bluuebunny/crossref_metadata_2025 huggingface dataset:
Development the engineering analysis system of mechanical processing technology and assembly for the parts like axially symmetrical bodies
Authors: Masyagin V B , Bazhenov R I , Primak D D
Published: January 2020

The problem of developing an engineering analysis system for modeling technological processes of machining and assembly and carrying out dimensional analysis has been considered. The purpose of creating the system, the tasks was formulated, the objects was selected. The general principles of the system design, the data structure, the software, and functioning of the engineering analysis system of mechanical processing technology and assembly has been proposed. Software modules allow you to perform modeling procedures for technological processes of machining and assembly, dimensional analysis of structures and technological processes of machining, products visualization, parts, workpiece, technological processes of machining and assembly. The system functioning is possible in the analysis modes of existing technological processes and synthesis of new technological processes of machining and assembly. A set of techniques, mathematical models, algorithms underlie of system building has been listed. It is noted that the developed system of engineering analysis provides an increase the efficiency of products design and technological processes of machining and assembly in terms of ensuring accuracy. The possible directions of further development of the system has been indicated.
Revisiting the adjustable mode of a locomotive startup to ensure the best use of the clutch
Authors: Keropyan A M , Babichev Yu Ye , Sizin P Ye
Published: January 2020

It is known that a locomotive startup process usually consists of two consecutive phases (initial and final). From the point of view of the adhesive force implementation, it is important how the driving force changes during each of the startup phases and what the length of each phase is. The law of distribution of the realized values of the adhesion coefficient and the use of adhesive force depend on the law of change in the startup driving force we use to approach the limit of adhesion. The choice of the startup mode can be crucial in the most heavy-duty mode of the locomotive – when starting-up and setting the train in operation. As a result of the conducted research, it was established that immediately after the motion onset, acceleration should not exceed 0.5% of the maximum possible for these conditions. It means that in the first sampling interval (up to approximately 5% of the starting duration), the driving effort must be sufficiently small, namely, F = 0,005·Fmax. Then, it must slowly increase to about 15–20% of the starting duration over each sampling interval. It is established that in the startup mode with the proposed step-by-step method of controlling the driving force, the speed of the locomotive almost completely coincides with its corresponding speed during continuous adjustment. Deviation makes up not more than 2-3%. It can be explained by the inertia of the wheelset drive of the locomotive, which will not lead to clutch stalling and wheel slipping.
Three-dimensional of modeling microgeometry of contact pairs in technical systems
Authors: Bykov L , Ezhov A
Published: January 2020

In this work, the technique of numerical simulation of the characteristics of contact pairs in technical systems is considered. The technique is based on the use of microgeometry parameters of the contacting surfaces. Based on the measurements of the surface roughness profile, the microgeometry parameters of the surfaces are determined. The technique described in the article allows to obtain a clear picture of the actual contact spots formation of the contacting surfaces, the size and volume of the intercontact area, the distribution of fields of equivalent stresses and temperatures in the contact pair.
Eigenfrequency spectrum analysis of bending vibrations for naturally swirled rod
Authors: Pavlov V P , Kudoyarova V M , Nusratullina L R
Published: January 2020

The paper presents a numerical method for calculation of eigenfrequency vibration for naturally twisted rod considered as a first approximation model of a real blade of a gas turbine engine (GTE). The proposed method is based on the method of a fifth-degree spline developed by the authors. This method makes possible to solve fourth-order differential equations very accurately that arising in problems of transverse vibrations of rods. These research are focused on studying the more complex vibration process of a rod's spatial bending unlike the known works where bending vibrations are considered only in a single plane.
Reduction of quantization error in position encoders
Authors: Liberman Y L
Published: January 2020

The paper describes estimate of the quantization error of a real position encoder taking into account the factors specified above, and the method of minimization of this error by an additional adjustment of the scale is proposed.
Final and element modeling of workpiece temperature at the combined grinding
Authors: Gusev Vladimir G , Morozov Alexey V , Sobolkova Elizabeth V
Published: January 2020

The combined grinding is characterized by simultaneous preliminary and final machining of workpiece on one machine tool without replacement a coarse-grained on a fine-grained grinding wheel, that allows to reduce the main and auxiliary time for performance of technological operation, and, therefore, to increase grinding process productivity. Entry and boundary conditions of computer modeling of the maximum temperature of the processed surface at the combined and traditional grinding are defined. Modeling of surface temperature is carried out in the modern Solid Works software product for simultaneous grinding by wheels with various characteristic of abrasive material, what in scientific-technical literature was not considered earlier. Models of the maximum temperature of the processed surface in a function of removed overmeasure, longitudinal and cross-feed of workpiece, on the basis of which the cutting regime of the combined flat peripheral grinding, providing elimination of thermal damage of the processed blanket, is appointed are established.
Improving the performance properties of titanium alloy VT6 after ion implantation with copper and aluminum ions
Authors: Ovchinnikov V V , Lukyanenko E V , Yakutina S V
Published: January 2020

