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Audible sound metamaterial

Ding Chang-Lin Zhao Xiao-Peng

Audible sound metamaterial

Ding Chang-Lin, Zhao Xiao-Peng
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  • Abstract views:  4137
  • PDF Downloads:  1671
  • Cited By: 0
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  • Received Date:  10 December 2008
  • Accepted Date:  05 January 2009
  • Published Online:  20 September 2009

Audible sound metamaterial

  • 1. 西北工业大学应用物理系,西安 710129

Abstract: We fabricated a kind of 1D metamaterial which consists of periodic array of Helmholtz resonators and tested its acoustic transmission at audible sound frequency in air. The experimental results show that a transmission dip appears at the frequency range of 2.1—3.5 kHz. The transmission ratio simulated by acoustic transmission line method (ATLM) is in accordance with the experimental results. From the effective impedance calculated by ATLM, the transmission dip is ascribed to the backward wave reflection of HRsresonance. Furthermore, the transmission pressure distribution measurement of the inner sample clearly demonstrates the resonance effect in the metamaterial, in which there is an out-of-phase response to the driving field. The value of effective modulus is calculated to be negative based on the resonant model mentioned before.

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