亥姆霍兹共振式声电换能系统研究

Acousto-electric transducer structures based on the Helmholtz resonance effect

为了利用环境噪声进行发电,提出了一种基于亥姆霍兹共振效应的声电换能系统。声电换能结构将亥姆霍兹共振效应与压电效应相结合,采用多个亥姆霍兹共鸣器串联共振吸声,驱动压电陶瓷变形发电,通过信号转换与能量收集电路将电能存储。利用COMSOL软件的声固耦合模块、静电模块研究了声电换能结构的声学性能与电学性能。仿真结果表明,在亥姆霍兹共振频率附近传递损失最高可达10.47 dB,同时系统产生的电能也最大。试验结果表明,当声电换能结构工作于共振频率365 Hz时,产生的电压最大值为20 V,声电换能结构发电功率为3 mW,平均功率密度为13.58μW/cm^(3),能量转化效率为42.01%。该声电换能系统在噪声控制的同时实现了声电能量的转换与储存。

In order to utilize the environmental noise to generate electricity,an acoustic-electric transducer system based on the Helmholtz resonance effect was proposed.The acousto-electric energy conversion structure combines the Helmholtz resonance effect with piezoelectric effect,adopts multiple Helmholtz resonators series to absorb sound and resonate,drive piezoelectric ceramics to deform and generate electricity,and store electrical energy through signal conversion and energy harvesting circuits.The acoustic and electrical properties of the acoustic-electric transducer structure were studied by using the acoustic-structure coupling module and electrostatic module of the COMSOL software.The simulation results show that near the Helmholtz resonance frequency,the transmission loss can be as high as 10.47 dB and the electrical energy generated by the system is also the largest.The experimental results show that when the acoustic-electric transducer structure works at a resonance frequency of 365 Hz,the maximum voltage generated is 20 V,the power generated by the acoustic-electric transducer structure is 3 mW,the average power density is 13.58μW/cm^(3),and the energy conversion efficiency is 42.01%.The acoustic-electric energy conversion system realizes the conversion and storage of acoustic-electric energy while controlling noise.