bluuebunny/crossref_metadata_2025_split huggingface dataset:
Two power split path hydrodynamic drive train of the commercial tractor
Authors: Vyaznikov M V , Vyaznikov A M 
Published: January 2020

Abstract
The article presents hydromechanical drive trains with a differential link at the input and output. As a differential link, three-link differential mechanisms with mixed gears mesh are used. The possible schemes of two-path hydrodynamic drive trains are investigated. It is shown that the operation mode of a two-path hydromechanical drive train is possible when the turbine wheel of the torque converter rotates in the direction opposite to the impeller rotation. This factor is taken into account when choosing the characteristics of a two-path hydromechanical drive train. It has been established that for the most common two-path hydromechanical drive train scheme, the planetary gear set characteristic reduction increases its maximum efficiency, decreases the torque converter active diameter and increases the relative speed ratio of the three-link differential spider pinion. It is shown that a two-path hydromechanical drive train in comparison with a one-path drive train allows for using more efficiently the engine transforming property to change the torque when changing the output load on the engine, which is very important for commercial tractors operating under variable load conditions.
Analysis of thermal stabilization process for organomorphic preforms made of oxidized polyacrylonitrile
Authors: Prosuntsov P V , Bogachev E A , Elakov A B 
Published: January 2020

Abstract
Simulation and analysis of thermophysical processes in PAN-fiber-based pressed samples that occurs during thermal stabilization were carried out. It is significant fact from the heat transfer point of view that the heat stabilization process proceeds with a definite exothermic effect. Herewith a strongly pronounced coupling between both the intensity of heat generation and the temperature level and heating rate at each point of the sample was observed. The influence of the main factors that effects on the sample temperature state, such as the density and thermal conductivity of the preform material, also the rate constants of the thermal stabilization process, was studied. The experimental data of the sample temperature state in the thermal stabilization process is presented and was compared with the analysis results.
Special purpose composite materials for wheel-rail contact
Authors: Maiba Igor , Glazunov Dmitry , Maiba Vita 
Published: January 2020

Abstract
The paper deals with special-purpose friction materials for the contact «wheel-rail», designed to improve the adhesion of the locomotive wheels with the rails, reducing the resistance to the movement of the impact on the track, increasing the rolling stock wheels and rails resource. The authors used the generalized world and native experience in the application of existing and developed devices designed for the activators and modifiers applying in the contact zone «wheel-rail», as well as test results. The requirements to the methods of physical and chemical properties testing, to the values of the main indicators of physical, chemical and mechanical properties of friction activators and modifiers are presented, the requirements of the modifier and friction activator resource and friction coefficients from their application are substantiated. Needs to values of operational characteristics of activators and modifiers of friction which are established by results of field and operational tests carried out by special programs and techniques have been formulated.
Simulation of stress-strain state at the boundaries of a bimetallic composite to determine tear-off resistance
Authors: Zalazinskii A G , Kryuchkov D I , Shveikin V P 
Published: January 2020

Abstract
Simulation modeling of the deformation under mechanical action on the sample workpiece of the steel-aluminum bimetallic composite material with a thin aluminum intermediate layer was performed. The stress-strain state along the boundaries of the joint at which the sample workpiece layering occurs was determined. A series of computational experiments with varying the specific work value of the layering under separation conditions was implemented. The level of stresses, leading to the separation of the bimetallic compound, is estimated using the energy criterion. The dependence of the rupture strength along the ring contour on the specific work value of the layering varied in the range of 0.1-0.2 N/mm was calculated. It was established that for the studied variants of the computational experiment, a rigid stress state with the predominance of normal tensile stresses is implemented in place of the beginning of the layering.
Experiment-calculated estimation of the stability of arc welding technologies to be developed
Authors: Golubina S A , Bulychev V V 
Published: January 2020

