bluuebunny/crossref_metadata_2025 huggingface dataset:
Comparative analysis of the influence of urea additives on the properties of poly(vinyl alcohol) cryogels formed from the polymer solutions in water or dimethylsulfoxide media
Authors: Yu Kolosova O
Published: May 2020

Various poly(vinyl alcohol)-based gels are known for a long time and they are related to the gel materials of significant scientific and applied interests. Among different poly(vinyl alcohol) (PVA) hydrogels those formed via the so-called cryotropic gelation approach, i.e. PVA cryogels, attract special attention owing to, firstly, simplicity of their preparation and, secondly, very good properties of such matrices. The aim of this work was to compare the physicomechanical properties of PVA cryogels formed from the urea-containing aqueous and dimethylsolfoxide solutions of the polymer. It was shown that not only the solution’s nature influences greatly on the properties of the resultant cryogels, but also the low-molecule additives in the initial polymer solutions lead to the opposite effect in cryogels characteristics. The results of our investigation can expend the area of PVA cryogels usage in many fields.
Development of optimal formulations of natural alloyed cast irons for metals and engineering, and thermal timing subjected to secondary treatment by the method of resonance-intermittent refining
Authors: Lubyanoi D A , Yu Shevchenko S , Lubyanoi D D , Markidonov A V , Zvarych E B
Published: May 2020

This article presents the results of the introduction of resonant-pulsed refining technology in production, which made it possible to change the microstructure of blast-furnace irons and significantly increase the operational stability of molds and pallets.
Distribution of impurities in ceramics based on zirconium nitride obtained using the oxidative constructing approach
Authors: Kovalev I A , Shevtsov S V , Vorkachev K G , Ashmarin A A , Shokodko A V , Ogarkov A I , Ovsyannikov N A , Kochanov G P , Tenishev A V , Kazakova V N , Shornikov D P , Shokodko E A , Strelnikova S S , Chernyavskii A S , Solntsev K A
Published: May 2020

The localization of impurity phases in ceramics created by direct nitridation of zirconium rolled metal was established. For ceramics synthesized at temperatures above the melting point of the metal, the impurity phases are localized along grain boundaries and at macrodefects. In a composite heterostructure of the composition ZrN –(ZrN
x/α
--solid solution of nitrogen in metal/ZrN
x
) – ZrN, impurity phases are predominantly localized in an α-solid solution of nitrogen with their subsequent displacement to grain boundaries and macrodefects at the end of the nitridization process.
Investigation of the influence LiF sintering additive on the properties of magnesium aluminate spinel ceramics
Authors: Senina M O , Lemeshev D O , Pedchenko M S
Published: May 2020

Annotation

The relevance of developing a technology for creating transparent ceramics based on magnesium aluminate spinel is considered. The spinel precursor was obtained by the reverse coprecipitation method. The effect of the phase composition of spinel powder and sintering additive on the properties of ceramics is shown.
Elementoxanealumoxanes – modifiers of silicon carbide ceramic composites components
Authors: Shcherbakova G I , Storozhenko P A , Apukhtina T L , Kh Blokhina M , Zhigalov D V , Novokovskaya E A , Varfolomeev M S , Titov D D , Ashmarin A A
Published: May 2020

Pre-ceramic organoelementoxanealumoxane oligomers whose pyrolysis results in oxide ceramics of multicomponent composition: aluminum yttrium (xY2O3·yAl2O3), yttrium aluminum silicate (xY2O3·yAl2O3·zSiO2), yttrium aluminum magnesium (xY2O3·yAl2O3·zMgO) ones, are modifiers of silicon carbide based composite materials that increase their resistance to high temperature oxidation.
Mass-transfer kinetics, structure, and tribological properties of coatings deposited on steel in Ar or N2+O2 by electro-spark alloying using Cr3C2-NiAl electrodes
Authors: Kiryukhantsev-Korneev Ph V , Sytchenko A D , Gorshkov V A , Levashov E A
Published: May 2020

Multicomponent coatings were obtained by electro-spark alloying using Cr3C2-NiAl electrodes, in air and in argon medium at direct and opposite polarity. Cr3C2-NiAl electrodes were manufactured by self-propagating high temperature synthesis. Mass transfer kinetics was determined by gravimetric method. The structure and composition of the coatings were evaluated by scanning electron microscopy and energy-dispersive analysis methods. Friction coefficient was measured using pin-on-disk test. Roughness parameters and wear tracks were studied by optical profilometry. It was found that the opposite polarity in combination with a protective environment is optimal in terms of growth rate, structure and tribological properties. The coatings obtained by the best regime had a relatively low roughness (Ra=4 jm), high wear resistance and a low friction coefficient at the level of 0.18.
Structure Of The Al85Ni7Fe4La4 Polycrystalline Alloy After Complex Impacts Of Deformation And Flash Lamp Annealing
Authors: Bakhteeva N D , Todorova E V , Kannykin S V
Published: May 2020

