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Special Issue:
Virtual Special Topic — Acoustics
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| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Underwater asymmetric acoustic transmission structure using the medium with gradient change of impedance |
| Bo Hu(胡博)1,2, Jie Shi(时洁)1,2, Sheng-Guo Shi(时胜国)1,2, Yu Sun(孙玉)1,2, Zhong-Rui Zhu(朱中锐)1,2 |
1. College of Underwater Acoustic Engineering, Harbin Engineering University, Harbin 150001, China;
2. Science and Technology on Underwater Acoustic Laboratory, Harbin Engineering University, Harbin 150001, China |
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Abstract We propose an underwater asymmetric acoustic transmission structure comprised of two media each with a gradient change of acoustic impedance. By gradually increasing the acoustic impedances of the media, the propagating direction of the acoustic wave can be continuously bent, resulting in allowing the acoustic wave to pass through along the positive direction and blocking acoustic waves from the negative one. The main advantages of this structure are that the asymmetric transmission effect of this structure can be realized and enhanced more easily in water. We investigate both numerically and experimentally the asymmetric transmission effect. The experimental results show that a highly efficient asymmetric acoustic transmission can be yielded within a remarkable broadband frequency range, which agrees well with the numerical prediction. It is of potential practical significance for various underwater applications such as reducing vibration and noise.
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Received: 18 June 2015
Revised: 13 August 2015
Accepted manuscript online:
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PACS:
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43.30.+m
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(Underwater sound)
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43.30.Bp
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(Normal mode propagation of sound in water)
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43.30.Ky
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(Structures and materials for absorbing sound in water; propagation in fluid-filled permeable material)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11204049 and 11204050), the Program for Changjiang Scholars and Innovative Research Team in University of Ministry of Education of China (Grant No. IRT1228), and the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant Nos. 20122304120023 and 20122304120011). |
Corresponding Authors:
Jie Shi
E-mail: shijie@hrbeu.edu.cn
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Cite this article:
Bo Hu(胡博), Jie Shi(时洁), Sheng-Guo Shi(时胜国), Yu Sun(孙玉), Zhong-Rui Zhu(朱中锐) Underwater asymmetric acoustic transmission structure using the medium with gradient change of impedance 2016 Chin. Phys. B 25 024305
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