The objective of this work was to study the processes occurring on the surface of VT6 titanium alloy samples when implanting with copper and aluminum ions. Elemental composition, structural-phase state, mechanical and tribological properties of VT6 titanium alloy surface layers modified by aluminum and copper ions was being researched. As can be seen from the undertaken studies, the mode of high-intensity ion-implantation process makes it possible to obtain ion doped surface layers of VT6 alloy containing finely dispersed intermetallic phases and a solid solution of aluminum and copper in titanium of a composition varying in depth. The thickness of the ion-doped layer, the average grain size of the intermetallic phases and their conglomerates increases with the increase in implantation dose while aluminum implantation is in progress. It has been shown that the implantation of aluminum and copper ions into VT6 alloy leads to a considerable increase in its microhardness and wearability. Based on the research results, a conclusion on the positive effect of a structural-phase state of ion-doped titanium layers on their mechanical and tribological properties of VT6 titanium alloy has been drawn.
The structural and texture analysis of titanium alloy Ti-6Al-4V samples obtained by direct metal deposition
Authors: Scvortsova S V , German M A , Grushin I A
Published: January 2020

The paper presents the results of structure and texture formation study in Ti-6Al-4V alloy samples, obtained by Direct Metal Deposition technology of additive manufacturing. The effect of annealing on the formation of the structure and texture in 3D-samples was investigated. It is shown that the samples have a two-phase structure of “basket weaving” in the initial state and after annealing. It is established that the samples have significant anisotropy of properties in two mutually perpendicular directions that could be explained by the presence of the crystallographic texture.
The correlation among chemical composition, structure and mechanical properties in titanium alloys for the elements with increased dynamic ability
Authors: Gvozdeva O N , Shalin A V , Stepushin A S
Published: January 2020

This article contains the comparison of physical and mechanical properties of several titanium alloys. The chemical composition influence on mechanical properties is investigated. VT22I and VT35 highly alloyed titanium alloys are the most prominent materials for armor elements production with ultimate tensile strength of 1200-1400 MPa and impact strength of 0,25-0,3 MJ/m2.
Development of simulation model for the site of mining and transportation of ore of the mining and processing plant
Authors: Aksyonov K A , Stepanova I V , Aksyonova O P
Published: January 2020

This paper presents the results of simulation modeling of the mining and transportation of ore at a mining and processing plant. A hybrid multi agent-simulation approach is used to analyze the bottlenecks of the simulated process.
Basic approaches to programming by demonstration for an anthropomorphic robot
Authors: Alchakov V , Kramar V , Larionenko A
Published: January 2020

The article is devoted to the consideration of the issue of building intelligent control of manipulators of an anthropomorphic robot. The paper considers the approach of transmitting data when building management through training with a teacher using a copying suit. The structure of the knowledge base for building management has been considered. The proposed approach is an effective alternative to building control through solving complex systems of differential and finite-difference equations of a high order, which do not always take into account all the features of the functioning of manipulators in various environments.
Modification of the cement stone active silm of urban treatment facilities
Authors: Romanenko I I , Romanenko M I , Petrovnina I N
Published: January 2020

The use of recycled sludge from wastewater and products based on it in concrete is caused by an increase in the production of activated sludge in cities of millions and the restriction of free land for its disposal. The main components of activated sludge and fiber are SiO2, CaO, Al2O3, Fe2O3, MgO and P2O5, which allow the pozzolanic mechanism to manifest itself in a hardening cement matrix. Thus, activated sludge and fiber can be used as a modifier of the structure of hardening concrete. The use of municipal wastewater treatment plants in the production of building materials reduces the cost of waste disposal, social tension and solve problems related to environmental protection.
Method of studying the dynamics of the controlled mechanical continuously variable transmission with an elastic element and one-way clutch.
Authors: Derzhansky V B , Cherepanov S V , Volkov A A
Published: January 2020

In comparison with other types of transmissions currently used, mechanical continuously variable transmissions are capable of providing significant technical and economic advantages, which makes research in this area relevant. This paper presents a mechanical and mathematical method that allows for studying the dynamic processes that take place during operating a controlled mechanical continuously variable transmission with an elastic element and a one-way clutch which provides for transmitting torque to the driven shaft in one direction only.
Structural accommodation by twinning of copper during severe plastic deformation
Authors: Rogachev S , Zemlyakova N
Published: January 2020