On polycrystalline alloy Al85Ni7Fe4La4 the effectiveness of complex processing was shown, including intensive plastic deformation (IPD) by shear under pressure and flash lamp annealing (FLA), to improve the strength characteristics of cast aluminum alloys.
Influence of gallium oxide concentration on the properties of transparent ceramics based on magnesium aluminate spinel
Authors: Ulyanova A V , Senina M O , Lemeshev D O
Published: May 2020

Annotation

The article deals with the preparation precursor of magnesium aluminate spinel by the method of inverse co-precipitation, as well as the study of effect of firing temperature and the concentration of the gallium oxide addition on the optical and ceramic properties of the products is shown.
Corrosion resistance of nonnickel shape memory alloy
Authors: Nasakina E O , Sudarchikova M A , Tsareva A M , Sergiyenko K V , Konushkin S V , Kaplan M A , Balashov E P , Sevost’yanov M A
Published: May 2020

Corrosion resistance of a Ti - (20-30) Nb - 5Zr shape memory alloy were studied. The structure and composition of the materials were determined using SEM and Auger electron spectrometry. Electro-chemical parameters and alloy dissolution in physiological modeling media were investigated. It has been shown that the alloys are quite corrosion-resistant: no dissolution and high Ebd potential were observed.
Study of products influence of rice waste liquid-phase catalytic oxidation on growth and plant development
Authors: Khvatov A V , Sevostyanov S M , Sakharov P A , Bocharnikova E A , Ph Deeva N , Son B K , Yu Aladin D , Lomakin S M , Lukanina Yu K , Yu Zherebker A , Kononikhin A S , Demin D V
Published: May 2020

A method for producing growth stimulants using liquid-phase catalytic oxidation of rice waste was tested, with an assessment of the composition of the resulting solution, active silicon, and bioassay. Laboratory studies have shown that solutions from rice waste synthesized by liquid-phase catalytic oxidation are promising for the preparation of plant growth stimulants.
Numerical solution of stress-strain state during electromechanical treatment of plasma sprayed coatings
Authors: Yu Ivannikov A
Published: May 2020

The principal aim of this study was to determine the distribution patterns of the stress-strain state at different times. The solution was performed using the finite difference method. The main results were presented depending on the time of action of the alternating electric current during the electromechanical treatment of the plasma sprayed coating.
Smart Material Serves Other Smart Materials: Comparison of Measurement of CO2 Concentration by Optical and Optoacoustic Methods
Authors: Michal Dostál , Jan Suchánek , Zdenek Zelinger , Jan Wild , Petr Bitala , Aleš Dudácek , Václav Válek , Vít Klecka , Petr Kucera , Václav Nevrlý
Published: May 2020

In this study, we compare the sensitivity of the Wavelength Modulation Spectroscopy (WMS) to the Quartz enhanced photoacoustic spectroscopy (QEPAS) method on a sample of CO2 gas at various concentrations. We show the advantages of the QEPAS method, the essential part of which is a crystalline segment made of smart material.
Identification of the causes of non-uniformity of the condensate collector metal of the main gas pipeline
Authors: Nasibullina O A , Tyusenkov A S
Published: May 2020

The complex of negative effects of hydrogen on metal, leading to destruction of metal structures, is commonly called hydrogen corrosion. The object of the study was a sample of steel A 516-55 condensate collector of the main gas pipeline, which was subjected to hydrogen stratification. The aim of the work was to establish a link between the non-uniformity of the metal and its tendency to hydrogen stratification. The work solved problems that were aimed at studying the physical and mechanical properties and microstructure of the analysed metal. X-ray fluorescence analysis was carried out to identify the causes of discontinuities within the metal. A light microscopy method was carried out to study the microstructure of the test sample taken from the focus zone of the condensate collector destruction. The microstructure was examined using the “METAM RV - 22 type EU LOMO metallographic microscope. An X-ray fluorescence analysis was carried out to determine the causes of the discontinuity within the metal. Tests were performed on a EDX-800HS spectrometer at various X-ray tube operations. It has been found that the inhomogeneities are due to the uneven distribution of manganese in the metal body.

