Vestnik of Samara State Technical University. Technical Sciences Series

In conditions of considerable diversity production range the leading part is removed to the determination of the sequence of the launch-release of the parties of objects. Development of methods of sequence of work tasks is one of the key tools of lean manufacturing. Mathematical model of determining the optimal sequence are of limited use. Heuristic approaches are simple and easy enough to fit into the constraints of a different nature. Represented disciplines of designation make it possible to establish the complex of priorities in the process of development of production schedule. The main objective of the company's management - development of some combination of priorities that enhance the efficiency of production processes. The selection of the optimum sequence of fulfilling the operations ensures the observance of the principles of the rational organization of production.

Before the oil and gas industry faces the challenge of increasing productivity of existing resources. Development and research of new methods, mathematical models and algorithms of management of technological process of oil separation is aimed at the solution of this problem that causes the relevance of the work performed. The proposed method is based on indirect measurement of density of oil and gas mixture with subsequent correction of the readings according to the results of measurement of the density of already separated oil. The method is based on a more progressive gradient model the phase transition between layers of oil and gas mixture. Provides analytical expressions to determine the average velocity of the oil globules of various fractions. To determine the time of formation of the solid phase layer is made of simulation modeling in the software environment LiteSMO. The control algorithm of technological process of separation is made in the form of a diagram of the actions of the UML standard. Application of the developed method, mathematical models and algorithms will improve the efficiency of management system preparation of oil, which has great practical significance for the oil and gas sector of the domestic economy.

Considered time-optimal controller for the cyber-physical system. The quality of solutions includes the total time of moving the object at a given point, including the time of the calculation of the control program. Considered online and offline versions of the numerical determination of controller as a system of rules "condition - action". As online variant any-time genetic algorithm was used. A comparison of online and offline methods was hold.

Investigated a method of measuring the integral characteristics on the instantaneous values of the input and additional harmonic signals. A method provides defining characteristics on instantaneous values of signals, measured simultaneously once per period at the moment of transition of one of the additional voltage through zero. The results of the analysis of influence of quantization of instant values of signals at the error of the result of the determination of informative parameters are shown. It is established that this type of error depends not only on the width of analog-to-digital converters but also the phase angle of the additional signals. The obtained results allow to determine the optimum angle of phase shift depending on the requirements of measurement accuracy.

Investigated a method of measuring the integral characteristics on the instantaneous values of the input and additional harmonic signals. A method provides defining characteristics on instantaneous values of signals, measured simultaneously once per period at the moment of transition of one of the additional voltage through zero. The results of the analysis of influence of quantization of instant values of signals at the error of the result of the determination of informative parameters are shown. It is established that this type of error depends not only on the width of analog-to-digital converters but also the phase angle of the additional signals. The obtained results allow to determine the optimum angle of phase shift depending on the requirements of measurement accuracy.

At present in Russia there is no continuous monitoring of the set number of light sources, characteristics and energy consumption for lighting . This complicates the planning of production and introduction of energy-saving light sources. Estimation of the total number of installed lamps and the electrical energy consumption for lighting both in Russia as a whole and by sectors: residential buildings, commercial buildings, industrial buildings, agricultural sector, transport sector and outdoor lighting. To verify the results a method of calculating the total number of installed lamps based on the capacity of lamps market was proposed. Comparison of the results shows a good convergence of both methods. The obtained results allow to organize continuous monitoring of energy efficiency of power consumption on lighting in Russia and more reasonably develop plans for implementation of energy-efficient light sources.

The paper discusses how to optimize the voltage level on the consumers' buses using static capacitor batteries, increasing the capacity of transmission lines and by implementing distributed generation sources. As well as organizing the scheduling of existing and newly introduced electric elements in order to create an active-adaptive system and ensure the reliability of electricity supply to consumers. As a control system is marked the possibility of using multi-agent system with the necessary flexibility and adaptability to changing conditions.

In this paper the azide technology of self-propagating high-temperature synthesis for receiving nitrides is considered. Advantages of this technology are emphasized. The optimal chemical equations and conditions to obtain silicon nitride are chosen. SНS technology perspectives for receiving quality nanopowders are shown. The results of experimental and theoretical researches of synthesis process of silicon nitride micro- and nanopowders in «хSi + (NH4)2SiF6 + 6NaN3» system in the combustion mode are presented. Combustion and synthesis properties are determined. Silicon nitride micro- and nanopowders particles morphology is studied. The optimum chemical equation is: «14Si + (NH4)2SiF6 + 6NaN3».

This paper presents the research results of the relationship of surface activity of demulsifiers and efficiency of their actions. Selected commercially available demulsifiers are used, which differ significantly on surface activity (critical concentration of micelle formation and interfacial tension on the boundary "oil - water solution of demulsifier"). The results of experimental studies have shown the relationship of critical concentration of micelle formation of aqueous solutions of demulsifiers with the degree of dehydration of oil and the kinetics of free water release. These results can be used for testing the reagents to select the optimum demulsifier.

The experimental technique on self-propagating high-temperature synthesis (SHS) of composite titanium carbide and silicon or niobium powders was developed. The synthesis in a mode of burning powder compositions with different percentages of initial reagents was made. The combustion temperature measurement was given. The final products of synthesis were analyzed by electron microscopy and X-ray diffractometry. As is shown SHS products are compositions of ultrafine and nanosized particles of pure target phases TiC-SiC and TiC-NbC, combined into micron size agglomerates.

The possibility of improving the accuracy of the calculation of a powerful inductor of rectangular shape, for heating slabs of aluminum alloys before rolling is considered taking into account the installation size and electricity system complexity and equipment. The failure cost may be very high. Therefore, without neglecting the analytical and numerical calculation methods, it is advisable to use the physical modeling. The simulation possibility of induction units of industrial frequency on physical models with a frequency of 2500 Hz is shown. This allows to reduce considerably the dimensions of the unit, without changes the characteristics of energy and thermal processes. Also in the case of physical simulation the temperature dependences parameters of the inductor and the heated slab are naturally taken into the consideration.

This paper is devoted to modernization software that allows check the correctness of gas and liquid properties models. After modernization this software can compare calculated phases compositions with available experimental data and find the optimal binary coefficients values. This software can help the process developers to choose equation of state and binary coefficients in each specific case. Also this paper contains a comparison example of calculated and experimental compositions in "methane - pentane" system.

The questions of synthesis of control algoritms for metal-processing machines under the condition of mass-production are studied. As an example, consider the technological process of plunge-cut grinding. The necessarity of consideration of stochastic parameters of process under the restrictions on phase coordinates by quality factors is shown. The limit abilities of different algorithms' classes are analyzed. The problems of algoritm synthesis for technological processes of operating essential parts are considered and penalty function for parameter optimization the conditions of decriasing of durability is introduced. The problem of profit of efficiency under the usage of such algoritms is studied.