The influence of severe plastic deformation on structure and physical and mechanical properties of pure copper was investigated. The copper was in its initial state after 2, 4, and 8 passes of equal channel angular pressing (ECAP). We used electron microscopy, X-ray analysis and electrical conductivity technique. The transformation of macrocrystalline structure under ECAP is a result of deformation twinning under the action of partial dislocations. It was found that the refinement of the initial deformation macro-twin of 200 μm to a deformation micro-twin of 240 nm occurs during ECAP without the development of dynamic recrystallization process and is accompanied by an increase in microhardness.
Methodology for designing optimal internal grinding cycles resistant to varying processing conditions
Authors: Akintseva A V , Prokhorov A V , Omelchenko S V
Published: January 2020

In this article the design methodology of optimal control cycles of radial and axial feeds by the example of internal grinding operations is considered. The methodology is based on the functional interrelation between main technological parameters of machining (cutting modes, cutting zone geometry, physical mechanical properties of machining material, wheel blunting and its characteristic) and cutting forces, processes occurring in the machining zone. Dynamic programming method was used as mathematical optimization method. Principal time (task of operating speed) was used as objective function. For stability augmentation of product-quality index the test of objective function limitations was made for two groups of machining conditions (favorable and unfavorable).
Generalized cutting force model for grinding
Authors: Yudin Sergey , Smolyanoy Kirill , Pereverzev Pavel
Published: January 2020

In CNC grinding operations different surfaces are processed with various types of grinding. Model of cutting force is necessarily used in cutting modes calculating. However, it's impossible to use partial empirical dependences of cutting force for automating of cutting modes calculation because they do not cover all normative space of grinding conditions and are not intended for use in the calculation of automatic CNC grinding cycles. Therefore analytical wide-range models of cutting forces for different types of grinding are needed, but these models should be designed on the basis of common idea of kinematics and physics of metal removal processes. The article proposes the method of obtaining cutting force models for different grinding types, obtained from a generalized analytical wide-range cutting force model, as particular cases for a given grinding type. Generalized model of cutting force is obtained on the basis of fundamental regularities of mechanics of metal' plastic deformation by wheel grains in a cutting zone, kinematic of cutting process by abrasive grains under conditions of temperature and speed parameters during grinding, functionally related with cutting modes, geometrical parameters of a contact zone between a wheel and a workpiece, structural behaviors of processed material, wheel grains blunting.
Damper for mobile installation of oil sludge pyrolysis
Authors: Mazidullin D N , Zubairov S G , Bairamgulov A S
Published: January 2020

The article discusses the main types of dampers used in modern industry, their advantages and disadvantages. The reasons for their inefficient work on the mobile installation of pyrolysis of oil sludge. A new design of the collet elastomer type damper is proposed.
Eigenvibrations of an elastic bar with mechanical resonator
Authors: Samsonov A A , Korosteleva D M , Solov’ev S I
Published: January 2020

The differential eigenvalue problem governing eigenvibrations of an elastic bar with fixed first end and mechanical resonator attached to second end is investigated. This problem has an increasing sequence of positive simple eigenvalues with limit point at infinity. To the sequence of eigenvalues, there corresponds a complete orthonormal system of eigenfunctions. We introduce limit differential eigenvalue problems and derive the convergence of the eigenvalues and eigenfunctions of the initial problem to the corresponding eigenvalues and eigenfunctions of the limit problems as a resonator parameter tending to infinity. The original differential eigenvalue problem is approximated by the finite difference method on a uniform mesh. Error estimates for approximate eigenvalues and eigenfunctions are established. Theoretical results are illustrated by numerical experiments for model problems. Investigations of this paper can be generalized for the cases of more complicated and important problems on eigenvibrations of beams, plates and shells with attached resonators.
Analysis of the reliability and efficiency of the technical system with preemptive recovery of a component
Authors: Obzherin Yuriy E , Boyko Elena G , Fedorenko Sergey N
Published: January 2020

One of the methods to improve the reliability and efficiency of technical systems is preemptive recovery, which allows to reduce the effects of system failures. The article discusses the semi-Markov model for monitoring latent failures of a technical system, taking into account preemptive recovery for the remaining time until the next latent failure. The characteristics of the reliability and efficiency of the system are found. The results can be used to assess the effectiveness of the use of preemptive recovery.
Kinematic analysis of the deflecting mechanism for pulsed filler wire in MIG/MAG welding
Authors: Bulychev V V , Golubina S A
Published: January 2020

The article deals with the features of the functioning and design of combined mechanisms of the deflecting type for pulsed feeding of filler wire in MIG/MAG processes. The formulas allowing to determine the kinematic parameters of the filler wire supply depending on the geometric parameters of the designed mechanism are obtained.
Increase of durability of an amphibious vehicle water jet propulsion drive
Authors: Nenashev Pavel , Abdulov Sergey , Taratorkin Alexander
Published: January 2020

