Identification of the Parameters of a Discrete Gas-Lift Process

Journal of Computer and Systems Sciences International - A time-averaged mathematical model of a discrete gas-lift process is considered. At the first iteration, an analytical expression for the...     

Synthesis of a relay regulator with fuzzy switching times on the basis of a macro-variable

A method for the identification of the dynamic regimes of a controlled object on the basis of an analysis of a macrovariable of the form, square of the norm of the variable states, and its time derivatives is proposed. Fuzzy if-then rules for reversal of a relay control are constructed on this basis. Based on the total number of positions of the relay, all possible regimes are divided into “correct” and “incorrect.” The control strategy consists in control reversal upon the appearance of an “incorrect” motion regime.     

An approach to the synthesis of fuzzy stabilization systems with a priori unknown model of an object

A method of synthesis of fuzzy stabilization systems for a broad class of dynamic objects under the assumption that the mathematical model of the object is not known a priori is proposed. The control is formulated in the form of a proportional law of adjustment as a function of a macro-variable; the square of the Euclidean norm of the phase variables is adopted as the macro-variable. An analogous variable characterizes the distance of the object from the equilibrium position. Despite the simplicity of the control law, its sign remains constant due to the fact that the macro-variable is positive-definite over the entire phase space. The switching times of the signals are determined by fuzzy identification of the system’s dynamic modes on the basis of measurement of the derivatives of the macro-variable.     

Treating water for solid impurities using helical filter elements with dynamic perlite membranes

The work represents results of studying the process of creating dynamic perlite membranes on Krapukhin’s Filter Elements (KFEs). It has been shown that KFEs with pore sizes of 25–55 ?m are the most suitable for creating a perlite precoat layer. Test results of the installation based on four KFEs in advanced treatment of water for solid impurities at Mosvodokanal wastewater treatment facilities are represented. It has been shown that the application of KFEs with a dynamic perlite membrane allows one to treat water from solid impurities with an efficiency of over 98%.