Research Article

Normal Incidence of Sound Transmission Loss from Perforated Plates with Micro and Macro Size Holes

Figure 4

The effect of perforation on the transmission loss of aluminium perforated plates having thickness  mm with (a)-(b) micro size holes and (c)-(d) medium size holes subjected to normal incidence of sound: (a) %, (b)  mm, (c) %, and (d)  mm.
534569.fig.004a
(a)
534569.fig.004b
(b)
534569.fig.004c
(c)
534569.fig.004d
(d)