bluuebunny/crossref_metadata_2025 huggingface dataset:
Extended object model for grinding operation
Authors: Vladetskaya E A
Published: January 2020

The article discusses the issues of building a dynamic model of a flat grinding operation, taking into account the statistical characteristics of the disturbances. Deviations of the shape of the grinding wheel in a static mode are random in nature and, when analyzing the processing process, can be taken into account by introducing an additional link into the system - the corresponding shaping filter. Such a filter can be built on the basis of profile analysis for any particular grinding wheel with a representation of the effect on the system in the state space as equations of state and observation. On the basis of the developed model for grinding operations in floating workshops, it is possible to use high-precision CNC machines equipped with adaptive control systems based on optimal systems with a stochastic process controller.
Prediction trajectory of the fracture crack using the photoelasticity method
Authors: Shron L B , Bogutski V B , Tabolin I S , Yagyayev E E
Published: January 2020

This paper proposes a method for projecting the propagation of a fillet-weld fracture. The model is based on photoelasticity testing of stress-strain state combined with destructive testing the fracturing resistance of fillet welds. The paper identifies the correlation of weld geometry and stress concentration/gradients. It shows that reconfiguring the flat body and/or reorienting the resultant external-load vector disrupts the symmetry in general, including the stress tensor field in the vicinity of the fracture apex. To project fracture propagation, this research uses differential geometry, in particular the properties of geodesic lines and gradient descent.
Monitoring of dynamic processes in the machining of parts with vibrations
Authors: Levchenko Elena , Pokintelitsa Nikolay
Published: January 2020

There are the results of theoretical researches for the control of dynamics of the part motion in machining of parts with vibrations, based on the use of a group of magnetic modulation sensors, allowing to measure the nature of changes and motion of the part, as well as the amplitude, frequency and acceleration of motion during machining.
Thermophysical processes in thermofriction working of surfaces
Authors: Pokintelitsa Nikolay , Levchenko Elena
Published: January 2020

There are results of thermophysical processes of thermofrictional working of details by the disk tool. Results of mathematical modeling of heat distribution in a processing zone at thermofrictional working of details are presented. It is found that the size of Q2 heat quantity going to the cutting disk in unit of time has the considerable impact on firmness of a disk, and the quantity of Q2 heat cutting going to the cutting disk under various conditions can make up to 50-60% of all warmth of cutting.
Influence of the tool working surface state on evaluation of the forming filter parameters
Authors: Bratan S M
Published: January 2020

The article presents the relations for calculation of grinding tool surface state characteristics. Such relations should be taken into account when constructing forming filters for estimating the dynamic parameters of technological systems when machining parts by grinding.
Assessment of the actual depth of cutting with cylindrical external grinding
Authors: Roshchupkin S I , Sidorov D E , Kolesov A G
Published: January 2020

Article presents the correlations that make it possible to use the results of measurements of coordinates in the process of machining a part in order to build estimates of the actual depth of cut while machining the part. Such estimates are optimal assuming the gaussianity of the noise of measurements and excitations, and can be used directly to solve process control problems.
Assessment of climatic processability of polymeric materials used in the repair of machines in the Arctic
Authors: Konoplin Alexander , Baurova Natalia , Abrakov Sergei
Published: January 2020

The results of studies of the properties of polymer composite materials that can be used in the repair of machines under conditions of constant, prolonged exposure to negative temperatures (Arctic conditions) are presented. The main indicators of technological effectiveness in the repair of machines under conditions of constant exposure to negative temperatures using polymer composite materials are evaluated. The qualitative and quantitative indicators of the technological effectiveness of polymer composite materials used in the repair of machines are also evaluated. To assess the technological effectiveness of repair materials, a qualitative criteria is suggested - an integral coefficient that takes into account the errors in the performance of each technological operation.
Development of adaptive anti-slipping spike for vehicle tires
Authors: Voiku I P , Sergeeva T V , Maltsev P N , Strikunov A V
Published: January 2020

The article describes the purpose of anti-slipping spikes, which are set into tire treads of vehicles. The advantages and disadvantages of using anti-slipping spikes are revealed. The assessment of the destructive effect of the use of anti-slipping spikes on the road surface is given. The inability to simultaneously solve the problems to ensure maximum adhesion of the vehicle’s wheel to the road surface and to minimize the destructive effect of anti-slipping spikes on this surface actualize the development of an adaptive anti-slipping spike. Unlike traditional anti-slipping spikes, the pin of the designed device is retractable. The article presents the variants of the design of the developed adaptive anti-slipping spike for vehicle tires.
Constructive solutions for upgrading of the drive of processing equipment
Authors: Bardovsky A D , Gerasimova A A , Basyrov I I
Published: January 2020

