bluuebunny/crossref_metadata_2025_split huggingface dataset:
Influence of AC System Parameters on DC Current Distribution
Authors: Tong Xuefang , Pan Zhuohong 
Published: July 2019

Abstract
The ground current of HVDC transmission will cause DC bias of transformer in AC system. In order to master the influence of typical AC grid parameters on DC current distribution, a direct field-circuit coupling model of AC and DC power grid is established, and the evaluation parameters of DC current distribution are proposed. The influence of various factors such as the grid density, transformer and transmission line branch resistance, tower-ground wire system on DC current distribution in AC grid are quantitatively analyzed by grid examples. The results show that the denser the grid of a certain voltage level, and the smaller the circuit resistance of transformer and transmission line branch of a voltage level, the larger the DC current of the voltage level and the total DC current of the AC grid. When considering the tower-ground wire system, the DC current entering the AC power grid increases, and the smaller the wire DC resistance and the tower grounding resistance, the more DC current increases. In a line, the tower with the largest grounding current generally appears in the tower 1-4# near the substation with the larger current amplitude. In the calculation process of DC current distribution in large AC grid, ignoring the mutual resistance effect between substations will make the DC current of the AC grid larger, so it is not advisable to neglect the mutual resistance between substations in calculation.
Study on the Policy of Orderly Releasing Plans on Generation and Consumption of Electricity in Northeast China
Authors: Ma Xin , Liu Jicheng , Liu Qiong , Yu Linna , Ren Puchun , Yu Siyu , Chen Jing 
Published: July 2019

Abstract
An important part of China’s power system reform is the implementation of releasing plans on generation and consumption of electricity. This paper discusses the policy of orderly releasing plans on generation and consumption of electricity. By sorting out its relevant policies, interpret those policies from three perspectives. Study the releasing situation of generation and consumption of electricity in northeast China, integrate the implementation plan of the three provinces and one district and lay the foundation for studying the impact of policy and policy suggestions for orderly releasing plans on generation and consumption of electricity.
Identification method based on Zadeh filter models
Authors: Evdokimov I V , Tsarev R Yu , Yamskikh T N , Knyazkov A N , Moor I A , Kapulin D V 
Published: July 2019

Abstract
Mathematical modeling which provides the description of objects and proper organization of control operations in future is an integral stage in the automation of production. One of the approaches to build a mathematical model of an object is to represent nonlinear systems as combinations of inertial and nonlinear inertialess elements. The models thus obtained are called block-oriented. In this paper, we consider nonlinear dynamic objects represented as the models of the Zadeh filter class. In the process of the method development the identification equations were derived for the case when the test signal is a single sinusoid. Then the case of two sinusoids was considered. Such investigations allowed us to identify the patterns and describe the general case for several test components in the signal. The results of digital modeling using the sum of harmonic signals confirm the feasibility and validity of the proposed approach for identifying nonlinear models of the Zadeh filter class.
Optimization of the trajectory of movement of a parallel robot based on a modified AСO algorithm
Authors: Rybak L A , Khalapyan S Y , Malyshev D I 
Published: July 2019

Abstract
The article describes the use of a modified ACO algorithm to optimize the trajectory of a planar 3RPR robot. The trajectories of the motion of agents of the first generation were obtained in accordance with the classical and modified algorithm. The efficiency of using the modified trajectory planning algorithm was demonstrated, which made it possible to reduce the length of the original trajectories and the time required to process them. At the same time, in order to save time, the trajectories of movement obtained during its operation can be subjected to discrete local optimization. The result of the work of the algorithms is a set of tasks reflecting the change in each of the input coordinates of the mechanism over time, which can be directly used during the operation of the robot control system. A detailed description of the algorithm and the results of mathematical modeling are presented.
Technical state evaluation of oil-lubricated parts and units of aircraft gas turbine engines using microwave plasma method
Authors: Drokov V G , Drokov V V , Ivanov N A , Myrishenko V V , Skudaev Y D , Hodunaev A Y 
Published: July 2019

Abstract
The method for technical state evaluation of oil-lubricated units of aircraft gas turbine engines using measurement of wear particle parameters and the microwave plasma method is suggested. Diagnostic features accounting for quantity and composition of wear particles in oil samples and oil filter wash samples have been discovered. Parameter levels for non-defective engines are evaluated. Reference statistical models for non-defective engines, which take into account engine type and engine operating time, are calculated. Distribution laws of parameter values are evaluated, and value normalization functions were found. Actual validity with accuracy up to a unit has been estimated to be 85%, which is confirmed by factory disassembly study of engines, removed from operation by the results of evaluation.
Geomechanical feasibility of underground coal mining technology using control systems of electro-hydraulic shield supports for longwall mining
Authors: Klimov V V 
Published: July 2019

