Acoustic black hole effect
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Acoustic black hole effect is a physical phenomenon describing a large increase in damping of flexural vibrations in plates of variable thickness due to the combined action of a thin absorbing layer attached to one or both surfaces of a plate and of the so-called acoustic black hole geometry of a plate. The acoustic black hole geometry can be materialised by creating a gradual reduction in local thickness of a plate with wave propagation distance to almost zero, i.e. by creating sharp elastic wedges. Such a gradual reduction should follow a power-law function of the propagation distance, with the power-law exponent being equal or larger than two. Consequently, the velocity of a propagating flexural wave is reduced with distance according to a power-law function with the exponent equal or larger than one. Under these conditions, the described acoustic black hole effect, often mentioned as simply 'acoustic black hole', provides almost 100% absorption of the incident flexural waves even for nonideally sharp (truncated) elastic wedges and for very small pieces of attached absorbing layers.[1][2]
The acoustic black hole effect can exist also for air-borne sound propagating in specially modified acoustic waveguides containing some added absorbing materials and providing a required reduction in acoustic wave velocity with propagation distance according to a power-law profile, with the power-law exponent equal or larger than one.[3]
References
- ↑ Pelat, A.; Gautier, F.; Conlon, S.C.; Semperlotti, F. (2020). "The acoustic black hole: A review of theory and applications". Journal of Sound and Vibration. 476. Bibcode:2020JSV...47615316P. doi:10.1016/j.jsv.2020.115316. Unknown parameter
|article-number=ignored (help) - ↑ Zhao, C.; Prasad, M.G. (2019). "Acoustic black holes in structural design for vibration and noise control". Acoustics. 1 (1): 220–251. doi:10.3390/acoustics1010014.
- ↑ Mousavi, A.; Berggren, M.; Wadbro, E. (2022). "How the waveguide acoustic black hole works: A study of possible damping mechanisms". Journal of the Acoustical Society of America. 151: 4279–4290. doi:10.1121/10.0011788.
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