Abstract
Sound absorption across a wide range of frequencies is a focus in contemporary acoustics. Recently, integral bounds of absorption or reflection coefficients were introduced as a guide of design optimization following the footsteps of electromagnetics, where integral relations were derived based on system causality considerations. This talk examines the relation between the integral bound and the effects of various physical boundary conditions and the bulk absorber material, with the hope to raise the bound. Effects of various approximations made during mathematical derivation are also examined by comparison with specific numerical examples, and the physics of the bound is thoroughly discussed. The findings are expected to have significant implications for the development of effective noise reduction strategies and the advancement of smart acoustic design.
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