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

摘要: This study includes the first work about absorption of a panel absorber under effects microperforation, air pumping, and linear nonlinear vibrations. In practice, thin perforated is backed by flexible wall to enhance acoustic performance within room. The easily excited vibrate nonlinearly can linearly. However, assumptions vibration no are adopted in many research works. development formula based on classical approach electroacoustic analogy, which impedances vibrations parallel connected that cavity series. Unlike those finite element, numerical integration, multiscale solution methods so forth, analytic calculate does not require heavy computation effort suitable for engineering calculation purpose. theoretical result obtained from proposed method shows reasonable agreement with previous integration method. It be concluded overall bandwidth an appropriate configuration optimized widened making use positive vibration.