This paper presents the results of studies to assess the efficient use of the equipment with flexible thrust coupling used as working bodies. Such mechanisms are known as wave mechanisms, where the transformation of motion is carried out due to the deformation of the flexible link. A number of constructive diagrams of wave gears and the kinematics of the movement of their working bodies were analyzed in the work. On the basis of an asymmetric diagram of the motion law of flexible coupling, the basic design of an inertial conveyor with a spring tab has been developed by equation.
Determination of temperature conditions for steel plate rolling at Vyksa Steel Works (AO VMZ)
Authors: Gerasimova A , Mishedchenko O , Devyatiarova V
Published: January 2020

This article describes the working process of OMK Heavy Plate Mill 5000. Based on the fabricator's facilities capability, the technological production flow diagram of thick steel sheets of K60 (X 70) grades, for cold-working large diameter pipes has been developed. As the initial blank authors used a 310×2.100×3.170 mm plate slab. The controlled rolling process, described in the article, consists of two stages –roughing-down (when deformation and re-crystallization results in obtaining fine uniform austenite grains) and finishing rolling (when austenite is hammer-hardened and converted into fine-grain ferrite). As a result of the research has been selected and the optimal temperature conditions for rolling in the passes, which would reduce the waste of metal in furnace.
Investigation and prediction of adhesion strength of plasma coatings by mathematical modeling of deposition parameters
Authors: Zhachkin S Yu , Trifonov G I , Pen’kov N A
Published: January 2020

In this paper, studies were conducted in the field of adhesive strength of plasma coatings and the surface of the part. The propagation of a crack front in a plasma coating material with composite inclusions is simulated. It was proposed to consider the possibility of introducing into the composition of the material sputtering additional composite inclusions that have a greater plasticity and a size greater than the size of the particles in the coating.
The increased stability of a coarse-grained and ultrafine-grained Ti49.15Ni50.85 shape memory alloy achieved with multiple martensitic transformations
Authors: Churakova A A , Gunderov D V
Published: January 2020

The influence of thermal cycling in the temperature range of B2-B19’ martensitic transformations on the TiNi alloy structure and properties are studied. The level of properties, obtained as a result of mechanical tests and measurements of microhardness, obtained in the process of thermal cycling, remains stable during soaking at room temperature in the TiNi alloy.
Numerical modeling of heat transfer at cooling a high-temperature steel cylinder by the flow of a water-air medium with account taken of the gamma - alpha transformation
Authors: Makarov S S , Lipanov A M , Makhneva T M , Makarova E V
Published: January 2020

Based on the mathematical model of the conjugate heat transfer from a steel cylinder to a water-air medium, the results of the calculation of the cooling rate and the mass fraction of the α-phase in supercooled austenite during the γ → α transformation are obtained. To find the mass fraction of the α-phase in austenite during supercooling, a modified Kolmogorov – Johnson – Mel – Avrami equation is used. The calculation results have been obtained during the cooling of the high-temperature metal cylinder by the laminar gas-liquid flow in an annular channel with account taken of vaporization in the liquid. The regulation of the heat and mass transfer balance of the system during the vaporization is based on the energy model of the heat balance and is performed using the effective thermophysical parameters of the cooling medium. The mathematical model is presented in a two-dimensional non-stationary formulation taking into account the symmetry of the cooling medium flow relative to the longitudinal vertical axis of the cylinder. To solve the system of differential equations, the control volume method is used. The parameters of the cooling medium flow are calculated using an algorithm SIMPLE. For the iterative solution of the system of linear algebraic equations, the methods of Gauss-Seidel and under-relaxation are used. The calculations, are carried out using a grid with a condensing profile at the «metal cylinder – liquid» and «liquid - outer metal ring» boundaries on the liquid side and the metal side.
Increase of grinding wheel durability
Authors: Korotkov Aleksandr , Korotkov Vitaliy
Published: January 2020

The durability of grinding wheels on epoxy resin and bakelite bond reinforced with fiberglass and carbon fiber meshes was investigated. The durability of wheels was evaluated by means of their destruction due to the action of centrifugal forces during rotation in the test armored chamber. It was discovered that the speed of destruction of carbon reinforced wheels is 30% higher than the speed of destruction of fiberglass reinforced wheels. This kind of increase in the durability of the wheels allows to increase their maximum working speed, reduce tool wear, increase processing productivity, reduce roughness of the machined surfaces and the temperature during grinding.
The Resistance of a Single Protrusion at a constant current
Authors: Lyuminarskaja E S , Lyuminarsky S E , Lyuminarsky I E
Published: January 2020

The article deals with a method for measuring resistance of a single spherical asperity. There is obtained an approximate analytical relation between the electrical resistance of a single bump constriction and the contact spot radius, conductor radius, asperity height and width. Electrical resistance is determined from the solution to the Laplace equation for electrical field potential inside a conductor. The calculations are made using the finite-element method.
To determination of removable material during grinding with flap wheels after shot peen forming
Authors: Koltsov V P , Vinh Le Tri , Rakitskaya V B
Published: January 2020

