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

Figure 2

Comparison between the results from the proposed classical and numerical methods (𝑡=0.8 mm, 𝑎=𝑏=0.1 m, 𝐷=250 mm, 𝜉=0.01, 𝜎=0.5%, 𝑑=0.4 mm, and 𝜅=5.8).