The analysis results of dynamic loading of the amphibious vehicle’ water jet drive are presented, the hypothesis about the durability limitation of the drive due to the onset of resonance forced and parametric oscillations is advanced. Solutions of that problem are justified.
The study of the complex thread knurling process
Authors: Antsupov A V , Fedulov A A , Yurchenko S V
Published: January 2020

The study carried out to research a manufacturing process of long products for mining industry by a method of cold knurling, in particular, on a stud of a self-drilling bolt used for strengthening of mountain rocks. The solution of the task was obtained by mathematical simulation of the knurling process in the FE software package that allows establishing stress-strain state parameters necessary to analyze forming and loading of the process. According to the R&D carried out on a basis of the two-rolled screw thread rolling machine was developed a technological process for which the knurling rollers were design and created. The manufactured pilot batch of items that’s meeting the requirements for such type of anchors speaks of capability to maintain low-series production of self-drilling fasteners based on the complex profile cold knurling method of a long billet.
Analytical evaluation of materials wear resistance and tribotechnical coupling resource
Authors: Antsupov Alexander V , Antsupov Alexey V , Slobodianskii M G
Published: January 2020

When predicting the durability of various friction units at the design stage of the machine, an experimental-analytical standard of wear resistance is used. Its definition requires long-term and expensive experimental studies of samples or full-scale analogs. In order to reduce these costs, in this work, the fundamental theoretical dependences are derived for evaluating the wear resistance and the life of tribocoupling operating in stationary conditions of friction and fatigue wear. The basis for building the desired dependencies is a thermodynamic analysis of the steady-state process of friction, as a dual, molecular-mechanical process. The verification of the obtained theoretical dependences was carried out by comparing the calculated and experimental values of the wear resistance of samples abraded by the FCM-1 friction commercial machine according to the standard “steel roller - cast iron pad” under various conditions of friction interaction. The obtained results showed a fairly high adequacy of analytical dependencies. The proposed equations can be used to calculate the expected life of various tribocoupling at the design development stage of machines or their reconstruction.
Residual welding stresses evaluation in the typical platform element of amphibious all-terrain vehicle by ultrasonic method
Authors: Kurashkin K V , Mishakin V V , Gonchar A V
Published: January 2020

As part of solutions development for the technical diagnosis of the amphibious all-terrain vehicle platform, evaluation of residual stresses in a typical welded joint of the frame was carried out by the acoustic birefringence technique. The significant residual stresses were observed after welding, the largest in the heat affected zone. The intricate distribution of the residual stresses due to the complex boundary conditions was obtained. The state of the material was estimated using the hypothesis of maximum shear stress. The difference of the principal stresses was compared with the yield stress.
Adjusting of polar crane running gear at the corporate customer site
Authors: Pimshin Y I , Demidenko A S , Pimshin I Y
Published: January 2020

The article discusses the issues of adjustment of polar cranes at the customer site. It shows that the defining characteristics when adjusting the movement of the crane around the circumference are the geometric parameters of the running gear. It is noted that the repair-fit geometry of the bridge and the running gear of the crane corresponds to its non-stressed state. The non-stressed state of the crane characterizes the condition under which the deformations in its structural elements are absent or minimal. This crane position is achieved by installing it on the track in the middle between the two limiting states that are predetermined. It is emphasized that defects are eliminated exclusively in the running gear of the crane in the process of adjustment. Errors made in the process of manufacturing and installation are compensated during the crane adjustment. It is noted it refers to all errors made in the manufacture of structural elements as well as those made directly during their installation, and non-standard gaps in the moving parts of the crane determining their backlash.
Dynamic analysis of elementary differential gear with rigid links
Authors: Slobodyanik T M , Balakhnina E E
Published: January 2020

At present the machine dynamics investigations are conducted in the next directions: dynamic processes research in special machines; research of the machines which links are solids; research of mechanisms representing a combinations of a solids and elastic systems. In this paper the elementary differential gear with rigid links dynamics is investigated. A number of dynamic problems can be solved accurately enough without taking into account the loaded element elasticity. Research of dynamic processes of one degree of freedom mechanisms are quite fully published in scientific literature, which cannot be said about mechanisms that have two degrees of freedom. In this paper are compiled and solved the movement equations for differential mechanism with two degrees of freedom. Mechanism has two degrees of mobility, therefore, the position of all its links is determined by two generalized coordinates. The mechanism movement is described by two Lagrange equations of II kind. Rotation angles of the drive and driven shafts are taken as generalized coordinates. System of differential equations of the second order relativ generalized coordinates is compiled. All coefficients of this system can be calculated in advance. Joint solution of equations of the system makes it possible to determine the angular accelerations of the two main links. Equations for determining angular velocities and angular accelerations of drive and driven shafts are recieved.
Design development of technological complex for friction welding of thin-walled products made of armlen
Authors: Nemtinov V , Sergeev V , Nemtinova Yu
Published: January 2020

