Vol 26, No 2 (2018)

Articles
Research of the dynamics of the multidimensional systemof automatic control of the technological processof ceramsite burning
Galitskov K.S., Galitskov S.Y., Samokhvalov O.V.
Abstract
Existing problems of controlling the technological process of burning ceramsite of a certain grade in strength (or density) in a rotary kiln are considered, due to a limited number of control actions and incompleteness of information on the temperature field in the «manual» kiln control. It is proposed to use a multidimensional automatic control system for ceramsite burning consisting of three interconnected channels: control of the volumetric capacity of the burner, the loading of the raw material, and the speed of rotation of the kiln. Each of these channels controls the temperature of the ceramsite in the corresponding section of the kiln and thus forms the necessary burning curve. The developed system allows not only to stabilize the strength (or density) of the ceramsite manufacturing, but also ensures a shortening of the technological transition time of the kiln from the manufacture of ceramsite of one mark to another.
Vestnik of Samara State Technical University. Technical Sciences Series. 2018;26(2):7-15
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Modeling the temperature distribution of the boiler drum wall
Danilushkin I.A., Syrov I.M.
Abstract
The development and identification problem of the temperature distribution model for the boiler drum wall is viewed.The study object is described by a homogeneous one-dimensional parabolic equation with Newton’s boundary conditions and with constant coefficients.The technique for implementing a model in a software for simulating dynamic systems is proposed.Identification of the heat transfer coefficients determining the boundary conditions from the experimental data is carried out.The analysis of the results obtained showed that the accuracy of the model, as well as the results of identification, depend on the current values of the boiler drum wall temperature.
Vestnik of Samara State Technical University. Technical Sciences Series. 2018;26(2):16-20
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Recovering the properties of thecorrelationfunction after the integral transformation
Kuznetsov V.V.
Abstract
In this paper the integral transformation of a random process is analyzed with a sufficiently General formulation of the problem. Similar problems were studied by the author earlier in relation to random functions in the electric power industry. In principle, the problem is to analyze the changes in the correlation function under the influence of the process of the integral filter with the weight function, the “inverse problem” is considered - the output signal is assumed to be known, the parameters of the input signal to be determined. The idealization used in this case consists in the assumption of the stationary of the initial process, as well as the difference structure of the weight function. The paper continues the mathematical description of the action of the linear integral operator on a random function described in the book [6], §7.
Vestnik of Samara State Technical University. Technical Sciences Series. 2018;26(2):21-25
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Efficency analysis of closed loop control systems for distributed parameter objects with interval uncertainty of the plant characteristics
Levin I.S.
Abstract
This paper devoted to a comparative analysis between two optimal distributed parameter control systems that are based on deterministic control algorithms and algorithms with the identifier of the parameters of the plant.The accuracy of the approximation of optimal processes in closed loop systems towards deterministic algorithms of optimization according to the time-optimalcriterion in the presence of complete data on the values of plant’s parameters was estimated. The structures of these closed-loop systems are determined by time-optimal algorithms of controlling of the process of induction heatingwith incomplete measurement of thestate of the plant and real-time identification of uncertain characteristics of the process which are the initial temperature and heat losses.
Vestnik of Samara State Technical University. Technical Sciences Series. 2018;26(2):26-35
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Stationary characteristics of unreliable two-channel queueing loss system with immediately replenishable time reserve
Peschansky A.I.
Abstract
The object of research is a two-channel unreliable queueing loss system. The in-coming flow of requests is considered to be simplest. The rest of random variables, de-scribing the system operation, are general ones. During request service the failure of channel can occur. In this case, the service goes on by means of random time reserve. Time reserve can be enough to complete service or to restore the channel. In the latter case, request service by the channel goes on. In case of short reserve, the request is lost. By means of the apparatus of theory of semi-Markov processes with discrete-continuous states mathematical model of the queuing system is built. Final probabilities of different physical states and average stationary sojourn times in these states are obtained.
Vestnik of Samara State Technical University. Technical Sciences Series. 2018;26(2):36-46
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Algorithmization of operational and acceptance control of technological processes of cableproduction
Chostkovskiy B.K., Mitroshin V.N.
