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Design of a pulse generator and shock tube for measuring hearing protector attenuation of high-amplitude impulsive noise

机译：用于测量听力保护器对高幅脉冲噪声的衰减的脉冲发生器和冲击管的设计

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摘要

The effectiveness of hearing protectors against high amplitude impulse noise levels remains the subject of research with objective testing techniques using acoustic test fixtures offering the only realistic method of providing rapid performance data for protector design and qualification. The work presented in this paper examines a prototype test method based on a shock tube and acoustic test fixture for the evaluation of protectors against high-level impulsive noise where established real ear attenuation at threshold methods would be impractical to apply. The results show that the system is capable of producing controlled repeatable high amplitude pressure pulses of variable duration for testing hearing protection devices in a grazing wave type test. A series of pilot tests illustrate how the system can have a sufficient self-insertion loss to reject flanking noise and allow the measurement of protector attenuations of up to 45 dB with little corruption from flanking noise.
机译：听力保护器针对高振幅脉冲噪声水平的有效性仍然是研究的主题，使用声学测试夹具的客观测试技术提供了唯一可行的方法，可为保护器设计和鉴定提供快速的性能数据。本文介绍的工作检验了一种基于冲击管和声学测试夹具的原型测试方法，用于评估针对高冲击脉冲噪声的保护器，其中无法应用在阈值方法下建立真实的耳朵衰减。结果表明，该系统能够产生可变持续时间的受控可重复的高振幅压力脉冲，用于在掠波式测试中测试听力保护装置。一系列的先导测试说明了系统如何具有足够的自插入损耗来抑制侧翼噪声，并允许测量高达45 dB的保护器衰减，而不会受到侧翼噪声的破坏。

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