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Objective assessment of the sound paths through earmuff components

机译：客观评估通过耳罩组件的声音路径

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摘要

This paper proposes an objective measurement methodology to assess the sound transmission paths through various earmuff components (cup, cushion, back-plate, foam insert, sihcone flesh) and estimate the vibroacoustic couplings between them. The measurement methodology is applied to two different commercial earmuffs. For each Hearing Protection Device (HPD), the different sound paths are assessed, by analyzing separately the vibroacoustic behavior of each HPD component. In particular, the Insertion Loss (IL) of the lateral walls of the cushion is assessed, with and without pumping motion. The effect of the coupling between the different parts is also investigated from the comparison of the separate components with the complete earmuff. As shown in past studies, results confirm that the acoustical behavior of an earmuff is governed by the pumping motion and air leaks at low frequency and by the sound path through the cup and the cavity resonances at high frequency. However, at mid frequency, new counterintuitive results are revealed. It is found that earmuffs do not behave as their weakest element, but rather as the one which has the highest attenuation. It is also observed that the foam insert can also decrease the IL. Complementary tests using other absorbing materials show that this effect could mainly be attributed to the absorption behaviors of each material at medium frequencies.
机译：本文提出了一种客观的测量方法，以评估通过各种耳罩组件（杯，垫子，背板，泡沫插入物，sihcone肉）的声音传播路径，并估计它们之间的声声耦合。该测量方法适用于两种不同的商业耳罩。对于每个听力保护设备（HPD），通过分别分析每个HPD组件的振动声行为来评估不同的声音路径。特别地，在有或没有泵送运动的情况下，评估垫子的侧壁的插入损耗（IL）。还通过将单独的组件与完整的耳罩进行比较，研究了不同部分之间的耦合效果。如过去的研究所示，结果证实，耳罩的声学行为受低频下的抽气运动和空气泄漏以及高频下通过杯的声路和空腔共振的支配。但是，在中频处，发现了新的违反直觉的结果。发现耳罩不是最弱的元素，而是衰减最大的元素。还观察到泡沫插入物也可以降低IL。使用其他吸收材料的补充测试表明，这种影响可能主要归因于每种材料在中频处的吸收行为。

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  • 来源
    《Applied Acoustics》 |2014年第9期|76-85|共10页
  • 作者

    Sylvain Boyer; Olivier Doutres; Franck Sgard; Frederic Laville; Jerome Boutin;

  • 作者单位

    Ecole de Technologie Superieure, Department of Mechanical Engineering, 1100 rue Notre-Dame, Ouest, Montreal, QC H3C 1K3, Canada;

    GAUS, Department of Mechanical Engineering, Universite de Sherbrooke, QC J1K 2R1, Canada;

    Institut de Recherche Robert-Sauve en Sante et Securite du Travail, 505 Boul. de Maisonneuve, Montreal, QC H3A 3C2, Canada;

    Ecole de Technologie Superieure, Department of Mechanical Engineering, 1100 rue Notre-Dame, Ouest, Montreal, QC H3C 1K3, Canada;

    Institut de Recherche Robert-Sauve en Sante et Securite du Travail, 505 Boul. de Maisonneuve, Montreal, QC H3A 3C2, Canada;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Hearing protection; Earmuffs; Insertion loss; Laboratory measurements;

    机译：听力保护;耳套;插入损耗;实验室测量;

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