In this paper, we present the results of engineering design of a technological complex for friction welding of thin-walled products from armlen. We have also analyzed welding methods for plastic details. The main technological parameters of friction welding are: relative speed of welded surfaces rotation or linear velocity of the planes relative to each other; melting pressure for creating of a friction force; heating time; sediment pressure; cooling time of the weld. Each of these parameters depends on the material type and the shape of welded surfaces, assuming that absolutely flat surfaces are considered, since flatness does not strongly affect these parameters for thin-wall products. Further, welding technology of thin-walled parts from mineral-filled polypropylene (armlen) is offered, calculations of technological parameters of welding process are carried out and an electronic model of the complex is developed. On the basis of the electronic model and drawings, a prototype of the technological complex was made. Approbation of the complex on the example of gas-proof boxes production showed its high efficiency and prospects of its use for the whole class of thin-walled products from armlen.
Designing a duplicate model of the GTE turbine blade casting process
Authors: Vdovin R A
Published: January 2020

The work describes the results of developing a duplicate model of the gas turbine engine blade casting process. The work was based on the development of the digital “furnace-flask-filler-mould-metal-stopper” process system considering the geometrical, structural and thermophysical specifications of the turbine blade casting process. The industrial approbation of the developed process under the experimental production conditions exemplified by the manufacture of the GTE turbine moving blades demonstrated a 3- to 4-fold decrease in time of the blade blank manufacturing cycle due to the virtual multi-iteration optimization of the process.
Mechanized installation for molding of wood-concrete panels
Authors: Nikitina I P , Polyakov A N , Utkin I A
Published: January 2020

The article presents new technical solutions aimed at improving the performance of the installation for the molding of wood-concrete slabs. Calculation and design of rotary wheel racks which provide movement of installation in two mutually perpendicular directions is made; the proportioning bunker; conveyor that distributes and discharges the ready mortar into the formwork with two pneumatic cylinders; frames of plate forming installation. The study of the frames of plate forming installation, proportioning bunker and conveyor. Engineering analysis was carried out in CAE system ANSYS. Engineering analysis included five types of calculations: calculation of stiffness with rigid and elastic grip conditions, modal analysis, dynamic calculation, thermal and thermal-deformation calculations. The obtained results of the engineering analysis allowed us to conclude that the deformation of the frames is insignificant, that is, their rigidity provides the required accuracy of the manufacture of plates and the accuracy of the position of the proportioning bunker relative to the conveyors. The carried out measures on modernization of plate forming installation provided increase in productivity approximately in 2 times.
Experimental and theoretical research of a hot condition of the T–100–130 steam turbine
Authors: Kudinov I V , Tkachev V K , Tarabrina T B , Klebleev R M
Published: January 2020

Based on thermal profiling of the cylinder of a high pressure cylinder (HPC) of T–100–130 stream turbine detailed researched has been performed to study its temperature conditions during startup. Using experimental data about the temperature condition of an external surface of the cylinder, by way of solving the inverse problem of heat conductivity the average heat transfer coefficients have been determined during the period of startup on its internal surface (on the steam side). At the same time, approximated analytical solution of the heat conductivity problem has been applied for the cylinder’s two-layered insulation (thermal insulation – metal wall). Using the data of experimental and theoretical research thermal stresses have been identified in the cylinder wall, as well as the stresses due to the effect of steam pressure forces. It has been shown that in certain profiles of the turbine cylinder stresses are able to exceed the ultimate stress limit for that material. Using experimental data about the changes in certain parameters (temperature differential for the top- and bottom sections of the cylinder, differential in the shaft- and cylinder extension, vibration indicators, etc.) a theoretical method has been developed for forecasting their changes during a certain time interval as measured from the time of current measurement.
Integrated approach to process design of manufacturing of high-precision products
Authors: Nazaryev A , Bochkarev P , Reshetnikova E
Published: January 2020

In the present paper considers the structure of the complex design procedures (integrated approach) of the system for taking into account the requirements for the assembly of high-precision products in the design of manufacturing methods of machining, which is based on the establishment of a link between the process design of machining and assembly plants, is considered. Also, the paper considers mathematical models and approaches to system ware implementation.
Theoretical justification of the type of a flat-cutting working body of a ploughshare
Authors: Belousov S V , Samurganov E E , Rodionenko A I
Published: January 2020

