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Article
Open AccessTunable acoustic vortex generation by a compact rotating disk
Acoustic vortices (AVs) carry orbital angular momentum (OAM), showing great promise in advancing communication, biomedicine, and metrology. An ideal OAM generation method that realizes the tunability of AV top...
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Article
Low-Frequency Sound Absorption of an Inhomogeneous Micro-Perforated Panel with J-Shaped Cavities of Different Depths
In this paper, a micro-perforated panel (MPP) composite structure consisting of an inhomogeneous MPP (IMPP) backed with J-shaped cavities of different depths for low-frequency sound absorption is proposed. The...
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Article
Enhanced wideband low-frequency sound absorption of a single-layer multiple parallel-arranged inhomogeneous microperforated panel absorber
A single layer of four parallel-arranged inhomogeneous microperforated panels (iMPP) absorber is proposed to achieve low-frequency sound absorption and wider frequency bandwidth. The hole diameter of the four ...
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Article
A thin double-layer multiple parallel-arranged inhomogeneous microperforated panel absorber for wideband low-frequency sound absorption
We propose a thin double-layer multiple parallel-arranged inhomogeneous microperforated panel (MPP) absorber in which the perfect low-frequency (i.e., 100–500 Hz) sound absorption with wider bandwidth is achie...
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Article
Open AccessShell-type acoustic metasurface and arc-shape carpet cloak
We systematically propose a thin shell-type acoustic metasurface, which could be used to design a carpet cloak that closely covers an arc-shaped object, therefore providing the necessary support for hiding an ...
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Article
Extracting method of dynamic effective parameters for plate-type elastic metamaterials with decentralized resonant mass
In this paper, a method is presented to obtain both in-plane and out-plane dynamic effective parameters of plate-type elastic metamaterials with decentralized resonant mass. The method is derived by plate-type...
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Article
Open AccessBilayer synergetic coupling double negative acoustic metasurface and cloak
In this paper, we propose a bilayer plate-type lightweight double negative metasurface based on a new synergetic coupling design concept, by which the perfect absorption, double negative bands, free manipulati...
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Article
Cochlear outer hair cell bio-inspired metamaterial with negative effective parameters
Inspired by periodical outer hair cells (OHCs) and stereocilia clusters of mammalian cochlear, a type of bio-inspired metamaterial with negative effective parameters based on the OHC structure is proposed. Wi...
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Article
Vibration and noise analysis of multiphysical coupling systems
Vibration and noise analysis of complex mechanical systems is very difficult by traditional technologies. We present a novel technology to analyze the vibration and noise of complex structures. This technology...
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Article
Analysis of non-Fourier heat conduction in a solid sphere under arbitrary surface temperature change
In this paper, the non-Fourier heat conduction in a solid sphere under arbitrary surface thermal disturbances is solved analytically. Four cases including sudden, simple harmonic periodic, triangular and pulse...
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Article
Melting Refining Mechanisms in Supersonic Atmospheric Plasma Spraying
In recent years, Yttria-stabilized zirconia based thermal barrier coatings (TBCs) are deposited by newly-developed high-efficiency supersonic atmospheric plasma spraying (SAPS) technology. The final microstruc...
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Article
The Van der Waals-force-induced phononic band gap and resonant scattering in two-nanosphere aggregate
A physical mechanism of phononic band gap and resonant nanoacoustic scattering in an aggregate of two elastic nanospheres is presented in this paper. By considering the Van der Waals (VdW) force between two na...
