2021
DOI: 10.1063/5.0042514
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Wave trapping by acoustic black hole: Simultaneous reduction of sound reflection and transmission

Abstract: Reduction of vibration and sound energy in the form of traveling waves is of vital importance in many applications. Recent development of acoustic metamaterials opens up unusual ways for sound wave manipulation and control. Among acoustic metamaterials, a much newer concept, Acoustic Black Hole (ABH), has been drawing growing attention in recent years, which shows great potential for acoustic energy trapping and dissipation. In a duct ABH with a properly tailored continuous cross-sectional reduction and impeda… Show more

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Cited by 67 publications
(25 citation statements)
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“…The Bayesian backpropagation training was scripted with the aid of functions from the Deep Learning Toolbox from Matlab. Finite element modeling for sound absorption and structural analysis were performed References used for deriving the chart include the following: perforated panels, [3] advanced structures, [9][10][11][12][13] microlattices from literature, [21][22][23][24][25] and advanced foams. [4][5][6][7][8]…”
Section: Methodsmentioning
confidence: 99%
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“…The Bayesian backpropagation training was scripted with the aid of functions from the Deep Learning Toolbox from Matlab. Finite element modeling for sound absorption and structural analysis were performed References used for deriving the chart include the following: perforated panels, [3] advanced structures, [9][10][11][12][13] microlattices from literature, [21][22][23][24][25] and advanced foams. [4][5][6][7][8]…”
Section: Methodsmentioning
confidence: 99%
“…In turn, structure-based absorbers are more robust and notable successes have been achieved with superior absorption capabilities and broadened absorption range shown. Examples of novel absorbing structures investigated include the Fabry-Perot channel assembly, [9] planar coiled tubes, [10] perforated composite resonators, [11] membrane structures, [12] and shrinking duct structures, [13] etc. Despite the success, the mentioned examples nonetheless are still limited to a structural level-they lack the design flexibilities for an overall system or product.As such, it would be of high research interests to design absorbers based on the principles of structural designs, but yet to down-scale them to a size domain in the range of materials.…”
mentioning
confidence: 99%
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“…[1][2][3][4][5] The advent of additive manufacturing (AM) has brought a new research foams and fabrics are structurally non-rigid. Research efforts have been placed on the discovery of novel sound absorbers, for instance, metastructures such as the labyrinthine, [23] coiledup, [24] heterogeneous channels, [25] membrane, [26] and black hole structures; [27] or advanced materials such as aerogel [28] and graphene foams. [29] The limitations of the former include them being limited to solely a structure, whilst that of the latter being structurally soft and posing human-health hazards.…”
Section: Introductionmentioning
confidence: 99%
“…When the end is open, the Sound Transmission Loss (STL) at high frequency can reach more than 30 dB and even has good sound absorption performance. However, there is a large reflection at low frequency, and the STL is also lower than 10 dB (Mi et al, 2021;Zhang and Cheng, 2021). Many studies have been conducted on sound absorption and insulation in view of acoustics.…”
Section: Introductionmentioning
confidence: 99%