Cherkassky O. Transients in electric circuits with a plasma erosive load.

The оbject of research: electric circuits with plasma erosive load. The purpose of research: development of the theory of transient processes in circuits with plasma erosive loads in order to increase the adequacy of their mathematical models by taking into consideration the features of electro-physical processes in such loads, which would increase the adequacy of transient processes calculations and analysis in the circuits with them when the initial conditions on their reactive elements and their parameters are changed in wide range, as well as the duration of discharge pulses. Methods of research: method of mathematical modeling of electrical circuits, numerical methods for the analysis of systems of nonlinear integro - differential equations, method of approximate analytical expression characteristics of non-linear elements, physical modeling of electromagnetic processes. Theoretical and practical results and innovations: for the first time, two relevant zones of the first mode of parametric dependence of the plasma-erosive load resistance were found and explained the electrophysical processes that prevail on each of them; a precise parametric model of plasma-erosive load resistance which considers newly found specific zones of its first mode and allows to increase the accuracy of calculations of transients in circles with plasma-erosive load was created; the existence of a local extremum of the dependence of mean value of derivative of power from the circuit inductance for limited discharge pulse duration was found. This allowed to solve according to this criterion the optimization problem of finding the discharge circuit inductance for known values of voltage pulses amplitude and its limited duration; a new effective method of filtering of nonstationary nonperiodic voltage signals on a plasma erosive load and current in it has been developed; the comprehensive and effective criteria for determining the required number of iteration of such treatment was proposed; a method for determining the duration of the first mode of parametric dependence of plasma erosive load resistance was proposed. A subject degree of introduction: are used in the G.V. Kurdyumov Institute for Metal Physics of the National Academy of Sciences of Ukraine and at the NTUU «I. Sikorsky Kyiv Polytechnic Institute» in the form of experimental equipment, SIMULINK and SIMETRIX models of nodes of discharge pulse processing systems of granular conductive media, and the recommendations for optimization of transients in electric circuits with plasma erosive loads. Effectiveness of implantation: increase of the accuracy of the prediction of obtaining plasma erosive particles with given properties and, as a consequence, to increase the energy and resource efficiency of the technological processes of obtaining such erosive particles. Sphere of use: electric discharge technologies, the educational process of the departments of the electrical engineering profile.