Now, ultrasonic cleaning has been widely used in industry, however its applications in our lives are very few. It is theoretically possible that ultrasonic cleaning could be applied in civil. The author studies a kind of portable ultrasonic cleaning machine which is suitable for various fields. In consideration of the portable ultrasonic cleaning machine characteristics such as small, convenient, high frequency and high intensity focus, the author presents a model of compound acoustic horn which is composed of a conic horn of varying section and a horn of uniform section. Because this compound acoustic horn which has complicated shape is not traditional horn, and it is difficult to analyze it with traditional method. This situation is able to influence on the design of the acoustic horn, especially the confirmation of the vibration node, even the whole system matching. So in this paper the finite-element method (FEM) is used to analyze the dynamic performance of the compound acoustic horn. By the finite-element analysis, the natural frequency and the natural vibration mode of the compound acoustic horn are ascertained, furthermore, from the graph results we can find the stress and the displacement in the end of the acoustic horn are the biggest, but the displacement in the Flange is about zero. So the reliability performance and the reasonable design of the compound acoustic horn are proved in theory. In addition, the tests indicate the result of the finite-element analysis tallies with that of actual use after processing the compound acoustic horn.

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