期刊
EPL
卷 107, 期 3, 页码 -出版社
EPL ASSOCIATION, EUROPEAN PHYSICAL SOCIETY
DOI: 10.1209/0295-5075/107/34009
关键词
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资金
- National Basic Research Program of China [2012CB921504, 2011CB707902]
- National Natural Science Foundation of China [11274166]
- fundamental research funds for the Central Universities [1113020403, 1101020402]
- State Key Laboratory of Acoustics
- Chinese Academy of Science [SKLOA201401]
- Jiangsu Higher Education Institutions
- SRF for ROCS, SEM
Previous research into acoustic omnidirectional absorber (AOA) has shown the feasibility of forming acoustic black hole to guide the incident wave into the central absorptive cavity. However, major restrictions to practical applications exist due to complexity of designing metamaterials and unchangeable working states. Here, we propose two cylindrical, two-dimensional AOA schemes based on temperature gradients for airborne applications. One scheme with accurately designed temperature gradients has a better absorption performance which can almost completely absorb the incident wave, while the other one with a simplified configuration has low complexity which makes it much easier to realize. Geometric acoustics is used to obtain the refractive index distributions with different radii, which is then utilized to deduce the desired temperature gradients. Both schemes are temperature-tuned with broad working bandwidth. Copyright (C) EPLA, 2014
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