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

Figure 7

(a) The absorption peaks due to the (1,1) and (1,3) mode vibrations (low to high frequency excitation, 𝑡=0.5 mm, 𝑎=𝑏=0.15 m, 𝐷=250 mm, and 𝑘=5). (b) The vibration peaks due to the (1,1) and (1,3) mode vibrations (low to high frequency excitation, 𝑡=0.5 mm, 𝑎=𝑏=0.15 m, 𝐷=250 mm, and 𝜅=5).

(a)

(b)