Abstract
In this paper, a tunable broadband unidirectional acoustic transmission (UAT) device composed of a bended tube and a superlattice with square columns is proposed and numerically investigated by using finite element method. The UAT is realized in the proposed UAT device within two wide frequency ranges. And the effectiveness of the UAT device is demonstrated by analyzing the sound pressure distributions when the acoustic waves are incident from different directions. The unidirectional band gaps can be effectively tuned by mechanically rotating the square columns, which is a highlight of this paper. Besides, a bidirectional acoustic isolation (BAI) device is obtained by placing two superlattices in the bended tube, in which the acoustic waves cannot propagate along any directions. The physical mechanisms of the proposed UAT device and BAI device are simply discussed. The proposed models show potential applications in some areas, such as unidirectional sonic barrier or noise insulation.
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Acknowledgments
The authors gratefully acknowledge financial support from the National Basic Research Program of China (No. 2011CB610306), the Project of National Natural Science Foundation of China (No. 51275377), and Collaborative Innovation Center of Suzhou Nano Science and Technology.
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Song, A., Chen, T., Wang, X. et al. Tunable broadband unidirectional acoustic transmission based on a waveguide with phononic crystal. Appl. Phys. A 122, 759 (2016). https://doi.org/10.1007/s00339-016-0295-1
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DOI: https://doi.org/10.1007/s00339-016-0295-1