai
介绍了一种新型点吸收式可调变惯性波能转换器。最初，调谐惯性器（TI），包括一个调谐弹簧，一个惯性器，和一个阻尼器元件，被引入到土木工程领域作为一个控制装置的结构受到地震荷载。此外，一个点吸收器WEC配备TI，其中一个电机是用于阻尼元件，已被提出，其有效性已被证明。然而，由于TI机制利用惯性器的共振来吸收来自振动浮标的能量，已经指出TI不能很好地响应海洋波浪的主周期变化。因此，为了进一步改进，开发了控制惯性器的系统，因为有效周期由调谐弹簧刚度和惯性器确定。在该系统中，主波周期的计算是由快速傅立叶变换波的振幅和惯性和电机电流相应地调整。WEC-Sim的数值结果表明，所提出的TVI系统对波浪周期的变化有适当的响应，并且比TI系统更好。
This paper introduces a novel point absorber wave energy converter (WEC) with tuned variable inerter (TVI). Originally, the tuned inerter (TI), consisting of a tuning spring, an inerter, and a dashpot element, was introduced in the field of civil engineering as a control device for structures subjected to seismic loadings. Moreover, a point absorber WEC equipped with TI, in which a motor is used for the dashpot element, has been proposed and its effectiveness has been shown. However, since the TI mechanism takes advantage of the resonance of the inerter to absorb energy from vibrating buoys, it has been pointed out that the TI could not respond well to the dominant period changes of ocean waves. Thus, for further improvement, a system to control the inerter is developed because the effective period is determined by the tuning spring stiffness and the inerter. In this system, the dominant wave period is calculated by the Fast Fourier Transform using the wave amplitude and the inerter and the motor current are adjusted accordingly. Numerical results obtained from the WEC-Sim showed that the proposed TVI system responded appropriately to the wave period changes and works better than the TI system.