INDUCTIVE PARAMETRIC EDDY-CURRENT TRANSDUCER (IPEP) FOR MEASURING ELECTRICAL AND TEMPERATURE PARAMETERS OF WASTEWATER FROM BREWING PRODUCTION

The possibility of using the theory of operation of a differential inductive parametric eddy-current transducer (IPET) for measuring the electrical and temperature parameters of a sample of acidic and alkaline wastewater is investigated. The need for the development of new informative methods for measuring the physicochemical parameters of wastewater is proved, in the realization of which a promising method of purification is selected. On the basis of a differential scheme for switching on two parametric converters: with exemplary purified water and a converter in which a test tube with a sample of waste water from a brewing production is placed, a differential informative method for measuring the electrical and temperature parameters of the liquid under study is proposed, which is based on the analysis of the components of the difference signal of phase shift angles measured electrical components of the switching circuit signals. The basic relationships that describe the operation of the IPET with the sample of the controlled liquid are given. The scheme of switching on differential IPET with a liquid sample, which is placed in a glass test tube, is considered; the differential scheme provides for heating the sample during measurements to simulate the production conditions of brewing production. Universal transformation functions are given that relate the components of the IPET signals with the specific electrical conductivity χt.s. and the temperature t of the wastewater sample from brewing production, that is, the dependence of the phase difference signal Δj on the generalized parameter A and the dependence of the absolute increment in the specific electrical conductivity Δχ on the temperature t of the wastewater sample, in the investigated temperature range.

Synchronization via Fractal-Fractional Differential Operators On Two-Mass Torsional Vibration System Consisting of Motor and Roller

Due to increasing demand of lightweight shafts from industries, the drive systems are crucially demanded for larger inertias of motors and load machines because of control structures for the electrical equipment. The mathematical modeling of two-mass torsional vibration system consisting of motor and roller has been proposed via newly presented fractal-fractional differential operators. The dynamical model of the electromechanical coupling main drive system of rolling mill is based on total kinetic energy and potential energy on the basis of two degree-of-freedom. The fractal and fractional evolutionary differential equation containing nonlinearity have been investigated for the derivation of numerical schemes. Three types of numerical schemes say Caputo differential scheme, Caputo-Fabrizio differential scheme and Atangana-Baleanu differential scheme have been established through Adams-Bashforth-Moulton method. In order to check the stability and effectiveness, we presented the chaotic comparison of Caputo fractal-fractional operator, Caputo-Fabrizio fractal-fractional operator and Atangana fractal-fractional operator on the basis of dynamical embedded parameters (vibration angle, rotational speed, stiffness coefficient, load friction damping torque and few others).

Modeling Mechanical Properties of Multilayer Coatings TiAlN

The paper outlines two approaches (the ANSYS finite element modeling and the differential scheme of the self-consistency method) to model the mechanical properties of TiAlN multilayer coatings. To validate the experimental results, these findings were compared with the nanoindentation test results for single and multilayer coatings. This work has revealed the effect of Ti/Al ratio on the mechanical properties of multilayer coatings. The given approaches could be applied to calculate, with an acceptable margin of error, the mechanical properties of TiAlN multilayer coatings.

NUMERICAL ALGORITHM OF COMPUTATIONAL EXPERIMENT OF THE APPLIED OPTIMAL CONTROL PROBLEM IN SYSTEMS WITH DISTRIBUTED PARAMETERS

Stages of computing experiment of the developed algorithm by means of the final and differential scheme for the solution of applied problems of optimum control of the processes described by the solutions of elliptic type are given n article.

Self-Oscillatory Processes in a System of Two Electromagnets Connected Аccording to a Differential Scheme

A number of modern technological processes can be significantly intensified by applying vibratory excitation in a wide range of oscillation frequencies and amplitudes. In many cases, an electromagnetic vibration exciter (EMVE) may serve as the most effective source of vibration, especially at power levels up to several kilowatts and more; push-pull EMVEs developing a non-pulsating and sign-variable exciting force are considered to be the most appropriate ones. The excitation of self-oscillations in a system of two electromagnets connected according to a differential scheme, which allows the range of operating frequencies to be widened and the system power capacity to be increased, is analyzed. An equation describing the interaction between the EMVE mechanical vibration subsystem and the power supply system is given. A method for analyzing a dual-circuit self-contained electromechanical system (EMS) taking into account electromechanical links is developed. It is pointed out that during operation in the autonomous mode one stable state ensuring frequency stability is realized.

Mathematical models of single-phase long lines

Most simulation packages provide long line models containing only two input terminals and two output terminals. These models allow testing transient states initiated by the occurrence of interference at the ends of the line. For this reason, it is not possible to study disorders occurring at any point of the electrical network. The article describes in detail the mathematical models of the long line, their implementation in the Matlab environment and exemplary results of computer simulations. Keywords: power line, state variables, differential scheme