bluuebunny/crossref_metadata_2025 huggingface dataset:
Two-stage Coordinated and Dynamic Economic Dispatch of Multi-microgrid System Considering Hierarchical Structure
Authors: Kong A L , Zhu X , Liu H X , Zhou C , Chen L J
Published: July 2019

Multi-microgrid (MMG) system consists of several microgrids (MGs) close to each other in space, and is more resilient to uncertainties and economical in operation than single MG. To coordinate the different goals of MMG system and individual MGs, a hierarchical dispatch structure is firstly established in this paper. Based on this, a two-stage dynamic economic dispatch (DED) scheme is then proposed to achieve the compromise between global and local scope. In Stage I, MMG system’s operation cost is minimized to determine the power exchange among MGs, while in Stage II, each MG’s purchased power from main grid is optimized to realize local economy. Finally, numerical tests are performed on a triple-MG system and different cases are studied to demonstrate the effectiveness and feasibility of the proposed dispatch strategy.
Study on Parameter Calculation of 1000MW Hydro-generator based on Field-circuit Coupled Finite Element Method
Authors: Zhang Yanyan , Wang Aihua , Gao Nannan , Li Hongbo , Huang Jinxin , Si Tailong , Wang Lei
Published: July 2019

This paper mainly presents a field-circuit coupled finite element model (FEM) of a large hydro-generator for the study of generator parameters. In the model, the two-dimensional (2D) moving electromagnetic field finite element model is coupled with the external circuit model, and some influencing factors are taken into account, such as saturation of iron-core, rotation of rotor, distribution of stator windings and end rings of damper bars, as well as end-impedance of stator and rotor windings. Based on this model, the parameters of the 1000MW hydro-generator are calculated, and the steady-state, transient, and sub-transient reactances are obtained. Furthermore, the calculation results are compared with the designed values, and some meaningful conclusions are reached. Finally, the influences of different loads and power factors on saturated synchronous reactance are discussed.
Research on Filtering Method of Increment Capacity Analysis Curve of Ternary Lithium Ion Battery
Authors: Qi Zhang , Jian Wu , Zhanguo Wang , Yanru Zhang , Biqiang Mu
Published: July 2019

Increment Capacity Analysis method has been widely concerned by experts and scholars because it can analyze the battery chemical reaction without destroying the physical structure of the battery. However the inevitable noise on the capacity increment curve brings huge damage to the analysis of the battery reaction process. In this paper, the influence of different voltage intervals on the ICA curve is analyzed firstly, then a certain voltage interval is selected, and the capacity increment curve is filtered by Gaussian process regression and wavelet transform. Compared with the original unfiltered ICA curve, the proposed method is verified feasible.
A Prototype of Solar-Powered Automatic Ablution Tap
Authors: Adriansyah Hulukati Stephan , Pratiwi Handayani Tri , Jaya Risman , Abdussamad Syahrir
Published: July 2019

Muslims are required to perform ablution before praying. This activity uses water, and can consume a huge amount of it when there are a lot of people who perform ablution at the same time. Conventional ablution taps are unable to control the usage of water. Usually, the tap is left running during this action. Therefore, a lot of fresh water unnecessarily flows to the drain. In order to reduce the usage of ablution water, this research developed a prototype of solar-powered, automatic water ablution tap. The system uses ultrasonic sensors to detect human presence and employs an Arduino microcontroller. It sends the “on” and “off” instructions to the relay to activate the solenoid valve to allow water flow. Water flow from the ablution tap can be more efficient with this system. The sensor detects the presence of human and works only when needed. So, the user does not need to touch the valve to activate water flow. This automatic control system can reduce the excessive water consumption when performing ablution. The testing of the system was conducted in a mosque in Indonesia. The experiment shows that the system is effective for detecting the presence of human in the range of maximum 50 cm above the tap. The used of ablution water is reduced significantly approximately 1900 cc compared to manual tap.
Development of a Neural Network Model for SoH of LiFePO4 Batteries under different Aging Conditions
Authors: Kuo T J , Lee K Y , Chiang M H
Published: July 2019

LiFePO4 batteries have a variety of superior properties, such as higher power densities, higher capacities, longer lifetimes and better safety. For these reasons, LiFePO4 batteries are used extensively in electric vehicles and energy storage devices. However, there is an issue with the battery capacity in that it begins to rapidly fade after a certain number of charge and discharge cycles under compound influence of temperature and discharging current, which may lead to safety concerns. Therefore, it is very important to investigate the characteristics (voltage, current and capacity) of LiFePO4 batteries in relationship to the number of cycles and environmental temperature. In this paper, for the sake of high efficiency and safe operation of LiFePO4 batteries, we propose a Back Propagation neural network (BPNN) model which estimates the state of health (SoH) of the battery, so that the accumulated error of the capacities under different operating environments can be corrected. The accuracy of the model was verified in an electric vehicle with an average error of only 1.56%. The results show that the proposed model is satisfactory.
The Configuration Effect of SCSR on VFTO and Its Inhibitory Effect Analysis
Authors: Han Mingming , Chen Bo , Zhu Wenbing , Gu Chao , Feng Yi
Published: July 2019

