Wyniki 1-1 spośród 1 dla zapytania: authorDesc:"Vladimir DIAGILEV"

Generator modes for technological installations with variable parameters of the oscillating circuit DOI:10.15199/48.2019.04.33

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In technological installations for ultrasonic machining (USM), piezoelectric and magnetostrictive transducers (PET and SME) of electric oscillations are used in mechanical deformation of the medium with processed products as executive bodies in various technological processes. To generate electric oscillations, specialized generators (inverters) are used. Technical characteristics and operating modes of this generator are subject to special requirements. Generally, the PET is a package of piezoceramic washers with a diameter of 20 to 120 mm and a thickness of 3 to 10 mm, reinforced with metal straps. When the piezo packet is generated by electric oscillations due to the secondary piezoelectric effect, its bends occur and mechanical oscillations arise [1]. For example, in engineering technologies where ultrasonic treatment is applied, a variety of operations can be performed. Such as:  Cleaning and washing products,  Cutting, microwelding, brazing,  Shaping of parts from hard or brittle materials,  Hardening of the cutting tool,  Actuation of a percussion instrument. In technological installations, especially where percussion impacts on the tool are used, there is a sharp change of the load PET. This affects the generator operating modes. It is known [2,3] that piezoceramics possess a very high electromechanical Q-factor and its resonance characteristic is very sharp, so if the frequencies of the feeding generator and the instrument do not coincide, emergency regimes may arise. In this case, the generator will operate in modes from idle to short circuit, which is accompanied by the occurrence of either over voltages or over currents in the circuit. Formulation of the problem On the assumption of the foregoing, it is possible to determine a number of requirements for supplying PET generators capable of operating both on a regular basis and in emergency conditions:  Sinusoid[...]

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