Li Xia, Li Zhiyuan, Liu Qiang, Shan Xiaobiao
School of Mechanical and Power Engineering, Zhengzhou University, Zhengzhou 450001, China.
State Key Laboratory of Robotics and System, Harbin Institute of Technology, Harbin 150001, China.
Micromachines (Basel). 2019 Dec 1;10(12):842. doi: 10.3390/mi10120842.
In order to solve the problem of continuous and stable power supply for vehicle sensors, a resonant cavity piezoelectric energy harvester driven by driving wind pressure was designed. The harvester has an effective working range of wind speed. According to the energy conservation law, the cut-in (initial) wind speed of the harvester was solved. The pressure distribution law of the elastic beam in the flow field was studied by the Fluent software package, and the results were loaded into a finite element model with a method of partition loading. The relationship between the wind speed and the maximum principal stress of the piezoelectric cantilever beam was analyzed, and the critical stress method was used to study the cut-out wind speed of the energy harvester. The results show that the cut-in wind speed of the piezoelectric energy harvester is 5.29 m/s, and the cut-out wind speed is 24 m/s. Finally, an experiment on the power generation performance of the energy harvester was carried out. The experimental results show that the cut-in and cut-out wind speeds of the piezoelectric energy harvester are 5 m/s and 24 m/s, respectively, and the best matching load is 60 kΩ. The average output power, generated by the harvester when the driving wind speed is 22 m/s, is 0.145 mW, and the corresponding power density is 1.2 mW/cm.
为解决车辆传感器持续稳定供电问题，设计了一种由驱动风压驱动的谐振腔压电能量采集器。该采集器具有有效的风速工作范围。依据能量守恒定律，求解了采集器的切入（初始）风速。利用Fluent软件包研究了弹性梁在流场中的压力分布规律，并采用分区加载方法将结果加载到有限元模型中。分析了风速与压电悬臂梁最大主应力之间的关系，采用临界应力法研究了能量采集器的切出风速。结果表明，压电能量采集器的切入风速为5.29 m/s，切出风速为24 m/s。最后，对能量采集器的发电性能进行了实验。实验结果表明，压电能量采集器的切入和切出风速分别为5 m/s和24 m/s，最佳匹配负载为60 kΩ。驱动风速为22 m/s时，采集器的平均输出功率为0.145 mW，相应的功率密度为1.2 mW/cm。
