Mechanisms of Flexural-Wave Attenuation in Acoustic Black Hole Structures: A Numerical Investigation

This paper presents a comprehensive numerical investigation of acoustic black hole (ABH) structures based on finite-element simulations.Previous studies demonstrated that ABH structures can effectively attenuate transverse (flexural) vibrations by gradually reducing the local wave speed toward zero, thereby inducing energy concentration and enhancing dissipation.Based on this concept, this study aims to elucidate the underlying attenuation mechanisms and the overall performance characteristics of ABH structures.Thus, finite-element analyses are performed to evaluate the wave-propagation behavior and vibration-reduction capability of the ABH configuration under various conditions.Additionally, for a comparative assessment, the performance of a conventional dynamic vibration absorber is investigated using an equivalent numerical framework.By systematically comparing these two approaches, this study aims to highlight the distinctive features, advantages, and limitations of ABH-based passive control relative to conventional vibration-mitigation techniques.