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

Figure 3

Comparison of sound transmission loss of DL (—) with that of DL-MPP for different locations in the gap (𝑑_𝑜=0.1 mm, 𝜎=1.5%, 𝐷=100 mm; · □ · 𝑙=0.9𝐷, – – 𝑙=0.5𝐷, – · – 𝑙=0.2𝐷, and ··· 𝑙=0.1𝐷).