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Tunable acoustic metamaterial with negative modulus

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Abstract

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.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China under Grant Nos. 50872113, 50936002 and 11174234, and the National Key Scientific Program of China under project No. 2012CB921503.

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Authors and Affiliations

  1. Smart Materials Laboratory, Department of Applied Physics, Northwestern Polytechnical University, Xi’an, 710129, P.R. China

    Li-Mei Hao, Chang-Lin Ding & Xiao-Peng Zhao

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  1. Li-Mei Hao
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  2. Chang-Lin Ding
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  3. Xiao-Peng Zhao
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Correspondence to Xiao-Peng Zhao.

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Hao, LM., Ding, CL. & Zhao, XP. Tunable acoustic metamaterial with negative modulus. Appl. Phys. A 106, 807–811 (2012). https://doi.org/10.1007/s00339-011-6682-8

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  • DOI: https://doi.org/10.1007/s00339-011-6682-8

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