Analytic Formulation for the Sound Absorption of a Panel Absorber under the Effects of Microperforation, Air Pumping, Linear Vibration and Nonlinear Vibration
Figure 6
(a) The effect of damping ratio (low to high frequency excitation, 387.25 × 2π Hz, mm, m, mm, , mm, and ). (b) The effect of damping ratio (high to low frequency excitation, 387.25 × 2π Hz, mm, m, mm, , mm, and ).