The very fast transient overvoltage (VFTO) is changed when stepped controllable shunt reactor (SCSR) is installed in substation, this paper simulates and analyzes the closing sequence of the disconnector (DS) and voltage transformer (PT) installation location’s influence on VFTO with Dommel transmission line, and establishes the VFTO suppression equivalent impedance model in frequency domain, and analyzes the effect of various measures to suppress VFTO time-frequency amplitude. The results show that the VFTO dominant frequency and the corresponding amplitude can be reduced by reasonable choice of DS closing sequence and PT installation site. Compared to the closing resistor, ferrite has advantages in suppressing VFTO. The peak of VFTO increases first then decreases with the increase of the length of the ferrite.
Fault Analysis of VSC Single-pole Ground Fault in Flexible AC/DC Hybrid Distribution Network
Authors: Liu Le , Kang Xiaoning , Zheng Mengyuan , Yuan Yanlei
Published: July 2019

The stable operation of the flexible AC-DC hybrid distribution network is inseparable from the configuration of the relay protection device, while the fault analysis and simulation research is the basis for the protection scheme selection. This paper introduces the current situation of fault analysis and protection research of flexible AC-DC Hybrid distribution network, and set up a model of radiated flexible AC-DC hybrid distribution network on PSCAD/EMTDC platform, then deeply analyzed the grounding fault of VSC single-pole short circuit of DC side. According to the simulation results, the trend and characteristics of the transient state after the fault are studied, which lays a foundation for the research of the subsequent relay protection method and the configuration of the protection device.
Design of the Disconnection Fault Detection System for Low Voltage Cable in Power System
Authors: Wang Bochuan , Wu Xixiu , Zhou Wei , Hu Yunfeng , Li Chao , Tang Jinrui
Published: July 2019

The paper proposes a designed scheme for the fault detection system of low voltage cable breakage in power system. By analyzing the characteristics of low voltage power line communication channel, establishing the channel characteristic model and comparing the measurement data with the simulation model, the author summarizes the impedance characteristics, noise characteristics and attenuation characteristics. It can be concluded that the suitable frequency range for communication is between 120kHz and 20kHz. The signal modulation method is studied, that the spread spectrum modulation is a preferred method. It also shows good results in the simulation. The object testing is done. The device and test method selected by author can be used to realize the early warning function of the power system low-voltage cable disconnection fault.
Design and Application of Portable Fault Indicator Detector Based on Internet of Things
Authors: Qiufeng Long , Yi Wen , Xiaobing Xiao , Lingcheng Feng , Shihua Xu , Wei Zhang
Published: July 2019

In order to solve the problem of detecting the fault indicator in the field, a design scheme of the portable fault indicator detector based on the Internet of Things is proposed. Firstly, the overall architecture of portable fault indicator detector based on Internet of Things is designed. Secondly, the system architecture of portable fault indicator detector is designed from two parts and seven aspects. Then, the hardware architecture of UPS power module, AC power amplifier module and human-computer interaction module is designed in detail. Finally, the main functions and detection methods of the portable fault indicator are discussed. The case analysis shows that the portable fault indicator detector based on the Internet of Things has greatly improved the time, manpower and cost of detection compared with traditional detection methods, and can conveniently meet the needs of on-site inspection personnel.
Status Detection Evaluation Method of Distribution Network Fault Indicator Based on Artificial Intelligence
Authors: Qiufeng Long , Qiansu Lv , Xiankui Wen , Shaolin Wen , Jianhui Wu , Wei Zhang
Published: July 2019

In order to solve the problem of status detection evaluation of field operation fault indicator, a status detection evaluation method of distribution network fault indicator based on artificial intelligence is proposed. Firstly, the fault indicator status detection evaluation model is established, and the result information of fault indicator detection using portable detector is described by fault indicator status detection information matrix. Secondly, based on the principle of “3 selection 2”, the fault indicator status detection comprehensive result table is established. Then, the same factory fault indicator status detection evaluation matrix and the fault indicator single state detection comprehensive evaluation matrix are established to evaluate the 10 functional detection results of a single fault indicator of a manufacturer. Secondly, the fault indicator sub-detection comprehensive evaluation matrix is established to describe the evaluation results of all fault indicators in the same plant on different sub-function detection. Finally, the comprehensive evaluation results of all fault indicator detection in the same plant are evaluated by means of the average method. The example analysis shows that the method described in this paper can evaluate the status detection results of fault indicators from three aspects: individual, sub-item and comprehensive, which has good practical significance.
Research on Multiple Security Authentication Schemes for Mobile Applications of Power Trading Platforms
Authors: Shi Shuhong , Wang Lei , Zheng Shiqiang , Lv Jingwei , Zhang Qian
Published: July 2019

