Civil Engineering Reference
In-Depth Information
20
10
5
15
3
2
10
1
5
0
0.1
0.2
0.3
0.5
1
2
3
5
Figure 8.10
Acoustic lining attached to the primary construction by infinitely stiff studs. The maximum
improvement in the sound reduction index is given as a function of c-c distance of studs. The parameter shown
on the curves is the critical frequency of the lining in kHz.
Distance between studs (m)
80
70
60
50
40
30
20
87 mm brick (Poroton)
w/panel + wooden studs
w/panel + steel studs
dR - Predicted
10
0
63
125 250 500 1000 2000 4000
Frequency (Hz)
Figure 8.11
Brick wall with lining. Sound reduction index and improvement by lining of 12 mm chipboard
directly attached to the wall. Measured data from Homb et al. (1983).
