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Real-world attenuation of custom-moulded earplugs: Results from industrial in situ F-MIRE measurements

机译:定制耳塞的真实衰减:工业现场F-MIRE测量结果

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摘要

The attenuation provided by hearing protection devices (HPDs) is traditionally determined under laboratory conditions by means of a standardised method titled REAT (Real Ear Attenuation at Threshold). This performance is often overestimated compared to what has been measured so far in industrial reality. Concerning the earmuff, the formable earplug and preformed earplug type of HPD, there are numerous data related to the discrepancy between, on one hand, the laboratory measured attenuation which is labelled by the manufacturers and, on the other hand, the in situ estimated attenuation. But, few exist concerning custom-moulded earplug (CMEP) type protection devices. This paper presents the practical application of measurements intended to estimate the attenuation of this type of protection device while it is being worn by users during execution of their task. Three manufacturers of hearing protectors took part in this initiative; this participation involved the manufacturing of custom-moulded earplugs with a miniature microphone inserted. The measurements were carried out on 63 employees in nine industrial sites with diverse activities. The estimate of this in situ attenuation, in this study called level reduction (LR), was obtained from the difference between the noise exposure level measured close to the ear of the employee and the residual noise level measured under the earplug. The CMEP level reduction estimated in situ highlighted significant variability characteristics. The results of the measurements confirm the overestimation of the values indicated by the manufacturers. From 3 to 5 dB at high frequencies, the discrepancy can reach 8-10 dB at medium and low frequencies. The study also confirms that CMEPs which have been tested here, like other earplugs types, are unsuited to attenuate low frequencies.
机译:传统上,听力保护设备(HPD)所提供的衰减是在实验室条件下通过名为REAT(阈值处的真实耳朵衰减)的标准化方法确定的。与迄今为止在工业现实中测得的性能相比,该性能通常被高估了。关于耳罩,可成型耳塞和预成型耳塞类型的HPD,一方面有大量数据与制造商标记的实验室测得的衰减之间的差异有关,另一方面有原位估计的衰减之间的差异。 。但是,很少有涉及定制耳塞(CMEP)类型的保护设备的信息。本文介绍了测量的实际应用,旨在估算此类保护装置在用户执行任务期间佩戴时的衰减。三家听力保护器制造商参加了这一倡议;这种参与涉及制造带有微型麦克风的定制模制的耳塞。这项测量是在9个工业场所的63名员工中进行的,各项活动多种多样。该现场衰减的估计值,在本研究中称为降级(LR),是从靠近员工耳朵处测得的噪声暴露水平与在耳塞下测得的残留噪声水平之间的差异得出的。原位估计的CMEP水平降低突出了显着的可变性特征。测量结果证实了制造商指示值的高估。在高频下从3到5 dB,在中低频上差异可以达到8-10 dB。这项研究还证实,像其他耳塞类型一样,此处已测试的CMEP不适合衰减低频。

著录项

  • 来源
    《Applied Acoustics》 |2012年第7期|p.639-647|共9页
  • 作者

    Alain Kusy; Jacques Chatillon;

  • 作者单位

    Institut National de Recherche et de Securite, Rue du Morvan, CS 60027. F-54519 Vandaeuvre les Nancy Cedex. France;

    Institut National de Recherche et de Securite, Rue du Morvan, CS 60027. F-54519 Vandaeuvre les Nancy Cedex. France;

  • 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

    in situ measurement; F-MIRE method; real attenuation; HPD; custom moulded earplugs;

    机译:原位测量F-MIRE法;实际衰减;HPD;定制模压耳塞;

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