Analysis and improvement of sound radiation performance of spherical cap radiator |
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| Authors: | Tang Yi-Zheng Wu Zhao-Jun and Tang Li-Guo |
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| Affiliation: | Hangzhou Institute of Applied Acoustics, Hangzhou 310012, China; Department of Oceanography, Xiamen University, Xiamen 361005, China; 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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| Keywords: | spherical cap radiator acoustic soft material directivity |
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