Study on a new type of Cymbal ultrasonic transducer

A new type of Cymbal transducer is presented.Compared with traditional Cymbal transducer,the piezoelectric disk in radial vibration is substituted by a combination of a piezoelectric disk and a metal ring.In this paper, the radial vibration of the combination of a piezoelectric disk and a metal ring is analyzed and its electro-mechanical equivalent circuit is obtained.Based on the radial equivalent circuit,the electro-mechanical equivalent circuit for the Cymbal transducer is derived,and the resonance and anti-resonance frequency equations are obtained.By means of numerical method,the vibrational characteristics of the Cymbal transducer are analyzed.The relationship between the geometrical dimension and the resonance frequency,the anti-resonance frequency and the effective electro-mechanical coupling coefficient is obtained.The vibrational modes are analyzed and the admittance-frequency characteristics are given.It is shown that the new Cymbal transducer has the advantages of large geometrical dimension,high mechanical strength and large power capacity.It is expected to be used in high power underwater sound projector and ultrasonic radiators in liquid process.