Results 31 to 40 of about 518,428 (215)

Recent Advances in Acoustic Metamaterials for Simultaneous Sound Attenuation and Air Ventilation Performances

Crystals, 2020
In the past two decades, acoustic metamaterials have garnered much attention owing to their unique functional characteristics, which are difficult to find in naturally available materials. The acoustic metamaterials have demonstrated excellent acoustical
Sanjay Kumar, Heow Pueh Lee
doaj   +1 more source

Improving the Directionality of Low-Frequency Acoustic Radiation by a Finite Array of Quadrupolar Sources with Acoustic Metamaterials

Crystals, 2023
Manipulating radiation patterns is challenging, especially at low frequencies. In this paper, we demonstrate that acoustic metamaterials arranged as an array of quadrupoles remarkably improve the directionality of acoustic radiation at low frequencies ...
Qinglei Zeng, Shenlian Gao, Yun Lai, Xiaozhou Liu   +3 more
doaj   +1 more source

Research progress and development trend of smart metamaterials

Frontiers in Physics, 2022
The development of smart metamaterials has brought changes to human society, and various new products based on smart metamaterials are emerging endlessly.
Yongju Zheng, Yongju Zheng, Huajie Dai, Junyi Wu, Chuanping Zhou, Zhiwen Wang, Rougang Zhou, Rougang Zhou, Wenxin Li   +8 more
doaj   +1 more source

Influence of Geometric Structure, Convection, and Eddy on Sound Propagation in Acoustic Metamaterials with Turbulent Flow

Archives of Acoustics, 2021
The problem of reducing noise in transportation is an important research field to prevent accidents and to provide a civilised environment for people. A material that has recently attracted attention in research to reduce noise is acoustic metamaterial ...
Myong Chol PAK, Kwang-Il KIM, Hak Chol PAK, Kwon Ryong HONG   +3 more
doaj   +1 more source

Recent progress in acoustic metamaterials and active piezoelectric acoustic metamaterials - A review

Applied Materials Today, 2022
Abstract Acoustic metamaterials, structured to produce anomalous reflection and refraction indices that are not found in conventional materials, are gaining prominence in engineering applications. These artificial structures have enabled novel functionalities, such as negative effective properties, extraordinary wave manipulation, enhanced sound ...
Ji, G, Huber, J
openaire   +2 more sources

A Review of Acoustic Metamaterials and Phononic Crystals

Crystals, 2020
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.
Junyi Liu, Hanbei Guo, Ting Wang
doaj   +1 more source

Sustainable Solutions in Sound Shielding: Harnessing Metamaterials for Acoustic Cloaking [PDF]

E3S Web of Conferences
The development of metamaterials promises to enable smallscale, worldwide industry-wide acoustic, electromagnetic, mechanical, and solar energy harvesting.
Singh Thapa Devendra, Najah Zahraa, Khosla Vivek, Ravinder Rathod, B Swathi, Nagpal Amandeep, Cheeli Ashok Kumar   +6 more
doaj   +1 more source

Two-Dimensional Distributed Transmission-Line Models for Broadband Full-Tensor Anisotropic Acoustic Metamaterials Based on Transformation Acoustics

Crystals, 2022
We propose the design method for broadband acoustic metamaterials based on the concept of transformation acoustics. Two-dimensional distributed transmission-line (TL) models for full-tensor anisotropic electromagnetic metamaterials are applied to full ...
Tsutomu Nagayama, Akihiro Toshima, Seiji Fukushima, Toshio Watanabe   +3 more
doaj   +1 more source

Acoustic metamaterials [PDF]

Physics Today, 2016
By incorporating novel subwavelength structures into macroscopic materials, acousticians can create devices with exotic sound-altering properties.
Michael R. Haberman, Matthew D. Guild
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Flexible metamaterials for advanced photonics applications [PDF]

, 2014
We present our recent results on the design, fabrication and applications of flexible metamaterials in the visible and near infrared range. In particular, we demonstrate broad angle spectral filtering for lab-on-fibre applications, the realisation of ...
Shen, Y., Kirkpatrick, B., P. Reader-Harris, Di Falco, A., A. Di Falco, M. Pietrzyk, Pietrzyk, M., Y. Shen, Reader-Harris, P., B. Kirkpatrick   +9 more
core   +1 more source