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Article

Spider Web-Inspired Lightweight Membrane-Type Acoustic Metamaterials for Broadband Low-Frequency Sound Isolation

1
School of Aeronautics, Northwestern Polytechnical University, Xi’an 710072, China
2
Aircraft Strength Research Institute, Aviation Industries of China, Xi’an 710072, China
3
Department of Mechanical Engineering, College of Engineering, King Khalid University, P.O. Box 394, Abha 61421, Saudi Arabia
*
Author to whom correspondence should be addressed.
Academic Editor: Francisco Javier Espinach Orús
Polymers 2021, 13(7), 1146; https://doi.org/10.3390/polym13071146
Received: 10 March 2021 / Revised: 27 March 2021 / Accepted: 29 March 2021 / Published: 2 April 2021
(This article belongs to the Special Issue Polymer and Polymer Composites, Thermal and Acoustic Applications)
Membrane-type acoustic metamaterial (MAM) has exhibited superior sound isolation properties, as well as thin and light characteristics. However, the anti-resonance modes of traditional MAMs are generated intermittently in a wide frequency range causing discontinuities in the anti-resonance modes. Achieving broadband low-frequency sound attenuation with lightweight MAM design is still a pivotal research aspect. Here, we present a strategy to realize wide sound-attenuation bands in low frequency range by introducing the design concept of bionic configuration philosophy into the MAM structures. Built by a polymeric membrane and a set of resonators, two kinds of MAM models are proposed based on the insight of a spider web topology. The sound attenuation performance and physical mechanisms are numerically and experimentally investigated. Multi-state anti-resonance modes, induced by the coupling of the bio-inspired arrangement and the host polymer film, are systematically explored. Significant sound attenuation is numerically and experimentally observed in both the lightweight bio-inspired designs. Remarkably, compared with a traditional MAM configuration, a prominent enhancement in both attenuation bandwidth and weight-reduction performance is verified. In particular, the bio-inspired MAM Model I exhibits a similar isolation performance as the reference model, but the weight is reduced by nearly half. The bio-inspired Model II broadens the sound attenuation bandwidth greatly; meanwhile, it retains a lighter weight design. The proposed bio-inspired strategies provide potential ways for designing sound isolation devices with both high functional and lightweight performance. View Full-Text
Keywords: membrane-type acoustic metamaterials; bio-inspired structures; polymeric membrane; anti-resonance; low-frequency sound isolation; sound transmission loss membrane-type acoustic metamaterials; bio-inspired structures; polymeric membrane; anti-resonance; low-frequency sound isolation; sound transmission loss
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MDPI and ACS Style

Huang, H.; Cao, E.; Zhao, M.; Alamri, S.; Li, B. Spider Web-Inspired Lightweight Membrane-Type Acoustic Metamaterials for Broadband Low-Frequency Sound Isolation. Polymers 2021, 13, 1146. https://doi.org/10.3390/polym13071146

AMA Style

Huang H, Cao E, Zhao M, Alamri S, Li B. Spider Web-Inspired Lightweight Membrane-Type Acoustic Metamaterials for Broadband Low-Frequency Sound Isolation. Polymers. 2021; 13(7):1146. https://doi.org/10.3390/polym13071146

Chicago/Turabian Style

Huang, Heyuan, Ertai Cao, Meiying Zhao, Sagr Alamri, and Bing Li. 2021. "Spider Web-Inspired Lightweight Membrane-Type Acoustic Metamaterials for Broadband Low-Frequency Sound Isolation" Polymers 13, no. 7: 1146. https://doi.org/10.3390/polym13071146

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