منابع مشابه
Attenuation of earplugs worn in combination with earmuffs.
If the attenuation that can be provided by a single hearing protection device (HPD) is inadequate for a given noise exposure and if noise control procedures are impracticable, the only remaining alternative is to use dual protectors, i.e. an earplug plus an earmuff. Such a combination can provide additional protection but it has long been recognized that the resultant noise reduction falls shor...
متن کاملNoise attenuation and proper insertion of earplugs into ear canals.
OBJECTIVES The study was done to determine whether the noise attenuation attained with the use of earplugs can be improved by teaching the proper insertion of earplugs to users. METHODS Fifty-four randomly selected male subjects were divided into an untrained group (25 persons) and a trained group (29 persons). The trained group was given a lecture on earplug insertion and allowed to practise...
متن کامل[Assessment of the impulse noise attenuation by earplugs in metalworking processes].
BACKGROUND The aim of the study was to answer the question of whether earplugs provide sufficient protection in the exposure to impulse noise generated during metalworking processes. MATERIAL AND METHODS The noise generated by die forging hammer and punching machine was characterized. Using an acoustic test fixture, noise parameters (LCpeak, LAmax) under 24 earplugs, foam, winged and no-roll,...
متن کاملSound attenuation from earmuffs and earplugs in combination: maximum benefits vs. missed information.
INTRODUCTION Noise levels from military aircraft range from 100-130 dBA. Peak pressure levels from large caliber weapons may reach 180 dB SPL. To protect against hearing loss, individuals are encouraged to wear double hearing protection. This study determined ways to maximize benefit. METHOD Hearing thresholds from 0.25-8 kHz and consonant discrimination were assessed in normal-hearing subjec...
متن کاملTitle : Real - world attenuation of custom - moulded earplugs : Results from industrial in situ F - MIRE measurements
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 n...
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ژورنال
عنوان ژورنال: The Journal of the Acoustical Society of America
سال: 1972
ISSN: 0001-4966
DOI: 10.1121/1.1982041