Shot peening are widely used in forming the long panels and sheaths. Due to impact of shot on the processed surface, the specific microgeometry is formed, the characteristic feature of this microgeometry are the numerous dimples of shot with different diameters and depths. The presence of these dimples causes deterioration of the surface roughness parameters. Therefore, after shot peening the mandatory requirement is implementation of grinding with flap wheels for partial removal of the shot dimples, the depth of which in magnitude significantly exceeds the valleys of micro-irregularities formed as a result of previous treatment. The value of the assigned allowance for grinding depends on the requirements for the quality of the surface of the part. As a result of grinding on the treated surface, a new microrelief is formed in the form of a combination of traces of the impact of abrasive grains of flap wheels and the remains of the dimples from shot peening. At the same time, the depth of dimples of shot after grinding is much reater than the values of valleys of the micro-surface formed as a result of impact of the grains of flap wheels. Since the dimples have a spherical shape with a much larger radius of curvature than their depth, they have a special effect on the volume of the removed metal with an increase in the size of the allowance.
Microcontroller-based electromechanical drive
Authors: Selivanov K V , Vasiliev I A , Lyuminarskaja E S
Published: January 2020

This paper covers design and implementation of automated electromechanical drives for solar panels. It substantiates the need for using these devices when ensuring highly efficient generation of electricity from renewable energy sources (RES) is required and when human participation in the deployment of the device is impossible. The paper also considers the possibilities of increasing the efficiency of mobile solar power stations due to their automatic positioning during deployment and tracking the motion of the Sun in the sky through automatic control by the microcontroller-based electric drive directed by the incoming signals of the maximum irradiance tracking. The results of experimental tests of the developed microcontroller-based electromechanical drive are presented.
Methodology for the development of computer-aided design of technological equipment for chemical plants
Authors: Mokrozub V G , Karpushkin S V , Malygin E N
Published: January 2020

Design of multi-assortment chemical production (MCP) is a difficult task, the solution of which is carried out using the decomposition of the initial problem into a number of interrelated local subtasks that form a tree of tasks. The task tree defines the structure of the object-oriented component of the computer-aided design (CAD) system. The proposed methodology for developing CAD software is based on MCP procedural design model, information models that describe the structure of information necessary to solve local subtasks, information support for storing and processing information models.
Failure risks of mine excavators in ranking control levels
Authors: Velikanov V S , Dyorina N V , Panfilova O R , Dyorina K S
Published: January 2020

The paper gives the analyses of various approaches to the definition of the risk concept. The theory of catastrophes is determined to use the term “risk” in order to describe accidents and natural disasters, the theory of reliability interprets this concept as the probability of failure. It is established that there is a variety of factors that are the cause of of mining excavators failures as complex technical systems. The authors propose to establish causal relationships between the occurrence of career excavator failures, for example, using the method of event trees (failure trees) or Ishikawa diagrams.
Determination of the possible causes factors of the functionality impairment of the career excavator
Authors: Velikanov V S , Dyorina N V , Panfilova O R , Zalavina T Y
Published: January 2020

The paper deals with the factors of the possible reasons for the deterioration of the functional characteristics of a career crawler excavator, identifying such factors as “machine - career excavator”, “personnel – excavator drivers”, “materials” and “external environment” as well as secondary causes, main aspects of these factors. The reasons for the failures of the career excavator stick in the conditions of the ore deposits of the Southern Urals are established. It is shown that the greatest number of failures is associated with excavator drivers’ low qualifications and insufficient experience.
The method for achievement of group interchangeability accuracy for multilink dimension chains with gaps
Authors: Shilyaev Sergey , Slashchev Evgeniy , Mikhaylov Yuriy
Published: January 2020

The article provides recurrent dependencies for determining the upper and lower deviations of the sorting groups of the component parts of a dimensional chain calculated by the group interchangeability method for tasks when the closing link is a gap. The article also substantiates the necessity of formalizing the group interchangeability method for multilink dimension chains, which are divided into groups by the equal tolerance method. Using the sorting of parts for multilink dimension chains into groups and the assembly of parts within a group by the method for complete interchangeability, the technologist provides high accuracy, productivity and economy of production. At the same time, for multilink dimension chains, a graphical method is used to calculate the upper and lower deviations of the sorting groups. In this regard, a technique is proposed for automation, which allows formalizing the procedure for determining the parameters of a dimensional chain. At the same time, the field of application of the method expands, the requirements for the designer’s qualification reduce, and subjective errors are eliminated.
Development of methodology for the purpose of the machining process mode with time-varying parameters in the face of uncertainty of technological information
Authors: Unyanin A N , Finageev P R
Published: January 2020

