The effect of leakage on the sound absorption of a nonlinear perforated panel backed by a cavity

摘要: Abstract This study investigates the sound absorption of a nonlinear perforated panel backed by cavity with leaking edges. Many other related works assume that is perfectly enclosed. first to address effect leakage on panel. The development formula based classical thin plate theory, three-dimensional wave equation and micro-perforation acoustic impedance. recently developed multi-level residue harmonic balance method introduced compute vibration responses. Unlike previous methods, proposed generates algebraic equations in process computing zero-level solutions only, produces linear higher-level processes. theoretical results obtained from numerical integration are reasonable agreement. effects various parameters such as excitation magnitude, damping ratio, depth, perforation ratio amount examined.