Vol 23, No 4 (2015)

Articles
Method of adaptive planning of communication sessions for the ISS orbit correction
Kalashnikov D.A., Solovyov V.A., Skobelev P.O., Simonova E.V., Tikhonov D.I., Vorozheikin V.N.
Abstract
The paper presents a detailed example of adaptive planning of communication sessions for the International Space Station (ISS) orbit correction. The description of both the ISS orbit correction scenario and the criteria of its planning are provided. A conceptual model of flight operations planning is designed, as well as the description of the criteria and constraints of task execution in a group flight operation. The input and output data are described. The ISS orbit correction scenario is modelled.
Vestnik of Samara State Technical University. Technical Sciences Series. 2015;23(4):7-17
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Structural modelling of trunk pipeline technology for scada processing. the optimization of calculation tasks for plc
Kitov A.A., Tyan V.K.
Abstract
The paper gives examples of the graph theory practical application in structural mathematical modeling of complex units of trunk pipeline transport. The necessity to use the graph theory is due to the large number of possible pipeline connections between its units (valves, pumps, tanks), which complicates solving actual problem of the determination of threats to shut off the flow in real time. The use of mathematical models will allowimplementing the algorithmic processing of data flows and technological processes control.
Vestnik of Samara State Technical University. Technical Sciences Series. 2015;23(4):18-26
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The architecture of the web-based platform for personalized medicine
Orlov S.P., Zolotov V.P., Yakimov A.V.
Abstract
The paper deals with the problem of modern information technologies in the public health system. It is shown that the human genome should be placed to the heart of the modern information system designed on the basis of the web-based platform of personalized medicine. The requirements to the web-based platform tools are formulated. The basic modules which comprise thefunctionalof theweb-basedplatform are outlined. The paper offers the architecture of the web-based platform and describes the principles of the projectscaling. On the basis of the three-tier client-server architecture analysis, a stack of techniques requiredfor the projectis selected. The issues of horizontal scaling and system-time scaling are discussed. The principles of designing an intelligent decision support system as part of the web-based platform are proposed.
Vestnik of Samara State Technical University. Technical Sciences Series. 2015;23(4):27-33
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Definition parameters of mathematical model of the distillation process ethanolamine
Peskov N.P., Moncharzh E.M., Popov A.A., Kuligina N.O.
Abstract
The problem of parametric identification of the mathematical model of the process of rectification of ethanolamines in the known structure of the object and the unknown parameters of the process of mass transfer in the system of diethanolamine-triethanolamine. A mathematical model of the process is an analytical description of the fundamental laws of mass transfer. The unknown parameters of the model proved to surround the mass transfer coefficient and the coefficients according to a formalized, describing the vapor-liquid equilibrium in the system, diethanolamine-triethanolamine. Directly measure these parameters is not possible. Therefore, it was proposed settlement and experimental identification method to estimate the parameters of the model based on minimizing the sum of squares of the differences between the calculated and experimental values of the output of process parameters on a series of experiments. Identification results of the experiment conducted on an industrial plant for the separation of a mixture of diethanolamine-triethanolamine packing type distillation column. Testing of the developed mathematical model and prove its value, and shows the future direction of its use in optimal control problems.
Vestnik of Samara State Technical University. Technical Sciences Series. 2015;23(4):34-42
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Analyzing the error of the implementation ofthe method for determiningseparately the parameters of a capacitive displacement sensor due to the non-ideal measuring circuit
Melent’ev V.S., Levina K.D., Susova E.A.
Abstract
This paper discusses a new method of measuring capacitive sensors parameters by the transientsinstantaneous values inthe sections of a measuring circuit comprising two model elements. In contrast to the known methods based on the determination of thecapacity of the individualtransients instantaneous values, the implementation of the method provides a separate determination of both the capacity and insulation resistance of a capacitive sensor and the resistance of the conductor connectingthe sensor to the measuring circuit. It improves the accuracy of the information parameter measurement. A block diagram of the measurement tool which implements the method is offered. The results of the analysis of theinfluence of thetransients instantaneous - values quantization on the capacity determinationerror are presented. Using the results obtained, it is possible to make the optimal choice of blocks in accordance with the requirements for measurement accuracy.