The development of mobile technology and the Internet has brought many potential threats while bringing convenience to users. Aiming at the leakage of private data and transaction sensitive information in mobile trading market, we study the multi-security authentication support technology of mobile transaction mobile application, and analyse the common mobile application content, document protection technology and mobile signature protection technology. Based on the identity authentication technology of mobile application and the security considerations of members and transaction data in the power trading market, an identity authentication technology using SMS verification code, mobile phone shield, face recognition and fingerprint identification is proposed to protect the mobile transaction mobile application transaction. Anti-leakage of market member privacy data and transaction-sensitive information. In order to verify the effectiveness of the proposed scheme, we carry out the simulation experiment. The experimental results show that the proposed scheme can effectively protect the privacy of users.
Research on Smart Safety Electronic Fence Technology Based on Image Processing
Authors: Qin Liu , Minkun Wang , Kehang Xu , Jiawei Zhang , Junhu Xie , Jiong Chen
Published: July 2019

With the development of scale of the power grid, the phenomenon that the construction personnel across the safety fence at will occurs frequently, which brings great hidden trouble to the safety production. In allusion to the existing problem of the safety fence without monitoring and alarm function, in which the principle of inter-frame difference method is used to screen out the illegal workers, making accurate diagnosis of the illegal behavior, and sending warning information to remind the illegal workers by using the method of trajectory tracking of moving object to filter out the random disturbance signal, so as to ensure the safety of the construction.
Research on Energy Optimizing Management Technology of Submarine Cable Salvage Robot
Authors: Hao Zhang , Xin Shi , Rong Li , Sun Li , Yubing Duan , Xiaoli Hu , Hui Liu
Published: July 2019

In the design of submarine cable salvage robot, considering the limitations of weight, space, cost and many other factors, the robot can only carry energy storage devices with limited capacity. In the process of dynamic regulation, current sharing technology is used to ensure safe operation. In the steady state operation, through the optimization of load distribution scheme, the optimal control of overall efficiency of energy storage device can be achieved, the utilization efficiency of storage energy can be improved, and the overall operation performance of electrical system can be improved
Application Research of 35kv Switching Shunt Capacitor Banks with Phase-Controlled Circuit Breakers
Authors: Wu Guoxing , Zhang Jingzhuo , Wang Peng , Liao Weixing , Ji Xinchi , Lai Zhenyu
Published: July 2019

In recent years, two series reactor faults occurred when a 35kV shunt capacitor bank was cut by a circuit breaker in a 500kV substation in Shenzhen. The reason is analyzed that the large inrush current and overvoltage generated during the switching process caused interturn short circuit fault of the reactor, which seriously threatens the safe operation of the system. To avoid such faults, intelligent phase-controlled short-circuit breakers were used to suppress the closing inrush current and reduce the probability of reignition. To verify the effectiveness of the technology, this paper introduces the causes of switching inrush current and over-voltage and the principle of phase-controlled suppression technology, and then applies the technology to a 500kV substation in Shenzhen. Multiple switching tests are carried out on the intelligent and ordinary circuit breakers respectively. The results show that the maximum inrush current generated by the ordinary circuit breaker is 4.2p.u., and the overvoltage is 1.81p.u. While the maximum inrush current of the intelligent phase-controlled circuit breaker is 2.3p.u., and the overvoltage is 1.4p.u. The results confirm that the application of the intelligent phase-controlled switching technology can suppress the inrush current and overvoltage, thus fundamentally improving the reactive switching efficiency and system safety.
Study on Tree-wire Critical Breakdown Distance of 500kV Transmission Lines
Authors: Liu Zhenyao , Guo Rong , Kang Yubin , Chen Xuan , Fan Xiaodong , Wang Yang
Published: July 2019

Flashover fault is an important cause of trip or even outage of transmission lines. In order to reduce the occurrence of tree flashover failure and strengthen the management of tree growth in the transmission line corridor, it is necessary to study electric field and potential distribution characteristics of trees below transmission lines. Firstly, the influence of tree dielectric constant and conductivity on 3D modelling is analysed. Then the actual 3D simulation model is established. The spatial electric field and potential variation of trees with different shape crowns and different heights and horizontal distances are studied. The starting field strength of flow is used as the gap breakdown criterion, and the critical breakdown distance under different power supply phase angles is calculated. Conclusion shows that the critical distance of tree flashover of 500kV transmission line is 1.76m. In practical applications, trees should be avoided too close to the wire.
Analysis and Treatment of the Deterioration Products of Fire-Resistant Oil
Authors: Ya’nan Hao , Naihai Yu , Guodong Qi , Jiafeng Qin
Published: July 2019

