|Document ID (ISN)||59744|
|ISSN - Serial title
||0002-8894 - American Industrial Hygiene Association Journal
|Convention or series no.
||Pääkkönen R., Vienamo T., Järvinen J., Hämäläinen E.
||Development of a new noise helmet
||Oct. 1991, Vol.52, No.10, p.438-444. Illus. 19 ref.
||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.
||hearing protection; noise; noise level; equipment testing; sound attenuation; acoustic helmets; noise control
||description of equipment; design of equipment; earmuffs
||D - Periodical articles
|Country / State or Province||Finland|
||Noise, hearing and vibration
|Broad subject area(s)