Abstract
The main objective of the research is to assess the possibility of using control systems of electro-hydraulic shield supports for researching geomechanical processes in the rock massif. The research aims to increase the efficiency of longwall mining technology. As a result of the research, changes of pressure distribution in the hydraulic powered shield supports along the width and length of the longwall panel are established. Pressure changes at various speeds of a longwall advance have been established. Recommendations about an increase in efficiency of underground mining of coal seams are made. The paper novelty consists in establishment of dependences of the maximum loads upon a shield on the speed of the longwall advance.
Development of technology for recovery of thermal energy of gases
Authors: Kondrat’ev V V , Sysoev I A , Sysoeva T I , Ershov V A , Gorovoy V O , Ivanov N N 
Published: July 2019

Abstract
The project aims to develop an energy saving method for conversion of thermal to electric energy. The review of engineering solutions in this area demonstrated the rationale for using thermoelectric generator (TEG) modules to produce energy for business use. As a part of the research, ANSYS models were developed and thermal fields of flue walls were studied at different flow speed rates and gas air environment temperatures. A design of the TEG unit consisting of 12 TEG modules, a cooling radiator and a switching unit was developed. A bench for studying the efficiency of converting thermal to electric energy was designed. Experiments using three types of TEG modules were carried out. Capacity values at different temperature gradients were determined. Pilot testing of a high performance thermo-electric generator was carried out within the temperature range under study. It was identified that by increasing the number of TEG units, it is possible to meet technological needs. A system consisting of single inline TEG units was developed. It was used for making circular cross sections in flues. The number of TEG units, the type of modules and the method for their connecting depend on capacity rates, temperature and flue dimensions. The authors filed a patent application. The possibility of research results commercialization in the oil and gas, metallurgy and chemical industries is being explored.
Air magnetic separator for the preparation of forestry seed material and its theoretical justification
Authors: Kozlova E V , Skrypnikov A V , Kozlov V G 
Published: July 2019

Abstract
The preparation of high quality seed material requires cleaning on special seed graders. Seeds of different cultures have particular surface and shape. Taking into account these differences, various plants have been developed and are widely used. The need for magnetic cleaning is caused by the impossibility of high-quality separation of seeds of different forestry crops. The analysis of modern technical means for the preparation of seed material showed that the idea of combining air and magnetic cleaning deserves special attention. In air magnetic separation, various forces influence a seed particle, the magnitudes and direction of which vary depending on the design parameters of the inductor and the position of a particle in the magnetic field of an inductor. It is possible to investigate the movement of a particle in the working channel, as well as to create a mathematical model by accepting some assumptions, the result of which will determine the main regularities of the air magnetic separation process and theoretically study the influence of the structural and technological parameters of the air separator on separation process. The particle motion curves were constructed for various values of magnetic force in the working channel according to the results of the analysis of seed motion trajectories. During the course of the research the graph illustrating the possibility of performing the process of air magnetic separation depending on the ratio of the air flow rate and magnetic force influencing a particle is presented.
Auxiliary equipment for downhole fittings of injection wells and water supply lines used to improve their performance in winter
Authors: Kuleshova L S , Kadyrov R R , Mukhametshin V V , Akhmetov R T 
Published: July 2019

Abstract
The article deals with two methods for eliminating freezing of injection wellhead fittings. The first method involves removing injected water from the well fitting under long well operation stoppage at negative ambient temperatures. Water is removed and air is supplied through the system of valves (a spring loaded valve and a float valve). When pumping water into the injection well, the float valve closes the access to the environment, and the spring-loaded valve is open for injected water. When the injection process stops, the spring-loaded valve supplies remaining water into the well fittings and the surface part of the water supply line and closes; the float valve opens. Air into the free space of the well fittings is supplied through the float valve thereby preventing the wellhead and the surface part of the water supply line from freezing. The second method is used to prevent the mouth of the injection well from freezing. A device is installed inside the casing, which allows heat to be accumulated in summer and winter. Accumulated heat is used to heat up the mouth when the water injection process stops.
Frequency converter power reduction for controlling the hydraulic parameters of the pumping station
Authors: Mukhamadeev E Z , Yagafarova Kh N 
Published: July 2019