The 300 MW unit of a power plant is resistant to fuel, and its color is reddish brown. The acid value and resistivity are in line with the standard requirements. However, a large amount of sludge appears in the same grade of oil, causing the filter to be blocked and unable to supply oil. After the oil is filtered by the online oil filtering device, the degraded anti-fuel oil and the new oil are mixed and there is still sludge. In order to solve this problem, the components in the anti-fuel oil were tested and the acid value, moisture, resistivity, particle size and sludge precipitation test were tested. The cause of the sludge in the mixed oil was found and the treatment method was found. The oil samples were adsorbed by diatomaceous earth, activated clay and strong polar silica-alumina, and the parameters were analyzed after treatment. It was found that both activated clay and polar silica-alumina adsorbent have better purification functions, but the polar silica-alumina adsorbent is better and effectively solves the problem of fuel resistance degradation.
A Study of Over-modulation Impact on the MSI Series Micro-Grid Output Voltage
Authors: Ding Yingjie , Wang Xinggui , Yang Weiman
Published: July 2019

In order to analyse the over-modulation technique impact on the micro-source inverter (MSI) series micro grids (SMGs) output voltage, firstly Double Fourier method applied to derive the single inverter output voltage characteristics under over-modulation condition; Secondly, based on the characteristics of the MSI series micro-grids, a new formula of the system output voltage is derived. Thirdly, the impact on the system output voltage fundamental component and harmonic component is analysed in detail, the results show that the output voltage fundamental component increases with the increasing modulation while keeps constant after a certain over-modulation depth. Finally, a simulation was carried out and the simulation verified the theoretical analysis.
Load Curve Modeling Based on Behavior Analysis of Distributed Power Customers
Authors: Han Xinyang , Zhang Yu , Jiao Yuqiao , Zhang Yue , Qu Yanjing , Ding Min
Published: July 2019

As renewable power generation directly affects the customers’ traditional electricity behavior and then offsets the power load, this paper proposes a load curve modeling method for renewable power customers based on the behavior analysis. Firstly, customers’ active behavior is represented by the quantity of active customer households. Based on the analysis of customer behaviors, a modeling method for the quantity of active customer households is proposed based on Markov Chain Monte Carlo method. Then, with the inputs as the quantity of active customer households and time of photovoltaic power generation, an inference model based on fuzzy logic is proposed to get the quantity of customer household starting electrical appliances. By combing the average usage time of electrical appliances, load characteristics are analyzed based on usage state of electrical appliance of distributed power customers. Finally, the simulation results verify the effectiveness of the proposed method.
Research on Suppression Technology of Electromagnetic Interference in CAN Communication
Authors: Li Weibo , Xu Cong , Li Wei , Li Qi , Lu Yue
Published: July 2019

CAN communication is a relatively common communication method used in the industrial and automotive fields. It analyses the main cause of communication interference in the electromagnetic interference phenomenon of CAN communication in industry. Due to factors such as circuit imbalance and space electromagnetic field, the CAN bus will cause common mode interference due to radiation. The strong interference generated in the field may cause the relay to malfunction and cause the wrong signal. Therefore, this paper proposes protection measures against the malfunction of the relay from the perspective of signal input and relay triggering, and has strong anti-interference ability after testing in actual projects.
Short-term Power System Maintenance Scheduling with Imperfect Repair
Authors: Xu Bo , Xu Shenzhi , Zhang Yumin
Published: July 2019

Most of the existing research in short-term power system maintenance scheduling assumes that repair is minimal when equipment fails. However, this may not always be the truth because sometimes repair after failure is imperfect. This paper investigates the impact of imperfect repair on power system maintenance scheduling. Unlike previous research which didn’t consider imperfect repair, a condition-based maintenance optimization model is proposed. The model focuses on equipment deterioration failure. Firstly, a new equipment state-space diagram under imperfect repair is given. And then, the availability of power equipment considering maintenance schedule and imperfect repair is derived using the Markov process theory. Based on that, in order to determine the optimal equipment maintenance schedules, the expression of system outage cost is given. Finally, system outage cost is minimized to optimize equipment maintenance schedules. A case study is used to illustrate the effectiveness and significance of the proposed model.
Test and Simulation of Potential Distribution of UHV AC Arrester under Different Conditions
Authors: Zhang Pipei , Shi Wei , Wang Hui , Sun Jingwen , Wang Peng
Published: July 2019

