Reconfigurable sound anomalous absorptions in transparent waveguide with modularized multi-order Helmholtz resonator

Long, Houyou; Cheng, Ying; Liu, Xiaojun

doi:10.1038/s41598-018-34117-z

Cited by 41 publications

(27 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When measuring the acoustic performances such as absorptions of the tunable absorber, we all employ the four-microphone method in a square impedance tube. [38] In order to adjust the sliders to achieve efficient frequency adjustment, we investigate the relation between geometric The adaptive adjustment process of the absorption unit. The microphone detects the sound signal and transmits the signal to the microcontroller for analysis and processing.…”

Section: Methods and Resultsmentioning

confidence: 99%

“…In this way, in the narrow channels, owing to the significant acoustic pressure and velocity are difference between the internal cavity and the external environment, sound energy is dissipated by air friction and converted into heat. [38,39] In addition, the slit in the pipe makes both of the cavities with the same eigenmode form a weak coupling. This condition ensures that the absorption peaks of the two cavities are merged instead of a split due to radiation coupling.…”

Section: Methods and Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Automatically Adaptive Ventilated Metamaterial Absorber for Environment with Varying Noises

Tian

et al. 2021

Adv Materials Technologies

View full text Add to dashboard Cite

thickness, health and environment issues, fire resistance, moisture resistance, and durability issues. [1][2][3][4] In the past two decades, varieties of artificial structures, collectively called "acoustic metamaterials," have been designed to manipulate sound waves beyond natural limits. [5][6][7][8][9][10][11][12][13] For example, low-frequency (<500 Hz) sound waves have strong penetration ability, long propagation distance, and low attenuation coefficient, hence it is still a great challenge to deal with low-frequency noises. [1,3,4,14] In the last decade, diverse sound-absorbing metamaterials in subwavelength scales have been designed, which generally increase the density of states at targeted low-frequencies in the metamaterials in order to enhance the dissipation of sound energy. [15][16][17][18][19][20][21][22][23][24][25] However, for most acoustic metamaterials, their targeted frequencies and operating functions can hardly be adjusted after being fabricated. It is hence an intrinsic barrier for their applications in scenarios where the frequencies of noise can change over time.To overcome this stringent barrier, tunable acoustic metamaterial absorbers have been proposed and investigated in recent years. [26,27] Some tunable mechanisms, mainly employing the mechanical deformations, piezoelectric, and/or magnetic effects, have been presented. [28][29][30][31][32][33] However, they generally require rigid backings to impede sound transmissions, which forbid the transmission of fluids, such as air and water. The absorption of a ventilated acoustic metamaterial composed of subwavelength scatters is usually much smaller compared with its reflection. It is a challenge to break the limit and finally achieve a tunable absorber with simultaneously good absorption and ventilation at low frequencies. [33] Besides, their intricate mechanical, electronic, and magnetic structures are inconvenient and may be unstable for daily applications. [34,35] Moreover, previously designed adjustable metamaterial absorbers could not automatically perceive incident sound to realize intelligent adjustment and absorption. [21,[36][37][38][39][40][41][42][43] A simpler, more adjustable, and more automatic scheme is eagerly needed.Here, we demonstrate an automatically adaptive ventilated metamaterial absorber (AAVMA) for low-frequency sound that can achieve high-efficiency (>90%) absorption for onesided incidence with frequency varying in the working range. The ventilated absorber can automatically monitor the environmental noise and intelligently adjust the sound absorption An automatically adaptive metamaterial sound absorber is designed, which can absorb tunable low-frequency (<500 Hz) sounds under ventilated conditions by designing a feedback circuit to actively detect the noise signals and adjust the sliders on the reconfigurable absorbers. The automatically adaptive ventilated absorber provides an intelligent route to adapt for different low frequencies, through adjusting the sound absorption units directly in accordance with the...

show abstract

Section: Methods and Resultsmentioning

confidence: 99%

Section: Methods and Resultsmentioning

confidence: 99%

Automatically Adaptive Ventilated Metamaterial Absorber for Environment with Varying Noises

Tian

et al. 2021

Adv Materials Technologies

View full text Add to dashboard Cite

show abstract

“…Therefore, the application of constructed functional devices has been restricted. In the latest research, the multiorder HR, which can generate multiorder resonances, was presented to compensate for the above deficiencies 32 . Figure 1b shows a schematic view of a two-order Helmholtz resonator (THR).…”

Section: Physical Modelmentioning

confidence: 99%

Acoustic Structure Inverse Design and Optimization Using Deep Learning

Sun

Han

Yang

et al. 2021

Preprint

View full text Add to dashboard Cite

From ancient to modern times, acoustic structures have been used to control the propagation of acoustic waves. However, the design of acoustic structures has remained a time-consuming and computational resource-consuming iterative process. In recent years, deep learning has attracted unprecedented attention for its ability to tackle hard problems with large datasets, achieving state-of-the-art results in various tasks. In this work, an acoustic structure design method is proposed based on deep learning. Taking the design of multiorder Helmholtz resonator as an example, we experimentally demonstrate the effectiveness of the proposed method. Our method is not only able to give a very accurate prediction of the geometry of acoustic structures with multiple strong-coupling parameters, but also capable of improving the performance of evolutionary approaches in optimization for a desired property. Compared with the conventional numerical methods, our method is more efficient, universal and automatic, and it has a wide range of potential applications, such as speech enhancement, sound absorption and insulation.

show abstract

“…Accordingly, a significant amount of research has been conducted in order to identify materials with excellent sound absorption and sound insulation properties [6,7]. Sound-absorbing materials typically include one or more components from porous materials [8], plate or membrane vibration materials [9], or resonators [10,11].…”

Section: Introductionmentioning

confidence: 99%

An Experimental Study on the Performance of Corrugated Cardboard as a Sustainable Sound-Absorbing and Insulating Material

2021

View full text Add to dashboard Cite

The continuing development of industrialization and increasing population density has led to the emergence of noise as an increasingly common problem, requiring various types of sound absorption and insulation methods to address it. Meanwhile, the recycling of resources to ensure a sustainable future for the planet and mankind is also required. Therefore, this study investigates the potential of corrugated cardboard as a resource for noise reduction. The sound absorption and insulation performance of non-perforated corrugated cardboard (NPCC) were measured, and modified corrugated boards were fabricated by drilling holes either through the surface of the corrugated board alone or through the corrugated board in its entirety. The sound-absorption/insulation performance both of perforated corrugated cardboard (PCC) and perforated corrugated cardboard with multi-frequency resonators (PCCM) were measured using the transfer function method and the transmission matrix method. To determine the effectiveness of NPCC, PCC, and PCCM in noise reduction, the sound pressure level was analyzed by applying it to a home blender. The results showed PCCM’s sound absorption and insulation performance to be excellent. On the basis of these findings, we propose the use of PMMC as an eco-friendly noise-reduction material.

show abstract

Reconfigurable sound anomalous absorptions in transparent waveguide with modularized multi-order Helmholtz resonator

Cited by 41 publications

References 37 publications

Automatically Adaptive Ventilated Metamaterial Absorber for Environment with Varying Noises

Automatically Adaptive Ventilated Metamaterial Absorber for Environment with Varying Noises

Acoustic Structure Inverse Design and Optimization Using Deep Learning

An Experimental Study on the Performance of Corrugated Cardboard as a Sustainable Sound-Absorbing and Insulating Material

Contact Info

Product

Resources

About