Abstract
The article discusses the issue of power reduction for oil and gas equipment. It studies the method for reducing power of a frequency converter to control the hydraulic parameters of a pipeline by replacing a single centrifugal pumping unit with a pumping station consisted of series-installed pumps. The frequency converter is installed on the first stage pump. The method was tested in the water supply system for irrigation of high-temperature aerosol of technical carbon.
Evaluation of the effect of asphalt resin paraffin deposits on oil well performance
Authors: Petrova L V , Yarullin D R 
Published: July 2019

AbstractThe article deals with the problems of field development. The causes of low well performance were identified. Examples and causes of paraffin deposit formation were given. Methods aimed at solving problems of well operation were developed. An innovative method for dealing with asphalt-resin-paraffin deposits was suggested. It involves application of a submersible container with a complex action inhibitor. The formula of the inhibitor is presented. The technological layout of the container with the inhibitor is presented. Technological efficiency of the inhibitor as a method for ASPD prevention was proved.
Optimal design based on probability approach and fracture mechanics
Authors: Pitukhin A V , Skobtsov I G 
Published: July 2019

Abstract
This paper deals with the statistical fracture mechanical method for the optimal design of forest machine components. The problem of optimal design includes the choice of the objective function and independent design variables and establishment of the system limits. The objective function is determined as the mean total cost that includes the initial cost and the cost of failure according to the failure probability. A quasi-brittle fracture occurs under the influence of the stationary random process of loading. Analytical equations of reliability function estimation are obtained. The algorithm of the random search method includes an interval reduction with regard to zone and functional constraints. The approach to the optimal design problem solution can be applied to obtain optimal geometrical sizes and permissible limit defect values of machine components.
Electrothermal processing of tantalum capacitor powders
Authors: Cherednichenko A V , Cherednichenko V S , Bikeev R A , Serikov V A 
Published: July 2019

Abstract
A low-pressure arc discharger with the hollow cathode is a newly developed electrotechnological device for finely dispersed powders of particles having dimensions 50 micron and less. The discharger is useful for putting powder into a high reactive zone of a plasma column and for thermal and mechanical action on particles. In the NSTU, the plain scales of the splinter tantalum powder were gained experimentally. Based on the results of the experiments, several constructive solutions are proposed for the heating of powders with subsequent deformation of tantalum powder particles on the target.
Microprocessor-based watching control system for improved ladder-type rectifier
Authors: Ivanov V V , Myatezh S V , Kapustin A V , Alekseeva I K 
Published: July 2019

Abstract
Currently, the most energy-efficient device designed to convert AC to DC is a zone converter built on the basis of controlled power semiconductor devices: thyristors and transistors. The basis of these converters work is the zone-phase regulation method. The paper discusses the construction of a microprocessor control system for improved four-zone rectifier. The tasks aimed at energy efficiency achievement have been set and solved, the relevance of the tasks is justified. The microprocessor control system development stages including the drivers creation with galvanic isolation for thyristors and transistors control and greed synchronization are shown. Justification and choice of feedback are produced. The control algorithm for power semiconductor devices incorporated in the control program is given. For better understanding of the system operation principle, a block diagram which is based on a program written for the microcontroller is given. That program reflects the control system algorithm. Software modeling of the proposed system is carried out, the modeling results are presented.
Preliminary results of TUSUR University project for design of spacecraft power distribution network: EMC simulation
Authors: Kuksenko S P 
Published: July 2019

Abstract
In this paper, the relevance of the use of mathematical modeling with the electromagnetic compatibility requirements in solving problems of space engineering is shown. Approbation of the software prototype developed in TUSUR is performed by designing the power supply network elements of a spacecraft. The mathematical and software features of the prototype are described.
Definition of distortion power in AC network and analysis of its reasons
Authors: Myatezh S V , Novolodskiy M V , Kitova E T 
Published: July 2019

Abstract
This paper studies the conditions under which such non-active power components as reactive power and distortion power appear in the alternating current power network. By simulating with MatLab Simulink, the validity of formulas obtained by analytical way was tested. The formulas define the components of non-active power based on one of the most well-known theories. The results obtained will be useful for mode optimization in the alternating current networks and for developing effective non-active power compensating technologies.
Grinding closed circuit in centrifugal grinding unit
Authors: Sevostyanov V S , Uralskij V I , Uralskij A V , Sinitsa E V , Uralskaja L S 
Published: July 2019

Abstract
The article presents scientific and technical developments on the creation of a technological module of a closed grinding circuit, the design of which allows improving the quality of the finished product, as well as improving the performance of the grinding unit. The process of organizing a closed cycle using a centrifugal air-through separator with two separation zones is described. The influence of the design parameters of the input and output elements of the pipes on the gas flow rate in the working chambers of the grinding unit using the SolidWorks software in the FlowSimulation module has been studied.
Features of thermal ageing of cables with different type of insulation
Authors: Vlasov A B , Vlasova S V 
Published: July 2019