UHV AC arresters will be degraded to varying degrees due to the operating environment, including long-term moisture, breakdown and short circuit of the resistor, which makes the increasing unevenness of potential distribution, leading to a larger area of damage and even a safety accident such as arrester explosion. Hence it’s need to analyze the potential distribution of arrester under different conditions. This article carried out a series of tests of the potential distribution of UHV AC arresters when partial damp and partial short-circuit using optical fiber current method, and established the corresponding ANSYS 3D simulation model according to the actual structure and the test method, which is used to calculate the potential distribution under the corresponding test conditions. The consistency of the test and simulation results verified the correctness of the simulation model.
Simulation of Influence of Generator Leading Phase Operation on Voltage and Loss of Gansu Power Grid
Authors: Zhang Yuze , Tong Xinyu , Xu Suping , Sun Yuning , Cheng Rui
Published: July 2019

Generator leading phase operation can not only absorb excess reactive power under small load operation mode, but also smoothly regulate grid voltage to cope with abrupt changes in grid operation. Based on the summer small load typical operation mode of Gansu Power Grid, four calculation conditions are selected to calculate power flow, and the influence of generator leading phase operation on grid voltage and loss is simulated and analyzed. The simulation results show that no matter how the active power output distribution of generators changes in the power grid, the voltage level of the power grid under small load can be significantly improved by generator leading phase operation. However, the grid loss will increase when the generator is in leading phase operation.
A Review of Price Risk Management in PJM and Nord Pool Electricity Market
Authors: Wang Ning , Zheng Wei , Chen Hao , Tu Teng , Yang Yang , Ding Yi
Published: July 2019

Market participants and system operators are faced with price risks caused by various factors, such as congestions or market power abuse. Therefore, the price risk management in deregulated market environment is of great importance. In this paper, various risk-hedge financial instruments in PJM and Nord Pool, such as FTRs, futures, forwards and CFDs are investigated. These risk management mechanisms can be further utilized for congestion revenue allocation, speculation or arbitrage under different market circumstances.
Autonomous mobile robotic system “Sesarma”
Authors: Abbasov I B , Ignatyev V V , Orekhov V V
Published: July 2019

The present paper is dedicated to computer modeling of the autonomous mobile robotic system. The review of publications and analogues is performed; the structure diagram and design of the developed robotic system are presented. The search for a robot body concept is carried out; a stage-by-stage process of its three-dimensional modeling is presented. The body lines are created using a high polygonal modeling method. The process of setting and assignment of materials based on polygonal model elements is described. A renderer is selected and light sources are installed, final scenes of scene rendering with robot are shown.
Defining boundaries of CNC turning efficiency
Authors: Abrazhenin A A , Trushin N N
Published: July 2019

The study considers the problem of defining the quantitative value of design complexity of a general mechanical engineering workpiece through the analysis of its three-dimensional electronic model in the absense of statistical data on similar workpieces. During machine-building preproduction there is a need for quick assessment of design complexity of the developed product. Such assessment allows defining the design cost, determining the performance level of a designed workpiece, creating complexity priorities to split the processing operations between manual and NC machines.
Ultrasound application for detection of inhomogeneities in two-layer sheet
Authors: Afanasenko V G , Boev E V , Kulakov P A
Published: July 2019

The paper presents data on the influence of additives of the pre-treated aluminium oxide powder on the structure of cast lead-tin-based bronzes. Different quantities of the modifier, based on the superdispersed aluminum oxide powder, were added to the bronze melt. The studies have shown that addition of a small amount of aluminum oxide powder (0.07…0.25 %) allows modifying the microstructure of the obtained castings. This modification includes grain refinement, reduction of the matrix dendrites size of tin solid solution in copper, as well as formation of spherical inclusions of the low-melting phase – lead. In this case, the addition of such modifier influences weakly the morphology and the quantity of solid eutectoid inclusions based on electron compound Cu31Sn8.
Study of water-oil mixture separation in bottomhole area via drift flow model
Authors: Almukhametova E M , Karimova A A , Almukhametov F F , Gabdrakhmanov N Kh , Gabzalilova A Kh , Garifullina Z A
Published: July 2019

The existing methods to study the movement and pattern of flow in wells with electric submersible pump (ESP) within the ‘bottomhole-pump-wellhead’ system are rather experimental and empirical. Hence, the lack of universal techniques considering all possible operating modes of wells does not allow using the existing techniques to elaborate the measures improving the efficiency of well operation with ESP. Besides, these techniques cannot always be applied to define the optimum operating modes and to determine the need for various well intervention jobs as they are not quite perfect. The improvement of profitability of well operation is intimately connected with deliberate change of flow properties and structure considering various physical properties of fluids and ESP-based operating modes with further formation of fine emulsions. In this regard, the modern petroleum industry is facing an urgent task to study the processes in a bottomhole and a wellbore zones using a generalized mathematical model with further analysis of various perturbing actions on emulsion stability, assessment of its decrease and separation of the water phase within subsurface equipment.
Improvement of rock crushing quality based on load specifications set for electrically-driven hydraulic drilling rigs
Authors: Antonenkov D V , Manusov V Z , Tsarev R Yu
Published: July 2019

