Membrane- and plate-type acoustic metamaterials with elastic unit cell edges

Langfeldt, F.; Gleine, W.

doi:10.1016/j.jsv.2019.04.018

Cited by 55 publications

(30 citation statements)

References 30 publications

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“…Langfeldt et al developed an effective analytical model to predict the eigenmode and sound transmission losses of thin-plate metamaterials. [108] In this model, the Euler-Bernoulli beam mesh was used to describe the edge of the elastic element, and the sound transmission loss at oblique incidence was calculated. A comparison with finite element simulations showed that the proposed model achieves the same results, but significantly reduces the calculation workload.…”

Section: Passive Sound-insulation Metamaterialsmentioning

confidence: 99%

Acoustic Metamaterials for Noise Reduction: A Review

Gao

Zhang

Deng

et al. 2022

Adv Materials Technologies

258

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Noise pollution has become a significant global problem in recent years. Unfortunately, conventional acoustic materials cannot offer substantial improvements in noise reduction. However, acoustic metamaterials are providing new solutions for controlling sound waves, and have huge potential for mitigating noise propagation in particular. Recently, owing to the rapid development of acoustic metamaterials, metamaterials for acoustic noise reduction have drawn the attention of researchers worldwide. These metamaterials are often both light and compact, and are excellent at reducing low‐frequency noise, which is difficult to control with conventional acoustic materials. Recent progress has illustrated that acoustic metamaterials effectively control sound waves, and optimizing their structure can enable functionality based on new physical phenomena. This review introduces the development of acoustic metamaterials, and summarizes the basic classification, underlying physical mechanism, application scenarios, and emerging research trends for both passive and active noise‐reduction metamaterials. Focusing on noise reduction, the shortcomings of current technologies are discussed, and future development trends are predicted. As our knowledge in this area continues to expand, it is expected that acoustic metamaterials will continue to improve and find more practical applications in emerging fields in the future.

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Section: Passive Sound-insulation Metamaterialsmentioning

confidence: 99%

Acoustic Metamaterials for Noise Reduction: A Review

Gao

Zhang

Deng

et al. 2022

Adv Materials Technologies

258

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“…The acoustic metamaterials proposed in the literature are mostly in a plate-like form with intrinsic [14,15] or extrinsic [16,17] resonant structures. More specifically speaking, intrinsic metamaterial has the resonant substructure built inside the plate-like structure while the extrinsic one has the resonant substructure appended on the base plate.…”

Section: Introductionmentioning

confidence: 99%

Design and noise-reduction simulation of an acoustic metamaterial plate incorporating tunable shape memory cantilever absorbers

Xu¹,

Wu²,

Lee³

2022

J. vibroeng.

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Metamaterials are materials having artificially tailored internal structure and unusual physical and mechanical properties. Due to their unique characteristics, metamaterials possess great potential in engineering applications. This study proposes a tunable metamaterial for the applications in acoustic isolation. Therefore, a stopband in the dispersion curve can be created because of the energy gap. For the conventional metamaterial, the stopband is fixed. Although the metamaterial with tunable characteristics has been proposed in the literature to extend its working stopband, the efficacy is usually compromised. In this study, cantilevers of tunable shape memory materials (SMM) via controlled phase transformation are incorporated into the metamaterial plate. Its theoretical finite element formulation for determining the dynamic characteristics is established. The effect of the configuration of the SMM cantilever absorbers on the metamaterial plate for the desired stopband in wave propagation is simulated by using finite element model and a commercial multi-physics software. The result demonstrates the tunable capability on the stopband of the metamaterial plate under different activation controls of the SMM absorbers, and shows the ability to trap the vibration at the designed frequency and prevent vibration wave from propagating downstream in different absorber arrangements and alloy phases. It should be beneficial to precision machinery and defense industries which have desperate need in vibration and noise isolation.

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“…The MAMs are formed by low surface mass density unit cells. A unit cell is composed of a pre-stressed elastic membrane with attached mass platelet, and a rigid frame on which the membrane is fixed [16]. This particular configuration has the advantages of being light-weight, easy to manufacture and relatively low cost.…”

Section: Introductionmentioning

confidence: 99%

“…Figure16. The frequency responses of the metamaterial plate with 60mm (black dashed) and 120mm (red solid) periodicity.…”

mentioning

confidence: 99%

Study of bandgap property of a bilayer membrane-type metamaterial applied on a thin plate

Gao

Halim

2020

International Journal of Mechanical Sciences

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This work is aimed to study the bandgap property of a thin plate structure with periodically attached bilayer membrane-type resonators. An analytical method based on the Plane Wave Expansion (PWE) method combined with the Rayleigh method, is proposed to predict the bandgap property of bilayer membrane-type metamaterials. The accuracy of the proposed method is verified by the finite element analysis, and a parametric analysis is conducted to reveal the effect of parameters on the bandgap performance. It is found that such a metamaterial can generate two separated bandgaps through the contribution of its two layers of membranes. It is observed that the increase of membrane tensile stress or the magnitude of attached mass can lead to the broadening of bandgaps, whilst the change of unit cell's periodicity has the opposite effect. In addition, if compared with the corresponding single layer membrane-type metamaterials, it is shown that the bilayer membranetype's first bandgap is suppressed while the second one is extended. However, by applying proper membrane tensile stress and mass magnitude, the suppression of the first bandgap can be weakened whilst allowing the tuning of the bandgap location. These characteristics reveal the benefits of using bilayer membrane-type metamaterial as it possesses higher agility in bandgap tuning. The proposed method can provide an effective tool for the bilayer membrane-type metamaterial design and optimisation.

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Membrane- and plate-type acoustic metamaterials with elastic unit cell edges

Cited by 55 publications

References 30 publications

Acoustic Metamaterials for Noise Reduction: A Review

Acoustic Metamaterials for Noise Reduction: A Review

Design and noise-reduction simulation of an acoustic metamaterial plate incorporating tunable shape memory cantilever absorbers

Study of bandgap property of a bilayer membrane-type metamaterial applied on a thin plate

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