Abstract
A wide range of temperature and duration of cable routes operation requires the development of objective methods for assessing the properties of cable insulation. While working, preparing and repairing cable routes, it is important to use express methods to determine the technical condition of insulation, to search for diagnostic parameters indicating the process of crack formation. An ongoing monitoring of cable insulation with standard devices controlling electrical resistance and leakage currents is not sufficiently effective for evaluating the performance and predicting the properties of cable insulation. The study is aimed at further testing of the technique by analysing the properties of materials used in cable engineering, as well as comparing the results obtained by various devices manufactured by national and foreign companies. Tests were carried out to assess the quality of insulation based on the monitoring of hardness of the hose insulation and the conductor insulation of KNR and KNREk cables. In the KNREk type cables, the core insulation is also made of the RTI type rubber, but the hose insulation is created on the basis of a material from polyvinyl chloride compound. The method of assessing the quality of insulation and assessing the degree of ageing of cable material is implemented by measuring the hardness of insulation material using the Shore method using portable hardness testers of the following types: TH-200, NOVOTEST TS D-A (TS D-D) up to 100 HSА (HSD). It is shown that the proposed technique makes it possible to identify objective statistical parameters of the material hardness and to diagnose the quality of insulation in operation without dismantling cable routes. The hardness parameters of hose insulation from polyvinyl chloride compound can be controlled by TS D-D devices. The heat resistance of hose insulation of the KNREk type cables is higher than that of the cables of the KNR type, which creates opportunities for their longer operation at high temperatures.
Theory and a posteriori practical methods for calculating the reliability of electrical equipment
Authors: Kuznetsov S M , Orlova I V , Lisichko O I 
Published: July 2019

Abstract
The determination of the current technical resource of the electric transport system is an important characteristic that allows one to define not only the current reliability of the system, but also to predict it for the future. If the maintenance of electrical equipment is carried out to restore the reliability, failure flow is not stopped, then the intensity of equipment failure will be artificially overstated. The timing of service impacts will also be overstated unsuccessfully.
Problems of mathematical modelling of elastic boundary value in the stress-strain state of car body elements
Authors: Gulyaev V A , Kozlov A A , Loginov N Y , Soldatov A A 
Published: July 2019

Abstract
This article considers mathematical modeling problems of elastic boundary value. The stress-strain state mathematical modeling is used to assess the adequacy of theoretical solutions. The conditions of stress-strain state elements of the study mathematical modeling of the car body are given. The obtained analytical dependences make it possible to simulate the stress-strain state of the car body elements in real operating conditions and to compare the experimental and calculated values of stresses, strains and displacements arising under load.
Evaluation of the economic feasibility of the introduction of plasma hardening technologies in the Far North enterprises
Authors: Konyuhov V Yu , Gladkih A M , Chemezov A V 
Published: July 2019

Abstract
The various technologies of plasma surface hardening of the crests of wheel pairs with regard to the conditions of the Far North are considered by the example of Norilsk enterprises. When considering economic issues the cost of repairing wheelsets were considered. The advantages and disadvantages of each method of plasma surface hardening are shown. Criteria for the economic feasibility of their implementation are established. It is shown that from the standpoint of hardening process cost of one wheel, it is preferable to use the plasma quenching technology in the arc mode.
Influence of Fe component from milling yield on characteristics of perlite based geopolymers
Authors: Kozhukhova N I , Zhernovsky I V , Lebedev M S , Sobolev K 
Published: July 2019

Abstract
The mineral and chemical composition of aluminosilicates used in geopolymer systems is critical for optimal structure formation and the overall performance of the geopolymer products. The composition of alumosilicates can be altered during the technological processing, especially, at the stage of fine milling. This study investigated the effect of aluminosilicate contamination with Fe from milling yield, the characteristics of the aluminosilicates with a metal lining, structure formation, and hardened properties of geopolymers based on different natural and technogenic persilicic aluminosilicates. The formation of Fe-phases due to milling yield was detected by the XRF analysis and the XRD investigation revealed the formation of nanosized ferrous hydroxide or bernalite Fe(OH)3(H2O)0.25. The volume of an elemental cell of the nanosized bernalite per Fe atom is 4.5 times larger than that of the metallic iron. This results in the disintegration of the matrix, which was observed by SEM and then confirmed by reduced strength performance of geopolymer composites. Based on this study, the negative effect of Fe-phases from milling and nanosized ferrous hydroxide on structural characteristics and service performance of geopolymer composites based on natural and technogenic raw materials was concluded.