A post-publication change was made to this article on 11 Jun 2020 to correct the pdf so that it matched the webpage.
Vibration studies of a magnetoelastic material
Authors: Minaev A Ja , Korovkin Ju V
Published: May 2020

This article contains the results of research on the vibration characteristics of elastomer samples. Experimental studies of the dynamic properties of magnetoactive elastomer materials under the action of magnetic fields on a vibration complex are conducted. A kinematic sinusoidal excitation is given on the table of the vibrator from the side of the support on the tested product. The accelerations at the sample output are recorded. Oscillograms of accelerations at the input and output of the sample under the action of a magnetic field are obtained. The range of displacement of resonant frequencies under the influence of a magnetic field is shown. The justification for creating an electromagnet lifting force that overcomes the elastic force of the test material is given. Computational modeling is performed to create an elastic deformation of a magnetoactive elastomer, both static and dynamic, using a magnetic field.
Influence of the composition of the metal-ceramic coating on wear resistance
Authors: Roshchin M N
Published: May 2020

The work is devoted to the development of a wear-resistant coating, combining the hardly compatible properties of high hardness and plasticity. The proposed composite coating has a nickel-chrome corrosion-resistant matrix, providing high plasticity, and hardening phase Al2O3, which can significantly increase the hardness of the coating and wear resistance. The use of laser radiation to melt the coating allows to crush Al2O3 grain to 0.05 … 1.0 MкM, which significantly increases the operational properties of the coating under the influence of variable loads on the friction assembly. Investigations of the frictional properties of wear-resistant coatings PG-10N-01 + 15% A1203 weld by a laser showed that when lubricated with hydraulic fluid AMg-10, the friction coefficient paired with Br.AJN 10-4-4 at a load of 5 … 40 MPa and a sliding speed of 0.05 m / s is less than with solid electrolytic chromium. Wear rate Br. AZH 10-4-4 at a load of 10 MPa and a sliding speed of 0.25 and 1.0 m / s in friction pair with coating PG-10H-01+15%A12O3 is 14 … 20 times less than in a pair with solid electrolytic chrome coated respectively. The wear-resistant coating PG-10N-01 + 15% A12O3, weld by laser, can be an alternative to replace hard electrolytic chrome plating. The developed technology for producing wear-resistant ceramic-metal coatings with an ultrafine hardening phase can be applied to create friction pairs of heavily loaded tribocouplings assemblies.

A post-publication change was made to this article on 11 Jun 2020 to correct the pdf so that it matched the webpage.
Information search subsystem for intellectual system of improvement of pressure processing processes
Authors: Byvaltsev Sergey V
Published: May 2020

The software for the information retrieval subsystem of the intelligent system for optimizing pressure processing processes was developed. The solution to the problem of finding information on the Internet comes down to finding key information. Algorithms for solving the problem and work results are presented. The advantages and disadvantages are shown in comparison with existing approaches. A program that implements a search algorithm is proposed.
Resistance law for turbulent Couette-Taylor flow and the Lambert W function
Authors: Balonishnikov Alexander , Kruchkova Julia , Opalikhina Olga
Published: May 2020

The article is focused on an application of generalized local balance turbulence model for Couette-Taylor flow. It is shown that resistance law can be expressed in terms of the Lambert W fuction. Comparison with some known experimental data are given.
A method of compensating distortion of radio signals with amplitude-phase modulation in a quadrature driver
Authors: Sherstukov S A , Buravtsova A N , Pechnikov S S
Published: May 2020

The article considers the features of spectrally effective radio signals and the principles of signal formation by differential quadrature amplitude modulation with a shift of π / 4. A method is proposed for compensating for distortion of radio signals with amplitude-phase modulation in a quadrature driver. A distortion compensation scheme is modeled, and the possibility of its application for non-linear amplification of signals with a variable envelope is considered.
The excitation spectrum in a weakly interacting bose gas
Authors: Taylanov N A , Kanokov Z , Urinov S Kh
Published: May 2020

In the work the problem of phenomenon of superfluidity is considered within the framework of Bose-Einshtein condensation, theoretically. We discuss the main features of the excitation spectrum in a weakly interacting Bose gas. Our analysis will show that the healing length, which determines the length scale below which collective phenomena are physically more relevant than free-particle-like ones. Since the weakly interacting gas of Bose particles has been mapped onto a gas of noninteracting quasiparticles, we are able to analyze the thermodynamics of the system and find how temperature affect the depletion of the condensate.
Simulation of the multi-component gas transfer through porous adsorbent in the model of competing adsorption
Authors: Bataronov I L , Selivanov V F , Semenozhenkov M V
Published: May 2020

In the framework of the competing adsorption model in the limit of strong adsorption a model of mass transfer of two-component gas through an absorbing porous body was developed. The model includes a system of two related equations. The first integral of the system is found, by which the problem is converted to a self-similar form. Two criteria relations defining the type of problem solution are established. The first of them includes the ratio of the threshold adsorption concentrations. At values of this parameter greater than 100 or less than 0.01, a pronounced displacement of one of the gas components inward the adsorbent is observed. The second parameter is proportional to the ratio of the initial concentrations of components and affects the mass of gas components absorbed by the adsorbent. Self-similar expressions are obtained for the distribution of the absorbed mass and the total absorbed mass of the gas components. For the air-titanium system, barothermal relationships of the depth of gas penetration into the adsorbent and the absorbed mass of components are calculated. It was found that for nitrogen-oxygen air mixture, the masses of absorbed nitrogen and oxygen by porous titanium practically coincide.
The effect of space weather on the ionosphere at the 15° meridian during CAWSES-II
Authors: Maltseva O , Nikitenko T
Published: May 2020

