Thickness vibration is a commonly used vibration mode of high frequency transducers.For a piezoelectric disc, coupling in lateral direction always exists, and there is no ideal thickness vibration mode; if its size scale is appropriate, lateral coupling is weak; if its size scale is not appropriate, lateral coupling is strong.Coupling can make a vibrator’s surface vibration displacement be inverse phase and its frequency response curve have multiple resonance peaks being difficult to distinguish, which has a negative impact on transmitting voltage response and directivity of the transducer, and has a larger impact on production quality of transducers using thickness vibration mode in a certain military project.Here, through theoretical study and simulation calculation of vibration modes and coupling vibration frequencies of a piezoelectric vibrator, the frequency optimization, the influence analysis of coupling weakening action on transducer and the test verification were performed.The simulation analysis and test results showed that the central hole has the obvious action of coupling weakening on modal vibrations of a circular disc high frequency transducer; it can improve the transmitting ability and directivity of the circular disc transducer to solve problems of low production quality and low yield of this kind of transducers.
Key words
thickness vibration /
coupling /
radial vibration /
transmitting voltage response /
directivity
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