期刊
JOURNAL OF APPLIED PHYSICS
卷 122, 期 5, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4996848
关键词
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资金
- Youth Innovation Promotion Association of CAS [2017029]
- National Natural Science Foundation of China [11304351]
In this article, we propose a design for an impedance-matching acoustic bend. The bending structure is composed of sub-wavelength unit cells containing perforated plates and side pipes that allow the mass density and the bulk modulus of each unit cell to be tuned simultaneously. The refractive index and the impedance of the acoustic bend can therefore be modulated simultaneously to guarantee both the bending effect and high acoustic transmission. The results of simulation of the sound pressure field distribution show that the bending effect of the proposed impedance-matching acoustic bend is very good. Transmission spectra are calculated for both the impedance-matching acoustic bend and an acoustic bend composed of the perforated plates alone for comparison. The results indicate that the impedance-matching acoustic bend successfully improves the impedance ratio while also obviously increasing the transmission. Published by AIP Publishing.
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