An Analysis of How Physical and Social Factors Influence …
197
Table 7 Measurement noise level in control room
Control room
Noise level
(L Aeq dB)
Exposure
duration (h)
Exposure
points
(job/task)
Exposure points
per hour
Starts from the shore
95
0.5
63
125
Ship is running
90
17
672
40
Mooring maneuver
99
0.5
157
314
Idle with generator
87
6
119
20
Total
24 h
1011 points 499 points
Daily noise exposure (L EP,d )
95 dB
Table 8 Measurement noise level inside the engine room
Engine room
Noise Level
(L Aeq dB)
Exposure
duration (h)
Exposure
points
(job/task)
Exposure points
per hour
Starts from the shore
110
0.5
1976
3953
Ship is running
108
17
42,399
2494
Mooring maneuver
109
0.5
1570
3140
Idle with generator
107
6
11,887
1981
Total
24 h
57,832
points
11,568 points
Daily noise exposure (L EP, d )
113 dB
3.3 Measurement of Noise
Simultaneously with vibration measurement, noise measurements were made with
the BlueSolo sonometer. The noise analysis was carried out in relation to the requirements of Directive 2003/10/EC, which state that: (a) exposure limit values: L EX,8h =
87 dB(A); (b) upper exposure action values: L EX,8h = 85 dB(A); (c) lower exposure
action values: L EX,8h = 80 dB(A).
Figure 6 shows an example of noise measured in the engines room. In the sonogram
(top right), the cursors are placed at 280.616 Hz and at 4 min 49 s (96.76 dB (A)).
For the moment of 4 min 49 s, the spectrum (top left) shows a maximum of 96.76 dB
(A) at 315 Hz. The Leq sound level has a maximum of 98.96 dB (A) at 6 min 57 s
in the time history (lower right) for 280.616 Hz.
The lower exposure action value (an L EP,d of 80 dB) is represented by 32 exposure
points, the upper exposure action value (L EP,d of 85 dB) by 100 points. In all cases,
the noise levels exceed the values indicated by the Directive 2003/10/EC by 18.75%
and 11.76% (95 dB vs. 80 dB and 85 dB) for the control room (Table 7). For the
197
Table 7 Measurement noise level in control room
Control room
Noise level
(L Aeq dB)
Exposure
duration (h)
Exposure
points
(job/task)
Exposure points
per hour
Starts from the shore
95
0.5
63
125
Ship is running
90
17
672
40
Mooring maneuver
99
0.5
157
314
Idle with generator
87
6
119
20
Total
24 h
1011 points 499 points
Daily noise exposure (L EP,d )
95 dB
Table 8 Measurement noise level inside the engine room
Engine room
Noise Level
(L Aeq dB)
Exposure
duration (h)
Exposure
points
(job/task)
Exposure points
per hour
Starts from the shore
110
0.5
1976
3953
Ship is running
108
17
42,399
2494
Mooring maneuver
109
0.5
1570
3140
Idle with generator
107
6
11,887
1981
Total
24 h
57,832
points
11,568 points
Daily noise exposure (L EP, d )
113 dB
3.3 Measurement of Noise
Simultaneously with vibration measurement, noise measurements were made with
the BlueSolo sonometer. The noise analysis was carried out in relation to the requirements of Directive 2003/10/EC, which state that: (a) exposure limit values: L EX,8h =
87 dB(A); (b) upper exposure action values: L EX,8h = 85 dB(A); (c) lower exposure
action values: L EX,8h = 80 dB(A).
Figure 6 shows an example of noise measured in the engines room. In the sonogram
(top right), the cursors are placed at 280.616 Hz and at 4 min 49 s (96.76 dB (A)).
For the moment of 4 min 49 s, the spectrum (top left) shows a maximum of 96.76 dB
(A) at 315 Hz. The Leq sound level has a maximum of 98.96 dB (A) at 6 min 57 s
in the time history (lower right) for 280.616 Hz.
The lower exposure action value (an L EP,d of 80 dB) is represented by 32 exposure
points, the upper exposure action value (L EP,d of 85 dB) by 100 points. In all cases,
the noise levels exceed the values indicated by the Directive 2003/10/EC by 18.75%
and 11.76% (95 dB vs. 80 dB and 85 dB) for the control room (Table 7). For the