Structural damping by lightweight poro-elastic media

The structural damping performance of limp porous media: i.e., fibrous layers with negligible bulk frame elasticity, was investigated previously. Presented here is a study focusing on porous damping media (i.e., fibers, foams, etc.) with elastic frames, here referred to as “poro-elastic media”. By u...

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Bibliographic Details
Published in:Journal of sound and vibration 2019-10, Vol.459, p.114866, Article 114866
Main Authors: Xue, Yutong, Bolton, J. Stuart, Herdtle, Thomas, Lee, Seungkyu, Gerdes, Ronald W.
Format: Article
Language:English
Subjects:
Damping
Elastic layers
Elastic media
Elasticity
Energy dissipation
Finite element method
Inertia
Materials elasticity
Mathematical analysis
Poro-elastic media
Porous materials
Porous media
Power dissipation
Solid phases
Structural damping
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Summary:The structural damping performance of limp porous media: i.e., fibrous layers with negligible bulk frame elasticity, was investigated previously. Presented here is a study focusing on porous damping media (i.e., fibers, foams, etc.) with elastic frames, here referred to as “poro-elastic media”. By using the near-field damping (NFD) analytical toolbox, the power distributions and damping performances were evaluated for both a limp porous layer and a poro-elastic layer resting on an infinitely-extended stiff panel driven by a harmonic line force. The elastic layer was found to outperform the limp layer due to the additional structural dissipation within the solid phase of the material. The effect of bonding a poro-elastic layer to the unconstrained panel was also studied. The panel was then made partially-constrained by adding two discontinuities with finite translational and rotational inertias. The constrained panel case was validated by comparison with a finite element model, and was also used to compare the damping loss factors of a limp porous layer and a poro-elastic layer. Insights and concepts are summarized for the design of a poro-elastic structural damper.
ISSN:0022-460X
1095-8568
DOI:10.1016/j.jsv.2019.114866