The aggregation effect and damping properties of an acoustic black hole plate with a crack

Abstract To ensure the effective use of the structure, it is necessary to analyze the influence of the crack on the structure. Therefore, this paper establishes a simulation model of an acoustic black hole plate with a crack. The aggregation effect and vibration characteristics of an ABH plate with a crack are studied using a numerical analysis method, and the vibration reduction mechanism of this plate is analyzed using modal density and damping level. The results indicate that the impact of the crack on wave propagation within the plate depends on the relationship between the crack length and the wavelength at the crack tip. When the crack length is greater than or equal to the wavelength of the crack tip, the wave reflection and scattering effects are significant. Compared with the uniform thin plate with a crack (UTP), the influence of the crack on the energy distribution of the ABH plate and UTP is different. Compared with the intact ABH plate, the existence of a crack makes the energy in the ABH region gather in the reflection zone. The vibration reduction effect of the ABH plate with the 20% vertical crack is improved by 3–8dB in the high-frequency band. Still, increased crack length does not significantly improve the vibration reduction performance.