A high displacement ultrasonic horn with a cuboid hole in the front end

In ultrasonic machining and processing or in underwater acoustics, the output end surface of a vibration system needs large amplitude to improve work efficiency. A uniform horn with a cuboid hole at front end is proposed for amplifying amplitude. The finite element method is used to calculate the displacement distribution, magnification factor of the output end surface and to optimize the geometrical size and the position of the cuboid hole at resonant frequency. The influence of position and geometrical size of the hole on resonant frequency of the horn is studied, and the maximum magnification factor can reach seven times greater than that of a uniform solid horn after optimization. The horn is connected to a longitudinal vibration transducer, the frequency, mode shape, displacement distribution of the output surface, and the amplitude magnification factor were measured by using a laser vibrometer. The experimental results were consistent with the analysis of the finite element calculation results. In addition, the test results also show that excitation voltage has a linear relationship with the output displacement of the horn.