A 3D space coiling metamaterial with isotropic negative acoustic properties

Fu, Xinmin; Li, G. Y.; Lu, M.; Lu, Guoxing; Huang, Xiaodong

doi:10.1063/1.5005553

Cited by 17 publications

(22 citation statements)

References 28 publications

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“…Theoretical models can determine the configurations or assemblies in which AMMs and PCs are put together, and there are several approaches to achieve them physically. Bonding through the use of adhesives, such as glues and epoxies, is an accessible method to fabricate heterogeneous (e.g., membrane-type structures) or homogenous [43] structures. For example, Popa and Cummer [148] developed a nonreciprocal and highly nonlinear AMM consisting of a thin piezoelectric membrane (PZM) bonded between Helmholtz cavities, as an actively controlled unidirectional metamaterial (isolation factor > 10 dB).…”

Section: Arrangement and Assembly Methodsmentioning

confidence: 99%

“…Bandgaps that forbid acoustic transmission are formed through multiple scattering and the interference of propagating waves. Other types of AMMs may not operate through resonance but by coiling space in labyrinthine structures ( Figure 1e) [42,43] or waveguiding using origami-based structures (Figure 1f ). [44][45][46] AMM design generally revolves around the parameters of effective mass density (ρ) and bulk modulus (K ), [31] where they can be singly negative (either ρ < 0 or K < 0) or doubly negative (both ρ < 0 and K < 0), depending on the type of structure.…”

Section: Types Of Structuresmentioning

confidence: 99%

“…In single-step fabrication, only one process (besides postprocessing) is undertaken to fabricate either a full AMM or PC or parts of it for further assembly. 3D printing and machining are the most standard techniques for this purpose, ideal for producing designs involving Helmholtz resonators, [72,73] labyrinthine structures, [42,43,74,75] and periodic lattices. [76,77] These techniques are accessible, cost effective, and simple to use.…”

Section: Single-step Fabricationmentioning

confidence: 99%

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Fabricating and Assembling Acoustic Metamaterials and Phononic Crystals

et al. 2020

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Acoustic metamaterials (AMMs) and phononic crystals (PCs) have garnered significant attention in recent years, as part of the collective driving force toward creating intelligent acoustic devices. Advancements in these fields have greatly enhanced the way we manipulate sound waves through transmission, reflection, refraction, absorption, diffraction, or attenuation. In the past decade, AMMs and PCs have enabled novel applications such as acoustic lensing, [1-3] cloaking, [4] levitation, [5] and holography. [6-8] While these exotic structures have been well explored through theoretical and numerical analysis, [9-13] their physical realization is an important topic that is rarely discussed. Considering the ubiquity of sound and the powerful capabilities of AMMs and PCs, the impact of these acoustic structures could be phenomenal. Across the full acoustic frequency spectrum, practical applications such as noise cancellation, [14] underwater detection, [15] medical imaging, [16] and energy harvesting [17,18] could benefit key sectors in our society like healthcare, well-being, environmental sustainability, and security. Moreover, AMMs and PCs can help to usher in next-generation technologies for personalized, immersive multisensory [19-22] experiences. The manipulation of sound can enrich the way we communicate and interact with our surroundings, not simply through audio, but also through tactile sensations. In the future, AMMs and PCs could be used in virtual reality (VR) setups, [23] compact wearable devices, and dynamic midair volumetric displays [24] that are controllable and capable of providing haptic feedback. [25] Beyond the notion that AMMs and PCs can replace phased arrays, they could readily complement one another for more precise control. In commercial devices, AMM and PC functionalities could even be combined together in different ways, e.g., transmissive and sound absorptive structures, for improved performance. To unlock the full potential of AMMs and PCs, it is therefore vital to ensure that practical, physical realization is pursued alongside theoretical investigation in the development of viable acoustic designs. Building an AMM or PC requires some form of fabrication or assembly or both. Fabrication refers to the technologies and processes used to manufacture an object, whereas assembly refers to the strategic amalgamation of parts for a constructive purpose.

