基于非完美声学黑洞的压电能量收集系统

Piezoelectric Energy Harvesting System Based on Imperfect Acoustic Black Hole

针对高频压电振动能量回收效率低的缺点,提出了一种基于非完美声学黑洞的压电阵列式能量收集系统。首先建立了非完美声学黑洞薄板结构模型,并分析了在时域和频域条件下能量聚集特性,非完美声学黑洞结构能量集聚于中心平台的多个位置。然后建立了阵列式压电俘能系统实验模型,结构中心平台上能量聚集点的输出电压存在较大的相位差,通过引入整流电路消除此相位差,对比分析了整流前后串、并联电路的输出电压,结果表明,整流后系统输出电压能力得到了较大提高。

A piezoelectric array energy harvesting system based on imperfect acoustic black holes is proposed to solve the problem of low energy recovery efficiency of high frequency piezoelectric vibration.The thin plate structure model of the imperfect acoustic black hole is established,and the energy accumulation characteristics in time domain and frequency domain are analyzed.The energy of the imperfect acoustic black hole structure is concentrated at several positions of the central platform.The experimental model of the piezoelectric array energy harvesting system is established.The output voltage of the energy gathering point on the central platform of the structure has a large phase difference,which is eliminated by introducing a rectifier circuit.The output voltage of the series and parallel circuits before and after rectification is compared and analyzed.The results show that the output voltage capability of the system has been greatly improved after rectification.