中国物理B ›› 2022, Vol. 31 ›› Issue (11): 114301-114301.doi: 10.1088/1674-1056/ac6b20

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An improved lumped parameter model predicting attenuation of earmuff with air leakage

Xu Zhong(仲旭), Zhe Chen(陈哲), and Dong Zhang(章东)†   

  1. Key Laboratory of Modern Acoustics, Institute of Acoustics, Nanjing University, Nanjing 210093, China
  • 收稿日期:2022-01-05 修回日期:2022-04-22 接受日期:2022-04-28 出版日期:2022-10-17 发布日期:2022-10-28
  • 通讯作者: Dong Zhang E-mail:dzhang@nju.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11934009 and 11874216).

An improved lumped parameter model predicting attenuation of earmuff with air leakage

Xu Zhong(仲旭), Zhe Chen(陈哲), and Dong Zhang(章东)†   

  1. Key Laboratory of Modern Acoustics, Institute of Acoustics, Nanjing University, Nanjing 210093, China
  • Received:2022-01-05 Revised:2022-04-22 Accepted:2022-04-28 Online:2022-10-17 Published:2022-10-28
  • Contact: Dong Zhang E-mail:dzhang@nju.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11934009 and 11874216).

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摘要： Since air leakage is inevitable when earmuffs are worn improperly or together with safety glasses in factory or military, it is required to be considered to accurately predict earmuff attenuation. Besides unwanted air leakage, under controlled air leakage is introduced to earmuff to achieve adjustable attenuations in different signal-to-noise ratios (SNRs) and balance between attenuation and speech intelligibility. This work is to develop an improved lumped parameter model (LPM) to predict earmuff attenuation with consideration of air leakage. Air leakage paths are introduced into conventional LPM without air leakage, and air leakage path impedance is analytically described by Maa's microperforated tube impedance. Earmuff passive attenuation behavior can be analytically described and analyzed with the improved LPM. Finally, the validity of improved LPM is verified experimentally. The results indicate that the improved LPM can predict earmuff attenuation with air leakage, and air leakage deteriorates earmuff attenuation and turns resonance frequency higher.

关键词: earmuff, lumped parameter model, air leakage, attenuation

Abstract: Since air leakage is inevitable when earmuffs are worn improperly or together with safety glasses in factory or military, it is required to be considered to accurately predict earmuff attenuation. Besides unwanted air leakage, under controlled air leakage is introduced to earmuff to achieve adjustable attenuations in different signal-to-noise ratios (SNRs) and balance between attenuation and speech intelligibility. This work is to develop an improved lumped parameter model (LPM) to predict earmuff attenuation with consideration of air leakage. Air leakage paths are introduced into conventional LPM without air leakage, and air leakage path impedance is analytically described by Maa's microperforated tube impedance. Earmuff passive attenuation behavior can be analytically described and analyzed with the improved LPM. Finally, the validity of improved LPM is verified experimentally. The results indicate that the improved LPM can predict earmuff attenuation with air leakage, and air leakage deteriorates earmuff attenuation and turns resonance frequency higher.

Key words: earmuff, lumped parameter model, air leakage, attenuation

中图分类号:  (General linear acoustics)

  • 43.20.+g
43.20.Rz (Steady-state radiation from sources, impedance, radiation patterns, boundary element methods)