Low-frequency perfect sound absorption achieved by a modulus-near-zero metamaterial

Abstract We have analytically proposed a mechanism for achieving a perfect absorber by a modulus-near-zero (MNZ) metamaterial with a properly decorated imaginary part, in which the perfect absorption (PA) is derived from the proved destructive interference. Based on the analysis, an ultrathin acoustic metamaterial supporting monopolar resonance at 157 Hz (with a wavelength about 28 times of the metamaterial thickness) has been devised to construct an absorber for low-frequency sound. The imaginary part of its effective modulus can be easily tuned by attentively controlling the dissipative loss to achieve PA. Moreover, we have also conducted the experimental measurement in impedance tube, and the result is of great consistency with that of analytical and simulated ones. Our work provides a feasible approach to realize PA (>99%) at low frequency with a deep-wavelength dimension which may promote acoustic metamaterials to practical engineering applications in noise control.

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Hybrid acoustic metamaterial as super absorber for broadband low-frequency sound

Scientific Reports ◽

10.1038/srep43340 ◽

2017 ◽

Vol 7 (1) ◽

Cited By ~ 58

Author(s):

Yufan Tang ◽

Shuwei Ren ◽

Han Meng ◽

Fengxian Xin ◽

Lixi Huang ◽

...

Keyword(s):

Energy Dissipation ◽

Absorption Coefficient ◽

Sound Absorption ◽

Low Frequency ◽

Functional Materials ◽

Theoretical Method ◽

Acoustic Metamaterials ◽

Mechanical Stiffness ◽

Acoustic Metamaterial ◽

Frequency Sound

Abstract A hybrid acoustic metamaterial is proposed as a new class of sound absorber, which exhibits superior broadband low-frequency sound absorption as well as excellent mechanical stiffness/strength. Based on the honeycomb-corrugation hybrid core (H-C hybrid core), we introduce perforations on both top facesheet and corrugation, forming perforated honeycomb-corrugation hybrid (PHCH) to gain super broadband low-frequency sound absorption. Applying the theory of micro-perforated panel (MPP), we establish a theoretical method to calculate the sound absorption coefficient of this new kind of metamaterial. Perfect sound absorption is found at just a few hundreds hertz with two-octave 0.5 absorption bandwidth. To verify this model, a finite element model is developed to calculate the absorption coefficient and analyze the viscous-thermal energy dissipation. It is found that viscous energy dissipation at perforation regions dominates the total energy consumed. This new kind of acoustic metamaterials show promising engineering applications, which can serve as multiple functional materials with extraordinary low-frequency sound absorption, excellent stiffness/strength and impact energy absorption.

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A membrane-type acoustic metamaterial muffler

International Journal of Modern Physics B ◽

10.1142/s0217979217500497 ◽

2017 ◽

Vol 31 (08) ◽

pp. 1750049 ◽

Cited By ~ 3

Author(s):

Fang Wang ◽

Tianning Chen ◽

Xiaopeng Wang ◽

Kai Bao ◽

Lele Wan

Keyword(s):

Transmission Loss ◽

Low Frequency ◽

Acoustic Metamaterials ◽

Acoustic Transmission ◽

Frequency Range ◽

Transmission Performance ◽

Acoustic Metamaterial ◽

Dynamic Mass ◽

Membrane Type ◽

Theoretical Results

Membrane-type acoustic metamaterials (MAMs) with negative dynamic mass have demonstrated the effects in the sound transmission loss (STL) at low-frequency range. This research aims to design a membrane-type acoustic metamaterial muffler (MAMM) based on the present MAMs, and to solve the problem that airflow cannot flow unimpededly in the channel once using the MAMs. For a better understanding of MAMM, the resonance frequency of the membrane was calculated and simulation was used to study the acoustic transmission performance of the MAMM. The simulation results were verified in comparison with the theoretical results of the membrane. This MAMM reduced the structural size of muffler compared with the traditional Helmholtz muffler and expand muffler, which can find application for the MAMs in acoustic absorption and noise control.

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Theoretical Optimization of Trapped-Bubble-Based Acoustic Metamaterial Performance

Applied Sciences ◽

10.3390/app10165720 ◽

2020 ◽

Vol 10 (16) ◽

pp. 5720

Author(s):

Dmitry Gritsenko ◽

Roberto Paoli

Keyword(s):

