Renewable and sustainable energies exhibit promising performance while serving as the power supply of a wireless sensor especially located in marine waters. Various microgenerators have been developed to harvest wave energy. However, the conversion ability from a dynamic oscillating source of wave is crucial to enhance their effectiveness in practical applications. In this paper, a new piezoelectric converter system is proposed to harvest the kinetic energy from ocean waves. The vortex-induced effect in an air channel enhances the vibration performance, improving the energy harvesting efficiency. The system comprises an oscillating water column (OWC) air chamber, a bluff body, and a piezoelectric piece for electromechanical transduction. The fluid–solid–electric coupling finite element method was used to investigate the relation between the output voltage and geometrical parameters, including the size and position of the piezoelectric cantilever beam, which is based on the user-defined function of the ANSYS. It is found that the bluff body in the outlet channel above the air chamber induced high-frequency vortex shedding vibration. The regular wave rushed into the air chamber with a frequency of 0.285 Hz and extruded the air across the bluff body in the outlet channel. This incurred the fluctuation of the air pressure and excited the piezoelectric cantilever beam vibration with a high frequency of 233 Hz in the wake region. Furthermore, a continuous electrical output with a peak voltage of 6.11 V is generated, which has potential applications for the wireless sensors on the marine buoy.

中文翻译：

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通过涡激振动增强压电悬臂梁的性能，以收集海浪能量

可再生和可持续能源表现出令人鼓舞的性能，同时可以用作无线传感器的电源，尤其是位于海水中的无线传感器。已经开发出各种微型发电机来收集波能。但是，动态振荡波源的转换能力对于提高其在实际应用中的有效性至关重要。在本文中，提出了一种新的压电转换器系统，以从海浪中收集动能。空气通道中的涡流效应增强了振动性能，提高了能量收集效率。该系统包括一个振荡水柱（OWC）气室，一个钝体和一个用于机电转换的压电件。液固耦合耦合有限元方法用于研究输出电压与几何参数之间的关系，包括基于ANSYS用户定义功能的压电悬臂梁的尺寸和位置。发现气室上方出口通道中的阻流体引起高频涡旋脱落振动。规则波以0.285 Hz的频率冲入气室，并在出口通道中的阻流体上吹出空气。这引起了气压的波动，并且在唤醒区域中以233Hz的高频激发了压电悬臂梁的振动。此外，还会产生峰值电压为6.11 V的连续电输出，