Space weather determines the ionospheric state, knowledge of which is especially important during disturbances. To study this state, the period March 7-17, 2012, recommended by SCOSTEP for detailed studies and called CAWSES-II, was selected. This period has a number of features of the behavior of the solar wind parameters SW and the interplanetary magnetic field IMF. In this paper, we study their relationship with the total electron content TEC and the critical frequency foF2 of the ionosphere at the meridian of 15°, near which several ionosondes are located. The correlation coefficients of TEC and foF2 with the SW and IMF parameters for the month and the selected period are determined. For foF2, the difference between the correlation coefficients for the month and March 7-17 is less than for TEC. The possibility of using TEC to determine foF2 was shown, since the response of foF2 to disturbances was very close to the response of TEC and the variations of TEC and foF2 have been occurring synchronously.
Technological innovations in bread production in the Arctic
Authors: Ermoshin Nikolay A , Romanchikov Sergey A
Published: May 2020

The conditions and factors determining the need to develop technological innovations for food production in the Arctic zone of the Russian Federation are considered. An innovative technology of separated cleaning and electro-hydraulic grinding of grains, electrocontact baking of bread and bakery products is proposed. The composition and principles of the combined device for grinding grain and bread production are disclosed. The principles of technological operations using technological equipment for the production of whole grain bread are formed. The directions of further research on food production, optimizing food storage are determined and recommendations are given on the food supply of the population in remote areas, as well as in emergency situations, natural disasters, and in quarantine conditions.
Modular hardware platform for the development of IoT devices implemented using multi-chip packaging technology
Authors: Kirienko D A , Lunkov P V , Putrolaynen V V , Aryashev S I , Belyaev M A
Published: May 2020

The paper presents the concept of a modular hardware platform for the development of IoT devices using the example of a system for collecting and analyzing information. Design variants of modules that implement the basic functions of IoT devices are presented: obtaining primary data and their preliminary processing, data aggregation and transmission, data analysis and storage of results. The technologies of multi-chip packaging and three-dimensional integration are presented, which can significantly reduce the size of the developed modules.
The assessment of the radio tower bearing capacity during the installation of some additional equipment
Authors: Mashtakov Alexander P , Khakimzyanov Rustam R
Published: May 2020

The article presents the assessment data that explain how the defects impact on the bearing capacity of radio tower pylons and stress and strain state of the pylons. The obtained results raise the possibility of replacing the equipment set on the radio towers with the additional equipment, including the one for solar radiation regeneration.
Equipment quality management based on a mathematical model to detail its life cycle
Authors: Savicheva Yu N , Enikeeva A A
Published: May 2020

The equipment quality management program at the production stage provides for the use of statistical information on the most characteristic conditions of equipment during its operation as initial data. In this assessment, both operational and reliability characteristics of the equipment are subject, which are the criteria for establishing mutual compliance of the conditions of its production with real operating conditions. In accordance with the foregoing, the basis for the implementation of equipment quality regulation is its failure flow of abnormally high intensity. At the same time, two particular cases of high failure rate are distinguished: as the first one, a mismatch of the production conditions of the equipment with the current technical requirements is accepted, the result of which is products with a hidden factory defect. As practice shows, it is impossible to establish its presence with high accuracy as a result of performing input control, which leads to equipment failures during operation at various operating times. The second one is the discrepancy between the production conditions of the equipment and the actual operating conditions. In this case, due to the design features, the equipment is not able to withstand typical operational loads, which causes a high failure rate.
About some automated processes in the production of dairy products
Authors: Kozub Y A , Komlatsky VI , Khoroshailo TA
Published: May 2020

When processing milk and producing dairy products, the key factor is the control of the quality indicators of milk and manufactured products using automatic control systems of SAK with the use of microprocessors and microcontrollers. When milk is taken, automated plants allow you to determine the composition and quality of milk, including the content of somatic cells, mass fat content and protein fraction. The milk storage tanks are equipped by the local automatic systems. The technological processes of milk normalization are associated with the adjustment of its parameters. The functional diagram of automatization of the milk normalization process in the flow involves the use of a microprocessor controller. The composition of the automated production area of drinking milk includes information sensors on the status of process parameters, digital instruments for monitoring process parameters. The process of producing liquid starter cultures and bacterial concentrates involves the possibility of changing the productivity of the cultivator. Automatization does not include the supply of milk to the process equipment, the transfer of equipment from one technological operation to another and many others. Further automatization of technological processes in dairy production should be based on the extensive use of robotics and flexible robotic lines.
Tests in the insulating cameras of the improved separator
Authors: Khodjiev M T , Murodov O J , Eshmurodov D D , Eshnazarov D A
Published: May 2020

