bluuebunny/crossref_metadata_2025_split huggingface dataset:
The assessment of technical and economic indicators of gas cleaning systems working on various types of coal
Authors: Batrakov P A , Yakovleva E V , Mrakin A N , Selivanov A A , Mingaleeva G R , Afanaseva O V 
Published: January 2020

Abstract
The object of the study is a set of activities to reduce the concentration of sulfur and nitrogen oxides in the combustion products of boiler units, by equipping them with a gas purification system. Improving the environmental parameters of the power facility is achieved through the installation of devices for cleaning combustion products: an absorber for cleaning sulfur oxides and a neutralizer for cleaning combustion products from nitrogen oxides. In this work the definition of technical and economic indicators is carried out and a comparative analysis of various types of fuels in order to increase the economic and environmental parameters of the installation are presented. The technical and economic indicators for each type of the fuel are determined.
Information and analytical platform for evaluating the effectiveness and choosing directions for improving the energy and water supply systems of oil and gas chemical complexes
Authors: Dolotovsky I V , Semenov B A 
Published: January 2020

Abstract
The paper presents the structure and content of a specialized enterprise information system that can be used to calculate the parameters of energy generation process and complex structure and to study and develop specific equipment for individual plants and create autonomous energy and water supply systems for oil and gas chemical complexes. The paper proposes a three-dimensional hierarchical model with orthogonal connections that includes the object of study, the problems of increasing energy performance of such object and potential methods of solving these problems. The paper presents calculation algorithms and the results of numerical modeling of energy supply systems operating within the conditions of dynamically developing oil and gas chemical complexes. Schematic solutions of the developed optimal resource-efficient energy supply systems for various technological processes are also provided. The paper discusses the potential beneficial modifications of energy supply system structure of raw hydrocarbon processing facilities; these modifications are based on the principles of polygeneration and further integration between energy supply system and processing units.
Power plant on the basis of internal combustion engine with gas dropping in the technological furnace of oil refining plant
Authors: Mrakin A N , Vdovenko I A , Afanaseva O V , Ageev M A , Selivanov A A , Batrakov P A 
Published: January 2020

Abstract
The main results of the evaluation of the technical and economic indicators of power plants based on internal combustion engines (ICE) that are integrated into the refinery process cycle are considered. The statistical processing of commercial offers has been carried out, which allow to evaluate capital investments in the main power equipment. The results of the calculation for the operating conditions of the power plant on its own gas of refining showed a good investment attractiveness of the project. The calculations found that the influencing factors can be ranked in descending order of importance: the cost of electricity, the rate of discount, capital investments in the object, the fee for the power supported for the reserve from the power system. Since the generator voltage of the internal combustion engine is 0.4 kV, the economic efficiency of the proposed power plant will be higher than the considered base case and it is advisable to produce electricity supply in the factory network on the low voltage side.
Evaluation of the accounting the AVR of the generator in the power system model in the study of the subsynchronous resonance
Authors: Rysev D V , Rysev P V , Shulga K S , Meshalkin O V 
Published: January 2020

Abstract
The article discusses the model of the power system taking into account the automatic voltage regulator of the generator at the occurrence of a self-clearing fault on the line. In this case, the grid contains series compensation. The generator is an electromechanical system consisting of a turbine and a synchronous generator with an excitation system. Time plots of rotation angles deviations of rotating parts of turbine, twisting torques, and also plots of maximum deviations of rotation angles and twisting torques from the level of series compensation are shown with the indication of the area in which they grow in time.
Calculation studies of the ambient temperature variation influence on the gas tube boiler efficiency
Authors: Slobodina E N , Kikhtenko V A , Mikhailov A G , Gaak V K , Stepashkin I A 
Published: January 2020

Abstract
The ambient air temperature variation influence on the efficiency of the gas tube hot water boiler operating in the heat supply system is considered in the paper. The dependency graphs of the fuel consumption, temperature in the near-wall layer of the convective bundle on the gas side, and aerodynamic losses along the length of the fire tubes in the convection bundle on the ambient temperature were drawn. The basic calculation formulas used for the calculation, as well as the temperature chart of the heat supply system operation depending on the ambient temperature are presented.
The method of the research of residual gases in a tight case of quartz resonators
Authors: Belousov K A , Strunin V I , Khudaibergenov G Zh 
Published: January 2020

Abstract
Mass spectrometric analysis of closed-volume gases of quartz resonators-thermostats emitted by the materials used in the installation of the device. A measuring complex with a vacuum of 10−5÷10−6Pa has been developed. The mass spectra of the residual gases were obtained before the depressurization of the products in the DIL-14 housing. The temperature range of the study is 20÷160 °C.
Improved algorithms for determining the strain of optical fibers using Brillouin reflectometers
Authors: Bogachkov I V 
Published: January 2020

