模式转换环形耦合振动超声辐射器

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。 

Ultrasonic circular ring radiator with vibration mode-conversion in coupled vibration

This paper presents a new ultrasonic radiator,which consists of a transducer,an ultrasonic horn,and a metal circular ring.The transducer and horn in longitudinal mode are used to drive a metal circular ring which vibrates in coupled vibration mode from both the radial and axial.The circular ring can effectively transform the longitudinal vibration into the radial-axial coupled vibration and generate ultrasound in the radial and axial directions of the circular ring,meanwhile,the ultrasound can be focused to form focused ultrasound field inside the circular ring.The equivalent circuit of ultrasonic circular ring radiator is deduced.Then the geometrical dimensions of the radiator are optimized,and the resonance characteristics and radiated pressure field of an ultrasonic circular ring radiator are investigated by using the finite element package ANSYS.Finally,an ultrasonic circular ring radiator has been designed and fabricated.The experimental results are in good agreement with the calculated ones.The new ultrasonic radiator has good potential to be applied in liquid processing such as sonochemistry.