Results 81 to 90 of about 3,581 (229)

Focusing ultrasound with an acoustic metamaterial network [PDF]

, 2009
We present the first experimental demonstration of focusing ultrasound waves through a flat acoustic metamaterial lens composed of a planar network of subwavelength Helmholtz resonators.
Yin, Leilei, Zhang, Shu, Fang, Nicholas
core   +1 more source

Acoustic multipolar local effects of metamaterial with annular columnar structures

Journal of Measurement Science and Instrumentation, 2017
Research of the acoustic local effect of metamaterial is widely used in the fields of environmental science,military industry and biomedicine.In this paper,the metamaterial is designed by annular columnar structures.The acoustic local effect in slender ...
HAN Jian-ning, ZHEN Wen-xiang, QIN Jia-jie, WU Yu-peng, TANG Shuai, Key Laboratory of Instrumentation Science and Dynamic Measurement   +5 more
doaj  

Absorption of Broadband Low‐Frequency Sound Beyond the Thermodynamics Limit: An Acoustic Resonator With Magnetic Bearing

Advanced Science, EarlyView.
This work presents a magnetic‐bearing acoustic resonator that overcomes the thermodynamics limit of sound absorption. By introducing tunable negative stiffness, it achieves broadband low‐frequency absorption within a compact cavity, far exceeding the performance achievable by classic mass‐tuned designs.
Ying Hu, Zhe Zhang, Bohua Huang, Xue Han, Hallam Bastin Kilcoyne, Lixi Huang   +5 more
wiley   +1 more source

Additively Manufactured TPU Acoustic Metamaterials for High-Frequency Noise Mitigation in Dental Rotary Instruments

The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science
Noise generated by high-speed dental turbines represents a persistent challenge in dental clinics, affecting both patient comfort and the occupational well-being of medical staff.
Emilian CHIFOR, Florin-Bogdan MARIN, Mihaela MARIN   +2 more
doaj   +1 more source

Bistable Networks Enable Complex Shape Changes

Advanced Science, EarlyView.
Transition‐controlled metamaterials are networks of bistable mechanical memory that store local binary states and express them as global shape change. By decoupling low‐force programming from high‐force holding, a single lattice is reconfigured into distinct 2D profiles and 3D surfaces without continuous actuation, enabling reusable morphing materials ...
Sawyer Thomas, Jeffrey Lipton
wiley   +1 more source

Extreme acoustic metamaterial by coiling up space [PDF]

, 2012
We show that by coiling up space using curled perforations, a two-dimensional acoustic metamaterial can be constructed to give a frequency dispersive spectrum of extreme constitutive parameters, including double negativity, a density near zero, and a ...
Liang, Z., Li, Jensen, Li, Jensen Tsan Hang, Liang, Zixian   +3 more
core   +1 more source

Research Progress on Thin-Walled Sound Insulation Metamaterial Structures

Acoustics
Acoustic metamaterials (AMs) composed of periodic artificial structures have extraordinary sound wave manipulation capabilities compared with traditional acoustic materials, and they have attracted widespread research attention.
Yumei Zhang, Jie Zhang, Ye Li, Dan Yao, Yue Zhao, Yi Ai, Weijun Pan, Jiang Li   +7 more
doaj   +1 more source

Physics‐Aware Machine‐Learning‐Driven Inverse Design of Broadband Ultra‐Open Acoustic Metamaterials

Advanced Science, EarlyView.
A physics‐aware machine‐learning framework enables inverse design of ultra‐open acoustic silencers by decoupling spectral and radial design spaces. The approach rapidly identifies broadband, compact, and highly ventilated architectures, while revealing hidden linear design rules that link geometry, impedance matching, and acoustic performance.
Zhiwei Yang, Mengyu Li, Xiaohang Xie, Ao Chen, Thomas G. Bifano, Xin Zhang   +5 more
wiley   +1 more source

Design of a Programmable Active Acoustic Metamaterial [PDF]

, 2012
Metamaterials are artificial materials engineered to provide properties which may not be readily available in nature. The development of such class of materials constitutes a new area of research that has grown significantly over the past decade ...
Smoker, Jason James
core  

Single‐Sensor Vibration Sensing in Anisotropic Composites Enabled by Disordered Metasurfaces

Advanced Science, EarlyView.
This work develops a single‐sensor vibration sensing (SSVS) framework that integrates disordered metasurfaces with compressive sensing. Comprehensive numerical and experimental validations demonstrate that, by manipulating anisotropic guided wave propagation through metasurfaces, the proposed SSVS framework enables high‐fidelity multi‐source vibration ...
Jianjie Zhang, Lanhe Xu, Zhongzheng Zhang, Yongbo Li, Eric Li, Asoke K. Nandi, Bing Li   +6 more
wiley   +1 more source