Abstract
The issues of improved algorithms for determining the strain of optical fibers using Brillouin reflectometers are investigated. Structure charts of devices for early diagnostics of optical fibers are presented. Adaptive algorithms for construction of Brillouin reflectograms: patterns of Brillouin frequency shift and strain distribution along the optical waveguide are considered. Reference Brillouin reflectograms for different optical fibers from the database are required to correctly detect the “problem” segments (segments of optical fibers with increased mechanical strain or with transformed temperature) in the optical waveguide.
Calculation of speech intelligibility considering primary transducers’ parameters
Authors: Ivanov A V , Kofanov D S 
Published: January 2020

Abstract
The main characteristics of primary transducers are considered. The experiment is carried out to estimate the level of self-noise in microphones and accelerometers. The measurements are taken in identical conditions for all the primary transducers. The statistics on acoustic and vibroacoustic noises in premises is gathered. Based on the findings, the algorithm to calculate speech intelligibility considering the primary transducers’ parameters is developed.
Developing an algorithm for creating the optimal spectrum of a masking noise considering a speaker’s diction
Authors: Ivanov A V , Shemshetdinova E E 
Published: January 2020

Abstract
The experimental research is carried out to build up a database with speaker’s voices. The structure of the database with speaker’s voice signals is designed. The software to calculate the optimal envelope shape of interference based on the speech samples is developed. The obtained interference is suitable to disguise voice signals of certain speakers in protected premises during the confidential conversation. Development prospects are described, and recommendation for further research is given.
Dependence of Error Probability on the telegraph Distortion Value
Authors: Kosykh A V , Kryzhanovsky D A , Khazan V L 
Published: January 2020

Abstract
The transmission of messages via non-stationary communication channels is made in conditions of adapting the receiving and transmitting equipment to the communication conditions. Mode of adaptation to communication conditions requires rapid assessment of the communication channel quality. The most obvious criterion for assessing the quality of a non-stationary communication channel is the constantly changing value of the elements error probability in the transmitted message. However, assessing the error probability of message elements requires significant time intervals, which may exceed the time of stationary state of the communication channel. It is known that the error probability of message elements is uniquely related to the value of telegraph distortions. The estimation of the telegraph distortion value requires much less time compared to the time required to estimate the probability of errors. In this case, the indirect estimation of the error probability by the value of the telegraph distortion can be made relatively quickly at an interval that is many times less than the stationary state interval of the communication channel. In this regard, the possibility of indirect estimation of error probability in terms of telegraph distortion is relevant for receiving and transmitting equipment with adaptation to communication conditions.
The characteristics of the band-pass filter from the various parameters of the substrate
Authors: Quan D M , Hung L Q 
Published: January 2020

Abstract
In this work, the design of a band-pass filter implemented on L-resonators is investigated. On one side of the substrate there are transmission lines responsible for the input and output of the structure. On the second side of the substrate are the resonators themselves. Studies have shown that to obtain a higher frequency band, a substrate with a high dielectric constant value is required. The thickness of the substrate affects the size of the filters. This filter is technologically easy to implement using standard methods of manufacturing printed circuit boards.
The monitoring channel of the random process parameters with the simplified structure in discontinuous conditions variation
Authors: Danilov S N , Naimov U R , Belyaev M P , Pudovkin A P , Varepo L G , Panasyuk Yu N , Belyaev P S 
Published: January 2020

Abstract
The modern requests of movement trajectory monitoring of any devices like a car or an aircraft as well as e.g. power facility parameters make one solve the task of measuring devices development which can stable operate at the extremal unexpected both coordinates variation and their derivatives. Such task can be solved by monitoring measuring devices synthesis with changeable characteristics and structures depended on the situation mainly based on variable combination of the state models. Both the functioning and simplified algorithm of the measuring system based on the synthesis technique was developed. The algorithm system consists of two simple linear filters, residual comparing scheme and estimate choice one. The both algorithms formed by the system theory technique and simplified with selection mode give the concurrent assessments.
Evaluation of Probability Errors in Condition Monitoring of Heat-Exchange Equipment
Authors: Demin A M , Naumenko A P , Gorchakova A A , Odinets A I 
Published: January 2020

