Building Acoustics

92 Building acoustics

Figure 3.19 Phase speed of bending waves in concrete slabs of thickness 50, 100, 150 and 200 mm. Thin lines –
calculated using thin plate theory. Thick lines – calculated using Equation (3.106). Horizontal line – acoustic
wave speed in air.

Figure 3.20 Phase speed of bending waves in steel plates of thickness 1, 2, 5 and 10 mm. See also caption of
Figure 3.19.

100 200 500 1000 2000 5000 10000

Frequency (Hz)

100

1000

10000

200

500

2000

5000

Phase speed (m/s)

(^10050) Air
200

100 200 500 1000 2000 5000 10000

Frequency (Hz)

10

100

1000

20

50

200

500

Phase speed (m/s)

Air

10

5

2

1