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

Figure 9

(a) The effects of linear wall vibration and microperforation (𝜔_𝑊=80×2𝜋Hz, 𝜌_𝑤=240/m², 𝑡=0.8 mm, 𝑎=𝑏=0.1 m, 𝐷=250 mm, 𝜉_𝑊=0.02, 𝜎=0.5%, and 𝑑=0.4 mm). (b) The effects of linear wall vibration and microperforation (𝜔_𝑊=80×2𝜋Hz, 𝜌_𝑤=240/m², 𝑡=0.8 mm, 𝑎=𝑏=0.1 m, 𝐷=250 mm, 𝜉_𝑊=0.01, 𝜎=0.5%, and 𝑑=0.4 mm).

(a)

(b)