Abstract
This paper focuses on problems of selecting and defining boundary values for criteria in condition assessment of diesel hydrotreating process units’ heat-exchange equipment. The objective of this paper is to define critical parameters of heat exchangers operation. Substantiation of the selected condition assessment criterion is presented. The value of the proposed criterion was calculated using statistical data relevant to the condition assessment of heat-exchange equipment and probabilistic-statistical methods of decision making.
The control system simulation technology for optimization and determination of the feasible parameters domain
Authors: Denisova L A , Meshcheryakov V A , Karabtsov R D 
Published: January 2020

Abstract
This paper focuses on the simulation technology for optimization of the automatic control system (ACS) parameters vector to be tuned and to provide a stable operating mode eliminating self-oscillations. A hybrid approach (synthesis of optimal control methods and simulation research) for designing ACS using genetic algorithms is presented, which allows taking into account constraints when searching for the optimal solution. Simulation of the ACS was performed using the software tools MATLAB / Simulink / Global Optimization Toolbox. It is shown that the proposed technology for determining the domain of recommended tuning parameters is effective for computer-aided design of ACS, it allows to significantly improve the quality of control and reduce the time spent on pre-setting developed controllers.
Computer model of a gas path in a microturbine unit
Authors: Korotkiy V A , Khmarova L I 
Published: January 2020

Abstract
Microturbine units are used for autonomous supply of buildings and engineering facilities with heat and electric energy. Gas path of a microturbine unit contains a combustion chamber and a set of gas-burners which provide mixing of the natural gas with the air, followed by total combustion of the obtained gas-air mixture. The known structures have two essential disadvantages which reduce operational efficiency of a gas turbine as part of the microturbine unit. The first disadvantage is caused by inhomogeneous nature of the “gas-air” flammable mixture, which leads to an incomplete combustion of fuel and emission of nitrogen oxides harmful for the environment. The second disadvantage is connected with a loss of mechanical strength of structural elements exposed to the impact of high-temperature products of combustion. The article proposes methods of boosting the resource of a combustion chamber by enhancing its mechanical durability with a simultaneous reduction of the content of nitrogen oxides in flue gases. The first method is in the use of power elements installed inside the combustion chamber. The second method of boosting the resource of the combustion chamber is connected with accurate profiling of windows through which cylindrical gas-burners get inserted. The third method is based on improving the quality of mixture formation in the casing of the gas-burner. Combined application of the proposed modification activities allows reducing the extent of harmful emissions as well as boosting the resource of the microturbine unit.
Modeling of shaping process and analysis of gear wheel cutting process by means of AUTOCAD and ANSYS software
Authors: Lyashkov A A , Murashev G E 
Published: January 2020

Abstract
In the present paper methodology of computer aided geometric modeling of formation of workpieces with periodic teeth machined with centroid enveloping method is developed without involving complex mathematical apparatus. During its application, as opposed to already known methods, simultaneous modeling of two objects of formation – wraparound and removed contents – takes place. Analysis of configurations of solid models of cutaway layers and respective removed content volumes allows a design engineer to intentionally set the optimal values of tool advance parameter and number of passes. The key point of the present paper is to establish logical connection between geometric computer simulation of removed contents in CAD environment and analysis of chip formation in the process of cutting using ANSYS software. In the present paper AutoCAD 3D simulations rendering of cutaway layers is shown along with the corresponding realistic simulation of chips, created using metal cutting process finite element analysis software. Due to substantial difficulties of cutting process 3D simulation, it is considered reasonable to perform computer simulation of cutaway layers geometry generation on the first stage of problem solving. This will allow us to choose the optimal cutting parameters and consequently speed up the cutting process simulation.
Analysis and trimming operations in the problem of spatial formation of a family of offset curves given an area with islands
Authors: Myasoedova T M , Panchuk K L 
Published: January 2020

Abstract
In the present paper an algorithm of determination and trimming of non-working segments of offset curves generated for an area and a number of islands within it is considered. The algorithm is based on cyclographic method of spatial formation of offset curves given curvilinear boundary contours of an area and islands within it. Methods of analysis and corresponding algorithms of trimming of non-working segments of offset curves are considered for the cases of self-intersection of offset curves. The analysis and trimming operations form the basis of the proposed algorithm of spatial formation of offset curves. The calculations that accompany every stage of formation process are exact and not based on iteration algorithms. The acquired analytical solution to the problem of generation of a family of offset curves significantly facilitates cutting tool trajectory calculation and control programming in pocket machining on NC units.
Algorithmic presentation of light-sensitive layers printing monitoring in-process
Authors: Nagornova I V , Bablyuk E B , Varepo L G , Trapeznikova O V , Lazareva O V 
Published: January 2020

