Analytic Formulation for the Sound Absorption of a Panel Absorber under the Effects of Microperforation, Air Pumping, Linear Vibration and Nonlinear Vibration

Figure 8

(a) The effects of the air pumping and microperforation (𝑡=0.3 mm, 𝑎=𝑏=0.1 m, 𝐷=150 mm, 𝜎=0.5%, 𝑑=0.3 mm, 𝐿=10 mm, and 𝑎_𝑡=5 mm). (b) The effects of the air pumping and microperforation (𝑡=0.3 mm, 𝑎=𝑏=0.1 m, 𝐷=100 mm, 𝜎=0.28%, 𝑑=0.3 mm, 𝐿=10 mm, and 𝑎_𝑡=5 mm).

(a)

(b)