bluuebunny/crossref_metadata_2025_split huggingface dataset:
Identification of electrical equivalent circuits of research objects by phase-frequency characteristics
Authors: Medvedeva Svetlana N , Chernetsov Vladimir I , Chernetsov Mikhail V , Chernetsova Margarita M 
Published: May 2020

Abstract
The paper discusses methods for identifying electrical equivalent circuits of the studied object based on the analysis of phase-frequency and differential phase-frequency characteristics of the output signal in a wide frequency range, using MathCAD software. As a result, the following possibilities are revealed: establishing a method for connecting several electrical links of the same type in a single electrical circuit; identification of topology of bipolar electrical equivalent circuits for parametric sensors of various types, both separately and as part of bipolar electrical circuits; identification of equivalent circuits of metal-insulator-semiconductor (MIS) structures described by equivalent amplitude-frequency characteristics. A technique for the analysis of electrical equivalent circuits is proposed, based on the study of phase characteristics in the coordinates of phase-frequency and differential-frequency dependencies, called by the authors as “phase portraits” of equivalent circuits of the parametric research object, which allowed determining changes in the values of the equivalent circuit elements. This approach is promising from a metrological point of view, since in measuring phase-frequency parameters, frequency being the most stable parameter measured with very high accuracy compared to other analog values, can be used as a measure to increase the objectivity of the analysis result.
The study of the stress-strain state of the elements of the flange connection under the influence of internal pressure
Authors: Tukaeva R B , Bayazitov M I , Enikeeva A A 
Published: May 2020

Abstract
One of the main requirements that is presented to flange connections (FC) is to ensure uniform tightening torque of fasteners. Violation of this condition may lead to a decrease in FC reliability and an emergency. Regulatory calculations of FC for strength and tightness are carried out under the assumption of creating and maintaining during operation a uniform tightening force of fasteners. There is no information in the literature about whether and how the uneven tightening force affects the stress-strain state of a flange joint. In this paper, we propose such a study based on the method of modeling the stress-strain state of a flange connection. At the first stage, to select the initial data and develop the model, calculations were performed on the strength and tightness of the flat weld flange based on the PASSAT software package. Based on the analysis of changes in bolt loads and stresses, the FC parameters and loading conditions were determined, which are implemented during the development of the FC model and are described in our second article.
Formation and burning of soot particles in a diesel cylinder when working on ethanol-fuel emulsion
Authors: Likhanov V A , Anfilatov A A 
Published: May 2020

AbstractThe chemistry of the processes of formation and burning of soot particles in a diesel cylinder is associated with a large number of chemical reactions and is very complicated. During combustion, the fuel supplied to the engine cylinder does not completely burn out. Complete combustion is hindered by a number of factors: the limited mixture formation and combustion processes in time, the imperfection of the fuel supply and atomization processes, and the uneven concentration of oxygen and fuel. So, with a lack of air and a high temperature of the air charge in the engine cylinder, the supplied fuel undergoes pyrolysis with the formation of products of incomplete oxidation: carbon monoxide, aldehydes, carboxylic acids, soot, and various heavy hydrocarbons. Soot has a large specific surface area, up to 75-80 m2/ g, which leads to its high absorbent capacity. Therefore, when it settles in the engine’s exhaust system, soot absorbs unburned hydrocarbons like a sponge, forming black, ointment-like deposits. With increasing temperature of the exhaust gases, for example, with an increase in engine load, these deposits are prone to ignition.
Post-production lifecycle phases of the fifth technological paradigm based heavy equipment vehicles
Authors: Ignatov V I , Sirotov A V , Tarlakov Ya V , Tesovskiy A Yu , Lapin A S 
Published: May 2020

Abstract
According to the current data Russian Federation is using the considerable amount of outdated heavy equipment vehicles of the third and forth technological paradigm. Some of these heavy equipment vehicles are being used for more than ten years already. At the same time the developed countries have successfully implemented the fifth technological paradigm and are currently advancing towards the sixth technological paradigm. The government of Russian Federation made a decision to improve the capabilities of the heavy equipment vehicles with the benefits of the fifth technological paradigm. This approach requires manufacturers to implement new technologies in product life management including update to the system of technical support to incorporate international standards.
Theoretical calculations of the volume content of nitrogen oxides in a diesel cylinder when operating on methanol
Authors: Anfilatov A A , Chuvashev A N 
Published: May 2020

