|Document ID (ISN)||58793|
|ISSN - Serial title
||0736-2501 - Noise Control Engineering Journal
|Convention or series no.
||Effects of cup, cushion, band force, foam lining and various design parameters on the attenuation of earmuffs
||Mar.-Apr. 1992, Vol.38, No.2, p.59-65. Illus. 20 ref.
||Commercial and custom-made earmuffs were tested on volunteers by a miniature microphone method in an anechoic room and in a low-frequency chamber, and on a simulator in an acoustic tunnel. Changes in the cup or its foam lining improved attenuation by as much as 10dB. Changes in the material or shape of the cushion improved attenuation by up to 4dB. Effects of modifications were frequency-dependent. Breaks in the cushion or holes in the cup degraded attenuation by up to 30dB, whereas producing a gap between the cushion and the head degraded attenuation by less than 10dB. In practice, tight fit and an increase in sound absorption inside the cup were most important for improving sound attenuation.
||earmuffs; sound attenuation
||evaluation of equipment
||D - Periodical articles
|Country / State or Province||Finland|
||Noise, hearing and vibration
|Broad subject area(s)