Влияние геометрической формы демпфера на эффективность работы ультразвукового пьезоэлектрического преобразователя

Abstract

Purpose of the work: To evaluate the influence of the geometric shape of the damper in the form of a truncated cone on the efficiency of the ultrasonic piezoelectric transducer. Materials and methods: Numerical and experimental modeling of the processes of propagation of ultrasonic signals in the damper of an ultrasonic transducer was used. Results: A damper in the form of a truncated cone is considered, the generatrix of which has an angle of inclination α with respect to the diameter of the piezoceramic plate. The shape of the damper in the form of a truncated cone is chosen based on the a priori assumption that this contributes to an increase in the path of the wave in the damper material due to numerous reflections inside it. A criterion for the efficiency of the damper is proposed. Theoretically and experimentally, the optimal (from the point of view of the efficiency of the damper) value of the angle α was determined. The technology of its manufacture is described. A satisfactory agreement between the results of theoretical and experimental studies was noted. Conclusion: The efficiency of a conical damper filled with a mixture of tungsten powder and KDA resin in a 1:1 ratio is higher than that of a cylindrical damper. A damper made from such a mixture can be effectively used in the manufacture of converters with a frequency of at least 2.5 MHz. For lower frequencies, it is required to select a different damping composition with a different filler or with a different ratio of its constituent components. The maximum efficiency of a cone damper is achieved when the cone generatrix is tilted α = 64…66.