Abstract:
In this paper, a cylindrical horn with a rectangular hole through the front end is proposed. The finite element method is used to calculate the amplification factor and the displacement of the output surface at the resonant frequency, the influence of the size of hole at the resonant frequency of the horn is studied. And the geometry of the hole is optimized to obtain the maximum amplification factor, and the amplification factor is greatly improved compared with the conventional horns. The stress of the horn before and after optimization is analyzed. Connecting the horn with transducer, the frequency, mode shape of the vibration system, displacement distribution of the output surface and amplification factor with respect to the input surface of the horn, were measured by using the laser vibrometer. The experimental results were consistent with the analysis of the finite element calculation results. The test results also show that the excitation voltage has a linear relationship with the output displacement of the horn.