The article is devoted to the study of the equipment of a cotton fibers processing plant. At the same time, an improved version of the cotton fibers Separator is recommended. The results of the enhanced separator’s experimental results are also presented. The scientific significance of the research results is justified by the development of a separator design ensuring the preservation of the initial quality indicators of cotton by protecting it from mechanical influence, as well as by developing a method for preventing obstruction during separation of cotton from air, by rational arrangement of the air chamber in the separator working chamber, and by increasing the efficiency of the separation process by establishing special guides after the inlet pipe.
The influence of the location of the cells on the allocation of weed impurities for cleaning raw cotton from fine waste
Authors: Rajavov O I , Kurbonov F A , Gappavora M A , Jumaev Sh
Published: May 2020

The article considers the influence of the movement of raw cotton in the cleaning zone with various options for the location of the grid holes. The article also provides a theoretical study of the movement of cotton on the surface of the grid. The location of the grid holes for cotton movement is recommended. The ratios of the reaction forces at impact are presented, as well as the method for calculating the angle of flight particle of cotton before hitting a multifaceted grid surface.
Method of thermal treatment of saw disk teeth of fiber-processing machines by laser quenching
Authors: Abrorov Akbar , Kuvoncheva Matluba , Rajabov Ozod , Mukhammadov Mukhsin , Jumaev Shakhrillo
Published: May 2020

The article covers the increase of hardness of the surface layer (h=25 microns) with a soft core (h=100-300 microns) of the teeth of the saw blades of the cylinders of fiber processing machines. Assigned task of hardening the surface layer of the teeth of the disc saw of the cylinder of fiber-processing machines is solved by thermal and chemical-thermal treatment of the teeth of the disc saw in a vacuum chamber by pulsed electron beams, laser processing after ion nitriding.
Study of performance criteria of experimental tumbling bodies
Authors: Lyukshin V S , Shatko D B , Strelnikov P A
Published: May 2020

Tumbling is a surface plastic deformation of loose workpieces due to their collision with a working tool in an enclosed volume when they are moved due to the rotation of the working body. Special tumbling bodies are used as a working tool for the implementation of this operation. Tumbling process performance criteria depend on many factors. Along with the type of tumbling, the adopted cutting conditions and the equipment used, the design and dimensions of tumbling bodies, as well as the materials from which these bodies are made, have a significant impact on the final result of polishing the workpieces. New designs of tumbling bodies are created with the aim of increasing the process performance, as well as improving the surface quality of workpieces. The issues related to the development and study of performance criteria of experimental tumbling bodies are reflected in the article.
Development of a flange connection model to study the effect of uneven bolt tightening forces on the stress-strain state
Authors: Tukaeva R B , Bayazitov M I , Enikeeva A A
Published: May 2020

It is shown that during the operation of technological equipment and pipelines very often there is an uneven tightening (UT) of fasteners for flange connections (FC), which can lead to an emergency. On the model of flange connection developed in the computer-aided design system “KOMPAS-3D”, the influence of UT on the stress-strain state of FC elements from the point of view of ensuring their strength was studied. The adequacy of the model was proved by comparing the stresses calculated in the PASSAT software package in accordance with GOST 34233.4-2017 with the stresses obtained by modeling the flange and bolt with a uniform tightening force. A methodology has been developed to create an uneven tightening force (TF) on the FC model. The calculation results showed that when the bolt load per bolt increases even by a factor of 1.25, the circumferential and meridional membrane stresses in the FC increase, respectively, by 2.5 and 3.3 times, which can cause FC depressurization or impair its strength. It is necessary to continue research with other parameters of loading and structural design of the FC in order to determine the most dangerous combinations and recommend continuous monitoring of TF during operation.
Loading of satellite bearing of planetary cycloid gear by forces acting in meshing
Authors: Tchufistov E A , Tchufistov O E
Published: May 2020

The main feature of planetary cycloid gears is the multi-pair contact of the pin-rollers and teeth of the cycloidal disk. To establish liaisons in the gear, mathematical models of the satellite’s force interaction with pin-rollers are used. The dependences of the total forces in meshing, which occur under the action of a torque applied to the output shaft, from the gear parameters, clearances in gear and the relative position of gear elements are given. The results of calculations performed in Mathcad using the proposed model show how the forces change in the direction of the inter-axis line of gear with increasing clearances at a constant torque on the output shaft. This solution allows estimating the forces acting on the satellite bearings at the specified manufacturing accuracy at the design stage of the gear.
Factor analysis in the lame problem (the problem of composite cylinders)
Authors: Kremyansky Vladislav F , Klasner Georgy G , Yaroslavtsev Daniel I
Published: May 2020

The article considers one of the important directions in the repair of cars. The examples discussed relate to the case where the holding force must ensure that the additional element is stationary in the axial direction. This is the case, for example, when restoring cylinder liners, when there are no forces and moments that tend to rotate the additional element in the enclosing part. The probabilistic formulation of the composite cylinder problem described above is also fully applicable to the calculation of these compounds.
The use of the planetary differential in the mechanisms of energy recovery
Authors: Barbashov N N , Abdullina L R , Ilyushkov I N , Bolotov I E
Published: May 2020