The work is dealt with main tillage, namely the theoretical substantiation of the type of a flat-cutting working body of a ploughshare. The article has a research character, which is expressed in the fact that there were given the theoretical analysis of the method of manufacturing working bodies of a similar profile for ploughshares with different widths. Also, there was justified the type of a proposed design, its description and flow of technological process were given. As a result of the work done, there was obtained the theoretical dependence of justification of the shape of a flat-cutting working body of a ploughshare. The conclusions show the main results achieved so far.
Failure features of laminated materials under static and cyclic loading
Authors: Kamantsev Ivan , Kuznetsov Aleksei
Published: January 2020

The paper discusses the behavior of a hot-rolled laminated metal material under cyclic loading according to the three-point bend and uniaxial static tension scheme. It is shown that the creation of a gradient structure provides increased resistance to the fatigue cracks growth while the propagation of a fatigue crack does not cause interlayer delamination, and the effect of retardation is realized until the crack tip reaches the interface of the layers. Under the conditions of static tension, the laminated material obtained by hot batch rolling has an increased ductility, and delamination along the interfaces occurs as a result of the formation of a neck and, as a result, a change in the stress state in the plastic deformation zone.
Formation of a narrow hard layer in the AlMg6 alloy near the contact surface after extrusion through a conical die
Authors: Smirnova E O , Smirnov A S , Alexandrov S E
Published: January 2020

A technique for determining the thickness of a deformed layer obtained at the contact with a rough deforming tool is verified by means of kinetic indentation. The AMg6 aluminum alloy is investigated after extrusion through a conical die with a semi-angle of 1.5°. The analysis of the experimental data has shown the existence of a 200 μm deformed layer near the contact surface.
Effect of nanosized oxide fillers on the adhesive strength of epoxy lacquer under scratching
Authors: Smirnov S V , Veretennikova I A , Konovalov D A
Published: January 2020

The paper reports on the results of a comparative study of the adhesive strength of coatings made of unfilled epoxy lacquer and lacquers filled with nanosized TiO2, SiO2, and ZnO oxides, which have been obtained in scratch testing experiments. The coatings are applied onto an aluminum-magnesium alloy base. The value of specific elastic energy per unit area of the cohesion boundary is used as the measure of adhesion. Scratch testing is performed with conical Rockwell indenters on an attachment to a Zwick 2.5 testing machine. The coating modified with silicon dioxide proves to have the highest resistance to adhesive failure under local action among all the studied coatings based on epoxy lacquer.
Uneven degradation of the material during the operation of turdine blades
Authors: Tsareva I N , Berdnik O B , Kirikov S V , Krivina L A
Published: January 2020

Turbine rotor blades operate under the action of centrifugal forces, which create height-varying stresses. The temperature field of the blades is also inhomogeneous, and the value of its gradient depends on the flow parameters and the geometric dimensions of the blades. In the process of manufacturing and quality control of completed turbine rotor blades, the manufacturer uses the generally accepted state standards to determine the condition during long-term operation. It is assumed that the material of the blades should be uniform all over the volume so that the manufacturer proposes analyzing mainly the blade root. In this case, mechanical tests are carried out on large samples and the results provide only averaged data on the state of the material. Life prediction based on the results of mechanical tests can lead to a mistaken overestimation of service life. This is because this approach takes into account only the state of the internal zones of the material. However, the rupture of material occurs on the surface and in the more thermally stressed parts like the trailing edge or leading edge. As a consequence, the application of this approach is unacceptable for blades with long operating time.
Design features of the steering control systems of road trains and articulated buses
Authors: Chudakov O I , Gorelov V A
Published: January 2020

One of the important properties of road transport vehicles is maneuverability, which directly affects the performance and safety of transportation, as well as the total cost of freight and passenger traffic. The paper discusses the design features of various steering control systems and their effect on the maneuverability of vehicles.
Modeling of heat and mass transfer processes in cooling towers and structure optimizing of polymer filler
Authors: Afanasenko V G , Kulakov P A , Galimova Yu L , Sidorkin D I
Published: January 2020

The closed water recycling systems with the main element being the evaporative water cooling devices or cooling towers are used to cool the main equipment of industrial enterprises. During these processes the recycled water is being polluted and lost, therefore it is necessary periodically provide this water volume from natural sources. Improving the efficiency of cooling towers can reduce the negative factors of such systems’ operation. This article presents the researchof the aerodynamic characteristics of heat-and-mass exchange packs of cooling towers made of vertical polymer pipes. The design of the optimized cooling tower filler unit is described and recommendations for improving the efficiency of evaporative cooling process of the circulating water are given.
Investigation of the effect of elastic-plastic loading modes in the manufacture of metal flywheels on their performance properties
Authors: Berezhnoi D V , Sachenkov A A , Xu Yingqian
Published: January 2020

