20, noise
In the
distance unit diesel engine and generator noise sound pressure at 1m average:
≤250KW> 250KW
≤102db (A) ≤108db (A)
Noise standards:
Sleep
<45db neighborhood of ambient noise, not more than 50 db during the day and
at night should be less than 45 (40) dB
Working
<65 db average person about 40 db sound can be maintained under normal
reaction and attention, but to work in an environment above 50 db, a long time
will be hearing loss, emotional upset, or even appear neurasthenia and so on.
Music
80db noise above 80 decibels children live in an environment, resulting in up
to 50% deaf-mute, the noise level is only 80 dB, 40 years in order to maintain
long-term work without hearing loss; at 100 decibels, only 60% of people do not
It will deafness. If people living in an environment above 80 decibels can
cause emotional irritability, hearing loss. Noise damage to the central nervous
effect and can induce cardiovascular diseases, eating in strong noise
environment, gastrointestinal capillary contraction occurs, the secretion of
digestive juice and gastrointestinal motility will be weakened, so that the
normal compromised blood supply. Intense noise can also cause abnormal
pregnancy, child mental retardation. Therefore, their daily lives to minimize
noise sources and propagation.
85 db or
less can cause a slight hearing loss;
85 db -90
dB can cause noise-induced hearing loss a few people;
90-100
decibels can cause a certain amount of noise-induced hearing loss;
100 db or
more, it will cause a considerable amount of noise-induced hearing loss, these
belong to chronic noise-induced hearing loss.
--- Five
minutes above 105 db schizophrenia
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