AbstractThe results of theoretcal calculations on the change in the volume content of nitrogen oxides in the cylinder of a base diesel engine when operating on methanol with separate supply of two fuels, depending on the angle of rotation of the crankshaft, are presented. Their specific values have been determined, for the base engine, allowing to ensure an acceptable value of the concentrations of nitrogen oxides in the combustion products, by improving the design and adjustment characteristics of the diesel engine.
The digital twin of a warehouse robot for Industry 4.0
Authors: Fedotov A A , Sergeev S M , Provotorova E N , Prozhogina T V , Zaslavskaya O Yu 
Published: May 2020

Abstract
One of the most important components in the modern conception Industry 4.0 is the digital twin. The special feature of the mechanical engineering production is the high proportion of time, spent on an interoperational storage. High efficiency of the enterprise activity is connected with the solution of a flexible automatic warehousing system creation. It is necessary to describe structural and dynamic parameters of a robot-stacker in the math formalisms. This will allow to find the optimal ratio between the load capacity, cargo speed and statistic, dynamic indicators of positioning accuracy. The obtained results of a mathematical modeling can be used as the algorithms for an integrated environment of a software development for various automation systems of warehouse processes.
Control algorithms and capabilities of universal UAV
Authors: Mitrashchuk V V , Baranova M P 
Published: May 2020

Abstract
The area of unmanned aerial vehicles (UAV) has been studied for a long time. They are actively used for military purposes. Nowadays, their application in everyday life to solve the problems of ordinary people has become relevant. There are many UAV designs, but the issue of an effective universal UAV design has not been fully addressed. In this paper, it is proposed to consider a variant of the universal UAV design, which differs from existing solutions and requires the development of its own rules for generating a PWM signal, control and stabilization algorithms, and the assessment of technical characteristics and application possibilities. The paper provides a brief description of the main differences of the proposed universal design from other solutions. It is proposed to consider the necessary control algorithms for UAVs of universal design, which were tested on the developed mathematical model of the UAV flight process of universal design. The basic equations of motion of this UAV are presented. The optimal technical characteristics and examples of using the electric version of the UAV of universal design to solve the problem of processing the field when powered by rechargeable batteries or an electric cable are considered.
Program control of the group of boilers at chp plants (chpps)
Authors: Sokolov Ya A , Shamlitsky Ya I , Korchikov D A , Semidotskiy D A , Boyko D A , Rozmanov I V 
Published: May 2020

Abstract
At Krasnoyarsk CHPP-2, there emerged a necessity of supplying heat to consumers faster in cold months because even short-term absence heating can be critical. The main challenge is to execute complex control process for all boilers at the same time to ensure their gradual heating or cooling. In order to solve this problem, it is suggested to create program control. The software that needs to be created should quickly (7-9 minutes) change the power and control their operation in a timely manner in case of any changes, taking into account the individual specifications of each boiler. Final testing and examination are proposed to be carried out on the created CHPP model.
Digital technologies in mechanical engineering: perspectives, risks
Authors: Borisov A I , Yakovlev S E 
Published: May 2020

Abstract
The relevance of the topic is justified by the rapid development of digital technologies in various spheres of life. The purpose of the article is to review the basic concepts associated with digital technologies. This phenomenon has found a place in almost all industries as an integral part of the final product. In this article, an overview of the basic concepts that explain the meaning of digital technology in engineering. The use of digital technologies in industry today for maximum automation of production processes, robotization, creation of deserted technologies - today it is a key vector of technological development of production facilities around the world, which determines their competitiveness. These technologies will be used directly by enterprises and organizations of machine-building, instrument-making and other industries. As a result of this, the economic effect of the use of new technologies will be the exponential growth of income, productivity growth, and as a result, the growth of competitiveness.
Development of Industrial Control System project for handling goods stored in a finished goods warehouse of bulk goods producers
Authors: Gdanskiy N I , Filinskaya J A , Grigoryan G R 
Published: May 2020

Abstract
Nowadays in the Russian Federation, automation of the main production unit along with additional mechanized side lines is very typical for non-food producers of bulk goods built in the USSR. This pattern is usually supported by outdated mechanical equipment in the side lines that requires manual control of processes. Therefore, the situation when the finished goods warehouse is the weak spot of the enterprise is very common. It may reduce the overall productive efficiency, increase manufacturing costs and decrease the main economic indicators of the entire enterprise. The article studies currently important development of a project of an automated control system for the process of handling goods in the finished goods warehouse (Industrial Control System for Handling Finished Goods), integrated into the centralized enterprise control system on the basis of a single information space. The paper is focused on the standard structure of a finished goods warehouse where the finished goods are reloaded into a temporary storage of bunker type. Standard scheme for installation of the operational units’ sensors is also considered as well as some issues of operational unit manual control management and common technological constraints. Key project objectives are formulated. A typical standalone operator task is formulated for the Industrial Control System for Handling Finished Goods. At the end of the article, a model for organizing the Industrial Control System for Handling Finished Goods algorithm into conceptual units is proposed.
Analysis of load distribution unevenness in ball screw with a separator
Authors: Abdulin R R , Bolshakov V V , Podshibnev V A , Samsonovich S L 
Published: May 2020