In recent years, the industry is widely used new structural materials, patterns in the processing area which are not sufficiently studied, which makes it difficult to choose a rational mode of machining, largely determines the performance and quality of parts. A rational method of mode assignment is its calculation using models (dependencies) that link the output and input parameters of the process. However, the inadequacy of the models, the ambiguity of the source data and the influence of unmanaged factors may lead to the fact that the regime calculated with their use will be far from optimal. The scientific significance of the research is to solve the problem of reducing the degree of influence of uncertainty of technological information on the process of assigning machining modes with a variety of input and output parameters. In order to reduce the error in the appointment mode under uncertainty of information for the first time developed mathematical models and algorithms that provide adjustment (correction) of the parameters of the models, linking the input and output parameters of the process, according to the current information about the output parameters. Developed a plan of varying the controllable factors of the technological process, the implementation of which controllable factors closer to the optimal level. The difference between the actual and calculated values of the output parameters of the process, which is obtained during its monitoring, is used as the initial information for model correction. On the basis of models and algorithms the software is developed and efficiency of the developed methodology at appointment and correction of a mode of turning is investigated. The method and algorithm of generation of mathematical models of machining process with time-varying parameters are developed. Models take into account the mutual influence of the tool state parameters and the current processing parameters and their impact on the output parameters and allow you to calculate the output parameters of the process at different times. This makes it possible to create prerequisites for the purpose of machining mode with time-varying parameters in the face of uncertainty of technological information.
Optimization of the technological curing modes of glass fiber reinforced composites
Authors: Chen Yangyang , Maung Pyi Phyo , Malysheva G.V.
Published: January 2020

The aim of this study was to optimize the curing mode of glass fiber reinforced epoxy composites. In this article, the change of the thermos-physical characteristics of epoxy binders depending on the state of aggregation of the binders during their curing is investigated. The kinetic parameters of the epoxy binders used are determined. The obtained thermos-physical and kinetic parameters were used to simulate the process of curing fiberglass. Different modes of curing for fiberglass based on epoxy binders were simulated at different heating rates. The method of optimization of the curing mode was carried out. As the result of the calculations, it was found that the optimal mode: the heating rate in the first section 2 °C/min and in the third section 3 °C/min.
Analysis of ways and methods of deformation measuring of rigid mounted axially symmetrical device elements.
Authors: Krivov A V , Trutnev G A , Shenyatski A V , Melnikov R V
Published: January 2020

In this article some technologies of modern devices manufacturing are reviewed which are intended to achieve the needed device accuracy. The imprecision of sensing element (SE) manufacturing and different factors influencing on it are observed too. Functioning of axially symmetric non-ideal gear under high-frequency load leads to deflection of SE axis from vertical direction which is result of unbalanced mass and moments influence. Many researches were devoted to develop some methods of this disbalance evaluation. Some of them are based on theoretical approaches to disbalance elimination, but it is impossible to make it real even on contemporary technology achievements. In other researches the procedure is sufficiently simplified but it could not reach the needed accuracy of balancing. The solutions are known which allow to evaluate the deflection of SE axis under load throughout the shift of the bar free end but such processing is made not for the final stage of manufacturing. Thus the additional structural element is in the SE design. After removing this additional element the balancing of the SE could be ruined. In this article the other method of deformations evaluation in dynamics is offered when the shift caused by non-ideal SE condition needs appropriate balancing. The rigid mounting of the SE is offered, when the base end of the bar is fixed and the other end becomes free after last technological operation. The procedure of measuring of the shifts caused by unbalancing masses and moments is made through the bar mounting place. The questions of unbalancing mass and moments influence on shifts values in the sensors balance area are studied. According to the given geometry and physical and mechanical properties of sensors the best combinations of geometry and device sizes are offered with mounting area restrictions and shifts measuring kept in mind.
Analysis of the operational characteristics of the main units of BelAZ vehicles in a coal mine
Authors: Lagunova Yuliya , Bochkov Vladimir , Horoshavin Sergey
Published: January 2020

A comparative analysis of the operational characteristics of the main components of BELAZ mining vehicles has been carried out. It is shown that the choice of type and means of career transport is determined by a number of factors and, first of all, by the characteristics of the transported cargo, the distance of transportation, the scale of work and the pace of their development. The power of vehicles depends on the scale of work (freight turnover), and the pace of mining operations determines the requirements for the operational reliability of career vehicles. The dependence of the dump truck failure parameter on the service life is disclosed. The analysis of the state of metal structures of structural elements of the dump truck BELAZ-7530 based on the method of non-destructive testing is given. As a result of the analysis of thermal imaging and measurements of the thickness of the walls of the motor housing, it was established that the amount of wear depends on the heating temperature of the metal structures.
Cutting tools hardening and sharpening by fast argon and nitrogen atoms
Authors: Metel A , Nay H A , Mustafaev E
Published: January 2020