The work introduces the so-called “true” deformations, i.e. for final deformations, three deformations of elongations and three components of shear deformations are taken as a measure of deformations. The so-called generalized stresses, referred to the units of the corresponding areas before the deformation of the body, and “true” stresses, referred to the units of the corresponding areas after the deformation of the body, are introduced into consideration. Based on the constructed relationships, an algorithm for solving the variational problem of the three-dimensional theory of elasticity is constructed, and a finite-element method for solving the problems of deforming elastoplastic structures is developed and implemented. The practical problem of deforming the pre-stressed kinetic energy storage has been solved.
Numerical modeling of concrete deformation processes during its interaction with reinforcement
Authors: Berezhnoi D V , Laalai Faicel , Sekaeva L R
Published: January 2020

The aim of the work is to propose a numerical model of the interaction of reinforcement with concrete in order to be able to simulate the operation of structures of building and transport facilities. In the course of the study, the authors carried out a numerical simulation of the processes of deformation of concrete during its interaction with reinforcement; a model was implemented based on linear connections with finite rigidity. The results of the calculation were compared with the experimental data, the dependence “pulling force - reinforcement slipping relative to concrete” was constructed.
Assessment of the influence of the surface modification process on the wear intensity in the operation of internal combustion engines loaded parts
Authors: Akhtulov Alexey , Dadayan Sergey , Edigarov Vyacheslav
Published: January 2020

The regularities of the influence of material surface layer parameters on the wear resistance of the rubbing surface of machines and equipment engine parts during operation are considered. The methods of wear intensity assessment for choosing the best constructive solutions of the aggregates and the optimal surface treatment of friction parts are proposed. The results of electromechanical treatment of friction surfaces of steel parts with the preliminary application of a thin antifriction layer of various solid lubricants on the surface of the workpiece, which improves the structure of the surface layer and increase performance, especially wear resistance and antifriction properties are shown.
Influence of joule heat and heat of electric arc on the vortex flow in DC arc furnace
Authors: Kazak O V , Starodumov I O
Published: January 2020

The paper devoted to the numerical simulation of processes in DC electric arc furnaces with the bottom electrode. These furnaces have shown higher efficiency, low heat loss, lower components wear and higher quality of steel production. The biggest disadvantage of such furnaces is a high rate of fettle wear near the bottom electrode that connected with electrovortex flow. Electrovortex flows appearing under electromagnetic forces as a result of non-homogeneous distribution of the current density through the liquid conductor. This effect can be observed in many technological processes: electro slag remelting process (including DC and AC metallurgical furnaces, electrolysis cells and submerged-resistor induction furnaces), arc welding, processes of semiconductor crystals growing, electro vortex engines etc.
Dynamics and strength of planetary gear with elements of increased flexibility at transient modes
Authors: Plekhanov F I , Pushkarev I A , Pushkareva T A
Published: January 2020

The increased flexibility of links and details of planetary gear allows to reduce unevenness of load in gear meshing. On the other hand, the probability of emergence of vibrations increases. For the analysis of dynamics and strength of planetary gear during running-up the system of nine differential equations received earlier is used. For lowering of degree of a system a number of assumptions is accepted. The most part of deformations, in view of smallness, and the related elastic forces, are not considered. In the generalized forces the following power factors are left: torques of the engine and forces of useful resistance; elastic forces in axles of satellites. The system is reduced to two equations: vibrations of a satellite axle and rotation of a sun gearwheel. Dependences of natural frequencies of vibrations of satellite axle on gear parameters are received. It is considered the constant and variable torques of driving forces. Proceeding from satellite axle strength of bending, dependences between extreme value of the driving torque and rotary speed of a sun gearwheel and mass and dimensional characteristics of planetary gear are set.
Modelling of dynamic processes in an elastic base with a heterogeneous coating
Authors: Belyak Olga , Suvorova Tatiana
Published: January 2020

In this paper, we consider a mathematical model describing the dynamic properties of heterogeneous materials having a non-uniform layered structure in the form of a non-uniform elastic coating with a microstructure lying on an elastic base. The dispersion function for a two-layer composite medium is given, showing that the heterogeneous coating of an elastic half-space significantly changes the dynamics of the medium.
Simulation of the temperature distribution in semi-finished products of combined abrasive tools during their microwave heating
Authors: Sapunov V V , Vetkasov N I
Published: January 2020

When producing of the abrasive tool using one of the most reliable operations is the thermal processing operation. Heating nonuniformity during the thermal processing adversely affects the quality of the abrasive tool and can lead to it being rejected. In this paper there are computational simulation results of the heating process of semi-finished products of combined abrasive tools in the microwave field presented and recommendations on the uniformity improvement of the temperature distribution along the whole volume of the heating object are provided.
To the problem of the methodology for evaluating the effectiveness of the use of superplasticizers in concretes
Authors: Nesvetaev Grigory , Koryanova Yuliya , Korchagin Igor
Published: January 2020