The analysis was completed on the main production factors which determine energy characteristics of an electrically-driven hydraulic roller-bit drilling rig during drilling operations under the condition of the Far North deposit. In addition, the correlation ratio between the parameters and electric energy consumption was analyzed for the DM-H drilling rig. The equations expressing the relation of the drilling rig load to the drilling speed have been identified. In order to improve the quality of rock crushing, we have modified the method of determining the properties and condition of the rock mass in order to correct the connection layout of the blasting circuit, the activation system, the change in the type of an explosive agent, as well as the composition and weight of the blasthole charge. The proposed approach allows reducing the cost of drilling and blasting operations by 6 % through the improvement in the accuracy of the designed physical and mechanical properties in terms of both the stratum depth and the strike of the mining block.
Hypergraph model for assembly sequence problem
Authors: Bozhko A N
Published: July 2019

The article deals with the assembly sequence problem of complex technical products. It is shown that geometric coordination of parts in a product is a variable arity relation. In general, this relation cannot be described by graph means. The hypernetwork and hypergraph models are proposed. It is shown that the mathematical description of coherent and sequential assembly operations is a normal contraction of edges of the hypergraph. The notion of an s-hypergraphs is introduced. It is shown that s-hypergraphs correctly describe structures of technical systems. A theorem on necessary conditions for contractibility of s-hypergraphs is proved.
Development of mathematical models of micromechanical devices
Authors: Bibikov S V , Bolshakov V O , Kalinkina M E , Korobeynikov A G , Pirozhnikova O I , Tkalich V L
Published: July 2019

The article is devoted to the temperature error of micromechanical accelerometers, as well as the development of structural and technological solutions to improve the accuracy parameters of micromechanical devices, primarily the stabilization of output parameters. To reduce the error, a number of methodologies and design and technological solutions were developed that helped to improve accuracy, i.e. reduce temperature error. Analytical methods for estimating errors, methods for analyzing the effect of temperature on a measuring circuit and identifying elements that lead to a distortion of the measuring function of conversion were considered. Different types of errors were considered. Used statistical methods. Calibration issues considered. The proposed techniques can significantly improve the accuracy of determining the error model coefficients, as a result of which a more accurate accelerometer calibration is obtained. The use of the algorithmic component has significantly reduced the effect of temperature on the output signals.
Automatic packer reliability prediction under pulsed transient flooding of hydrocarbon reservoirs
Authors: Ya Khabibullin M , Suleimanov R I
Published: July 2019

For pulsed transient flooding of hydrocarbon deposits (installed on the tubing string below the packer) of the injection well, hydraulic impulse devices are used. When they work (generation of pulses in the injected fluid) in the tubing string, hydraulic shocks occur at a frequency equal to the output frequency of pulses generated by the devices. The result is a reciprocating movement of the tubing string and the packer. Hence, for effective injection of fluid, it is necessary to provide automated long-term reliability of the sealing elements of the packer and long-term sealing of the annular space. Joint movement of the packer and pressure pulsation intensify mechanochemical aging processes. To improve durability of packer seals during long-term pulsed injection of fluid into the well, it is necessary to replace rubber materials with rubber-fabric materials and use damping equipment along with impulse devices. Their use will significantly reduce the amplitude of packer oscillation (stroke length of sealing element S) and maximum accumulation time Wmax.
Computer simulating of strength characteristics for deformable chambers and most loaded mixer elements with a vertical shaft
Authors: Lozovaya S Yu , Lozovoy N M , Uvarov V A
Published: July 2019

The article presents computer simulating of strength characteristics in deformable chambers and loaded mixer elements with a vertical shaft to determine structural parameters of a bearing frame and a deformable chamber regarding strength and rigidity conditions.
Intelligent systems for monitoring and controlling chip formation when cutting difficult-to-machine materials
Authors: Maksarov V V , Makhov V E
Published: July 2019

This research addresses topical issues of creating industrial monitoring systems for chips, which are formed when materials are cut, based on light field-based optical detectors. A proposed scheme uses a light field (LF) method to register formed chips with an optical detector. An algorithms and monitoring methods for key geometric parameters of chip shapes are developed based on the analysis of images obtained from LF cameras. They feature digital image capturing and morphological analysis. For practical implementation of developed algorithms, National Instruments software platform is used. This research shows that the result accuracy in determining geometric characteristics of chips using the proposed solutions makes it possible to run diagnostics for cutting and material processing equipment.
Milling equipment modernization: a unit for utilizing fibrous waste of woodworking production
Authors: Mihailichenko S A , Dubinin N N , Goncharov S I
Published: July 2019