Abstract
The article presents a method of calculating the stability assessment of welding quality indicators based on the use of deterministic dependencies and quite easily defined distribution laws of controlled parameters of the welding mode. Dependences for calculation of probability of reception of the set width of a welded seam depending on the law of distribution of linear energy are received. The use of this method will reduce the cost of experimental selection of welding modes, the production of full-scale samples for statistical quality control, to clarify the requirements for the welding equipment used.
Machine learning based approach to detection of anomalous data from sensors in cyber-physical water supply systems
Authors: Meleshko A V , Desnitsky V A , Kotenko I V 
Published: January 2020

Abstract
The paper proposes an approach to detection of anomalous data from sensors in cyber-physical systems on an example of a water supply supply system. The approach is based on methods of machine learning and modeling of technical systems. The primary data for machine learning was obtained on the developed software/hardware prototype of the water supply system by using a number of microcontrollers, sensors and actuators. The experiments confirmed the feasibility of the proposed approach. Several machine learning methods from scikit-learn library of the Python programming language were tested. As a result of the experiments we identified a learning method and its parameters ensuring the highest accuracy of the abnormal situations recognition.
Prevention of undercutting of the leg of the tooth of cylindrical helical gears during roughing and finishing gear processing
Authors: Safarov Damir , Kondrashov Alexey 
Published: January 2020

Abstract
The article discusses design factors leading to inconsistencies in the diametrical dimensions of the boundary point of the transition curve of the helical wheel. The conditions for the implementation of the graphic run-outs of the gear rack of a worm gear-cutting cutter, ensuring the formation of the active length of the involute wheel profile throughout its length, are formulated. The effect of a change in the design parameters of a helper milling tee on the duration of the interaction of the cutting edges and the diametric dimensions of the boundary points of the transition curve of the helical wheel is shown. Reducing the height of the prominence of the worm cutter leads to an increase in the required length of interaction in the steps of the cutter in the process of forming the active profile of the gear tooth. If the graphic run-in does not take into account the actual length of the interaction between the cutter and the workpiece, then the risk of the undercut of the tooth stem increases with decreasing height of the prominence. A diagram of the possible formation of undercutting of the tooth shaft and recommendations preventing its occurrence as a result of the implementation of graphic two-dimensional helical gears are given.
The lever rounding mechanisms
Authors: Kuznetsov S A 
Published: January 2020

Abstract
Mechanisms with complex movement of a curved executive organ rounding around a fixed set line, in the simplest case – direct line or circular arc – can be combined with guiding mechanisms in the analysis and synthesis tasks, if one assumes the center of curvature of the generator of the executive organ to be a guiding point. Moreover, the length of the rounding segment and the parameters of deviation can be also defined through the parameters of the guiding mechanism, whereby sliding in a reciprocal rounding depends on the generator’s curve radius. Unlike the less applied guiding mechanisms lever rounding mechanisms can find a broad application as executive organs in pressure-shaping machines (e.g. forging, molding, cutting, chipping, clamping and compacting), stepping and finned-type propelling devices and other unique mechanisms with a common feature of indifference of the structure and integration of qualities that are non-compatible at a simple movement of an executive organ.
Justification of the structure and analysis of functioning of the device for tensioning prestressing strands
Authors: Kutlubaev I M , Matsko E Yu , Samigullin V A 
Published: January 2020

Abstract
The problem of creating a compact device for tensioning prestressing strands used for strengthening the surface of workings in mines is considered. It is proposed to use a lever mechanism with a variable structure for providing movement in several degrees of freedom. The geometrical parameters of the mechanism for obtaining the required displacements and forces are determined. The design of the device allows its use by one executive without involvement of hydraulic or electric drives.
Quantitative evaluations of the effectiveness of vibrating and vibroimpact machines
Authors: Astashev Vladimir , Krupenin Vitaly 
Published: January 2020

