Harmonic analysis of the current through the stem wall of plant materials

Abstract

A number of electrotechnological processes are based on the interaction of plant material and electric current of different densities and oscillogram types. Electrotechnological processes are effective if it is possible to reduce inefficient expenditures of electrical energy for heating of the treated material and to enhance its technological effect. At the same time, the materials, in particular the stem part of the plant, which are the object of processing, have a volt-ampere characteristic asymmetric with respect to the origin of coordinates. This fact is explained by the presence of heterogeneous structure of the longitudinal section of the plant stem membrane and is the reason for the emergence of periodic non-sinusoidal currents, the knowledge of their harmonic composition is an important scientific and practical problem which solution is aimed at reducing inefficient energy consumption for heating of the treated material. When a sinusoidal voltage is used, the total current consists of the sum of the forward and reverse components and may be represented by Fourier series. The goal is to represent the total current through the stem wall as a harmonic Fourier series. The dependence of direct, reverse components and total current as a whole on the parameters of the elements of the substitution scheme of the stem wall, on the frequency of voltage and electric field strength has been determined and can be represented by the constant component, first and second harmonics. However, the result of treatment of plant materials by electric current not related to heating is affected only by its technological component. At the same time, in practice it is possible to control the total current only.