Method for calculation of piezo-ceramic transducer transmission characteristics in the mode of ultrasonic waves excitation. Part2. Calculation of coefficient of mechanoacoustical converters in mode of normal Lamb wave excitation
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Abstract
Based on the general solution of the problem of Lamb waves excitation by the system of volume and surface loads constructed mathematical model of electro-acoustic transducer with circular piezoelectric element, a mechanical contact of its with an isotropic plate is carried out through the matching layer of fluid. It is shown that the one-way access to the plate equally effectively excited both symmetric and asymmetric Lamb waves. Found that the radial size of the mechanical contact is a significant effect on to efficiency of given wavelength ultrasonic vibrations excitation. Introduced and given the interpretation of the physical meaning of the concept "wave converter characteristic." The kinematic characteristics of symmetric and asymmetric Lamb waves have investigated. It is shown that the transducer with a small disc diameter, compared to the plate thickness, effectively excites the first symmetric and first asymmetric Lamb waves, which together form surface wave Rayleigh-type waves. The higher normal Lamb waves have an order lower levels that generates on electrical output of the ultrasonic wave receiver noise similar signal.
Reference 4, figures 7.
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References
Petrishchev O. N, Sharapov V. M, Romanyuk M. I, Sotula Zh. V. (2014), “Method for calculation of piezo-ceramic transducer transmission characteristics in the mode of ultrasonic waves radiation. Part 1”. Electronics & Communications. Vol. 19, No. 4(81). Pp. 67-82. (Rus)
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