一种可集成电磁式声能发电装置的设计

Design of Integrated Electromagnetic Acoustic Power Generation Device

为采用声电转换技术对环境噪声进行收集并加以利用,设计一种可集成电磁式声能发电装置。声能发电装置由声波导管、亥姆霍兹共振器和电磁换能器组成,声压在亥姆霍兹共振器中被放大,驱动换能器振膜振动,带动线圈做切割磁感线运动,实现声能—机械能—电能的转换。利用MATLAB软件对声电转换单元和声能发电装置的频响特性进行了分析,模拟结果表明装置具有明显的窄带特性,并且入射声压级和负载电阻对装置的输出特性有一定的影响。实验结果表明当入射声压级为120 dB,负载电阻为8Ω时,入射声波频率在装置共振频率350 Hz处,输出电功率峰值可以达到2.47 mW,平均功率密度为4.99μW/cm^(3)。

In order to collect and utilize environmental noise by using acoustic-electric conversion technology,an integrated electromagnetic acoustic power generation device was designed.The acoustic power generation device is composed of acoustic duct,Helmholtz resonator and electromagnetic transducer.The sound pressure is amplified in the Helmholtz resonator to drive the vibration of the transducer diaphragm,drive the coil to cut the magnetic induction line,and realize the conversion of acoustic energy,mechanical energy and electrical energy.MATLAB software was used to analyze the frequency response characteristics of the acoustoelectric conversion unit and the acoustoelectric power generation device.The simulation results show that the device has obvious narrowband characteristics,and the incident sound pressure and load resistance has a certain impact on the output characteristics of the device.The experimental results show that when the incident sound pressure is 120 dB and the load resistance is 8Ω,the incident sound frequency is at the resonance frequency of 350 Hz,the peak output power can reach 2.47 mW,and the average power density is 4.99μW/cm^(3)。