Abstract:
A new type of the cascaded variable section piezoelectric transducer was presented.The transducer was composed of two-section metal cylinder, one metal cone and two sets of axially polarized piezoelectric ceramic crystal stacks, which were connected in series mechanically and parallel electrically.The radius of the two ends of the transducer was much smaller than the longitudinal vibration size. Based on the one-dimensional theory, the electromechanical equivalent circuit of the transducer was derived and the resonance/anti-resonance frequency equations were obtained. The fundamental mode and the second mode of the transducer were analyzed. The dependency of the resonance/anti-resonance frequency and the effective electromechanical coupling coefficient on the distance between two piezoelectric stacks were studied. The dependency of the resonance/anti-resonance frequency and the effective electromechanical coupling coefficient on the dimensions of metal cone were obtained.The calculated results of resonance/anti-resonance frequency were compared with COMSOL simulation results. The results showed that the simulation results agreed with the calculated results.