A reamer made of AISI M2 high-speed steel was heated by ions accelerated from the plasma by a bias voltage applied to it and kept at 500°C for 120 min. Microhardness of the reamer surface increased by 1.75 times and the nitride layer thickness reached 130 μm. Nevertheless, radii of the cutting edges increased by 5 times up to ~ 40 μm, which made the tool blunt. Another reamer was heated by a converging beam of fast atoms produced by an immersed in the same plasma concave grid under a negative voltage of 5 kV. Due to uniform removal of the reamer material by the beam, the radii of cutting edges decreased from the initial value ~ 8 μm down to ~ 6 μm.
Estimation and ways of mechanical efficiency upgrading of planetary rotary hydraulic machines
Authors: Volkov G Yu , Smirnov V V , Mirchuk M A
Published: January 2020

Planetary rotary hydraulic machines (PRHM) with wavelike sun wheels and floating satellite wheels have high technical characteristics but they are understudied. The article is devoted to the estimation of energy efficiency of PRHM at the stage of their projecting. Calculated formulas for the pump and hydraulic engine are offered. The comparative estimation of schemes with the numbers of waves M×N: 2×2; 3×3; 4×4; 2×4; 4×6, has shown efficiency values close to each other a little bit more than 0.9. The reserve for efficiency upgrading for the considered hydraulic machines is the use of the teeth with half-round convex-concave side surfaces.
Rounding sharp edges of machine parts with elastic polymer abrasive wheels
Authors: Dimov Yu , Podashev D
Published: January 2020

The effectiveness of elastic polymer-abrasive wheels when rounding edges has been proved. The research showed the influence of cutting speed, deformation of the tool and feed along the edge on the quality of the machined edge and the productivity of the process. Empirical equations are proposed for calculating the parameters of quality and productivity depending on the processing regime parameters.
Prediction of the insensitivity zone in the design of the feed drive CNC lathe
Authors: Denisenko A F
Published: January 2020

The processing on CNC machines of parts of a complex profile with multipass shaping schemes is accompanied by multiple changes in the direction of movement of the working bodies (reverse) during the cutting process and at idle running. When reverse, loss of information is possible due to the presence of gaps in the chain of feed drive and elastic deformations determined by constant loads overcome by the drive. Permanent loads consist of cutting forces and friction in the feed drive chain. Information loss is defined as a position insensitive zone at a position. To determine the insensitive zone, a technique is proposed that takes into account the differential accounting of friction losses in the mechanical feed drive chain. To estimate the elastic deformations in the drive chain, design schemes are proposed and analytical dependencies obtained. Differentiated consideration of friction in determining the insensitive zone allows you to outline the main ways to improve feed drives. It is shown that the magnitude of the preload on the thrust bearings and the tensile forces of the lead screw during assembly do not have a significant effect on the size of the insensitive zone. Even less impact on the dead zone has a preload change in the transfer screw-nut rolling. It was determined that the main ways to reduce the insensitivity zone is to increase the rigidity of the screw-and-nut rolling transmission anchor to the machine carriage and reduce friction in the guides. In addition, an analysis of the layout decisions of the lead screw assembly (one-sided and two-sided termination) according to the insensitive zone criterion showed that the use of one-sided termination of the lead screw is more rational.
Characteristic functions and the couples method when calculating the system
Authors: Bulyzhev Evgeny , Bogdanov Andrey , Khudobin Leonid
Published: January 2020

This paper describes the application of the couples method and of characteristic functions when calculating purification systems of cooling lubricants. There are main mathematical models for calculating the characteristic function and statistical couples described.
Digital transformation of the Bulgarian industry
Authors: Ahmedova Sibel
Published: January 2020

Information and communication technologies are the major driving force of the digital revolution in Europe and the bedrock underpinning the construction of a competitive knowledge-based economy. As a Member State of the EU, Bulgaria is pursuing a policy on the preparation and development of human, institutional and organisational capacity necessary to obtain societal and economic advancement. Adopting such a perspective, the paper aims to explore the nature of the digital economy in the context of Industry 4.0. To that end, the paper further examines the state of utilization of digital technologies in the Bulgarian industrial enterprises, which provided the basis for specific set of recommendations to be made on improving the process of digital transformation of the Bulgarian industry.
Synthesis of the suboptimal control algorithm for electroplating processes under conditions of uncertainty in the range of processed products
Authors: Solovjev D S , Solovjeva I A , Litovka Yu V
Published: January 2020