Abstract
The work is devoted to the actual problem of liner electromechanical actuator designing. The object of study is a ball screw with a separator, the presence of which in the design provides increased reliability and causes a lower manufacturing cost due to the absence of a nut with an internal thread. A calculated solid model of a ball screw with a separator is compiled, its stress-strain states are determined. The coefficient of the load distribution unevenness over the turns of the gears is determined for a different ratio of the diameter of the ball and the width of the bridge of the separator. The axial stiffness of the transmission is determined.
Study of the nature of destruction of castings made of 35HGSL steel after a long service life
Authors: Skryabin M L , Poyarkov M S 
Published: May 2020

Abstract
Today, castings of their alloy steels are an integral part of modern foundry production. In the process of obtaining castings, any defects inevitably appear. This paper deals with the issues of stone-like destruction of castings made of 35HGSL steel after a long service life. The paper compares the macro-and microstructures of the rock-like fracture and based on the analysis revealed that its causes are large grain and the presence of impurities in steel in the form of sulfides or nitrides, which are located on the grain boundaries and weaken them. The influence of ferrite layers around bainite grains on the presence of the studied defect was also revealed.
Research of stability of rotor of the knife grinding refiners
Authors: Vikharev S 
Published: May 2020

Abstract
An object of research is stability of provision of rotor in the knife grinding refiners. Dynamic and mathematical models of rotor in bearing support are developed. Expression for determination of force of a preliminary tightness in bearing support for stabilization of the situation of rotor is received. Amplitude of fluctuations of disk of rotor in bearings with tightness is much less than in bearings with gap. For ensuring stability of an interknife gap of refiners it is recommended to eliminate radial gaps in bearing knots, i.e. to use bearings with a preliminary tightness. It will allow to raise a technical resource of the grinding plate. The technique of researches can be applied in other high-precisionmachines, for example, in the metalworking equipment.
Intensification of heat transfer by mixing in pyrolysis units during oil waste disposal
Authors: Kolenchukov O A , Petrovsky E A , Mikhaylov A Yu , Bashmur K A , Smirnov N A 
Published: May 2020

Abstract
This article provides an overview of the most common mixing devices. Their advantages and disadvantages are presented, as well as a mathematical description of the heat transfer process. Revealed the most promising designs for mixing oil waste. The design of the developed mixing device is shown.
The technology of manufacture of the pistons of the heat engine by the method of liquid stamping
Authors: Skryabin M L , Poyarkov M S 
Published: May 2020

Abstract
Modern methods of production of heat engine pistons allow to strengthen individual parts of the piston with composite materials based on ceramics. The considered manufacturing technology allows reinforcing the bottom of the piston, thereby increasing the reliability of individual parts of the piston that perceive maximum temperatures during operation. The pistons obtained by this method have an increased heat transfer coefficient and a finer-grained metal structure. Also, the use of ceramic materials in pistons can increase the reliability and service life of engines.
Doubly fed inductor electric drive model for automation systems
Authors: Bronov Sergej , Stepanova Elena , Avlasko Pavel , Nukulin Nikolaj , Krivova Darya , Bisov Aleksej 
Published: May 2020

Abstract
The doubly fed inductor electric motor is the basis of the electric drive. It has two three-phase windings which can have different connection schemes: «separate connection», «star», «delta». Each scheme has its own advantages which are manifested in various modes of operation. The existing electric drive models are designed for the most used connection scheme «star». The models for other winding connection schemes are not available. This does not allow to study the modes of operation with other winding connection schemes. In doubly fed electric drives each winding can have its own connection diagram. The existing models also do not provide such an opportunity. The new models of the doubly fed inductor electric drive can be used with various winding connection schemes – «separate connection», «star» and «delta». Each motor winding can have its own winding diagram. The method of nodal potentials enables to simulate the windings switching during the process of their modeling. This model of electric drive is more universal than the existing ones and provides more research opportunities.
Geometric calculation of planetary rotor hydraulic machines
Authors: Kurasov Dmitry 
Published: May 2020

Abstract
Hydraulic and pneumatic volume displacement machines are commonly the most important and integral elements of modern mechanical systems. One of the known types of such machines is planetary rotor hydraulic machines (PRHM) with floating satellites in contact with central gearwheels. The numbers of the central gearwheels «waves» M and N may be different or the same. They are characterized by the absence of valves and loaded kinematic sliding pairs. The main task of design and calculation of PRHM is geometrical calculation of their gear elements. Such a task has to be solved in the case of a PRHM with two non-circular centre gearwheels and a PRHM with round and non-circular centre gearwheels. The developed method of geometric synthesis of PRHM allows to obtain profiles of PRHM gear elements.
Definition of factors limiting the growth of industrial production
Authors: Morkovkin D E , Gibadullin A A , Safarov B G , Alpatova E A 
Published: May 2020

