Liashok A. Ultrasonic liquid spraying devices in mechatronics systems.

The thesis is devoted to solving problems of expanding the operating parameters range of ultrasonic dispersers to produce a fine aerosol in mechatronics systems. The analysis of the known spraying methods and their use in various technological processes is represented in the paper. There is refined physical model of ultrasonic spraying in a thin layer that applies the latest results of modern experimental researches in the field. In the paper it is represented the energy balance that shows the influence of separate parameters on the final product - liquid spray. Also was developed the engineering method for ultrasonic disperser calculation that originally allows to set up the required performance, dispersivity and shape of the spraying surface. It was experimentally proved that capillary waves influence on the spraying surface and helped to confirm the adequacy of analytical dependencies for aerosol dispersion calculation. The process of the experiment planning included the use of the possibility theory. It is experimentally proved that the overpressure does not depend on the aerosol dispersion and the performance linearly decreasing by ultrasound spraying in the pressurized chamber, thus, it confirms the results of the analytical study. In the thesis was proposed the use of pulse width modulation in the electronic excitation system of the ultrasonic transducer to regulate the disperser productivity by ultrasonic spraying in a fountain, thus, it is experimentally proved the feasibility of such regulation. Also, there was represented a set of technological processes that incorporate ultrasonic liquid spraying in modern mechatronic systems.