The paper discusses the main difficulties in finding the optimal control for obtaining high-quality electroplating in a rapidly changing product range. A suboptimal control search algorithm is proposed for solving this problem. This algorithm is reduced to finding the geometrically closest product to the existing ones, for which the optimal solution in the control matrix is known. The results of the suboptimal control search algorithm are given on the example of the zinc coating of a complex shaped product. Recommendations are given to improve the performance of the algorithm and the quality of the found suboptimal control.
Mathematical model of the elongated body vibrations to describe the elastic properties of the aerial vehicle
Authors: Kramar V , Volodin A , Panasenko V , Khoroshev V
Published: January 2020

The article deals with the problem of building models of oscillations of an elongated body, which, in particular, can be imagined as an aerial vehicle. The general theoretical information of the aeroelastic vibrations of the aircraft is also considered.
Technology of ion implantation of structural materials (patent life-cycle analysis)
Authors: Ovchinnikov V V , Kurbatova I A , Uchevatkina N V
Published: January 2020

The article presents a patent analysis of the life cycle of ion implantation technologies for structural materials. S-curve. In the total volume of patent documents, the Russian Federation ranks first in the number of patent documents (125). The dynamics of published patent documents in the field of technology has proved that in 2014 the number will not be reached.
Analysis effectiveness functioning urban transport system based on the duration of the movement
Authors: Poltavskaya J O , Lebedeva O A
Published: January 2020

The article deals with the analysis of the effectiveness of the functioning of the urban transport system based on the dependence of the duration of movement. An important characteristic of the quality of the system is the reliability and comfortable conditions of movement. In turn, such indicators as travel time and «buffer» indices, «buffer» time are used to assess the degree of reliability. To calculate the indicators, it is necessary to conduct studies of the modes of movement of public transport and the car-laboratory in the context of varying load on the road network. Based on the available data, functional dependencies have been established that allow determining the duration of movement of public transport depending on the duration of the car-laboratory movement. The result of the study is a developed methodology for assessing the functioning of the transport system.
Analysis of traffic flow in an urban environment based on simulation
Authors: Lebedeva O A , Poltavskaya J O
Published: January 2020

The article deals with the topic of simulation. The transport system is an important factor in the economic development of the urban environment. Its development is influenced by the condition of the roads, the intensity of road traffic, and the time costs of moving. Traffic closures have a negative impact on the quality of traffic management. To improve the efficiency of the transport system, we suggest using simulation modeling to analyze and optimize the duration of traffic. Research in the field of optimization of traffic flow Angarsk. You get that by increasing the speed by 50% the transport network does not cope with the load. The functional relationship between traffic intensity is established.
Research of dependence of wearing capacity and resource of the hardened areas of surfaces of details of construction machinery from the profile and structure of cross-section of track hardening at laser processing
Authors: Ivanov M V , Burlachenko O V , Vovko V V
Published: January 2020

The method for increasing the wearing capacity of surface layer of details of construction machinery is proposed. The features of the hardening of the surface layer during laser processing are considered. Experimental studies of dependence of wearing capacity on the profile and cross-section structure of track are shown.
Machine control systems for leveling areas for road investments
Authors: Szafranko E
Published: January 2020

Earthwork is an essential stage in road construction. The proper and efficient performance of earthwork is a necessary condition of a successful execution of a road building project. Earthwork is carried out with suitable machines and implements, which allow mechanisation and acceleration of the task. In order to fully implement these machines, control systems are employed, as these improve the accuracy of the earthwork done, enable machine operators to carry out their work more easily, and support the processing of data. This article describes automated and laser systems used for this purpose. The situation on building sites where such systems are deployed has been analysed. The article contains the results of this analysis.
Interaction of a motor unit wheel with a support base
Authors: Ovsyannikov Sergey
Published: January 2020

The problems of kinematics and mechanics of interaction of a rigid metal wheel with a deformable base on basis of the theory of instant tipping of a lever are considered. Calculated dependences are presented to determine the main indicators of interaction of the wheel with the supporting surface: strength, speed and power. It is established that rolling of the drive wheel, in comparison with the follower wheel, leads to an increase in the depth of the track, and rolling resistance force decreases in this case.
Determination of upset ingot dimensions during computer-aided forging design under fuzzy goals
Authors: Kanyukov S I , Konovalov A V , Muizemnek O Ju
Published: January 2020

The paper describes an algorithm for determining reasonable dimensions of an upset ingot during computer-aided design of shaft press-forging under fuzzy goals. Fuzzy goals related to product metal elaboration quality and the complexity of its manufacture are formulated. Objective values of a design parameter for each goal are determined. Membership functions for possible solutions corresponding to these goals and the rule of choosing the most reasonable solution are constructed. Two examples of solving the problem depending on the selected goals are given. The proposed algorithm allows one to choose the most reasonable solution from a set of feasible ones and reduces human participation in the computer-aided design process. The developed approach can be applied to solving other problems of press forging, such as choosing an ingot, determining the necessity of the billet upset operation, determining the cogged billet dimensions, etc.
Cutting data effect on machine tool vibrational state and surface roughness when machining
Authors: Aleynikov Dmitry , Lukyanov Anatoly , Savilov Andrey
Published: January 2020

