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Analysis and improvement of sound radiation performance of spherical cap radiator |
| Tang Yi-Zheng(唐义政)a), Wu Zhao-Jun(吴昭军) b)c), and Tang Li-Guo(汤立国)b)c)† |
| a Hangzhou Institute of Applied Acoustics, Hangzhou 310012, China; b Department of Oceanography, Xiamen University, Xiamen 361005, China; c Key Laboratory of Underwater Acoustic Communication and Marine Information Technology, Ministry of Education, Xiamen University, Xiamen 361005, China |
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Abstract A spherical cap radiator is one of the important parts of an underwater wide-beam imaging system. The back radiation of a traditional spherical cap radiator, which is composed of a vibrating cap and a rigid baffle, is strong and its far-field directivity function may fluctuate in big amplitude in the vicinity of the polar axis. These shortcomings complicate the processing of the reflective waves received for imaging the targets. In this study, the back radiation is weakened by adding an acoustic soft material belt between the vibrating cap and the rigid baffle. And the fluctuation mentioned above is lowered remarkably by dividing the spherical cap radiator into many annuluses and a relatively smaller spherical cap, and by controlling the phase retardations of all elements appropriately. Furthermore, the numerical experiments are carried out by the finite element method (FEM) to prove the validity of the above methods.
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Received: 06 September 2009
Revised: 19 November 2009
Accepted manuscript online:
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PACS:
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43.30.Xm
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(Underwater measurement and calibration instrumentation and procedures)
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43.40.Rj
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(Radiation from vibrating structures into fluid media)
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02.70.Dh
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(Finite-element and Galerkin methods)
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| Fund: Project supported by the National
High Technology Research and Development Program of China (Grant
No.~2006AA09Z109) and the Natural Science Foundation of Fujian
Province, China (Grant No.~T0750014). |
Cite this article:
Tang Yi-Zheng(唐义政), Wu Zhao-Jun(吴昭军), and Tang Li-Guo(汤立国) Analysis and improvement of sound radiation performance of spherical cap radiator 2010 Chin. Phys. B 19 054303
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