Abstract
Issues related to the formation of new types of industrial production have been relevant in recent years, since it is industry that creates new technologies, products, provides human life and the existence of the state, in this regard, the authors of the study present this work. The transition of the industrial structure from one stage to another allows us to offer new scientific and practical solutions that ensure the development of industrial potential. The work revealed that industrial production in Russia is in stagnation and there are no changes in this area of activity. Based on the obtained data, a factor model was proposed, which made it possible to identify factors limiting the development of industrial production.
Organizing the cash flow management in the construction industry in the Russian Federation
Authors: Ketova К V , Rusyak I G , Kasatkina E V , Saburova E A , Vavilova D D 
Published: May 2020

Abstract
This paper presents a mathematical model of organizing the cash flow management in implementing an apartment building construction plan in the context of using an escrow account in the Russian Federation. A mathematical model of organizing the cash flow management implies an in-creased income of productive activities in the construction industry by means of changing the volume of sales in square meters and sale prices. Furthermore, a mathematical model enables us to determine the sales strategy of a construction organization, which would provide a minimum lending rate for minimizing a percentage rate which is paid by the construction organization. According to the monthly financing schedule of a building project, a mathematical model of organizing the cash flow management enables us to calculate the most suitable escrow account balance, as well as the volume of sales in square meters. Calculating rise in profitability of financial resources in the construction industry is exemplified by an average developer of one of Russia’s regions in which residential construction grows rapidly – the Udmurt Republic.
The analysis of changes in the payroll of information system support specialists during the Devops methodology implementing
Authors: Aliev I , Gazul S , Bobova A 
Published: May 2020

Abstract
For a wide range of tasks, especially in the field of software development, the use of modern platforms for virtualization and containerization of applications can significantly increase the density of computing nodes (virtual machines and containers) on the equipment. In addition, the use of CI and CD practices can save the working time of employees responsible for supporting such IT infrastructure. At the same time, specialists supporting such IT infrastructure should have a number of additional competencies. The purpose of this article is to analyze the cost of specialists supporting information systems built using virtualization technologies, cloud computing in the context of CI and CD practices. This article presents an analysis of all available relevant vacancies in Saint Petersburg and Moscow from the HeadHunter site. Also, the difference between the required competencies and the level of salaries of specialists supporting classical and virtualized, automated IT infrastructure is shown.
Face recognition methods
Authors: Dzhangarov A I , Suleymanova M A , Zolkin A L 
Published: May 2020

Abstract
Nowadays, a science as cybernetics is gaining popularity. World society is on the verge of digitalization a technological and social sectors of human life. One of the most popular areas of cybernetics is computer vision. Systems of video assistants that recognize images and objects are widely distributed, and social test and control systems are introduced in test mode. In this regard, the relevance of research in this area is extremely high. This paper provides an analysis of the available methods for recognizing faces in images and discusses the software implementation of one of them.
Contemporary state of the confidential information leakages through the cloud data repositories
Authors: Kalach A V , Timofeeva E A , Bakhteeva D A , Dayneko D D , Spirin VA 
Published: May 2020

Abstract
Information concerning the leakage of the confidential data held in the cloud repositories of Amazon, Mongo DB, in the file hosting of Google Drive kind, as well as cloud servers for back-up in the period of 2016-2018. Certain conclusions made concerning necessity for the development of the systems enabling information security with the use of the cloud technologies at the expense of cyber-resilience enhancement.
A parallel algorithm for finding the human face in the image
Authors: Zaynidinov H N , Mallaev O U , Anvarjonov B B 
Published: May 2020

Abstract
It is well-known that anyone who processes and analyzes image information needs a large amount of memory for storing images. For example, for storing a standard TV frame, if two of the three colors contain 2 bits for each of the 3 bits, the memory of at least 512×512 bytes is required. A passport image must be at least 64×64×64 bits (this requires more space than any other passport data). The problems associated with storage, search, and discovery are made more complex by processing and analyzing large numbers of images. The image contains a large amount of information, so it is natural for them to have excessive statistical, psychovisual and content information. Due to this redundancy, the process of digital image processing, image retrieval time, and storage capacity increase. The use of parallel technologies in digital processing of images plays an important role in solving the above problems. Therefore, the article presents an algorithm for calculating the process of extracting a human face from a color image using MPI technology.