Loss factor estimates for plates with periodic grids of embedded Acoustic Black Holes

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Abstract

Embedded Acoustic Black Holes (ABH) have significant potential as a passive treatment for attenuating structural vibration. The ABH effect is produced using a power taper in the plate structure thickness profile, resulting in a local asymptotic reduction of wave speed within the ABH. Theoretically the local wave speed approaches zero at the ABH center, thus the waves are "trapped" in the black hole. This work focused on plates with periodic grids of ABHs for structural vibration and radiated sound reduction. Plates with embedded ABH grids were modeled with finite element models, with the active and reactive air loading modeled with coupled boundary element models. The results show the ABHs reduce the radiated sound power by up to 20 dB. The reduction of radiated sound is due to both an increase in the mechanical damping and also a reduction in the plate structural-acoustic coupling. Detailed results for several ABH plates are compared with uniform plates, giving insight into key ABH design performance parameters.

Original languageEnglish (US)
Title of host publicationProceedings of ISMA 2014 - International Conference on Noise and Vibration Engineering and USD 2014 - International Conference on Uncertainty in Structural Dynamics
PublisherKU Leuven
Pages3359-3368
Number of pages10
ISBN (Electronic)9789073802919
StatePublished - 2014
Event26th International Conference on Noise and Vibration Engineering, ISMA 2014, Including the 5th International Conference on Uncertainty in Structural Dynamics, USD 2014 - Leuven, Belgium
Duration: Sep 15 2014Sep 17 2014

Other

Other26th International Conference on Noise and Vibration Engineering, ISMA 2014, Including the 5th International Conference on Uncertainty in Structural Dynamics, USD 2014
CountryBelgium
CityLeuven
Period9/15/149/17/14

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All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Mechanics of Materials
  • Acoustics and Ultrasonics

Cite this

Conlon, S. C., Fahnline, J. B., & Semperlotti, F. (2014). Loss factor estimates for plates with periodic grids of embedded Acoustic Black Holes. In Proceedings of ISMA 2014 - International Conference on Noise and Vibration Engineering and USD 2014 - International Conference on Uncertainty in Structural Dynamics (pp. 3359-3368). KU Leuven.