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Enhanced acoustic insulation properties of composite metamaterials having embedded negative stiffness inclusions

Chronopoulos, Dimitrios; Antoniadis, I.; Ampatzidis, Theofanis

Authors

I. Antoniadis

Theofanis Ampatzidis



Abstract

Despite the fact that the concept of incorporating Negative Stiffness (NS) elements within mechanical systems was formulated and validated more than 40 years ago, it has only recently received consistent attention. In this work, the design of a layered mechanical metamaterial having implemented NS inclusions is presented and its acoustic wave propagation properties are modelled. A dedicated two-dimensional periodic structure theory scheme is developed in order to compute the frequency dependent damping loss factor of the metamaterial structure. The acoustic transmission properties through the modelled panel are computed within a Statistical Energy Analysis (SEA) scheme. It is demonstrated that the suggested layered metamaterial exhibits highly superior acoustic insulation performance close and above the acoustic coincidence range, thanks to the drastic increase of its structural damping properties implied by the NS elements. Additionally, the proposed configuration presents superior performance in a broadband frequency range when compared to a viscoelastic damping constraint layer of equivalent mass.

Journal Article Type Article
Publication Date Apr 30, 2017
Journal Extreme Mechanics Letters
Electronic ISSN 2352-4316
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 12
APA6 Citation Chronopoulos, D., Antoniadis, I., & Ampatzidis, T. (2017). Enhanced acoustic insulation properties of composite metamaterials having embedded negative stiffness inclusions. Extreme Mechanics Letters, 12, https://doi.org/10.1016/j.eml.2016.10.012
DOI https://doi.org/10.1016/j.eml.2016.10.012
Keywords Mechanical Metamaterials, Wave Propagation, Negative Stiffness, Composite Structures, Damping
Publisher URL http://www.sciencedirect.com/science/article/pii/S2352431616300487
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0





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