Theoretical and experimental study on two-dimensional binary locally resonant phononic crystals

Wang Gang; Wen Jihong; Liu Yaozong; Wen Xisen

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Theoretical and experimental study on two-dimensional binary locally resonant phononic crystals

Wang Gang 1 * #,Wen Jihong 1,Liu Yaozong 2,Wen Xisen 1

1.Institute of Mechatronical Engineering,National University of Defense Technology

2.Institute of Mechatronical Engineering-National University of Defense Technology

*Correspondence author

#Submitted by

Subject:

Funding: 国家自然科学基金（No.50575222）

Opened online:13 January 2006

Accepted by: none

Citation: Wang Gang,Wen Jihong,Liu Yaozong.Theoretical and experimental study on two-dimensional binary locally resonant phononic crystals[OL]. [13 January 2006] http://en.paper.edu.cn/en_releasepaper/content/4997

The theoretical prediction of a locally resonant band gap in two-dimensional binary phononic crystals is verified experimentally. Numerical simulations show that the in-plane subfrequency gap exists in the thin plate of phononic crystal is much wider than that in the bulk of phononic crystal. Theoretical analysis shows that this is due to the different pure shearing/compressing module ratios in the thin plate and the bulk. The band gap edges as well as the mid-gap attenuations of finite samples are studied with different filling fractions, elastic parameters and densities of host medium. Vibration experiments are conducted with two thin plates of two-dimensional binary locally resonant phononic crystal, which are with and without holes respectively. The measured subfrequency gaps are in good agreement with the theoretical predictions.

Keywords:Phononic crystal; Vibration band gap; Locally resonant

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