Abstract
Acceptance control of manufactured cable products is carried out based on the results of measuring the end values of the parameters of the finished product. On the basis of violation of the tolerances stipulated in the technical documentation, cable is rejected. Increasing requirements for the quality of products necessitate the transition to continuous monitoring. The algorithm for correction of the tolerances field of controlled parameters is proposed as a function of the number of sampling points ensuring the preservation of the required output level of a suitable cable.During the transition from the acceptance inspection of long products according to the results of the violation of the tolerance limit values of the measured operating parameters to control the results of the violation of the tolerance parameters, measured across the length of the product, should increase tolerance, calculating its condition of conservation of the yield products.
Vestnik of Samara State Technical University. Technical Sciences Series. 2018;26(2):47-52
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Complex heat exchange features in once-through steam generator’s screw-shaped firebox
Shchelokov A.I., Makarov I.V., Rakhimova Y.I.
Abstract
The paper deals with features of a complex heat exchange in screwshaped coil heating surfaces of once-through steam generator. To clarify design characteristics that provide mg augmentation, investigation of factors that affect boiler's technical characteristics is carried out. It should be pointed out, that a great contribution to mg augmentation of complex heat exchange is caused by imperforated heating surface roughnesses, heating surface curvature, creating flow turbulence of the combustion gases based on aerodynamic flow orificing by impacted laps of coil. That leads to increasing of industrial safety and reduction of boiler’s gabarit and weight in comparison with triple-pass boilers.
Vestnik of Samara State Technical University. Technical Sciences Series. 2018;26(2):53-59
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Stages of realizationof the principal component method in processing of signals from analytical instruments
Saifullin R.T., Aleksandrov S.S.
Abstract
The analytical device allows to register data with a large number of detectors for a long time. The process of compression and classification of a huge array of information received is relevant. Data compression methods based on the representation of the source data through new variables of smaller dimension are used to highlight significant information. One method of data compression is principal component method (PCM). In work presented the main stages of the PCM in the processing of signals from analytical instruments.
Vestnik of Samara State Technical University. Technical Sciences Series. 2018;26(2):60-66
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Algorithms for temperature correction of physical quantities sensors
Steblev Y.I., Dusmukhambetov R.K., Popova T.Y., Lapshina A.Y.
Abstract
In this paper algorithm for temperature correction of physical quantities sensors, uses automatic correction of real static sensor transform function, is studied. For obtaining correction function polynomial approximation and spline approximation of empirical data were used. The efficiency of using linear spline was proved as well as advantages of this method against polynomial approximation and cubic spline in real-time mode were illustrated.
Vestnik of Samara State Technical University. Technical Sciences Series. 2018;26(2):67-77
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Realization of the principle of logical deployment in measurement systems
Hrisanov N.N.
Abstract
The paper considersthe principle of logical deployment in measuring systems, which involves the implementation of a search strategy in the process of the functioning of a measuring system that provides specified parameters of its functioning. The operational scheme of logical deploying is given for the case of an arbitrary number of deploying functions. A mathematical model of the system functioning is offered, an example of application of the principle of logical deployment for a multichannel analog-to-digital converter is given.
Vestnik of Samara State Technical University. Technical Sciences Series. 2018;26(2):78-83
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Methods of operational measurements of integral characteristics of periodic signals
Yaroslavkina E.E., Muratova V.V.
Abstract
The paper presents a unified concept of improving the metrological characteristics that determine the criteria for the synthesis of measuring instruments. Methods for measuring the integral characteristics are considered, using the spatial separation of the instantaneous values of harmonic signals with the formation of additional signals. The results of the analysis of the influence of the error due to the non-ideal phase-shifting blocks providing the formation of additional signals are given. The results obtained make it possible to choose the appropriate hardware depending on the requirements for the accuracy of the measurement.
Vestnik of Samara State Technical University. Technical Sciences Series. 2018;26(2):84-91
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The research of automatic control systems of natural gas air-cooling units
Abakumov A.M., Stepashkin I.P.
Abstract
The paper presents the results of a study of the developed adaptive automatic control system for the natural gas air-cooling unit. A comparative analysis of the adaptive system with a reference model of the control object and a two-loop automatic control system is shown. The analysis of the possibility of simplifying the reference model by eliminating the inertia of the electric drive and the feedback sensor is examined.The dynamic characteristics of systems with a complete and simplified model are studied. Based on the results of the computer experiment, the robust properties of the adaptive control system were evaluated with a complete and simplified model. The curves of the transient processes of the adaptive system with a complete and simplified model are calculated with the variations in the parameters of the control object. The estimation of the stock of stability of systems at the variation of parameters of object of management is given.