Reprocessing of natural and technogenic materials, recycling of industrial waste, production of goods at the first stage is associated with grinding of materials. Standard grinders often do not meet the performance requirements, while having high energy and significant metal consumption. When woodworking industry waste is recycled in order to produce thermal insulation, technologies, including standard equipment, both for processing of raw materials and producing the end product in the form of compressed granular material are used. This research examines a method of producing thermal insulation materials and solving the issues of grinding organic fibrous materials in a multifunctional grinding unit.
The design model of the electrical conductivity of a poroelastic thrust bearing
Authors: Opatskikh A N , Solop S A , Kolobov I A
Published: July 2019

The article is devoted to the formation of calculation of hydrodynamic models of a poroelastic thrust bearing profile adapted to the friction conditions, taking into account the dependence of the penetrability of the porous layer on the guide surface, the electrical conductivity and the viscosity of the liquid lubricant under pressure. There has been the evaluation of the elastodynamic parameter (M), adapted to friction conditions with the profile and parameters, characterizing the dependence of the electrical conductivity, viscosity of the lubricant and penetrability of the porous layer under pressure on the carrying capacity and friction force.
Information technologies in teaching chemistry to future specialists in automated engineering
Authors: Saigushev N Y , Vedeneeva O A , Kashuba I V , Tsaran A A , Shcherbakova I A
Published: July 2019

The article reveals the problem of using information technologies in the process of teaching chemistry to future specialists in automated engineering. The modern level of development of automated engineering requires highly educated specialists, creative people capable of free thinking. This sets a task for higher education to develop methods for the development of such competitive personality. In recent decades this task has been successfully solved through the development and implementation of various information technologies in the educational process.
Modeling of technological processes at enterprises of timber processing industry
Authors: Shanin I I
Published: July 2019

Dynamic development of the Russian market of timber products and tightening of technological advantages give particular relevance to the use of advanced technological methods to optimize the production process. It will lead to an increase in the competitiveness of enterprises. Improvement of approaches to managing the technological development of enterprises, their provision with various types of innovative resources and technologies for the optimal use of all reserves of industrial enterprises is of particular importance in the context of the formation of effective areas of production system technological development. The following should be noted in terms of the development of woodworking equipment production. 23 factories produced 30–35 thousand woodworking machines and lines per year in the Russian Federation in the early 1990s. Currently, according to Rosstat, only 4–6 thousand units of woodworking equipment are manufactured. Machine-tool enterprises sharply reduced output or ceased to exist since most of domestic woodworking machines turned out to be uncompetitive in comparison with the equipment of leading foreign companies. In recent years, there has been an increase in the tendency to reduce the relative share of consumption of domestic woodworking equipment on the Russian market. Share of domestic equipment decreased from 29 % to 7 % according to expert estimates in the period from 2000 to 2017. Accordingly, imported equipment makes more than 91 % on the market. The article has reviewed and analyzed furniture enterprises of timber industry complex connected with woodworking process.
Tests of energy-saving additives to engine oils on gasoline engine stand
Authors: Boiko M V , Nikogosov M V , Ponomarenko A G
Published: July 2019

The influence of energy-saving engine oil additives on the parameters of the internal combustion engine has been studied. The tests were carried out on a stand with a 4-stroke gasoline engine. The additives contained a pentaerythritol ester and a complex compound of copper or molybdenum. It is shown that the introduction of additives in motor oils SAE 10W40, SAE 30 reduces fuel consumption, reduces the content of CO and CH in the exhaust gases. The resulting effect is explained by the formation on the conjugate surfaces of a tribopolymer antifriction film, which reduces the gap between the piston and the cylinder. This leads to an increase in compression and a more complete combustion of fuel.
Development of microwave plasma method for measurement of wear particle parameters in lubricant oil samples from aircraft gas turbine engines
Authors: Drokov V G , Drokov V V , Ivanov N A , Myrishenko V V , Skudaev Y D , Hodunaev A Y
Published: July 2019

The paper describes the new microwave plasma method for gaining information about wear particles in oil samples from aircraft gas turbine engines (GTE). The method allows one to measure the element concentration in the form of wear particles (the size is more than 2 micrometers), element concentration in the form of metal-organic admixture and sub-micrometer particles (less than 2 micrometers), quantity and elemental composition of particles simultaneously and in real time. The microwave plasma analyser has electrodeless microwave plasmatron of original design, which allows for the proportional ratio between size of particles and the output signal for particles less than 60 micrometers in size. For this analyser, the ratio of quantity of wear particles hitting axial (high-temperature) plasma regions to overall particle quantity is no less than 0,95. Compressor pumped air is used as a plasma-forming medium. For analysis of the oil sample from the oil filter, new diagnostic features are suggested and their relation to the technical state of the engine is suggested.
Ultrasonic sprayer of liquid samples for atomic-emission microwave plasma analyzer
Authors: Drokov V G , Drokov V V , Kaloshin A E , Skudaev Y D , Myrishenko V V , Hodunaev A Y
Published: July 2019