Abstract
Using the example of an ultrasonic production machine, the problem of quantitative evaluation of the effectiveness of a vibrating machine is considered. Along with the classical approach, a more convenient and informative approach for vibrating and vibroimpact machines is considered, which is called a working (practical) approach. This approach is based on quantitative evaluations of the marginal and real utility of a technological process when performing this workload. It is shown that when implementing a resonant tuning of the machine, which provides the maximum working efficiency, the maximum possible efficiency in the classical sense can be equal to 50%.
CAD-system in solving design and inventive problems
Authors: Akhmedyanova Gulnara 
Published: January 2020

Abstract
The paper discusses the issues of user interaction with the CAD system. The system approach requires the study of the third element - the interface. In addition to the classical subsystem of receiving, transforming and transmitting user requests, the interface model includes testing, statistical analysis and recommendation subsystems. The task of the first subsystem includes an assessment of the user's creative potential, the second reveals the user's preferences and the conditions for their use, and finally, the third subsystem should prompt the user that in some cases there are more convenient tools than the ones he prefers. Further, the first subsystem is investigated in more detail. The experiment was conducted on a group of students in the study of the discipline "Fundamentals of engineering creativity" using two types of tasks: spatial imagination and kinematic thinking. It is shown that, as a first approximation, users can be divided into two classes and force the CAD system to compensate for their one-sidedness, by adding creativity when making design decisions in one case and an analyst in another. Thus, on the one hand, the creative potential of its user develops, on the other hand, the user has the right to demand from the CAD system greater adaptability and intelligence in communication.
Object recognition technology for autonomous unmanned control based on stereo data analysis and voxel representation of visible objects
Authors: Kotyuzanskiy L A , Chetverkin N V , Ryzhkova N G 
Published: January 2020

Abstract
The paper represents a description of the object recognition technology on a road using moving stereo pair of cameras in real time. The developed algorithm is characterized by high processing speed and performs reliable detection of arbitrary shape obstacles. Calculation time for one iteration from receiving input images (size 1280 * 480) to detecting obstacles is less than 2 msec for a Geforce GTX 1080T video card.
Basic approaches to the choice of methods of passenger traffic flow analysis
Authors: Kulev A V , Kulev M V , Kuleva N S 
Published: January 2020

Abstract
Analysis of passenger traffic flow is considered to be one the most important stages of planning and construction of the most appropriate route network of public municipal passenger transport. At the same time, a great variety of methods of passenger traffic flow analysis confuses and prevents from a proper choice of the precise methods to conduct a research. The aim of this article is to find and substantiate basic approaches which can help to find a practical set of methods for analysis of passenger traffic flow in particular cities. To achieve this aim the article analyzes basic advantages and disadvantages of each method, their application fields, restrictions which are set by conditions of different populated areas. The article also suggests research and methodological approach to finding the most appropriate methods of passenger traffic flow analysis.
The Influence of Selective Laser Melting Process Parameters on the Structure and Properties of Products Made from Metal Powders of Domestic Manufacture
Authors: Tarasova T , Filatova A 
Published: January 2020

Abstract
Rational selective laser melting modes have been established for the manufacture of parts from domestic powder of steel grade 20H13. The properties of PR20H13 powder have been studied using the methods of granulometric analysis. The physical and mechanical properties of samples manufactured using rational modes of selective melting have been determined.
Determination of quasi-static and residual stresses in the course of the thermoplastic hardening in a boundary layer of the material
Authors: Zhukov V V , Kudinov I V , Kutsev N M , Mikheeva G V , Klebleev R M 
Published: January 2020