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Section: Arrangement and Assembly Methodsmentioning

confidence: 99%

Section: Types Of Structuresmentioning

confidence: 99%

Section: Single-step Fabricationmentioning

confidence: 99%

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Fabricating and Assembling Acoustic Metamaterials and Phononic Crystals

et al. 2020

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“…To achieve better control of low-frequency and broadband acoustic waves, researchers introduce the space-coiling method into acoustic metamaterials and design acoustic metamaterials with high refractive indexes, multiple vibration modes, and extraordinary acoustic properties, thus providing a new method to achieve broadband control of acoustic waves with a single structural unit [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36]. e extraordinary properties of these space-coiling acoustic metamaterials have attracted extensive research attention.…”

Section: Introductionmentioning

confidence: 99%

Labyrinthine Structure with Subwavelength and Broadband Sound Insulation

Jiang

Liu

et al. 2020

Shock and Vibration

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In this text, the combination of spiral structure and zigzag channels is introduced to design labyrinthine structures, in which sound waves can propagate alternately in the clockwise and counterclockwise directions. Finite element method and S-parameter retrieval method are used to calculate band structures, effective parameters, and transmission properties of the structures. The influences of different structural parameters on their acoustic properties are also studied. These results show labyrinthine structures have multiple bandgaps in the range of 0 Hz–1000 Hz, and the proportion of bandgaps exceeds 33%, which indicates labyrinthine structures have good broadband properties. The normalized frequency of the lowest bandgaps is far smaller than 1, which indicates the structures take good control of sound waves on subwavelength scale. Combining units with different structural parameters can achieve better sound insulation. This research provides a new kind of space-coiling structure for low-frequency and broadband sound waves control, which have excellent application prospects.

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“…1 Given the mass density law, the acoustic metamaterials possessing unique characteristics provide a good strategy in low-frequency sound attenuation without requiring excessive heavy bulk. 2,3 Acoustic metamaterials are artificial sub-wavelength structures with unconventional dynamic properties and remarkable functionalities, such as phononic bandgap, 4,5 acoustic focusing, [6][7][8] acoustic cloaking, [9][10][11] sound tunneling, 11,12 etc. One of the most impressive features is the sound forbidden-band ability with Bragg-scattering and/or local resonance to achieve low-frequency sound attenuation.…”

mentioning

confidence: 99%

3D Hilbert fractal acoustic metamaterials: low-frequency and multi-band sound insulation

Man

Xia

Luo

et al. 2019

J. Phys. D: Appl. Phys.

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In this letter, we present a class of three-dimensional (3D) labyrinthine acoustic metamaterials with self-similar fractal technique, which can produce multiple frequency-band sound insulation in deep-subwavelength scale. By simultaneously exploiting the multi-frequency bandgaps and the low-frequency characteristics, the Hilbert cubes are explored to design the 3D Hilbert fractal acoustic metamaterials (HFAMs). The multiple-band features of the HFAMs are examined by the finite element method and the effective medium theory, in which the negative bulk modulus and the mass density are responsible for the formation of the multi-bandgaps. These multi-frequency properties are induced by the Fabry-Perot multi-resonance of 3D HFAMs, which possess an ultra-high refractive index. Hence, the multi-band sound insulations of 3D HFAMs with the negative effective property are achieved below 500Hz. These properties of the designed 3D HFAMs provide an effective way for acoustic metamaterials to achieve multi-band filtering and noise attenuation in the low-frequency regime.

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A 3D space coiling metamaterial with isotropic negative acoustic properties

Cited by 17 publications

References 28 publications

Fabricating and Assembling Acoustic Metamaterials and Phononic Crystals

Fabricating and Assembling Acoustic Metamaterials and Phononic Crystals

Labyrinthine Structure with Subwavelength and Broadband Sound Insulation

3D Hilbert fractal acoustic metamaterials: low-frequency and multi-band sound insulation

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