The paper assesses the possibility of using planetary differential variators to change the gear ratio of the kinematic control chain of a flywheel accumulator. The possibility of using a differential mechanism as a variator for the flywheel battery drive is related to the calculation of the required power for the transmission ratio control. The equation of the power in the engagement of central wheels with the satellite was derived as a ratio of the power ratio. The obtained ratios of speeds and capacities of the differential mechanism allowed us to prove that the flywheel accumulator can be used without being included in the control system, by using the property of self-leveling the kinetic energy of the links of the planetary differential variator.
The path planning method for anthropomorphic manipulator for avoidance an obstacle approximated by a parallelepiped
Authors: Petrenko V I , Tebueva F B , Antonov V O , Gurchinsky M M , Zavolokina U V
Published: May 2020

There are various methods of planning paths for anthropomorphic manipulators that allow to bypass the obstacle and to work in real time. One of these methods was developed by the authors for circumventing an obstacle, which was approximated by a sphere. The approximation by a sphere of elongated obstacles overstates their size that leads to an excessive length of the path of avoiding the obstacle. The developed method combines analytical and numerical solutions with relatively low computational complexity, allowing it to work in real time. The effectiveness of the method is illustrated by a numerical example. The trajectory of the anthropomorphic manipulator required for its movement can be obtained using the existing methods of generating a trajectory based on the path of movement calculated using the proposed method. The developed method can be implemented in the systems of intellectual or supervisory control by anthropomorphic manipulators.
Digital solution to the problem of flow control in mechanical engineering production
Authors: Prozhogina T V , Provotorov V V , Borisoglebskaya L N , Zaslavskiy A A
Published: May 2020

Industrial Internet of Things is widely used to solve the industrial automation problem. This concept is aimed at the interaction of controlling computers and industrial equipment. The main problem is considered the development of algorithms for this interaction. Host computers have programs, based on these algorithms. M2M sensors are used as a feedback system to make management decisions during the operation. A condition for the successful implementation of IIoT is the standardization of machine-readable codes and unified data exchange protocols. The criteria for the development of algorithms is the economic efficiency. Optimal algorithms of the digital interaction in subdivision of mechanical engineering production are proposed in this article.
Low pass anti-alias filter for ADC with differential input on base Op-Amp with differential output with a minimum number of capacitors
Authors: Denisenko D Yu , Prokopenko N N , Butyrlagin N V
Published: May 2020

The new circuit of third order low-pass filter (LPF) on operational amplifier (Op-Amp) with differential output designed to limit the spectrum of signals at the input of an analog-to-digital converter (ADC) is presented. The developed circuit contains one capacitor less than in classical LPF. The basic equations of the new circuit are presented and the results of computer simulation obtained in Micro-Cap CAD, which based on models of THS4130 Op-Amp by Texas Instruments, are shown. The results of computer simulation confirm the efficiency of this LPF scheme and show a close to ideal correspondence between the theoretical and real amplitude-frequency response.
Simulation of partial oxidation of natural gas in a resource-saving reactor mixer
Authors: Bazhin V Yu , Trushnikov V E , Suslov A P
Published: May 2020

Modern industrial methods of producing hydrogen almost exclusively use fossil fuels, like natural gas, crude oil or coal, as raw materials. Methods such as steam reforming or partial steam oxidation to produce hydrogen from fossil hydrocarbons. This process chemically separates the carbon which is then converted to carbon monoxide (CO). These methods of hydrogen extraction are not ideal to actively protect the climate. There is currently a certain shortage of hydrogen in any refinery, so an additional source of hydrogen needed to stabilize the process. The work presents the results of simulating the processes in the homogeneous zone of the mixer and simulating the process of converting methane in the catalyst bed of the mine reactor using natural gas to produce hydrogen.
Review of modern software complexes and digital twin concept for forecasting emergency situations in oil and gas industry
Authors: Abdrakhmanova K N , Fedosov A V , Idrisova K R , Abdrakhmanov N Kh , Valeeva R R
Published: May 2020

Technological processes complication leads to increase of accidents scale, this negatively affects people, environment and enterprise. In this regard, there is a need for good risk management, taking into account real state of a hazardous production facility. In this paperwork, is analyzed application of hazard analysis method “Tree of consequences”. The method is widely used for industrial safety of oil and gas facilities. The paper also provides an overview of some software systems that allow to visualize steps of risks analysis and to minimize calculation process based on 3D modeling. In oil and gas industry the FLACS software tool is used to simulate most well-known ignition and toxic emission scenarios in terrestrial conditions. It is possible to assess effect of hazardous or harmful substances on production facility in domestic TOXI-Risk software package. Phast Lite program is used to simulate consequences of accidents with ability to create danger in entire sequence of events from accident itself to damage. In addition, the article defines digital twin concept. The digital twin provides constant interaction and data exchange with a real object. This technology is promising for production management, for maintenance and for accidents prevention.
The digital twin technology and its role in manufacturing
Authors: Magomadov V S
Published: May 2020

