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

Figure 6

Comparison of sound transmission loss of DL (thick line) with that of DL-MPP (thin line) for different air gaps (𝑙=0.1𝐷, 𝑑_𝑜=0.1 mm, 𝜏=0.5%; — 𝐷=50 mm, – – 𝐷=100 mm, and ··· 𝐷=200 mm).