Vestnik of Samara State Technical University. Technical Sciences Series. 2015;23(4):43-49
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The analysis of the instrumental error of the system for measurement harmonic signals parameters based on the comparison of signals orthogonal components
Jaroslavkina E.E., Muratova V.V., Pozdeeva E.V.
Abstract
A new method of measuring the parameters by theharmonic signals instantaneous values which is based on the comparison of the voltage and currentorthogonal components is discussed. Through the use of the spatial separation of thesignals instantaneous values, the measurement time is reduced. The use of the signals orthogonal components ensures the simplification of the measurement algorithm and reduction of the hardware costs. A block diagram of the informationmeasurement system implementing the method is described. One of the disadvantages of the systems using the auxiliary-signals formation is the possibility of the voltage error or modulo error of the phase-shifting unit. The results of the analysis of the phase-shifting unit modulo error are given, showing a significant dependence of this error on the phase shift angle between the voltage and current.
Vestnik of Samara State Technical University. Technical Sciences Series. 2015;23(4):50-55
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The analytical and experimental research of a controlled-damper vibration isolation system
Abakumov A.M., Chebotkov E.G., Randin D.G.
Abstract
The paper deals with a vibration isolation system with an actuator in the form of a magneto-rheological damper. A calculation scheme of a single-mass single-degree-of-freedom vibration system is presented. On the basis ofthe obtained differential equations of the vibration systemdynamics, a structural scheme for the investigation into its dynamic performance is designed. On the developed experimental apparatus, the study of the vibration system dynamics under the conditions of the discrete change of the controlling actionon the actuator is made. The experimental values of the relative amplitude of the protected object movement are received for the various vibration frequencies. The experimental data received are approximated by the analytical expression of the amplitude-frequency response. The constant and variable efforts appearing on the damper rod are calculated. On the basis of the calculated data is established the dependence between an increasein the controlled-damperresistance force and an increase in the damper-coilcurrent.
Vestnik of Samara State Technical University. Technical Sciences Series. 2015;23(4):56-60
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Induction system for removal of thermal stresses in the pipe after welding
Bazarov A.A., Chigirev D.Y.
Abstract
The problem of calculating the parameters of a pipe induction heaterto removethermal stresses after welding is discussed. In welding, many materials are supposed to be pre-heated to avoid the development of harmful thermal stresses.Despite such arrangements, there is a problem of removing residual stresses. In the heater’s design and operation mode, the consideration of the two-stage development is required for decreasingtheweight and dimensions, and for better coordination with the power supply. Using the rigid structure allowsensuring the inductor parameters independence from the production quality of the insulating layer between the pipe and heater.The sectional structure of the inductor ensures easy installation, and reliability. The selected frequency and power of the inductor can solve the problem of the coordination with the power supply without a transformer. Magnetic ferrite isapplied in the design of the inductor, which made it possible using a two-section lap winding.
Vestnik of Samara State Technical University. Technical Sciences Series. 2015;23(4):61-69
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The analysis of the error in the reproduction of the predetermined path of a zero-order predictor position-tracking electric drive
Lysov V.E., Sidorov I.S.
Abstract
Position-tracking systems with numerical control are fundamental for the synthesis of electric drives for metal-cutting machines and, in particular, for jig-boring high-precision machine tools. In the structure of such systems,CNC commands are transferred to the power amplifiers feeding the machine moving-parts electricmotors by means of a zero-order predictor. The latter’s discreteness causes an error in the reproduction tasks in dynamic modes, which are typical of the processing of complex - profile products. The paper deals with the estimation of the dynamic error coming from the discreteness of the predictor, and provides recommendations on the formation of the tasks for the implementation of the constant (predetermined) productivity technological process.
Vestnik of Samara State Technical University. Technical Sciences Series. 2015;23(4):70-75
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The application of thermodynamic calculation for the monitoring of the characteristics of gas-distributing-unit gas-turbine drives
Gulina S.A., Gulina A.S.
Abstract
The paper discusses the question of thermodynamic calculation of drive gas-turbine engines (GTE) working on natural gas for gas-distributing units (GPU)of compressor stations of the gas-trunkpipelinecompressor stations. A mathematical model of the determination of combustion-products heat-physical characteristics is developed for various-composition natural gas of a number of gas fields. A new algorithm and thermodynamic-calculation program which is applicable both for the determination of thenew-type GTEcharacteristics and for the monitoring of the parameters of engines operating on variable-composition fuel gas pipelines.
