Abstract
An acoustic black hole, as a structure with a continuous gradient of thickness, has a good aggregation effect for bending waves. This paper introduces a novel carbon fiber reinforced plastic (CFRP) acoustic black hole sandwich structure. This structure comprises a CFRP panel and an acoustic black hole core layer, leveraging the aggregation effect of acoustic black holes to achieve vibration damping in low-frequency bands. Initially, the vibration transfer characteristics of acoustic black hole beams are examined based on the acoustic black hole effect. Subsequently, the influence of material, structure, and the number of acoustic black holes within the sandwich structures on their vibration transfer characteristics is investigated. Finally, the vibration characteristics of the CFRP sandwich structures are experimentally tested. The results indicate that the vibration transmission curve of the acoustic black hole beam exhibits multiple attenuation intervals within the 0-1200 Hz frequency range. Moreover, by adjusting the material and structural parameters of the core layer, the vibration bandgap of the sandwich structure can be shifted to the low-frequency region.
Published Version
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