压电悬臂梁采收振动能发电能力分析与仿真

Analysis and simulation of power generation capacity of piezoelectric cantilever harvesting vibration energy

采收环境能量为无线网络传感器供能是近年来研究的热点,环境振动能量采收作为一种有效可行的方法,已成为其中的一个研究和发展方向,但目前该方法还没有形成一套完整的理论和设计方法。设计一种用于采收环境低频振动能的压电悬臂梁装置,研究了其结构对输出电压的影响与发电能力,在加速度2m/s2、频率64Hz振动条件下,利用ANSYS进行了仿真。研究结果表明,该压电悬臂梁发电装置能输出86μW的功率,可以满足无线网络传感器工作的需要,为采收环境中低频振动能量,实现网络传感器自供能装置设计提供了一种方法和相应的理论依据。

Energy harvesting to supply the power sources of sensors in wireless networks is a focus over recent years.Serving as an effective and feasible method,the harvesting of ambient vibration energy has become one of the research and development directions,but this method has not yet formed a complete set of theory and design methods.In the pa-per,a piezoelectric cantilever device for harvesting the ambient low-frequency vibration energy is designed,and influ-ences of its structure on output voltage and power generation capacity are studied also.On condition that the accelera-tion being 2m/s2 and the vibration frequency being 64Hz,ANSYS simulation is used to conduct simulation.The study results show that the piezoelectric cantilever can produce 86μW power energy which meets the operation requirements of sensors in wireless networks.It provides a method and corresponding theoretical basis for the harvesting of ambient low-frequency vibration energy and the design of self-supply devices for sensors in wireless networks.