Acoustic metamaterials are large-scale materials with small-scale structures. These
structures allow for unusual interaction with propagating sound and endow the large-scale …

Phononic crystals (PnC) are spatially periodic materials with band gaps that form by Bragg
scattering of elastic waves. Within the frequency range of a band gap, wave propagation is …

With the growing popularity of smart speakers, numerous novel acoustic sensing
applications have been proposed for low-frequency human speech and high-frequency …

Acoustic metamaterials (AMMs) are promising in high-performance acoustic detection and
imaging; however, few can be combined with sensors to form a practical detector, and most …

Detecting weak acoustic signals within a strong background noise environment is of
significant importance across various research fields. However, conventional detection …

In this work, a phononic crystal gradient metamaterial structure (PCGMs) is proposed based
on the strong wave compression effect coupled with equivalent medium theory to achieve …

In this paper, an improved recursive least squares (RLS) method has been proposed to
enhance the signal-to-noise ratio (SNR) of dual wavelength distributed fiber acoustic …

Metamaterial advancements hold promise for compact renewable energy harvesting,
capturing acoustic, electromagnetic, mechanical, and solar energy on a modest scale across …

This paper discusses challenges, limitations and problems arising in currently employed
acoustic emission testing systems, sensors and signal processing algorithms. Main factors …