The article is devoted to the study of vibration processes of metal-removal equipment. In the course of the study, the dynamic phenomena arising in the metal processing in this complex dynamic system have been investigated for the purpose of further control of cutting modes that minimize the accompanying oscillations and vibrations. This article presents the results of studying the dependence of the roughness parameters on the vibration of the spindle assembly and processing modes in the milling operation. Planning techniques and experimental statistic were used in our investigation. The dependence of vibration acceleration root-mean square parameters (RMS parameters) on cutting set modes was determined. Monitoring of vibration parameters when machining centres operating allows improving the quality of parts processing and preventing expensive machine operating under dangerous dynamic load.
Increasing power efficiency of open-pit excavators
Authors: Lukashuk O A , Komissarov A P , Letnev K Y
Published: January 2020

It is shown that a working process of rock excavation realized by an open-pit front-shovel excavator is characterized by an increased power intensity due to counteraction of its main actuating mechanisms (lifting and thrusting), whose operational parameters have to be properly matched during their joint action to provide more efficient excavation. A computational experiment allowed to determine an actual work of lifting and thrusting forces immediately involved in developing an excavated face. It was further established that power inputs depend on the bucket position relative to the working area of an excavator, and such regions of that area where those inputs are higher were determined. Differentiated calculation of the inputs was carried out, based on the type of a conducted operation – power inputs originating from excavating, from counteraction of the main mechanisms, and from lifting operational equipment parts and rock. The power intensity of excavation was estimated for various regions of the workspace of the excavator. The proposed method for calculating the power inputs of rock excavation using the operational equipment of an open-pit excavator would allow to determine an energy characteristic of the excavator for specific mining and technical conditions of operation.
Influence of the brake lining position on the efficiency of the centrifugal friction roller
Authors: Safronov Eugene V , Nosko Andrey L
Published: January 2020

Brake roller is one of the safety elements of a pallet flow rack. At present, most widely used construction of brake roller is centrifugal friction roller (CFR). Efficiency of the CFR is ability to limit speeds of a pallet with different masses in pallet flow rack, and while the lower the speed, the higher efficiency of CFR. One of the parameters that affect to CFR efficiency is frictional lining position on the brake pads of CFR, which can be define with angle of brake lining position. The article is devoted to calculation the influence of angle of a brake lining position, its operating range finding. Analytical research was conducted for the CFR prototype. It is reported that effective areas of the angles is lies closer to the boundaries of operating range and it is non-effective to install a brake lining in the middle of the operating range.
Effect of microarc oxidation regimes on corrosion resistance of coatings formed on piston aluminum alloys
Authors: Dudareva Natalia , Ustimova Elena , Enikeev Rustem
Published: January 2020

The effect of the concentration of a silicate-alkaline electrolyte and electric modes of process micro-arc oxidation on the corrosion resistance of the surfaces formed on aluminum alloys of different chemical composition was investigated. Alloys traditionally used for the manufacture of pistons of internal combustion engines (ICE) were analyzed. The corrosion resistance was investigated in solution, the composition of which to the greatest extent close to the conditions of cylinder-piston group of internal combustion engines. The corrosion resistance of the samples was estimated by the mass rate of corrosion during their exposure in corrosive solution for 144 hours. The regression equations linking the concentration values of the electrolyte and of technological modes of MAO with the corrosion rate was obtained. It is established that the conditions of the process significantly influence the corrosion resistance of the coatings. Surface treatment by the method of MAO increases a corrosion resistance by 2.9…31.9 times, depending on the sample alloy and MAO modes.
Substantiation of the trajectory planning algorithm for unmanned tracked vehicle
Authors: Derzhanskii V B , Taratorkin I A , Yakovlev A G
Published: January 2020

Mobility operation of an unmanned transport vehicle (UTV) when operating on rough terrain is a difficult task. The most difficult is the problem of the tracked UTV motion. Simplification of the controlled motion simulation, ambiguity of the track – terrain interaction parameters, the random nature of external impacts lead to fuzziness of the status parameters of the UTV as a controlled object. The article proposes a method for trajectory planning of the UTV motion, taking into account the nonholonomic nature of the track – terrain interaction. Within this objective, three aspects of the research stand out sharply. First, refinement of the tracked vehicle mathematical model. Secondly, the Voronoi diagram method is the basis of the algorithm for motion trajectory planning. Thirdly, the parameters of interaction with the external environment, in particular, the dependences of the coefficient of resistance to side slip, being obtained in real time, allow us to synthesize a correcting matrix that provides for increased motion stability. The effectiveness of the proposed approach is planned to be assessed by UTV controlled motion simulation and during experimental investigations.
Determination of the design parameters of the simulator breathing apparatus for training complexes
Authors: Obukhov Artem , Dedov Denis , Arkhipov Alexey
Published: January 2020

