Plate-type acoustic metamaterials: Evaluation of a large-scale design adopting modularity for customizable acoustical performance

Ang, Linus Yinn Leng; Koh, Yong Khiang; Lee, Heow Pueh

doi:10.1016/j.apacoust.2019.01.027

Cited by 43 publications

(20 citation statements)

References 31 publications

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“…This section first presents the two selected meta-panel configurations (Section 2.1) before moving on to discuss the experimental methods (Section 2.2). To minimise repetition, only the differences between this study and the previous work [26] are discussed. Nonetheless, crucial information is still provided.…”

Section: Methodsmentioning

confidence: 99%

“…The two meta-panel configurations were selected because they exhibited the widest frequency bandwidth of good acoustical performance at low frequencies (<500 Hz) compared to that of the other configurations [26]. Both configurations were solely occupied by specimens with resonator ( Figure 1a), which were previously investigated in a small-scale study [21,22].…”

Section: Meta-panel Configurationsmentioning

confidence: 99%

“…Over the past five years, researchers [1,23,24] have shown growing interest in large-scale membrane-type acoustic metamaterials despite the aforementioned challenges. However, large-scale plate-type acoustic metamaterials have yet to be studied extensively, evident from the literature in which limited works [20,25,26] can be found. Varanasi et al [20,25] proposed a large-scale design (1.22 × 1.22 m 2 ) that had close resemblance to a plate-type acoustic metamaterial.…”

Section: Introductionmentioning

confidence: 99%

“…Although numerous configurations were considered, none had dissimilar unit cells on the same panel to study whether they could collectively contribute to the acoustical performance of the panel. Ang et al [26] filled in the research gap with a large-scale design (994 × 994 mm 2 ) that adopted the concept of modularity for customisable acoustical performance. The proof-of-concept design-also referred to as the meta-panel-was realised by slotting specimens with two different configurations (without and with resonator) into the periodic cutouts on a host structure.…”

Section: Introductionmentioning

confidence: 99%

“…This study aims to justify whether the meta-panel could indeed be viable for noise control in the industry by investigating two selected meta-panel configurations reported previously [26] in greater detail. This investigation compares the acoustical performance with that of two commercially available noise barriers and evaluates the acoustical performance in three different noise environments-traffic noise, aircraft flyby noise, and construction noise.…”

Section: Introductionmentioning

confidence: 99%

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Plate-Type Acoustic Metamaterials: Experimental Evaluation of a Modular Large-Scale Design for Low-Frequency Noise Control

Ang

Koh²,

Lee

2019

Acoustics

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For industrial applications, the scalability of a finalised design is an important factor to consider. The scaling process of typical membrane-type acoustic metamaterials may pose manufacturing challenges such as stress uniformity of the membrane and spatial consistency of the platelet. These challenges could be addressed by plate-type acoustic metamaterials with an internal tonraum resonator. By adopting the concept of modularity in a large-scale design (or meta-panel), the acoustical performance of different specimen configurations could be scaled and modularly combined. This study justifies the viability of two meta-panel configurations for low-frequency (80–500 Hz) noise control. The meta-panels were shown to be superior to two commercially available noise barriers at 80–500 Hz. This superiority was substantiated when the sound transmission class (STC) and the outdoor-indoor transmission class (OITC) were compared. The meta-panels were also shown to provide an average noise reduction of 22.7–27.4 dB at 80–400 Hz when evaluated in different noise environments—traffic noise, aircraft flyby noise, and construction noise. Consequently, the meta-panel may be further developed and optimised to obtain a design that is lightweight and yet has good acoustical performance at below 500 Hz, which is the frequency content of most problematic noises.

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Section: Methodsmentioning

confidence: 99%

Section: Meta-panel Configurationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Plate-Type Acoustic Metamaterials: Experimental Evaluation of a Modular Large-Scale Design for Low-Frequency Noise Control

Ang

Koh²,

Lee

2019

Acoustics

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Acoustic Metamaterials: A Review of Theories, Structures, Fabrication Approaches, and Applications

Liao

Luan

Wang

et al. 2021

Adv Materials Technologies

128

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Acoustic metamaterials (AMs), which are materials composed of subwavelength periodic artificial structures with specific designs, have drawn significant research attention. This is because of the extraordinary abilities of AMs to manipulate acoustic waves compared with those of traditional acoustic materials. In this review, current advances in AM research are comprehensively investigated and summarized. First, major theories regarding AMs, including the acoustic wave equation, crystal lattice and energy band theory, effective medium theory, and general Snell's law, are explained in detail. Existing AM structures are then described and divided into several categories based on their structural characteristics and responses to acoustic waves. Furthermore, to bridge the gap between design and practical application, both conventional and advanced AM manufacturing methods are summarized. The applications of AMs in the fields of acoustic cloaking, acoustic lensing, acoustic absorption, noise reduction, and supernormal sound transmission are particularly delineated. Finally, contemporary challenges, trends, and strategies relevant to AMs are discussed. This review aims to provide a comprehensive collection of AM‐related knowledge, including information regarding physical theories, structures, fabrication approaches, and applications, which will help promote the further development of AMs.

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A Review Approach for Sound Propagation Prediction of Plate Constructions

Zarastvand

Ghassabi

Talebitooti

2020

Arch Computat Methods Eng

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Plate-type acoustic metamaterials: Evaluation of a large-scale design adopting modularity for customizable acoustical performance

Cited by 43 publications

References 31 publications

Plate-Type Acoustic Metamaterials: Experimental Evaluation of a Modular Large-Scale Design for Low-Frequency Noise Control

Plate-Type Acoustic Metamaterials: Experimental Evaluation of a Modular Large-Scale Design for Low-Frequency Noise Control

Acoustic Metamaterials: A Review of Theories, Structures, Fabrication Approaches, and Applications

A Review Approach for Sound Propagation Prediction of Plate Constructions

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