Vestnik of Samara State Technical University. Technical Sciences SeriesVestnik of Samara State Technical University. Technical Sciences Series1991-85422712-8938Samara State Technical University10989310.14498/tech.2022.2.1Research ArticleAutomatic control system of modular induction complex for heating viscous liquidDanilushkinAleksandr I.<p>Dr. Sci. (Techn.), Professor</p>aidanilushkin@mail.ruDanilushkinVasiliy A.<p>PhD (Techn.), Associate Professor</p>aidanilushkin@mail.ruSamara State Technical University160820223026201508202215082022Copyright © 2022, Samara State Technical University2022<p><em>The article deals with the controlling problem for the indirect induction heating process of viscous non-conductive liquids during their transportation through a pipeline system. Complex nonlinear processes occurring in the system induction heater metal pipe wall fluid flow characterize the plant. Due to the complexity of the process and the impossibility of obtaining transfer functions in an analytical form, we use transition functions obtained by calculation using a numerical model to evaluate the dynamic properties of the plant. The significant technological restrictions imposed on the process parameters complicate the effective control system implementing. These restrictions include, first of all, the restriction on the maximum temperature of the liquid boundary layer in contact with the heat transfer surface of the pipe. The technological requirements implementation is only possible in a multi-section heater with autonomous power sources. Significant non-uniform temperature of the fluid flow due to low thermal conductivity makes necessary distributed temperature measurement to estimate the mean temperature in the controlled flow cross section. The study of the dynamic properties of the heater is carried out with relation to the liquid temperature at certain fixed points of the flow cross section at the outlet of each heater section. It is noted that an adequate assessment of the mean flow temperature over the cross section, it is sufficient to have four control points for which the parameters of the transfer functions are determined. To calculate the mean temperature over the flow cross section, the experimentally obtained dependence is approximated by a piecewise linear function consisting of straight-line segments with ends at the temperature measurement points. The paper presents a structure model of the plant consisting of three heating sections. The block diagram of each section of the plant is a set of elementary links aperiodic and delay links. 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