Low Frequency ◽

Impedance Change ◽

Sound Waves ◽

Acoustic Metamaterials ◽

Resonant Frequencies ◽

Acoustic Metamaterial ◽

Precise Control ◽

Resonant Behavior ◽

Versatile Tool ◽

Analytical Expressions

Acoustic metamaterials have proven to be a versatile tool for the precise control and manipulation of sound waves. One of the promising designs of acoustic metamaterials employ the arrays of bubbles and find applications for soundproofing, blast mitigation, and many others. An obvious advantage of bubble-based metamaterials is their ability to be relatively thin while absorbing low-frequency sound waves. The vast majority of theories developed to predict resonant behavior of bubble-based metamaterials capitalize on Minnaert frequency. Here, we propose a novel theoretical approach to characterize bubble-based metamaterials that are based on our previous findings for a single bubble trapped in circular cavity modeled as a thin clamped plate. We obtain analytical expressions for resonant frequencies of bubble metascreens using self-consistent approximation. Two geometry factors, distance between bubble centers and distance between bubble center and interface of acoustic impedance change, are taken into account. We demonstrate the existence of multiple bandgaps and possibility of switching between them via adjustment of geometry parameters and reflector properties.

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Multi-mass synergetic coupling perforated bi-layer plate-type acoustic metamaterials for sound insulation

International Journal of Modern Physics B ◽

10.1142/s0217979220501362 ◽

2020 ◽

Vol 34 (13) ◽

pp. 2050136

Author(s):

Weikang Huang ◽

Tianning Chen ◽

Quanyuan Jiang ◽

Xinpei Song ◽

Wuzhou Yu ◽

...

Keyword(s):

Structural Parameters ◽

Perforated Plate ◽

Low Frequency ◽

Sound Insulation ◽

Frequency Noise ◽

Acoustic Metamaterials ◽

Practical Engineering ◽

Broadband Sound ◽

Insulation Performance ◽

Plate Type

Thin plate-type acoustic metamaterials have the advantages of lightweight, high rigidity and adjustable parameters, showing great practical application values in sound wave control. In this paper, a type of perforated bi-layer plate-type acoustic metamaterials (PBPAM) is designed for low-frequency noise control. The sound insulation peaks can be increased by combining the perforated plate and synergetic masses, making the sound insulation performance close to the mass law at the resonant frequency. Compared to the results predicted by the mass law, a better performance of sound insulation is achieved based on the PBPAM. The effects of the structural parameters are investigated in this study. Based on the impedance tube experiments, the measured results have a good agreement with the simulated ones. This work can provide a reference for low-frequency and broadband sound insulation based on plate-type acoustic metamaterials in practical engineering.

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Performance of a Multifunctional Spiral Shaped Acoustic Metamaterial With Synchronized Low-Frequency Noise Filtering and Energy Harvesting Capability

ASME 2020 Conference on Smart Materials, Adaptive Structures and Intelligent Systems ◽

10.1115/smasis2020-2264 ◽

2020 ◽

Author(s):

Fariha Mir ◽

Sourav Banerjee

Keyword(s):

Energy Harvesting ◽

Electromagnetic Radiation ◽

Smart Materials ◽

Strain Energy ◽

Low Frequency ◽

Dual Function ◽

Frequency Noise ◽

Noise Filtering ◽

Acoustic Metamaterials ◽

Acoustic Metamaterial

Abstract Metamaterials are man-made materials that behave uniquely and possess exclusively desired properties that are not found in natural materials. Usually, it is the combination of two or more materials and can be engineered to perform tasks that are not possible with traditional materials. These were initially discovered while working with electromagnetic radiation. Apart from electromagnetic radiation, metamaterials are also capable of affecting the wave propagation characteristics through any fluid such as air. These metamaterials are called acoustic metamaterials. Many acoustic metamaterials have gone beyond its definition but still, characterize the waveguiding properties. Incorporation of smart materials while constructing acoustic metamaterial, can achieve multifunctionality of the design. A prospective application field for such acoustic metamaterials is energy harvesting from low-frequency vibration. It is conceptualized that acoustic metamaterials can be used as noise barrier materials to filter roadside and industrial noise. This application can get extended to the aerospace application where engine noise mitigation inside the cabin is a challenge. In this article, a spiral-shaped acoustic metamaterial is modeled which has a dual function of noise filtering and energy harvesting. This acoustic metamaterial has a comparatively high reflection coefficient closer to the anti-resonance frequencies, resulting in high sound transmission loss. The filtered noise is trapped inside the cell in the form of strain energy. Hence, we claim that if the trapped energy which is any way wasted in the material could be harvested to power the local electronic devices, the new solution could make transformative for the 21st century’s green energy solution. Calculated placement of smart materials in the cell-matrix can help to extract the strain energy in the form of power. The acoustic metamaterial cell presented in this work has the capability of isolating noise and reducing diffraction by trapping sound in low frequencies and at the same time recover the trapped abundant energy in the form of electrical potential using piezoelectric materials. The spiral design is sensitive to vibration due to trampoline shaped attachments inside the cell. This makes it capable of harvesting energy using vibration also. This is a promising acoustoelastic metamaterial with multifunctionality properties for future applications.

