Tunable acoustic metamaterial with negative modulus

A tunable negative modulus metamaterial is presented, and it is achieved by adjusting the medium density and an effective volume of a split hollow sphere (SHS). This work comprises experimental and numerical studies. The effects of water/air component and the steel ball on the transmission propertie...

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Bibliographic Details
Published inApplied physics. A, Materials science & processing Vol. 106; no. 4; pp. 807 - 811
Main Authors Hao, Li-Mei, Ding, Chang-Lin, Zhao, Xiao-Peng
Format Journal Article
LanguageEnglish
Published Berlin/Heidelberg Springer-Verlag 01.03.2012
Subjects
Characterization and Evaluation of Materials
Condensed Matter Physics
Machines
Manufacturing
Nanotechnology
Optical and Electronic Materials
Physics
Physics and Astronomy
Processes
Surfaces and Interfaces
Thin Films
Resonant Frequency
Hollow Sphere
Resonance Frequency
Steel Ball
Transmittance Curve
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Summary:A tunable negative modulus metamaterial is presented, and it is achieved by adjusting the medium density and an effective volume of a split hollow sphere (SHS). This work comprises experimental and numerical studies. The effects of water/air component and the steel ball on the transmission properties were investigated in the impedance tube system. The experimental results show that the transmission dip has a significant blue-shift with increasing water content, whereas the steel ball has a relatively small influence on the resonant frequency. The simulated results by the finite-element method (FEM) are in agreement with the experimental results. Based on medium parameters among the SHS, acoustic metamaterial (AM) with negative modulus can easily be designed in the expected frequency domain, and it provides a convenient route to tune AMs.
ISSN:0947-8396
1432-0630
DOI:10.1007/s00339-011-6682-8