Vestnik of Samara State Technical University. Technical Sciences Series. 2015;23(4):76-84
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The research of the heat-transfer during the flowing of liquid in a cylindrical channel
Eremin A.V., Kudinov I.V., Abisheva L.S., Zhukov V.V.
Abstract
Using the integral method of heatbalance, was developed a method of analytically solving the problem of heat-transfer for liquid flowing in a cylindrical channel under first-type boundary conditions on the pipe walls. This method is based on the use of an additional sought-for function and additional boundary conditionsdetermined in such a way that the sought-for function would satisfy the original differential equation in the boundary points. The additional sought-for function shows the temperature changing in the centre of the pipe as depending on the longitudinal variable. Because of the heat-propagation infinite speed described by a parabolic equation of heat-conduction, the temperature in the channel centrewould change immediately after the application of first-type boundary conditions onthe cylindrical channel surfaces. Therefore, the region of the additional sought-for function change includes the entire temperature and longitudinal spatial-variable change range. This approach allows the solution of partial-derivatives differential equation to be reduced to the integration of an ordinary differential equation with respect to the additional sought-for function only depending on the longitudinal variable. The paper shows that, through the use of the additional sought-for function and additional boundary conditions, and with the increasing number of the sought-for solution approximations, the original equation would be satisfied not only at the region boundaries (via the implementation of the additional boundary conditions), but also inside that region.
Vestnik of Samara State Technical University. Technical Sciences Series. 2015;23(4):85-92
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An investigation into thermal processes in a combined autonomous generator by means of modelling temperature fields
Makarychev Y.A., Zubkov Y.V., Ivannikov Y.N.
Abstract
The paper presents the results of a study of stationary temperature fields in a low-power synchronous generator. Combined generators are used to power mobile machines: vehicles, tractors, military vehicles. The main requirement for these generator sets is to ensure a predetermined power with limited overall dimensions and internal-combustion engine thermal effects. The paper examines various ways of generator cooling and provides recommendations to reduce the overheating of the machine most heated points to an acceptable level.
Vestnik of Samara State Technical University. Technical Sciences Series. 2015;23(4):93-100
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The application of silicate-enamel coatings for oil-field pipelines
Artushkin V.N., Avdeyev V.M.
Abstract
The paper discusses the problems of oil-field pipeline corrosionprotection. In oil fields, a special danger consists inthe pipeline internal corrosion, as the pumped aggressive liquid has a high-rate mineralization, high concentration level of hydrogen sulfide, carbon monoxide and other impurities. The problem of corrosionprotection can be solved by application of pipes with a silicate-enamel coating. The paper deals with an installation for applying a silicate-enamel coating for the internal welded-seamprotection. The conducted research of pipe silicate-enamel coatings has showed that with the coating thickness of 300 - 400 microns, the ensured corrosion protection of the pipe primary metal is up to 40 years.
Vestnik of Samara State Technical University. Technical Sciences Series. 2015;23(4):101-106
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The development of an industrial detergent to remove asphaltene-resin-paraffin deposits from the inner surfaces of industrial pipelines and equipment
Konovalov V.V., Sklyuev P.V., Titkova M.S., Tatarinova E.E., Dalke A.G.
Abstract
The work presents the analysis of the composition of asphaltene-resin-paraffin deposits formed on the inner surfaces of industrial pipelines and pump-station equipment. An industrial detergentis developed using a surfactant aqueous solution, hydrocarbon fractions, and alcohol. The industrial detergentphysico-chemical properties are determined, and estimation of technical detergent solvent property with respect to the investigated asphaltene-resin-paraffin deposits is worked out. Theindustrial detergent activity efficiency is investigated, and the technique of its application for piping and equipment cleaning is developed. Estimating the influence of the industrial detergent and its application technique on the quality of the pumped diesel fuel is made.
Vestnik of Samara State Technical University. Technical Sciences Series. 2015;23(4):107-115
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The determination of mechanical characteristics of polymerscomprising a flexible pipe
Sinugin A.A., Oparin V.B., Petrovskaya M.V.