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A Review of Acoustic Metamaterials and Phononic Crystals

Crystals ◽

10.3390/cryst10040305 ◽

2020 ◽

Vol 10 (4) ◽

pp. 305 ◽

Cited By ~ 1

Author(s):

Junyi Liu ◽

Hanbei Guo ◽

Ting Wang

Keyword(s):

Physical Properties ◽

Negative Refraction ◽

Phononic Crystals ◽

Acoustic Properties ◽

Acoustic Metamaterials ◽

Acoustic Metamaterial ◽

Great Progress ◽

Practical Engineering ◽

Promising Application ◽

Made In

As a new kind of artificial material developed in recent decades, metamaterials exhibit novel performance and the promising application potentials in the field of practical engineering compared with the natural materials. Acoustic metamaterials and phononic crystals have some extraordinary physical properties, effective negative parameters, band gaps, negative refraction, etc., extending the acoustic properties of existing materials. The special physical properties have attracted the attention of researchers, and great progress has been made in engineering applications. This article summarizes the research on acoustic metamaterials and phononic crystals in recent decades, briefly introduces some representative studies, including equivalent acoustic parameters and extraordinary characteristics of metamaterials, explains acoustic metamaterial design methods, and summarizes the technical bottlenecks and application prospects.

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Narrow-dual-band perfect absorption plasmonic sensor in metamaterials based on the coupling of two resonators

Journal of Nonlinear Optical Physics & Materials ◽

10.1142/s0218863516500272 ◽

2016 ◽

Vol 25 (03) ◽

pp. 1650027 ◽

Cited By ~ 6

Author(s):

Ruiping Bai ◽

Xing Ri Jin ◽

Ying Qiao Zhang ◽

Shou Zhang ◽

Youngpak Lee

Keyword(s):

High Frequency ◽

Low Frequency ◽

Peak Position ◽

Dual Band ◽

Resonant Peak ◽

Perfect Absorber ◽

Plasmonic Sensor ◽

Perfect Absorption ◽

Metal Insulator Metal ◽

Sensitive Sensor

We propose a narrow-dual-band metamaterial perfect absorber (MPA) made of metal-insulator-metal multilayer composite based on the coupling of two resonators. The absorptance of dual resonant peak all exceeding 95% at [Formula: see text][Formula: see text]nm and 98% at [Formula: see text][Formula: see text]nm ([Formula: see text] is the length of ‘left’–‘right’ pair), respectively, where the full absorption width at half-maximum is about 3% (low frequency) and 5% (high frequency). The narrow distance of dual resonant peak is 31.4[Formula: see text]THz together with 43.6[Formula: see text]THz when [Formula: see text][Formula: see text]nm and 290[Formula: see text]nm, respectively. In addition, we demonstrate that the MPA can work as a sensitive sensor for refractive index sensing. The figure of merit FOM* reaches 197.7 (low frequency) and 274.8 (high frequency) when [Formula: see text][Formula: see text]nm. The narrow-dual-band peak position can be controlled by changing [Formula: see text] as well.

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Experimental Study of the Transmission Spectrum of a Sonic/Ultrasonic Acoustic Metamaterial

Volume 13: Acoustics, Vibration, and Wave Propagation ◽

10.1115/imece2016-67140 ◽

2016 ◽

Author(s):

Yanbo He ◽

Jeffrey S. Vipperman

Keyword(s):

Band Gap ◽

Frequency Band ◽

Transmission Spectrum ◽

Physical Phenomenon ◽

Experimental Studies ◽

Low Frequency ◽

Acoustic Metamaterials ◽

Acoustic Metamaterial ◽

Potential Applications ◽

Lower Frequency Band

Acoustic metamaterials have received much attention recently. In the past decades, countless structures have been studied for their novel physical phenomenon or potential applications. The goals of many of the works were to explore ways to enlarge the band gap, lower the band gap frequency, and/or generate greater attenuation of vibration. However, most of the work was limited to simulation, with experimental studies rarer. In this work, we would like to experimentally present the transmission spectrum of an acoustic metamaterial with a proposed structure called the coated double hybrid lattice (CDHL) [1]. The CDHL has both crystalline structure and local resonators, which provide high-frequency and low-frequency band gaps, respectively. A structure was fabricated and tested to experimentally determine the transmission spectrum. Both, a higher frequency band gap and a lower frequency band gap, were obtained. Vibration is clearly attenuated in the frequency range of 70–90 kHz. This is due to the Bragg scattering effect. At the same time, around the frequency of 4.8kHz, another band gap is observed which is attributed to local resonance. It turns out that our experimental results coincide with our previous simulation quite well.

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