The design of an ultrasonic sprayer of aviation oils is proposed and its performance is investigated. Theoretical and experimental studies have been conducted to study the response of the spray tube when exposed to ultrasonic vibrations. Its resonance lengths are determined for given frequencies of ultrasonic vibrations. The aerosol flow parameters are estimated (length, flow diameter, droplet size), and the coefficient for the entry of particles of the analyzed metallic impurity in the sprayed liquid into the plasma is estimated.
Analysis and experimental evaluation of contact interaction of simple punch shapes with concrete
Authors: Furmanov D V , Klochko N N , Tyuremnov I S
Published: July 2019

The article presents the results of the study of contact interaction of cylindrical, conical and roller-shaped punches with concrete. The stress-strain state of the material is assessed during penetration. The paper discusses how the angle of tapering of a simple punch shape affects the contact strength of the material. There are some hypotheses in the paper that describe the nature of the interaction of simple punch shapes with the material, there is a high convergence of the results with the main provisions of the mentioned hypotheses. In particular, it is found that the contact stresses in the area of contact of a punch with the material in areas significantly exceeding the strength limit of concrete can be characterized by the ratio of the strained volume of the material to the volume of the pressure bulb of the material. Its size is determined by the properties of the material.
Consideration of various factors influencing acoustic logging equipment production accuracy
Authors: Gilmanova A M
Published: July 2019

To improve quality of technological machines and equipment, quality and reliability of the downhole material obtained using acoustic logging equipment, it is necessary to take into account all factors affecting reliability and accuracy of the tools at all the stages of their life time - development, production, operation, and interpretation of the well material. The analysis results are presented in the diagram generalizing the principles of high-precision acoustic logging equipment production optimization.
Modernization of the Audi 90 suspension in preparation for the rally
Authors: Kamerloher V A , Naiman R V
Published: July 2019

The paper considers the vehicle sports – technical sports. The authors put special emphasis on racing, rally and some other kinds of technical sports where ground-based vehicles, i.e. cars, are employed. The work is devoted to the history and evolution of the racing sport and technical development of sport cars. In addition, the authors also mention the founders and geography of spreading the sport since its origin. The classification and design of racing cars are analysed and discussed in this paper. Technical requirements and standards have been taken into account while considering the peculiarities of the sport cars, without which no sport car is allowed to participate in any sport motor racing event.
Application of mathematical modeling to optimize the operation of a tubular oil heating furnace
Authors: Osintsev K V , Prikhodko I S
Published: July 2019

An energy balancing scheme has been developed for building a mathematical model of a tubular furnace for heating oil in accordance with the principle of its operation. This will allow taking into account all the heat fluxes, and the result of the work will be a reduction in fuel consumption for the tube furnace. The use of a particular calculation scheme depends on the nature of the task and the features of the boundary conditions of heat transfer. The main factors when choosing a calculation scheme are the accuracy and duration of the calculation. The scientific novelty is that for a tubular heating furnace for the first time it is proposed to use the method of energy balances in the chambers of radiation and convection. The practical significance of the work is to reduce fuel consumption for a tube furnace, as well as the possibility of utilizing the heat of oil refining products when building a mathematical model of a distillation column. The calculation algorithm using the energy balances method for mathematical modeling of heat transfer processes allows balance equations for all furnace sections, including the radiation chamber and the convection chamber. After which several successive approximations are carried out using linear programming. In addition, there are technological solutions to optimize fuel use.
Nitriding of multilayer steel materials
Authors: Plokhikh A I , Polikevich K B
Published: July 2019

The paper presents results of the metallographic study aimed to determine the impact of the structurization degree of multilayer metal materials on the parameters of diffused layers in the course of thermochemical treatment by nitriding. It is demonstrated that reduction of the laminar layer thickness from 100 to 2 μm results in more than twofold increase of the diffused layer in comparison with the reference polycrystalline sample. It is determined that more significant structure refinement for multilayer materials particularly to the estimated layer thickness of 0.3 μm massively reduces the depth of diffusant penetration into the material along the laminar boundaries.
Mobile lubrication and filling units to reduce mining machines and equipment downtime when providing maintenance
Authors: Safronchuk K A , Knyazkina V I , Ivanov S L
Published: July 2019

Currently in the mining industry there is an observed increase in demand for portable lubrication and filling units used by technical maintenance and repair of different quarry machinery. These oil-servicing mobile workshops provide the possibility to organize maintenance at facilities, situated far from each other, and quick delivery of everything necessary for technical maintenance and repair at mining machines and equipment operation location.