Abstract
The paper describes the structure of a flexible pipe used in oil fields. Themechanical properties of the three materials comprising the pipe structure(polypropylene, polyvinyl chloride, and high-density polyethylene from which the pipe hermetic inner chamber, damp proof layers, and load-bearing components are made respectively) are studied. The selected objects of study are to determine the tensile stress of the materials in question, as well as to determine the efficiency of polypropylene twine twisting during the pipe assembly.Theproduction of the samples for material testing, and the test conditions are described, the photos of the samples being presented. The values of ultimate tensile stress, offset yield point and Young's modulus for each of the three polymers are obtained, the graphs of the dependency of loads on deformation magnitude being given.
Vestnik of Samara State Technical University. Technical Sciences Series. 2015;23(4):116-123
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A system model and knowledge base of an oil and gas field developmentproject
Gubanov N.G., Kimlyk A.A., Sizava N.A.
Abstract
The paper describes a system model of oil and gas field development projects. A frame model for designing a knowledgebase of oil and gas field developmentprojects is offered. The knowledge base is established on the completed projects and allows using the entire background and experience of design research institutes. The approach to knowledge-basedesigning is based on the compactness theorem. The theorem uses certain initial conditions and can predict the way of new project developing, taking into account all the completed projects. The offered model allows making decisions on new projects in terms of economic efficiency, necessary skills and resources availability.
Vestnik of Samara State Technical University. Technical Sciences Series. 2015;23(4):124-129
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The analysis of the magnesium protector alloys destruction
Kats N.G., Konovalenko D.V., Vasilyev S.V.
Abstract
The paper deals with using magnesium alloys as protectors. The characteristics of the magnesium alloys used for tank corrosion protection are provided. The general views of protectors before installing them into the tank and after utilizationare presented. The characteristics of the usedpassivator base are offered. The results of the coating characteristics determination testing are shown. The paper also gives recommendations on the determination of the tank protector materials, their dimensions and their usage sphere depending onthe oil storage method. The authors come to the conclusions about using passivatorsfor corrosion protection.
Vestnik of Samara State Technical University. Technical Sciences Series. 2015;23(4):130-134
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Algorithm modification for vapor fraction calculation at gas-liquid equilibrium modelling
Konygin S.B.
Abstract
This paper is devoted to modification of vapor fraction calculation algorithm used in gas-liquid equilibrium solving. Drawbacks of traditional calculation algorithm are revealed and solutions are offered. Scheme and description of modified algorithm are presented. A testing of new algorithm reveals that solution reaches in 7-10 iterations. It is acceptably for technical calculations. A part of cases with more iterations amount to 3 %.
Vestnik of Samara State Technical University. Technical Sciences Series. 2015;23(4):135-139
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The simulation of a control system of multi-agent interaction distribution grids
Kubarkov Y.P., Kulaev I.S., Kubarkov I.D.
Abstract
The paper covers the basics of a data-analysis system for the design, analysis, and simulation of intelligent networks and control systems. The system comprises a graphical modeling environment, agents for the communication with the control system, instruments for data monitoring and visualization for the operator. This approach has the advantage of the possibility of the control system being tested and made optimal according to the modeling environment, and the final model can then be used in the control system to predict the distribution networkbehavior.
Vestnik of Samara State Technical University. Technical Sciences Series. 2015;23(4):140-144
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Optimal cooling system of polymer cable insulation at extrusion line
Mitroshin Y.V.
Abstract
The system of optimal programmed control of polymeric insulation cooling in extrusion line water baths with boundary control actions is developed. In a communication cables manufacturing process under specified restrictions the system provides required accuracy of final insulation temperature distribution in a bath of minimum length.
Vestnik of Samara State Technical University. Technical Sciences Series. 2015;23(4):145-148
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Stress-strain state of the pipe threaded connection with triangular thread under stretching
Papirovsky V.L.
Abstract
This paper is devoted to using of the finite element method for stress-strain state of the pipe threaded connection. A model of casing threaded connection (diameter 168 mm, thickness 8 mm) is created. A dependence of the butt-end move from the stretching force is determined. A comparison of the results with the traditional calculation method is followed. Also dependence of linear force from the number of thread is determined. It is achieved that pipe connection retains its properties only after single screwing. Also it is determined that the connection bearing strength is greater than the value determined by Yakovlev-Shumilov formula.
Vestnik of Samara State Technical University. Technical Sciences Series. 2015;23(4):149-153
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