Nonlocal acoustic black hole metastructures: Achieving broadband and low frequency passive vibration attenuation

This paper introduces the concept of nonlocal Acoustic Black Hole (ABH) metastructure and explores, via numerical analyzes, corresponding vibration attenuation performance. Building on basic ABH metastructure, which is a thin plate waveguide with embedded periodic grids ABHs, this work explores feasibility using intentionally introduced nonlocality to expand dynamic operating range absorbers. The design expressively conceived address two-fold objective lowering cut-on frequency an individual extending towards lower part spectrum (or, equivalently, longer wavelengths). role transient steady state response investigated dedicated semi-analytical model. Different designs are presented their performances compared models. Results show remarkable ability achieve significant behavior in low bandwidth.