Daily noise dose when noise exposure consists of periods with different
noise levels.
Sponsored Links
When the daily noise exposure consists of periods of different noise
levels, the daily dose can be calculated as:
D = ( te1
/ td1 + te2 / td2 + ... + ten / tdn
) 100%
where
D
= daily noise exposure (%)
te
= exposure time at a specified noise level
According the National Institute for
Occupational Safety - NIOSH
- the daily dose level - D
- should not equal or exceed 100.
The daily dose can be converted to an 8-hr Time-Weighted
Average -TWA by the formula
TWA = 10
log( D / 100 ) + 85 (1)
Daily noise dose as an 8-hr TWA for different daily noise
doses:
|
Daily Noise Dose (%)
|
8-hr TWA
(dBA) |
|
20
|
78.0
|
|
30
|
79.8
|
|
40
|
81.0
|
|
50
|
82.0
|
|
60
|
82.8
|
|
70
|
83.5
|
|
80
|
84.0
|
|
90
|
84.5
|
|
100
|
85.0
|
|
200
|
88.0
|
|
400
|
91.0
|
|
600
|
92.8
|
|
800
|
94.0
|
|
1,000
|
95.0
|
|
1,500
|
96.8
|
|
2,000
|
98.0
|
|
4,000
|
101.0
|
|
6,000
|
102.8
|
|
8,000
|
104.0
|
|
10,000
|
105.0
|
|
20,000
|
108.0
|
|
40,000
|
111.0
|
|
60,000
|
112.8
|
|
80,000
|
114.0
|
|
100,000
|
115.0
|
|
150,000
|
116.8
|
|
200,000
|
118.0
|
|
400,000
|
121.0
|
|
600,000
|
122.8
|
|
800,000
|
124.0
|
|
1,000,000
|
125.0
|
|
2,000,000
|
128.0
|
|
4,000,000
|
131.0
|
|
6,000,000
|
132.8
|
|
8,000,000
|
134.0
|
|
10,000,000
|
135.0
|
|
20,000,000
|
138.0
|
Hiç yorum yok:
Yorum Gönder