Vestnik of Samara State Technical University. Technical Sciences Series. 2018;26(2):92-100
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Modeling of the process of collision of the armature with the inductor in the pulsed electromagnetic source of seismic waves
Anufriev A.S., Pevchev V.P.
Abstract
In many devices when triggered arise impact a massive elements. The impact can be as one of the main stages of the process of operation, determining the transmission of mechanical energy to the load, also unwanted constraint resource settings. These required when calculation of collision force and mechanical stress is very important. The article proposed a computer model for calculating process of impact of massive elements of seismic waves source. The model is presented in the form of a diagram, including mechanical and acoustic subsystems. It allows using simple actions to group in one calculation processes in the subsystems of different physical nature. The model allows us to perform multiple test devices, which is in the process of actuation are very important stages of energy transfer by shock-interaction of the massive elements, and other devices, the characteristics of which are to some extent determined by the presence of interactions of shock type.
Vestnik of Samara State Technical University. Technical Sciences Series. 2018;26(2):101-109
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Experimental study of brushless generator with integrated exciter
Zubkov Y.V.
Abstract
When developing brushless electric generators (BEG) for autonomous power plants, it is important to ensure the quality of generated electricity and achieve improved mass and size and energy performance. These problems are solved through the use of new design and circuit solutions in the design and production of BEG. The experimental verification of realized technical ideas, confirming the adequacy of theoretical models and the conformity of BEG quality, is an actual task. Experimental studies were carried out on experimental BEG samples with integrated excitation. Energy and mass-dimensional parameters of the developed generators and their analogs are given, static and dynamic characteristics are investigated. The quality of electrical energy generated by BEG was confirmed. The time constants characterizing the speed of the voltage stabilization system along the excitation circuit are determined.
Vestnik of Samara State Technical University. Technical Sciences Series. 2018;26(2):110-117
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Synthesis of corrective device for a closed-loop speed control with digital speed regulator for the precision position-tracking servo drive
Lysov V.E., Peshev Y.I.
Abstract
Servo drives are the main ones when submitting the moving parts of the machine and realizing complex movements of the tools. The dynamics of electric drives determines the accuracy of processing or changes. To achieve high dynamic quality of control, it is necessary to provide an aperiodic transition process from one speed to another. In this case, high positioning accuracy and better cleanliness of the workpiece are ensured. The paper considers the necessary conditions for providing an aperiodic transient process in a digital control system for the rotational speed of an electric motor. The paper describes the method of additional correction of the system providing the required parameters. The theoretical positions are confirmed by the results of the simulation.
Vestnik of Samara State Technical University. Technical Sciences Series. 2018;26(2):118-127
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The analysis of output voltage quality of frequency converters with the simple laws of power transistors switching
Starikov A.V., Lisin S.L., Rokalo D.Y.
Abstract
Output phase voltage of frequency converters with p-switching of transistors and trapezoidal modulation are considered. Analytic expressions for determining of effective values of voltage for both cases are found. Formulas for calculation of the amplitudes of the fundamental and higher harmonics of the phase voltage of the considered frequency converters are obtained. It is shown that the output voltage of the inverter with p- switching of the transistors does not conform to requirements to the power quality standards. The harmonic composition of the output signal of the frequency converter, which forms a trapezoidal phase voltage, is analyzed. It is concluded that without taking into account the pulse-width modulation process, such an inverter has small amplitudes of higher harmonics and corresponds to the requirements of the State Standard. It is noted that the frequency converter that forms the trapezoidal phase voltage is characterized by the simplicity of technical implementation and small switching losses in power transistors.
Vestnik of Samara State Technical University. Technical Sciences Series. 2018;26(2):128-134
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Numerical modeling of the plane dielectric drying process in the ray type microwave chamber
Trigorly S.V., Alekseev V.S., Zakharov V.V., Kalganova S.G.
Abstract
The results of numerical modeling of the process of soft microwave drying of capillary-porous material in a ray type microwave chamber with the use of a horn antenna are presented. A mathematical model of the microwave drying process of a dielectric based on coupled equations of electrodynamics and heat and mass transfer is proposed. Mathematical modeling was carried out using the finite element method implemented in the COMSOL Multiphysics software. The model takes into account the change in dielectric permittivity and dielectric loss factor in the drying process, depending on its moisture content.
