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Numerical analysis of wave energy dissipation by damping treatments in a plate with acoustic black holes

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Abstract

The reduction of vibration by acoustic black holes (ABHs) with damping treatments can be achieved in two stages: energy focalization and energy dissipation. The energy focalization is mainly due to changes of the local thickness by slowing down the flexural wave speed and energy dissipation can be achieved by using viscoelastic damping materials. In structures with embedded ABHs, the damping effectiveness can depend significantly on the types of damping treatments. In this paper, 4 different damping treatments according to the types of attached region are considered in order to estimate the effectiveness of damping treatments as 1) a fully-covered unconstrained damping treatment, 2) a fully-covered constrained damping treatment, 3) a partially-covered unconstrained damping treatment and 4) a partially- covered constrained damping treatment as well as no damping treatment as reference data. In this study, the performance of damping treatments is explored using numerical simulations of three-dimensional thin plate embedded truncated ABH(s). The wave energy in the ABH, the normalized total energy and the focalization ratio are introduced to compare the effectiveness of the damping treatments. The numerical results show that the fully-covered constrained damping treatment provides the most effective configuration in terms of the wave energy in ABH and the normalized total energy.

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Authors and Affiliations

  1. School of Mechanical Engineering, Ulsan College, Ulsan, 44610, Korea

    Sun-Yong Kim

  2. Department of Mechanical Engineering, Dongeui University, Busan, 47340, Korea

    Dooho Lee

Authors
  1. Sun-Yong Kim
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  2. Dooho Lee
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Correspondence to Dooho Lee.

Additional information

Recommended by Associate Editor Junhong Park

Sun-Yong Kim received his Ph.D. degree from Mechanical and Materials Engineering at Queen’s University at Kingston in 2011. He worked as a Senior Research Engineer at Samsung Electronics and Hanwha Corporation from 2011 to 2016. He is currently working at Ulsan College as an Assistant Professor since March 2016. His research interests include design optimization, finite element analysis, vibration control and so on.

Dooho Lee received his B.S. degree from Seoul National University (Korea) in 1988, his M.S. from KAIST (Korea) in 1990, and his Ph.D. from KAIST (Korea) in 1994. He worked for Samsung Motors, Inc. (1995-1999), and is currently a Professor in Dongeui University. His research focuses on the design optimization of structural-acoustic systems, uncertainty propagation in dynamic problems, and sound transfer characteristics in human hearing systems.

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Kim, SY., Lee, D. Numerical analysis of wave energy dissipation by damping treatments in a plate with acoustic black holes. J Mech Sci Technol 32, 3547–3555 (2018). https://doi.org/10.1007/s12206-018-0705-8

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  • DOI: https://doi.org/10.1007/s12206-018-0705-8

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