Lightweight sound-absorbing metastructures with perforated fish-belly panels

Jin, Yabin; Yang, Yilong; Wen, Zhihui; He, Liangshu; Cang, Yu; Yang, Bin; Djafari‐Rouhani, Bahram; Li, Yong

doi:10.1016/j.ijmecsci.2022.107396

Cited by 37 publications

(6 citation statements)

References 68 publications

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“…With typical strongly enhanced acoustic fields and subwavelength structural scale, the initial designs of sound-absorbing metamaterials are remarkably efficient for narrow-band performances [17][18][19][20][35][36][37][38][39]. In pursuit of broadband sound absorption/attenuation, an efficient approach is to combine a series of component acoustic absorbers operating at different frequencies [31,34,[40][41][42][43][44][45][46][47][48][49][50][51][52]. Despite the fascinating achievements of high-efficiency broadband sound absorption/attenuation, it still remains a significant gap in the realization of timbre manipulation since timbre manipulation puts higher demands on the frequency-selective and delicate modulation of resonances in broadband.…”

Section: Introductionmentioning

confidence: 99%

Meta-silencer with designable timbre

Wang

Zhou

Qiu

et al. 2023

Int. J. Extrem. Manuf.

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Timbre, as one of the essential elements of sound, plays an important role in determining sound properties, whereas its manipulation has been remaining challenging for passive mechanical systems due to the intrinsic dispersion nature of resonances. Here, we present a meta-silencer supporting intensive mode density as well as highly tunable intrinsic loss and offering a fresh pathway for designable timbre in broadband. Strong global coupling is induced by intensive mode density and delicately modulated with the guidance of the theoretical model, which efficiently suppresses the resonance dispersion and provides desirable frequency-selective wave-manipulation capacity for timbre tuning. As proof-of-concept demonstrations for our design concepts, we propose three meta-silencers with the designing targets of high-efficiency broadband sound attenuation, efficiency-controlled sound attenuation and designable timbre, respectively. The proposed meta-silencers all operate in a broadband frequency range from 500 to 3200 Hz and feature deep-subwavelength sizes around 50 mm. Our work opens up a fundamental avenue to manipulate the timbre with passive resonances-controlled acoustic metamaterials and may inspire the development of novel multifunctional devices in noise-control engineering, impedance engineering, and architectural acoustics.

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Section: Introductionmentioning

confidence: 99%

Meta-silencer with designable timbre

Wang

Zhou

Qiu

et al. 2023

Int. J. Extrem. Manuf.

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“…For airborne sound, the constraints of the causality principle dictate that the thickness of the sample must satisfy the following relationship [22] : 1 where is the bulk modulus of air, is the effective bulk modulus of the sample and represents the absorption spectrum with respect to the wavelength . Numerous researchers have attempted to achieve subwavelength acoustic structure design within the con nes of the minimum thickness limit [23][24][25][26][27][28][29][30][31][32][33][34] . Recently, Mak et al [35] used a soft boundary to circumvent the minimum thickness…”

Section: Introductionmentioning

confidence: 99%

Deep Subwavelength Broadband Sound Absorption by a Buckled Plate Resonator

Han

Xing

2023

Preprint

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The absorption performance and the sample thickness need to satisfy the causal relation, and the sound absorption bandwidth of a thin layer structure is often very narrow to achieve high sound absorption at low frequency. In this paper, a buckled plate resonator is proposed to achieve the low frequency broadband sound absorption in the deep subwavelength range. The resonator consists of an air-tight back cavity sealed by an elastic circular thin plate. A uniform in-plane compressive force is applied on the thin plate to make the plate buckling produce negative stiffness, and the resonator operates in the pre-buckling state. By adjusting the structural stiffness, the buckled plate resonator achieves the purpose of adjusting Beff and B0, which weakens the causal principle requirement of minimum acoustic structure thickness and realizes broadband low-frequency sound absorption. The final experimental results show that one 3mm(λ/220) back cavity, 0.89 sound absorption is achieved at 515Hz, and the corresponding relative sound absorption bandwidth is 19.4%. From the causal relation, the calculated minimum sample thickness is 6.7mm for the observed absorption spectrum. Compared with traditional plate-type acoustic metamaterials, which achieve low-frequency sound absorption by increasing the mass, the absorption bandwidth is too narrow due to the influence of the quality factor Qm, our work provides a design paradigm for the low frequency broadband acoustic absorbers.

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“…Shahsavari et al [39] presented an analytical study on the sound wave propagation across a sandwich cylindrical shell with a corrugated core filled with porous materials and investigated the vibroacoustic effects of various parameters, such as porosity, types of the porous materials, the thickness of the corrugated core, the structural damping factor, the incident angle, and the Mach number of the external flow. Jin et al [40] proposed a perforated meta-structure combining fish-belly panels and a corrugated sandwich structure for broadband sound absorption and developed an effective impedance theory to study the relationship between sound absorption performance and geometric factors. Luo et al [41] designed 49 kinds of aramid honeycomb sandwich panels by the orthogonal test method and tested their sound insulation properties, and furthermore predicted the sound insulation performance of aramid honeycomb sandwich panels based on artificial neural network.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigations of the Vibration and Acoustic Properties of Corrugated Sandwich Composite Panels

et al. 2022

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To explore the lightweight structures with excellent vibration and acoustic properties, corrugated composite panels with different fiber reinforcements, i.e., carbon and glass fibers, were designed and fabricated using a modified vacuum-assisted resin infusion (VARI) process. The vibration and sound transmission loss (STL) of the corrugated composite panels were investigated via mode and sound insulation tests, respectively. Meanwhile, finite element models were proposed for the verification and in-depth parametric studies. For the vibration properties of the corrugated composite panels, the results indicated that the resin layer on the panel surface, despite the extremely low thickness, showed a significant effect on the low-order bend modes of the entire structure. In addition, the difference in the mode frequency between the panels consisting of different fiber types became more and more apparent with the increase of the frequency levels. For the sound insulation property of the panel, the initial frequency of the panel’s resonant sound transmission can be conveniently increased by increasing the layer thickness of surface resin, and the fraction of fiber reinforcements is the most predominant factor for the sound insulation property, which was significantly improved by increasing the thickness of the fiber cloth. This work can provide fundamental support for the comprehensive design of vibration and acoustics of the composite sandwiched panel.

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Lightweight sound-absorbing metastructures with perforated fish-belly panels

Cited by 37 publications

References 68 publications

Meta-silencer with designable timbre

Meta-silencer with designable timbre

Deep Subwavelength Broadband Sound Absorption by a Buckled Plate Resonator

Experimental and Numerical Investigations of the Vibration and Acoustic Properties of Corrugated Sandwich Composite Panels

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