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

Figure 10

Measured sound transmission loss (left column) and effect of perforation (right column) of plates with macro size holes: (a) 𝑑_𝑜=1.5mm, 𝜎=1%, (b) 𝑑_𝑜=3mm, 𝜎=1%, and (c) 𝑑_𝑜=1.5mm, 𝜎=2%.

(a)

(b)

(c)

(d)

(e)

(f)