【摘要】 本文以非噪声作业青年30名为受试者,佩戴棉纱耳塞,用真耳阈值法作60耳的棉纱耳塞隔声值评价。实验结果表明:棉纱耳塞对高频段衰减声强达16.25～21.17dB,对语频声信号衰减较少。这样,既有一定的隔声值,又不妨碍在工作环境中言语的交流。棉纱耳塞隔声值13.86dB,在噪声强度不超过104dB(A)的情况下,佩戴棉纱耳塞可将噪声衰减到符合《工业企业噪声卫生标准》中现有企业暂时达不到标准参照表范围内。更多还原

【Abstract】 The noise-reducing effects of the cotton-yarn earplugs was evaluated by comparing the hearing threshold value of ear before and after the earplug wearing among 30 noise-free workers.The result showed that at high frequency section, the plug the diminution was shown as much as 16.25 to 21.17 dB. However, without an apparant diminution at phonic frequency section. It was clear that the plug had a diminishing effect for high frequency noise without interfering the phonic exchange. The average diminished value was 13.86dB. Under the noise level not greater than 104dB(A) wearing of cotton-yarn earplug can keep the noise level well within the permissible standard.更多还原