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Document ID (ISN)59744
CIS number 93-644
ISSN - Serial title 0002-8894 - American Industrial Hygiene Association Journal
Year 1991
Convention or series no.
Author(s) Pääkkönen R., Vienamo T., Järvinen J., Hämäläinen E.
Title Development of a new noise helmet
Bibliographic information Oct. 1991, Vol.52, No.10, p.438-444. Illus. 19 ref.
Abstract A prototype for a new noise helmet was developed because high noise levels were not sufficiently attenuated by commercially available helmets. The new helmet was designed to be tight, especially in the area of the throat and face, and to cover the entire head. The noise attenuation properties of the new helmet were tested against pink noise in an anechoic room, jet engine noise, and low-frequency noise with the test subjects wearing a miniature microphone under the protector. The new helmet provides insertion loss of over 50dB, which is 18-29dB more attentuation than that of the tested earmuffs in the frequency range of 1-8kHz. It is also better (8-13dB) than the tested earmuffs at frequencies of 125-1000Hz, and it protects against air impurities because the air fed into the helmet is filtered.
Descriptors (primary) hearing protection; noise; noise level; equipment testing; sound attenuation; acoustic helmets; noise control
Descriptors (secondary) description of equipment; design of equipment; earmuffs
Document type D - Periodical articles
Country / State or ProvinceFinland
Subject(s) Noise, hearing and vibration
Broad subject area(s) Physical hazards
Browse category(ies) Noise
Hearing protection