For ensuring both the high amplification coefficient of the stepped horn and the high fatigue strength at the sudden change section of the curve transition horn,this paper proposes an ultrasonic horn based on the fastest curve transition section,a series of tests are carried out on the ultrasonic knife acoustic system equipped with the ultrasonic horn.Firstly,based on the equivalent circuit method,the basic structure of sandwich piezoelectric transducer and fastest curved luffing rod is designed.On this basis,combined with the working conditions and material characteristics of Ultherapy,the basic structure of transducer-luffing rod is accurately designed.Then,the transducer longitudinal vibration frequency and frequency response curve are obtained by finite element method and experimental method,which further demonstrates the effectiveness of the transducer designed in this paper.Finally,a series of tests are carried out on the designed transducer.The results show that the resonant frequency and output amplitude of the ultrasonic knife transducer with the fastest curve are consistent with the design objectives and simulation results.After the load is connected,the coagulation and cutting effect are good,which meets the design requirements.
关键词
超声换能器/等效电路/有限元法/谐振频率
Key words
Ultrasonic transducer/Equivalent circuit/Finite element method/Resonance frequency
维普
万方数据