Abstract
In the study the in-process monitoring algorithm for the flexible printed LED-pixels production at the light-sensitive layers formationstage is presented. The light-sensitive layers are based on either polymethine dyes complexes or luminophores. The both chemical and electrostatic interaction between the light-sensitive compounds and the bottom functional layer affected on crystallization conditions as well as the previous layer relief and thermal postprocessing parameters including next layers formationare most significant production factors. The production layers defects are determined. The optimal stages of optical properties monitoring are defined. The in-process optical properties monitoring technique is offered.
Cyclographic images of Bezier Splines
Authors: Panchuk K L , Lyubchinov E V 
Published: January 2020

Abstract
In the present paper the analysis of impact of smoothness of connection of spatial curve segments on smoothness of connection of its cyclographic images constituting a cyclographic projection of the curve is presented. The spatial curve is represented by a Bezier spline consisting of Bezier segments of constant order connected with a certain order of smoothness. Formation of Bezier splines consisting of segments of equal order (from two to five) and formation of respective cyclographic projections is considered. Reduction of order of smoothness of connection of segments of cyclographic projection with respect to the order of smoothness of connection of corresponding segments of the Bezier spline is discovered. Numerical experiments were conducted, their results confirm the theoretical conclusion. Recommendations on Bezier spline selection in practical tasks based on connection of segments of cyclographic projection of spline with certain order of smoothness are given.
Video quality control by determining the frame average color
Authors: Proskuriakov N E , Yakovlev B S 
Published: January 2020

Abstract
In modern conditions, despite variety of hardware-software complexes for creation and promotion of multimedia projects, still big problem is the optimum choice of codecs and settings of quality of operations of rendering depending on tasks of developers or a site on which there will be further a material. In most cases now «optimum parameters» of video rendering are understood as creative activity of the person which on the basis of visual survey, specific and subjective ideas of quality of «picture» of a product, has to receive balance between «quality» of the picture and final file size. In fact, now practically there are no tools in order that it is simple to compare two identical videos on quality and to make quantitative quality evaluation of the video file. Therefore, this direction of researches is important and actual. The main objective of work - to define possibility of use of average color of frame and a color difference for quality evaluation of the video files received at different settings of rendering. Results of pilot studies of determination of average color and a color difference for frame of the video file are provided. Experimental and analytical means revealed possibilities of application of this method for quality determination the video file and findings of differences from the original. As showed research, the most high-quality codecs are H265, DivX and MPEG2. In addition, it was set that DivX showed the greatest stability on a color difference. The offered method can be applicable for a provisional estimate of quality of the received movies since average color does not consider the accuracy of some, important parameters, for example, text clearness on frame. It well copes with the general determination of video frame quality.
Dynamics and Control of a Two-Spacecraft Coulomb Formation: Challenges and Prospects
Authors: Aslanov V S 
Published: January 2020

Abstract
The paper is devoted to the issue of active large space debris removal. The contactless method of influencing space debris through the electrostatic interaction is considered. The main advantages of this method are possibility of space debris removal in geosynchronous orbit with low energy costs and absence of a dangerous and complex stage of space debris capturing or docking. This paper introduces the trends and features of a relative attitude dynamics and control of the two-spacecraft coulomb formation. The advantages of the multi-sphere method are discussed for modeling and analyzing the attitude motion of space debris. Two towing schemes (push or pull) are studied in detail. It is shown that the pushing scheme has distinct advantages. The features of the attitude motion of the towed object are identified including chaotic phenomenas and control laws of attitude motion are presented. In the final, the possibilities removal of non-functioning GEO satellites of complicated configuration using electrostatic tug are discussed.
Dynamic model of the mechanical drive with automatic continuously variable transmission on the basis of Appell’s equations
Authors: Balakin P D , Dyundik O S , Zgonnik I P 
Published: January 2020

Abstract
The design approach is based on to mechanical systems is implemented by adaptive properties to the actual parameters and to the operating conditions in the synthesis of the mechanical drive on design stage allows to implement many technical solutions of mechanical transmission with qualitatively new properties. Using for the adaptation additional motion of the links to the main one, it is possible and important to get auto-CVT with the transfer function dependent on the level of the transmitted power flow. The design of the auto-CVT which is potentially capable to provide full use of the available power in the mechanical drive, stationary and energetically perfect mode of operation of the engine at variable type of external loading is considered. Mathematical model of mechanical auto-CVT obtained by using Gibbs function – the acceleration energy. The results of the research are on the basis of which it is possible to perform design calculations of the links and connections of the auto-CVT, including its automatic control chain.