The paper considers an approach of improving the quality of training for personnel of industrial and mining enterprises working in polluted atmosphere conditions through the use of training complexes. Within the framework of this problem, the choice of designs of heating units for gas breathing mixes and breathing resistance for the breathing apparatus simulator of the training complex is considered. A comparative analysis of possible designs and the choice of the optimal solution are implemented. The resulted simulator allows you to properly organize the learning process and increase its effectiveness by eliminating one-time and expensive self-rescuers. Practical studies of the simulator with selected designs of heating units and breathing resistance were carried out in order to verify that its functioning complies with the real-life insulating breathing apparatus.
Friction Stir Welds Strength under Two-Dimensional Stress State Conditions
Authors: Pashchenko V V , Trukhanov K Yu , Tsarkov A V
Published: January 2020

The friction stir welding (FSW) is a solid-state joining technique. This process is normally used for different aluminum and magnesium alloys. FSW provides joint mechanical properties superior to arc welding. This properties estimation is a result of uniaxial tension test. In the vast majority of cases the welded plate structures are operated under biaxial stress state. This paper aims at establishing a relationship between biaxial loading conditions and mechanical properties in welding of 5083 type aluminum alloy using friction stir welding. The biaxial stress state was formed due to particularly designed samples. The specimens with different geometry and location of the pairs of raisers stresses are considered. All calculations were performed in ANSYS. The experimental verification of the numerical simulation results is presented.
Mechanical challenges of electrical transmission lines inspection robot
Authors: Bahrami M R , Abed S A
Published: January 2020

In this article, the dynamics of electrical transmission lines inspection robot while moving on the line has been investigated and mathematical modeling issues of its movement along the conductors have been considered. In order to achieve dynamical stability during the movement of inspection robot on the electrical line variation methods for problems of stretched string has been considered and solved. However, line inspection robot operation might be subject to failures because of conductor vibration. In this article, the robot-inspector considered as moving load and pendulum. As a result of even steady motion of inspection robot on the line, saw-tooth oscillations have been observed in the vertical plane that causes parametric oscillations in the perpendicular plane. In order to avoid dangerous oscillation, dynamic vibration absorber has been designed. The behavior of electrical line inspection robot motion through transmission lines has been studied.
Brake resistors power determination technique at the wheel vehicle with traction electric drive engineering stage
Authors: Sarach Evgeniy , Gorelov Vasiliy , Sarach Michael
Published: January 2020

This paper presents electric brake system parameters determination problem on the multiaxial wheel vehicle with traction electric drive engineering stage. Brake resistors power determination method using vehicle motion imitational mathematical modeling is proposed.
Aerodynamic characteristics of a rotating sphere
Authors: Crawford K R , Mitiukov N W , Busygina E L
Published: January 2020

Modern ballistic models, both internal and external, are amazingly accurate. This is due in no small part to the advances in technology that reduced tolerances in the guns and provided testing equipment that provided consistent and valid results. There are few variables. This cannot be said for the era of smooth-bore cannon using black powder and firing spherical projectiles. The number of variables, both internal and external, prohibits the use of modern ballistic models. Therefore, research into those weapon systems must be focused on one variable at a time to build a firm understanding for the creation of a suitable model. The discrepancy in the coefficient of aerodynamic drag of the sphere can be explained by the rotation of the ball and the Magnus effect. The maximum variance is ±5.6%. This means that when internal ballistic calculations of smooth-bore guns must determine the speed of rotation of the ball for use in the external ballistics calculations.
Throughput analysis for order picking system with automated storage system
Authors: Nosko Andrey L , Safronov Eugene V , Boslovyak Pavel V
Published: January 2020

An example of using vertical lift systems for order picking tasks is given. Logical-mathematical is described and a simulation model of the picking process is built. Using simulation modeling allows you to calculate the performance of the picking process, the amount of necessary equipment and workplaces.
A research of microstresses and phase composition in alloys T30К4, T5К10 using diffraction of thermal neutrons
Authors: Chuikov S S , Chuikov R S , Stavyshenko A S
Published: January 2020

Samples T30К4, T5К10 are examined using diffraction of thermal neutrons in temperatures interval 20-600°C on reactor ИБР-2М (ОИЯИ). Temperature dependencies of a parameter of a hurdle of inner stresses of 3-rd type were calculated using Ritveld method taking into account diffraction specter. Experimental results of changes of crystal hurdles (TiW)C and WC are presented.