Cochlear bionic acoustic metamaterials

Ma, Fuyin; Wu, Jiu Hui; Huang, Meng; Fu, Gang; Bai, Changan

doi:10.1063/1.4902869

Cited by 38 publications

(25 citation statements)

References 31 publications

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“…The result suggested that the vibration modes of the rubber membrane with 0.1 mm thickness be very intensive, with only about 0.1 Hz interval and mainly the Z-direction vibration mode, which also corresponds to the results of Figure 5. Since the rigidity of membrane in the literature was small, the membrane modes are dense under the low vibration frequency, and such a property can reach to the extreme in mammalian cochlea [19]. With the film thickness increasing to 0.5 mm, although the vibration modes stay intense, the average interval is larger than 10 Hz.…”

Section: -P5mentioning

confidence: 98%

“…However, it is difficult to put the structures with excellent vibration reduction ability in the thickness direction into the applications of the vibration and noise reduction for aircrafts and automobiles due to the oversize mass. Numerous researches have been conducted for a e-mail: ejhwu@mail.xjtu.edu.cn the important applications of the acoustic metamaterials in low-frequency noise and vibration reduction [17][18][19][20][21]. Particularly, a membrane-type acoustic metamaterials with a dynamic negative mass had been proposed in 2008 [22], and the oblique incidence acoustic absorptivity, especially in the range of 100-1000 Hz, was tested by the standing impedance tube method, which provided a new solution for engineering vibration and noise reduction [23,24].…”

Section: Introductionmentioning

confidence: 99%

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Resonant modal group theory of membrane-type acoustical metamaterials for low-frequency sound attenuation

Huang

2015

Eur. Phys. J. Appl. Phys.

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In order to overcome the influence of the structural resonance on the continuous structures and obtain a lightweight thin-layer structure which can effectively isolate the low-frequency noises, an elastic membrane structure was proposed. In the low-frequency range below 500 Hz, the sound transmission loss (STL) of this membrane type structure is greatly higher than that of the current sound insulation material EVA (ethylene-vinyl acetate copo) of vehicle, so it is possible to replace the EVA by the membranetype metamaterial structure in practice engineering. Based on the band structure, modal shapes, as well as the sound transmission simulation, the sound insulation mechanism of the designed membrane-type acoustic metamaterials was analyzed from a new perspective, which had been validated experimentally. It is suggested that in the frequency range above 200 Hz for this membrane-mass type structure, the sound insulation effect was principally not due to the low-level locally resonant mode of the mass block, but the continuous vertical resonant modes of the localized membrane. So based on such a physical property, a resonant modal group theory is initially proposed in this paper. In addition, the sound insulation mechanism of the membrane-type structure and thin plate structure were combined by the membrane/plate resonant theory.

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Section: -P5mentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Resonant modal group theory of membrane-type acoustical metamaterials for low-frequency sound attenuation

Huang

2015

Eur. Phys. J. Appl. Phys.

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“…Another advantage of acoustic metamaterials is that they produce a deep subwavelength effect in acoustic devices, which is favorable to develop small-scale AEH devices for low frequencies. For instance, Yuan et al [60] proposed a helix-type AEH structure that represents one type of bionic acoustic metamaterials [61]. The helix structure changes the sound propagation path and achieves low-frequency AEH in a compact design.…”

Section: Established Aeh Approachesmentioning

confidence: 99%

Recent Developments of Acoustic Energy Harvesting: A Review

et al. 2019

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Acoustic energy is a type of environmental energy source that can be scavenged and converted into electrical energy for small-scale power applications. In general, incident sound power density is low and structural design for acoustic energy harvesting (AEH) is crucial. This review article summarizes the mechanisms of AEH, which include the Helmholtz resonator approach, the quarter-wavelength resonator approach, and the acoustic metamaterial approach. The details of recently proposed AEH devices and mechanisms are carefully reviewed and compared. Because acoustic metamaterials have the advantages of compactness, effectiveness, and flexibility, it is suggested that the emerging metamaterial-based AEH technique is highly suitable for further development. It is demonstrated that the AEH technique will become an essential part of the environmental energy-harvesting research field. As a multidisciplinary research topic, the major challenge is to integrate AEH devices into engineering structures and make composite structures smarter to achieve large-scale AEH.

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“…The finite element method (FEM) is the most commonly used approach to biomechanical modeling and several studies on fluid-structure interaction can be found in literature. [25][26][27][28][29] However, no significant example of application of FE to the determination of HRTF is available in literature. Finite element (FE) models may solve this problem but no significant example of their application is documented in literature.…”

Section: Introductionmentioning

confidence: 99%

Finite Element Determination of the Head-Related Transfer Function

Huang

et al. 2015

J. Mech. Med. Biol.

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The auditory peripheral system, which takes care of collection and enlargement in hearing processing, is an important part of the overall auditory system. This system is the key of sound source identification and location, and an important basis for a variety of audio equipment design and sound quality evaluation. In order to better recognize the acoustic characteristics of the auditory peripheral system, and effectively guide the audio equipment design as well as the sound quality evaluation, this study presents a numerical model based on the finite element/ infinite element method (FEM/IFEM) to compute the near-field head-related transfer function (HRTF) on a reversed head model. A spherical sound source is positioned at different locations in the horizontal, median and lateral planes. The HRTFs and sound field distributions are computed for a frequency range up to 6 kHz. The present model is qualitatively validated against experimental data from MIT database. The results confirm the potentiality of the proposed approach which can efficiently detect the diffraction region, diffraction angle and tails in the sound field.

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Cochlear bionic acoustic metamaterials

Cited by 38 publications

References 31 publications

Resonant modal group theory of membrane-type acoustical metamaterials for low-frequency sound attenuation

Resonant modal group theory of membrane-type acoustical metamaterials for low-frequency sound attenuation

Recent Developments of Acoustic Energy Harvesting: A Review

Finite Element Determination of the Head-Related Transfer Function

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