Abstract: In order to study the performance of the internal piezoelectric cantilever device, the free vibration attenuation experiment of the piezoelectric cantilever was carried out to determine the main parameters such as natural frequency, effective stiffness and electromechanical coefficients. The variation law of the natural frequency, damping, output voltage and power changing with the load resistance was obtained, and the optimum resistance of the piezoelectric cantilever beam to output the maximum power was determined. Then the FIV energy harvesting experiment was carried out in the wind tunnel. The results show that the vibration frequency of the external cylinder almost keeps stable within the experimental wind speed, whereas the amplitude increases as the wind speed increases; with the excitation of the external cylinder, the internal piezoelectric cantilever beam is forced to vibrate, and its output voltage and power increase as the wind speed increases. With the increase of wind speed, the vibration frequency of the cylinder changes little and the amplitude increases.

Key words: electromechanical engineering, flow induced vibration, internal piezoelectricity cantilever, energy harvesting

摘要： 为了研究内置式压电能量收集装置的性能，首先对压电悬臂梁在不同负载电阻下进行自由振动衰减实验，确定压电悬臂梁的主要集总参数如固有频率、等 效刚度、机电耦合系数等，得到了压电悬臂梁固有频率、阻尼、输出电压及功率随负载电阻变化的规律，确定了压电悬臂梁输出最大功率的最佳电阻。之后在风 洞中进行了流致振动能量收集实验，研究结果表明：在实验风速范围内，外圆筒的振动频率基本保持稳定，而振幅随着风速的增加而增大；在外部圆筒的激励下 ，内置的压电悬臂梁做受迫振动，其输出电压和功率随风速增加而增大随着风速的提高，圆筒的振动频率变化较小，振幅随之增大。

关键词: 机电工程, 流致振动, 内置压电悬臂梁, 能量收集