作者：李勇, 陆炳健, 何天雨, 陈挺, 鞠玲

作者单位：国网江苏省电力有限公司泰州供电分公司，江苏 泰州 225300

关键词：指数型聚音曲面;声学谐振腔;有限元仿真;非接触式声学测量

摘要：

测量微弱声学信号时，存在信号易被环境噪声淹没的问题，导致测量结果信噪比较差。针对此，该文以具有指数型曲面的声学谐振腔为研究对象，探究声音在谐振腔中的传播特性及其对微弱声学信号的共振增强机理。利用声学波动理论分析与有限元建模仿真，在硬声场边界条件下建立声学谐振腔的频率响应与内部声压模型，进而利用实验对其声学放大与信噪比提升特性进行表征。理论与实验结果表明，声学谐振腔能够有效放大特定频率声学信号5~10倍，且明显改善信号的非线性失真。该文的研究，揭示聚音器定频增强的机理，证明指数型曲面声学谐振腔可作为非接触式声学测量前端放大装置的潜力。

Polyphonic design based on the resonance enhancement principle
LI Yong, LU Bingjian, HE Tianyu, CHEN Ting, JU Ling
Taizhou Power Supply Branch,State Grid Jiangsu Electric Power Co., Ltd., Taizhou 225300, China
Abstract: Measurement of weak acoustic signals is easily affected by environmental noise, leading to poor signal-to-noise ratio of the results. In this article, an acoustic resonant resonator with an exponential profile and its resonant-enhancement characteristics of sound is investigated. Using acoustic fluctuation theory analysis and finite element modeling simulation, the frequency response and internal sound pressure model of the acoustic resonant cavity are established under hard acoustic field boundary conditions. Then the acoustic amplification and signal-to-noise ratio enhancement characteristics are evaluated in experiments. The theoretical and experimental results show that the acoustic resonant cavity can effectively amplify the acoustic signal with specific frequencies by 5-10 times, and significantly improve the nonlinear distortion of the signal. This study reveals the mechanism of the resonant-enhancement of the acoustic resonator and demonstrates its potential as a front-end amplification device for non-contact acoustic measurements.
Keywords: exponential acoustic horn;acoustic resonator;finite element simulation;non-contact acoustic measurements
2024, 50(7):124-130  收稿日期: 2022-09-21;收到修改稿日期: 2023-04-26
基金项目: 国网江苏省电力有限公司科技项目（J2021208）
作者简介: 李勇（1975-），男，江苏扬州市人，高级工程师，研究方向为电力设备智能运检。
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