In:
The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 86, No. S1 ( 1989-11-01), p. S40-S40
Abstract:
The hearing of 410 groundcrew who had worked under 100–130 dB(A) aircraft noise was measured. The groundcrew were divided into four groups by the length of service: less than 5 years, 5–9 years, 10–14 years, and 15–20 years. Their audiograms were taken with a Kamplex audiometer in a soundproof mobile cabin, in which background noise was 23–25 dB(A). One-hundred and forty seven military men of comparable age who had not been exposed to excessive noise were selected as a control group. Their audiograms were taken in the same way. The results indicated that the hearing injury was an actual menace to the groundcrew. Among them the high-frequency hearing loss and the noise deafness made up 46.1% and 6.1%, respectively. Compared with the control group of the same age, the differences of the hearing average value of each frequency were significant. Their hearing injury was aggravated with the length of service. The high-frequency hearing losses of the four groups, less than 5 years, 5–9 years, 10–14 years, and 15–20 years, were 32.7%, 47.3%, 54.4%, and 67.3%, respectively. In order to prevent hearing damage, the groundcrew ought to wear ear protectors and the ground noise suppressors should be used when the aircraft engine is operating. It was discovered that the “V”-shaped depression was not at 4 kHz but at 6 kHz in 410 groundcrew. There were similar phenomena in domestic and foreign literatures. The former views concerning the pathogenesis of the “4-kHz depression,” therefore, is open to question. This is a quite interesting subject that warrants further study.
Type of Medium:
Online Resource
ISSN:
0001-4966
,
1520-8524
Language:
English
Publisher:
Acoustical Society of America (ASA)
Publication Date:
1989
detail.hit.zdb_id:
1461063-2
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