中国机械工程

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可调频Helmholtz共振器声学性能

安君;吕海峰;耿彦章;韩彦南   

  1. 中北大学机械工程学院,太原,030051
  • 出版日期:2018-04-25 发布日期:2018-04-24
  • 基金资助:
    国家自然科学基金资助项目(51305409);
    山西省青年科技研究基金资助项目(2013021020-2)
    National Natural Science Foundation of China(No. 51305409)

Acoustic Performance of Tunable Helmholtz Resonator

AN Jun;LYU Haifeng;GENG Yanzhang;HAN Yannan   

  1. School of Mechanical Engineering,North University of China,Taiyuan,030051
  • Online:2018-04-25 Published:2018-04-24
  • Supported by:
    National Natural Science Foundation of China(No. 51305409)

摘要: 传统的Helmholtz共振器属于被动消声结构,只要结构确定,其消声频率就被确定,然而,实际噪声环境中,频率经常发生改变。针对这种情况,设计出一种可调频Helmholtz共振器。利用压电陶瓷替代Helmholtz共振器的刚性背板,通过调节施加在压电陶瓷上的电压,改变其腔体体积,使得消声频率偏移。结果表明,压电陶瓷在施加400V电压后,可以产生0.515mm的位移;Helmholtz共振器在不同电压下,共振频率偏移了80Hz;设计的自适应控制程序可适应频率多变的噪声环境。

关键词: 共振器, 消声, 压电陶瓷, 共振频率

Abstract: Traditional Helmholtz resonators belonged to passive silencer structures, and its acoustic performances were determined as long as its structures were determined. However, frequency often changed in actual noise environment. In response to this situation, a tunable frequency Helmholtz resonator was proposed. Piezoelectric ceramics which was instead of rigid backplane of the Helmholtz resonator changed the volume of chamber by adjusting the voltage applied to the piezoelectric ceramics, thereby distorted the silencer frequency. Experiments show that the piezoelectric ceramic in the applications of 400V voltage may produce 0.515mm displacement. Resonant frequency of the Helmholtz resonator is shifted by 80Hz at different voltages, and a control program is designed to meet the frequency changing noise environments.

Key words: Helmholtz resonator, noise suppression, piezoelectric ceramics, resonant frequency

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