Progress of low-frequency sound absorption research utilizing intelligent materials and acoustic metamaterials

Chang, Longfei; Jiang, Ajuan; Rao, Manting; Ma, Fuyin; Huang, Haibo; Zhu, Zicai; Wu, Yucheng; Li, Bo; Hu, Ying

doi:10.1039/d1ra06493b

Cited by 26 publications

(10 citation statements)

References 129 publications

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“…Traditional porous materials, as previously indicated, have low densities, decent sound absorption capabilities, and excellent high frequency absorption capabilities; nevertheless, their middle and low frequency range sound absorption capabilities are weak [110,111]. Acoustic metamaterials can adjust the sound transmission through their own special structure, and they have good sound absorption or sound insulation performance in the low and medium frequency range, on the contrary, the sound absorption performance in the high frequency range is very poor [16,112]. Therefore, the composite structure made of porous materials and acoustic metamaterials is an efficient way to achieve broadband sound absorption and sound insulation in the practical application of noise reduction in order to extend the frequency range of noise reduction [113][114][115][116].…”

Section: Composite Structure Of Porous Materials and Acoustic Metamat...mentioning

confidence: 94%

Research progress of noise reduction of composite structures of porous materials and acoustic metamaterials

Huang,

Yang,

Talukder

et al. 2024

Phys. Scr.

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Noise pollution is an important problem affecting people's lives and work quality. In the current noise reduction materials, the porous sound absorption materials usually only haveagood sound absorption effect for medium and high -frequency sound waves, and the sound absorption effect for low -frequency sound waves is relatively weak. However, in recent years, the research on acoustic metamaterials has made a breakthrough which can effectively absorb or isolate low-frequency sound waves. Therefore, researchers propose to combine porous sound-absorbing materials with acoustic metamaterials to form a composite structure, that broadens the frequency range of noise reduction, so as to achieve the goal of full-frequency domain noise reduction. This paper first introduces the research progress of porous materials and acoustic metamaterials, and then introduces the research progress of composite structures that are made of porous materials and acoustic metamaterials. Finally, the application prospect of the composite field of porous sound-absorbing materials and acoustic metamaterials are summarized.

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Section: Composite Structure Of Porous Materials and Acoustic Metamat...mentioning

confidence: 94%

Research progress of noise reduction of composite structures of porous materials and acoustic metamaterials

Huang,

Yang,

Talukder

et al. 2024

Phys. Scr.

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“…For example, membrane absorbers [8][9][10] have been installed within a studio. [8,9,11] In comparison, metasurface absorbers with co-planar spiral tubes were demonstrated in laboratory, [12][13][14][15][16] but are still costly for installing over a larger area. The bandwidth of these ultra-low frequency absorbers is narrow and risks becoming ineffective when the noise spectrum drifts from the target.…”

Section: Introductionmentioning

confidence: 99%

Transformation from Helmholtz to Membrane Resonance by Electro‐Adhesive Zip of a Double‐Layer Micro‐Slit Acoustic Absorber

Loke

Lu³

et al. 2023

Adv Materials Technologies

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Road noise varies with the vehicles’ load and speed, ranging from low to medium frequencies. The existing absorbers, including acoustic metamaterials, cannot fully mitigate the variable noise due to limited bandwidth. To target the variable noise but not occupy much space, this paper presents a tunable acoustic absorber that can transform from Helmholtz resonance to membrane resonance. This tunable absorber consist of double micro‐slit layers, namely an electro‐adhesive membrane and a flexible plate spaced closely in front of a shallow cavity. The boundary‐layer thick gap between the two forms a network of lateral orifices to enhance the acoustic damping at medium frequencies. When the gap closes under electrostatic attraction force, the membrane and plate zipped together and resonated like a drum at a much lower frequency. This transformation can shift the resonant frequency down by 1.6 octaves from 898 hetz (Hz) to 281 Hz, thanks to the structural resonance of the zipped parts. Interestingly, the peak absorption coefficient at the lowest tuned 281 Hz was as high as 0.93. Such distributed tunability based on a fault‐tolerant electro‐adhesive membrane will also be applicable to other acoustic meta‐materials that embody the components of micro‐perforated or micro‐slit panels.

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“…[ 1 ] Taking sound absorption as an example, if porous sound absorption materials are used, the thickness is often required to exceed 1/4‐wavelength of the lowest working frequency for achieving effective absorption, that is, a very thick absorption structure is required to realize low‐frequency broadband sound absorption. [ 2 ] However, large surface density and thickness are unacceptable for aircraft, high‐speed train, ships, automobiles and other equipment that have severe restrictions on lightweight and size space. Therefore, the contradiction between low‐frequency noise attenuation and equipment compactness as well as lightweight is a key technical problem in the development of various high‐end equipment.…”

Section: Introductionmentioning

confidence: 99%

Ultrathin Space‐Shift Phase‐Coherent Cancellation Metasurface for Broadband Sound Absorption

Ma,

Zhang,

Wang

et al. 2023

Small Methods

Self Cite

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A space‐shift phase‐coherent cancellation acoustic metasurface is developed, which can achieve broadband low‐frequency sound absorption via ultra‐thin integrated structure composed of multiple units with weak absorption capability. Through a space‐shift design of the channel length, the large‐size required in the thickness direction for low‐frequency absorption is transferred into an extremely ultra‐thin space layer. The units with gradient channel length are compactly arranged in an ultra‐thin layer through space folding, a coplanar sound absorption metasurface component with working bandwidth exceeding an octave and thickness of only λ/25 to λ/57 is obtained. As the construction of a special double‐hole “bridge” layout, even if the elements are sparsely distributed, strong coupling interactions between the units can sustain. When a certain local phase relationship is satisfied, the coherent cancellation of sound energy can be achieved, so as to reduce the sound reflection and scattering, and enhance the absorption performance. Therefore, from the perspective of phase relationship among units, the present work provides more clear physical image and intuitive theoretical explanation for achieving excellent broadband sound absorption through parallel superposition of multiple units with weak absorption capability. The proposed ultra‐thin sound absorbing metasurface can satisfy the thickness limitations and absorption performance requirements in most equipment.

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Progress of low-frequency sound absorption research utilizing intelligent materials and acoustic metamaterials

Abstract: In this review, the latest progress of intelligent materials incorporated with acoustic metamaterials is summarized to provide an impetus for this highly interdisciplinary advancement towards low-frequency sound absorption.

Cited by 26 publications

References 129 publications

Research progress of noise reduction of composite structures of porous materials and acoustic metamaterials

Research progress of noise reduction of composite structures of porous materials and acoustic metamaterials

Transformation from Helmholtz to Membrane Resonance by Electro‐Adhesive Zip of a Double‐Layer Micro‐Slit Acoustic Absorber

Ultrathin Space‐Shift Phase‐Coherent Cancellation Metasurface for Broadband Sound Absorption

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