Normal Incidence of Sound Transmission Loss of a Double-Leaf Partition Inserted with a Microperforated Panel

Figure 9

Transmission loss of DLMPP (𝐷=70 mm, 𝑙=0.15𝐷): (a) 𝑑_𝑜=0.3 mm, 𝜎=0.5%, (b) 𝑑_𝑜=0.4 mm, 𝜎=1%, and (c) 𝑑_𝑜=0.5 mm, 𝜎=1% (— theory (double panel), ··· theory (DL-MPP), and – – measured).

(a)

(b)

(c)