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Exploiting internal resonance to improve flow energy harvesting from vortex-induced vibrations
Journal of Intelligent Material Systems and Structures ( IF 2.7 ) Pub Date : 2021-08-11 , DOI: 10.1177/1045389x211023581
Wenan Jiang 1 , Ye Li 2 , Xindong Ma 1 , Yong Wang 3 , Liqun Chen 4 , Qinsheng Bi 1
Affiliation  

Vortex-induced vibrations have been recently employed to capture scalable flow energy harvesters, which can attain the maximum power when the wind speed is in the lock-in region where the vortex-shedding frequency is close to the structural frequency. Nevertheless, the dynamical mechanism of the synchronization phenomenon has not been reported. To solve this critical problem, in this paper we explore a novel internal resonance to scavenge flow energy from vortex-induced vibrations, the mechanism of synchronous oscillations is introduced by the amplitude-frequency relationship and confirmed by the energy function. To show the capturing performance, an electromagnetic energy harvester with one-to-one internal resonance is proposed. Based on the harmonic balance method, the electromechanical coupling equations are decoupled, and the first order approximate harmonic responses of displacement and current are established. The modulation equations are derived, the amplitude-frequency curves of displacement and current are plotted with different detuning parameters. The advantage of the proposed one-to-one internal resonance is compared to the noninternal resonance case, the results express that the internal resonance scheme can enhance flow energy capture. The effects of physical parameters on the scavenged power are discussed. The accuracy and efficiency of the approximate analytical results are checked by numerical simulations.



中文翻译:

利用内部共振改善涡激振动的流动能量收集

涡激振动最近已被用于捕获可扩展的流动能量收集器,当风速处于涡旋脱落频率接近结构频率的锁定区域时,它可以获得最大功率。然而,尚未报道同步现象的动力学机制。为了解决这个关键问题,在本文中,我们探索了一种新的内部共振以从涡激振动中清除流动能量,同步振荡的机制由幅频关系引入并由能量函数证实。为了显示捕获性能,提出了一种具有一对一内部谐振的电磁能量收集器。基于谐波平衡法,将机电耦合方程解耦,并建立位移和电流的一阶近似谐波响应。推导了调制方程,绘制了不同失谐参数下位移和电流的幅频曲线。所提出的一对一内部共振的优势与非内部共振情况相比,结果表明内部共振方案可以增强流动能量捕获。讨论了物理参数对扫气功率的影响。通过数值模拟检查近似分析结果的准确性和效率。所提出的一对一内部共振的优势与非内部共振情况相比,结果表明内部共振方案可以增强流动能量捕获。讨论了物理参数对扫气功率的影响。通过数值模拟检查近似分析结果的准确性和效率。所提出的一对一内部共振的优势与非内部共振情况相比,结果表明内部共振方案可以增强流动能量捕获。讨论了物理参数对扫气功率的影响。通过数值模拟检查近似分析结果的准确性和效率。

更新日期:2021-08-11
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