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提出了一种新型耦合振动环形超声辐射器,辐射器由纵振换能器及变幅杆激励特定尺寸的金属圆环,使其能有效地将纵向振动转化为圆环的径向轴向耦合振动从而向环的径向、轴向辐射超声波,并且在环的中心形成聚焦声场。推导了该辐射器的等效电路,给出了等效电路法和有限元法优化设计环形超声辐射器的详细过程。研究了耦合振动环形超声辐射器的谐振特性及其辐射声场特性,根据理论计算结果加工了相应的环形超声辐射器,实验测试结果与理论计算结果符合得较好。本文提出的模式转换环形耦合超声辐射器可望在声化学等液体处理领域获得应用。
A new type of coupled vibration circular ultrasonic radiator is proposed. The radiator is excited by a longitudinal vibration transducer and a horn to a metal ring of a certain size, so that it can effectively transform the longitudinal vibration into a radial axial coupling of the ring Vibrate to radiate the ultrasonic waves radially and axially of the ring, and form a focused sound field in the center of the ring. The equivalent circuit of the radiator is deduced, and the detailed process of optimizing the annular ultrasonic radiator by the equivalent circuit method and the finite element method is given. The resonant characteristics and the radiation field characteristics of coupled vibration circular ultrasonic radiator are studied. The corresponding annular ultrasonic radiator is processed according to the theoretical calculation results. The experimental results are in good agreement with the theoretical calculation results. The proposed mode-switching circularly coupled ultrasonic radiator is expected to be applied in the field of liquid chemistry such as sonochemistry.