Vestnik of Samara State Technical University. Technical Sciences Series. 2018;26(2):135-143
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Long-term HPP mode optimization of the Angara-Yenisei Cascade
Trufakin S.S., Panteleev V.I., Sovban E.A., Rusina A.G.
Abstract
The structure of the Siberian power system installed capacity is characterized by a significant share of hydroelectric power plants. When planning it is necessary to take into account all technical and economic issues due to the high influence of hydroelectric power plants operation mode on the efficiency of the Siberian power system. The aim of hydroelectric power plants operation planning efficiency increasing is urgent, both in terms of ensuring Siberian power system functioning reliability and minimizing the total cost of electricity. In terms of business processes, the problem of water-energy calculations automation is of high importance. The use of optimization methods will provide problem solving more efficiently. In addition, optimization methods allow both electric and water-energy mode parameters to enter the permissible range, which is rather difficult and time-consuming due to many contradictory limitations.
Vestnik of Samara State Technical University. Technical Sciences Series. 2018;26(2):144-151
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System of electrical insulation state control in networks with voltages up to 1000 volts with dead-earthed neutral
Fominich E.N., Revyakina E.V., Kolesnik I.V., Tishkov A.A.
Abstract
Trouble-free operation of the PSS distribution networks with dead-earthed neutral up to 1000 volts largely depends on the frequency of single-phase short-circuit (SC), which are the most common type of insulation failure. Existing short-circuit protection devices in networks with earthed neutraltrigger in the event of short circuit, that is workin the event of the fault, but a rather long-term process of insulation defect development is not detected. In connection with this the assessment of the PSS distribution network isolation under operating voltage proves to be important. Development of scientific and technical solutions that enhance safety in the operation of power systems with earthed neutral is aimed at achieving the above-mentioned goals. The goal is achieved through the provision of objective monitoring of the state of electrical insulation leakage current. This allows to significantly reduce the risk of short-circuit due to early detection of developing insulation defect. The article offers the concept of system of electrical insulation with earthed neutral control and diagnostics, which allows to transfer from the fight with the consequences of insulation damage to its prevention and to a significant increase in its electro- and fire safety.
Vestnik of Samara State Technical University. Technical Sciences Series. 2018;26(2):152-161
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Electromagnetic and thermal effects induction heating
Zimin L.S., Leonenko A.S.
Abstract
Specific features of induction heating are considered, which must be taken into account when designing and operating INU. The decisive role of the configuration of the temperature field is emphasized to achieve the required heating quality. In this case, the presence of edge effects, both longitudinal and transverse, is characteristic for inductive heating. Moreover, the former are present when both cylindrical and rectangular preforms are heated. The degree of manifestation of the transverse edge effect depends on the electrical and thermal properties of the heated metal, the dimensions of the cross section, the frequency of the inductor current and the magnitude of the heat losses. Electromagnetic processes in the "inductor-metal" system of a rectangular shape are characterized by electrodynamic forces and associated vibrations and noise.
Vestnik of Samara State Technical University. Technical Sciences Series. 2018;26(2):162-165
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Control valves modelling using the MIR PIA Software
Konygin S.B.
Abstract
This paper is about the integration of the control valves in the gas and oil plant models that can be created by MiR PiA software. As example, a model of the simple part of the plant is shown. This model contains the pipeline with the control valve. A configuration of the calculation sequence is shown. A hydraulics calculation results are described for two cases. In the first case hydraulic line can work in the normal mode. In the second case the pressure drop is too big. An adoption of these models can help staff solve several problems, such as different raw material using, productivity increase, assurance of product quality problems, etc.
Vestnik of Samara State Technical University. Technical Sciences Series. 2018;26(2):166-170
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Algoritmic methods for improving accuracy of drilling instrument weight and axial load on bit
Kuznetsov V.A., Prilepin A.V.
Abstract
Algorithmic methods for improving accuracy of drilling instrument weight and axial load on bit were considered in this article. Exciting measuring methods have bigger inaccuracy because of friction forces in well and drilling line system. Inaccuracies of measurements are adjusted by additional measurements of specially formed measures as uniform as measuring quantities. The problems of adjustment of inaccuracies are solved by microprocessor.
Vestnik of Samara State Technical University. Technical Sciences Series. 2018;26(2):171-176
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