One of the most notable technologies of the fourth industrial revolution (also referred to as Industry 4.0) is considered to be a technology known as a “digital twin”. This technology is particularly useful in the context of manufacturing and the main focus of this paper is the use of this technology in this area. In this paper, it is explained what a digital twin is and a couple of different definitions are covered. Then, this technology is compared to some other emerging technologies of Industry 4.0 and the main differences and similarities are discussed. Finally, the business value of the digital twin is discussed.
Research of efficiency of influence of ultrasonic treatment on asphalt and paraffin oil deposits
Authors: Palaev A G , Dzhemilev E R
Published: May 2020

In the oil and gas industry, asphalt and paraffin oil deposits generated in process equipment, tanks and pipelines are a major problem. Their accumulation in the flow section and tanks leads to a sharp decrease in the level of productivity of the entire system. Currently, many methods are used to delete asphalt-resin and paraffin oil deposits. These methods are mainly based on thermochemical methods, the use of which involves high costs and an increase in the level of danger of the works carried out. This paper discusses the ultrasonic effect on asphalt and paraffin oil deposits in order to melt them and, as a result, better removal. This method is sufficiently effective, safe, simple and environmentally friendly to be used in manufacturing processes.
Visualization of metalworking processes in the development of simulation programs for equipment with numerical control
Authors: Yurov A N , Chizhov M I , Bredikhin A V , Lavlinskiy V V
Published: May 2020

The article proposes the concept and implementation of soft-ware solutions that allow to present milling and turning processes. The software simulates metal-looping using a pre-created control program in G-code. Software products based on the use of functional capabilities of the open Cascade geometric core allow not only to visualize the processes of milling and machining, but also to transfer models with the results of processing through export formats to other CAD systems.
Fault-tolerant nondestructive control of the stress-strain state of the load-bearing elements of pantograph lifts
Authors: Kalinichenko V S , Vlasov Yu A
Published: May 2020

This paper proposes a method of fault-tolerant nondestructive control of the stress-strain state of the load-bearing elements of lift and transportation machines, considered on the example of a prototype of pantograph-type lifts. The basic requirements for the load-bearing elements of lift and transportation machines are analyzed. An experimental research technique has been developed including tensometric and thermal nondestructive testing methods. A full-scale experiment of a prototype pantograph-type lifts is shown.
Assignment of dimensional accuracy parameters of parts during assembly of aircraft repair engines
Authors: Grachev I A , Bolotov M A , Kudashov E V , Pechenin V A
Published: May 2020

The article considers the existing models and methods of analysis and synthesis of geometric tolerances of products with assembly dimensional chains. There proposed a method to define the rational tolerances for the linear dimensions of parts during assembly of aircraft repair engines. The developed methodology is based on the use of computer simulation technology for assembling the assemblies with actual geometry, and a model for calculating the labor input and cost of parts manufacturing based on the assigned tolerances. The main advantages of the technique are considered by the example of assigning rational tolerances to the parts of the repair rotor of a high-pressure compressor, which have the greatest influence on the functional characteristics of the aircraft engine. The results of the relationship between the dimensional accuracy parameters of parts and assembly parameters are presented, and the dependence of the cost of refinement or manufacturing of the part on the assigned tolerance is obtained.
Empirical modeling of cutting force from technological factors in hard turning of 105WCr6 steel
Authors: Rastorguev D A , Sevastyanov A A
Published: May 2020

The article is devoted to the mechanical load determination on process constants during hard turning of 105WCr6 instrumental steel. The work contains the results of three-factor laboratory experiment on end face turning. The blanks were rings, hardened to a hardness of 55 HRC. Their outer diameter was about 50 mm. During the experiment, the basic process parameters, namely cutting modes, were varied. Semiproducts were turned on a Russian CNC lathe modification 16B16T1C1. The system includes integrated diagnostic subsystem with encoders and current sensors. These sensors allowed using indirect method for mechanical loads assessment. To mathematically explain the force level statistical methods are used. They were linear regression for exponential formula and decision trees. The results of the mathematical investigation and the future review of the studied correlations are given. The results are compared with previously developed machine learning models.
Low temperature and radiation resistant JFET differential amplifiers circuits synthesis with increased common-mode rejection ratio
Authors: Prokopenko N N , Pakhomov I V , Zhuk A A
Published: May 2020