Based on the analysis of the effect of various superplasticizers on the compressive and tensile strengths of concrete hardened under different conditions for three months, it was concluded that to estimate the effectiveness of superplasticizers it is not enough to compare the relative strength indicators of concrete only (f90/f28; ft = f(f); f = f(W/C)) without taking into account the effect of the superplasticizer on the water content in the concrete mix and the cement content. The assessment methodology is given. It is shown that provided the required design parameters for durability are ensured, analysis of only data on the increase in compressive and tensile strengths in time can lead to erroneous conclusions. A reliable assessment should be made taking into account the influence of the superplasticizer on the composition and cost of the concrete mix, shrinkage, creep and E-modulus of concrete.
Development of international cooperation in power engineering
Authors: Savon I , Vorontsova O , Chernenko O
Published: January 2020

The article is devoted to the consideration of the processes of development and deepening of international production and sales cooperation and specialization in power engineering. A prerequisite for this is the formation of large production groups for the production of power equipment for power plants in Russia, which are intensively expanding international production.
Technological aspects of state regulation of the development of power engineering
Authors: Chernenko O , Savon I , Isik L
Published: January 2020

The article discusses the reasons for the unsatisfactory state of the technical, technological and sectoral structure of power engineering. The importance of power engineering as the most important branch of the domestic industry, providing the release of high-tech equipment for various types of power plants and industrial energy, is substantiated. It is revealed that ensuring timely progressive transformations in this industry is the most important task of state regulation of the economy.
Increasing the activity of cements during mechanical activation of raw materials
Authors: Krivoborodov Yury
Published: January 2020

The article is devoted to the study of the influence of dispersion of raw mixtbres on the properties of Portland cement clinker. The study established that the mechanical activation of raw mixtures by hydrodynamic effects significantly accelerates the processes of mineral formation during the synthesis of clinkers. In this case the microstructure and phase composition of clinkers changes. Clinkers from activated mixtures are characterized by clear crystallization of minerals, their uniform distribution and increased content of the alite phase. This determines the high mechanical strength of cements based on these clinkers. At the use mechanical activation of waste it is possible to obtain high level activity one.
Organization of a virtual enterprise in information systems
Authors: Bondarchuk Evgenii , Feofanov Alexander , Grishina Tat’jana
Published: January 2020

To date, the current issue in the global economy is its digital transformation. Modern digital technology in the process and product activities of the company implies the introduction of CALS-technologies, PLM, MES, ERP systems, and the interaction between agents opens the possibility of creating a virtual enterprise. The main difficulties are in the non-digital culture of enterprises, in the conservatism of people, their desire to preserve the status quo. The task of creating optimal organizational structures and a CALS system can only be solved under the conditions of a specific virtual enterprise.
Improvement of ironing technology in restoring and hardening worn out car parts
Authors: Ageeva E V , Altukhov A Yu , Novikov A N
Published: January 2020

Currently, active research is being conducted in Russia and abroad to study the so-called composite electroplating coatings (CEC). The promise of this method lies in the fact that by introducing special additives into the electrolyte, which are usually fine powder, coatings can be obtained with properties unattainable with ordinary electrolytes. For the introduction into the electrolyte, as a hardening additive, it is recommended to use powders obtained by the method of electroerosive dispersion. The process of obtaining powder materials by the method of electroerosion dispersion differs favorably with the possibility of obtaining powders even from particularly hard and refractory materials. In the case of grinding material with this method, the only important criterion is the electrical conductivity of the material being ground. Worn parts and other scrap can be used as feedstock during the process. The purpose of the study is to improve the technology of restoring worn automotive parts with composite electroplated coatings due to the use of electroerosive powders as a hardening phase. Due to the study of samples of the used powder, as well as the study of the properties of the deposited coatings on modern devices, results were obtained showing the high potential of this recovery method. It has been established that even a small addition of EDM powder to the electrolyte (5 g/l) allows to improve the performance of the deposited coating.
Structural phase changes during deformation of FeCo-V alloys by torsion under high pressure
Authors: Glezer A M , Luzgin D V , Muradimova L F , Shirshikov S O , Libman M A , Schetinin I V , Perov N S , Dyakonov D L , Sundeyev R V
Published: January 2020

The effects of high pressure torsion at 77 and 295 K on the phase composition of soft magnetic alloys (FeCo)100-xVx(x = 0 - 6.0) were studied by X-ray structure analysis, transmission electron microscopy and magnetometry. It was established that HPT leads to the suppression of excess γ-phase in alloys containing 3.0–6.0% V. It was concluded that the observed effect was a consequence of the martensitic transformation γ→α, due to deformation, along the lines of TRIP effect. It was established that suppression of the paramagnetic γ-phase leads to a noticeable increase in the specific magnetism of saturation.