圆柱斜切体涡激振动压电俘能器的输出特性研究.

With the wide application of micro-electromechanical systems and the increasing shortage of energy, it is an urgent problem to continuously and stably supply energy for micro-electromechanical systems. A novel chamfer cylinder vortex-induced vibration piezoelectric energy harvester was proposed, for broadening the working bandwidth and improving the output performance. The models of vortexinduced vibration piezoelectric energy harvester with diagonal tangent cylinder of 30°, 45° and 60° and smooth cylinder were established, and were verified by wind tunnel experiments. The output voltage and output power of vortex-induced vibration piezoelectric energy harvester with chamfer cylinder of 30°, 45° and 60° and smooth cylinder at optimal load resistance and various airflow velocities were investigated. Results show that when the optimal load is 0. 5 MΩ and wind speed ranges from 1. 413 m/ s to 3. 164 m/ s, output voltage and output power of piezoelectric energy harvester with diagonal tangent cylinder first increase and then decrease with the increase of the airflow velocity. A maximum output voltage of 4. 274 V and output power of 0. 037 mW can be obtained at the chamfer angle of 30° and airflow velocity of 3. 057 m/ s. The working bandwidth and the harvesting performance of the chamfer cylinder vortex-induced vibration piezoelectric energy harvester is improved over smooth cylinder. The output power of the piezoelectric energy harvester with the chamfer angle of 30° is 106% higher than that of smooth cylinder. This work provides a new method for designing more efficient piezoelectric energy harvester. [ABSTRACT FROM AUTHOR]