ENERGY EFFICIENT DESALINATOR

Abstract

Objectives The aim of the research was the development of an ultrasonic generator of technological design with a wide frequency range of output voltage. Methods The prototype works were performed and the functional scheme of the multifrequency ultrasonic generator realised in the experimental sample was developed, as well as the design of an ultrasonic piezoceramic system capable of operating at two resonant frequencies of 22 and 44 kHz. Results Based on the feature analysis of the modern composite material structure and technologies for moulding products, it was found to be expedient to introduce ultrasonic impregnation into the technological process, which can ensure increased uniformity in filling the structure with a binder as well as greater homogeneity of physicomechanical characteristics. A schema for the ultrasonic generator built into the technological equipment is developed, providing the formation of harmonic signals with a frequency alternating from 20 to 60 kHz, and power adjustable from 100 to 500 W, which will allow the implementation of highperformance ultrasonic technologies for processing materials with a heterogeneous structure formed during the manufacturing process. The studies were carried out according to parametric optimisation of the converter taking into account the specific load types. A special feature of the generator's power supply is its versatility in terms of frequency and voltage ranges, as well as the required quality indicators of the energy generated. The generator allows the reference frequency to be programmed using a laptop and then fine-tuned from the control panel in resonance with the radiator with a resolution of 10 Hz directly. The built-in microprocessor allows the reference frequency entered from the laptop to be stored in the memory. Conclusion The use of multifrequency ultrasonic sources allows the acting parameters to be optimised for ultrasonic impregnation of fibre-reinforced composite materials as well as their finishing dimensional processing, depending on the density of the structure and the reinforcement scheme used.