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

Abstract

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.

본 논문에서는 Acoustic Black Hole(ABH) 구조의 성능을 이해하고 비교하기 위해 유한요소해석을 수행하였다. 선행연구에 따르면 ABH 구조는 횡파의 전파 속도를 0에 가깝게 감소시켜 횡방향 진동을 감쇠시키는 것으로 보고되어 왔다. 또한 동적 진동 흡수기의 성 능을 분석하고 이를 ABH 구조의 성능과 비교하였다. 본 연구의 목적은 ABH와 동적 진동 흡수기의 특성을 이해하는 데 있다.