有限面元式Helmholtz积分方程法求解慢波导环形换能器的辐射声场

慢波导环形换能器是由慢波导和自由淹没式环形换能器组合而成的一种水声换能器。这种换能器利用慢波导对声场的调节作用,有效地改善了换能器的方向性。但是,这种换能器的辐射声场不能直接利用Helmholtz积分法进行解析求解。为此,本文利用有限面元式Helmholtz积分方程算法对其进行了数值求解。文中给出了慢波导环形换能器方向性的数值计算结果和实际测量结果,两者基本上是一致的。

TO SOLVE THE RADIATED ACOUSTIC FIELD OF FREE-FLOODED-RING TRANSDUCER WITH SLOW WAVEGUIDE BY THE METHOD OF HELMHOLTZ INTEGRAL EQUATIONS IN THE FORM OF FINITE SURFACE ELEMENT

The free-flooded-ring transducer with slow waveguide is the underwater acoustic transducer which is composed of the free-flooded-ring vibrator and slow waveguide. Such transducer utilizes the modulating effect of the slow waveguide on the sound field and the directivity of transducer is effectively improved. However,the sound field of such transducer can not be solved analytically by the Helmholtz integral formulation. In this paper,numerical solution is found through the use of the Helmholtz integral equations in the form of the finite surface element. The numerical and experimental results are essentially in agreement.