We have had limits for transfer ratios of adder ∑1, when there are increased values of common-mode rejection ratio, for general function circuit of classic two stage JFET of differential amplifiers, including input differential stage and adder ∑1 output currents differential stage. We have considered three particular variants to synthesize differential amplifiers practical circuits based on current mirrors, folded cascodes and floating complementary differential stage. We have shown that differential amplifiers of floating complementary differential stage subclass is the most advanced to construct low noise analog circuits to process signals of sensors, operating in severe operating conditions (at low temperatures, initial radiation). Proposed circuit solutions are recommended for silicon and GaAs JFET technologies (including JFet, CJFet, CBiCJFet).
Hydrostatic supports in test and measuring equipment
Authors: Strok L V , Sekatsky V S , Merzlikina N V , Pikalov Yu A , Kaposhko I A
Published: May 2020

The relevance and advantages of hydrostatic supports in test and measuring equipment are shown. Structural and operational features are given when using hydrostatic supports as hydrostatic guides in vibration bars, vibration systems and measuring devices, ensuring minimum friction and smooth movement. The use of spherical hydrostatic bearings in ball joints allowing to create high-frequency pulse systems is shown. Examples of application of hydrostatic bearings in actuators, drives and spindle assemblies of test and measuring equipment are given.
Development of a mathematical model and analysis of the receiver for emergency alerts in a mine
Authors: Kudinov D S , Maikov O A , Kokhonkova E A , Potylitsyn V S
Published: May 2020

The article presents the scientific and methodological approaches to the principles of construction and justification of the characteristics of a new sample of the SDV radio channel in underground mines to assess the required sensitivity of the receiving equipment and the maximum range of the channel. Based on the estimates obtained, as well as using radio engineering methods for calculating communication systems, the principles of noise reduction are formulated, coding and modulation systems are selected and justified. Mathematical modeling of noise reduction processes was carried out and algorithms and programs for the receiving and transmitting paths of a wireless data transmission system through rocks were developed. The paper presents the results of field observations of noise recorded in a working mine for the extraction of non-ferrous metals.
Engineering and manufacturing methodology of multi-robots collaboration model synthesis
Authors: Gurjanov A V , Shukalov A V , Zakoldaev D A , Zharinov I O
Published: May 2020

The theoretical problem of the synthesis methodology for the collaboration of multi-robot facilities is investigated. The analysis is presented and the basic hardware and software of multi-robot facilities are determined. Multi-robotic industry can be implemented within the intelligent mechatronic systems (IRS). A methodology has been developed and procedures for technical collaboration of the intelligent robotic components of the multi-robotic industry have been defined. The emerging technologies of collaboration between IRS are determined. The analysis is presented and the results are determined for each intelligent robotic component of the engineering and manufacturing mechatronic facilities. The function and specialization of each IRS resources for the implementation of the multi-robotic reliable facilities is determined.
Study of the impact of the life cycle of aircraft engines on the strategy of an engineering enterprise
Authors: Tikhonov Alexey
Published: May 2020

The article explores the relationship between the life cycles of aircraft engines / engineering plants / aircraft engine industry with various strategies based on organic and material approaches. The analysis of the characteristics of the life cycle stages of aircraft engines that affect the performance of an innovation - active enterprise (a part of the United Engine Corporation (UEC)) is presented. The basic toolkit has been studied, which allows to competently and reasonably form the relationship of the life cycles of an aircraft engine / enterprise / of UEC with strategies to ensure the stable functioning of the organization.
Methods of decomposition of Boolean functions
Authors: Gdanskiy N I , Denisov A A , Rysin M L
Published: May 2020

The article considers on of the main types of Boolean functions conversion – their decomposition. The decomposition is being used in many applications for studying and designing complex objects and systems with logical methods. Firstly, the article observes decomposition of Boolean functions represented in the truth table. Among traditional decomposition approaches, the article describes formulas presented by Boole and Shannon and special methods of orthonormal expansions. Then, the paper considers contemporary decomposition techniques and their classification. Next, the article discusses representation of Boolean functions in normal forms and essential features of that representation, important for decomposition. After that, the article reviews decomposition techniques for boolean functions represented in conjunctive normal forms (CNF). The study mentions CNF partitioning as hypergraph partitioning. Then the paper discusses applications generating large CNFs. Minimization of large CNFs with traditional methods is impossible. Their minimization is possible only using decomposition techniques. The separate class of tasks is minimization of Horn formulas. Finally, at the conclusion, the study discusses decomposition for parallelization of SAT problem.
Formation of a model of information technology platform for the development of foreign trade potential as the basis for the technological development of engineering enterprises
Authors: Belyakova Galina , Belyakov Sergey , Fokina Darya , Shpak Anastasiya
Published: May 2020

The research focused on formation of the model of information technology platform for development foreign trade potential among machine builders as the basis for the technological development of engineering enterprises, and the studding tasks and main components of an information technology platform. Formed model should take into account not only the trends and socio-economic level of development of states with different living and economic conditions, but also the specifics of machine-building enterprises and the features of their products. It is necessary to form a model of special information technology platform for in machine-building enterprises, taking into account integration features and transformational modernization of industry enterprises.