Abstract
In order to induce residual compressive stresses in the boundary layer of a steel plate heated to temperature T
0 = 600 °C, a method of jet water cooling with time-varying heat transfer coefficients is considered. By solving the corresponding heat conduction problem, it is shown that the maximum temperature difference between the surface and the center of a 2 mm thick plate is 105 °C. It is observed within 0.02 s since the start of cooling, the time of its complete cooling is equal to 0,32 s. Calculations of temperature stresses using the finite element method showed that temperature tensile stresses occur on the outer surface of the plate. They may reach 26 kg/mm
2 which exceeds the yield strength of this material. As a result of plastic deformation, the thermal tensile stress relieving occurs in the course of cooling of the plate surface layer; when it is completely cooled, the residual compressive stresses 21.8kg/mm
2. (on the surface of the plate) are induced in this layer (0,25 mm depth).
Digital equipment twin as the basis for the consumer in digital production
Authors: Shatagin Dmitrii , Kuz’mishina Anastasiya , Kolchin Pavel 
Published: January 2020

Abstract
A number of neural network models is presented when developing an aggregated digital twin of equipment as a cyber-physical system. Considered in detail are the twins of machining accuracy, chip formation and tool wear, on the basis of which systems for stabilizing the chip forming process during cutting and diagnostics of cutting tool wear are proposed.
Generation the efficient measuring instruments kit in the computer – aided preproduction planning’s system for multiproduct machine manufactory
Authors: Reshetnikova E , Bochkarev P , Nazaryev A 
Published: January 2020

Abstract
Today it is necessary to change the existing nature of the organization of production in connection with the current trend of transition to the intellectualization of technological preparation of production. Therefore, the actual and fundamentally new today is the creation of a system that will allow you to plan the production process in an automated mode. It is possible to implement on the basis of the development of many variants of technological processes of mechanical processing of the manufactured products. To choose the optimal technological process from the developed, for the current production situation it is necessary to apply a set of control and measuring procedures proposed by the authors. From the subtasks of the complex of control and measuring procedures in One automated system of design of technological processes of machining is the formation of a rational set of measuring instruments, and the solution of this problem is a prospect for the introduction of digitalization of production.
Computer simulation of kinematics of parallel mechanisms
Authors: Mkrtychev Oleg , Kartygin Aleksandr , Cherbachi Iuliia 
Published: January 2020

Abstract
The paper deals with the kinematic analysis of a planar parallel mechanism. The use of parallel mechanisms makes the tasks of controlling the arms on the basis of these mechanisms difficult, since the solutions of the problems of kinematics and the dynamics of mechanisms are complicated. This leads to more complex control systems for such machines. Therefore, it becomes important to develop appropriate templates for solving certain problems of kinematics and dynamics for certain types of parallel mechanisms. In this paper, a planar parallel mechanism in the form of a tripod with three rotational pairs in each leg is considered.
Analysis of granular materials vibrorheology of a railway sanding system
Authors: Konovalov P Y , Bulavin Y P , Volkov I V 
Published: January 2020

Abstract
In this research work, after allowing the experiment to run, we proved the possibility to dose sand in the sand feeding system with the effect of vibratory displacement. We set the disturbing frequency and amplitude, at which the maximum system performance is achieved. The sand consumption curves were obtained depending on the oscillation frequency, pulse shape, and tilt angle. A model proposed to describe the effect of vibrodisplacement in a sand feeding system. It was established that disturbances cause sand oscillations at multitude frequencies, coinciding with which resonance phenomena occur. In practice, it means the increase in consumption.
Production of the steel casting with improved dimensional and geometrical accuracy using complex models
Authors: Zhilin S G , Komarov O N , Bogdanova N A 
Published: January 2020

Abstract
Modern conditions of functioning of mechanical-engineering enterprises are determined by the need to develop and to use the technologies for casting products manufacturing with minimal costs for processing. Such requirements are met by the technology of precise casting manufacturing made by complex models. There have been developed technological variants of forming of complex casting models based on the pressing of powder made from the wax-like composition on a metal or aluminothermic unit with subsequent creating of the single-piece ceramic shell. The use of such technological solutions allows to minimize the processing of cast products, to obtain bimetallic castings with high dimensional and geometric accuracy, and realizes the possibility to use the waste of metallurgy (scale and metal chips).
Study of the use of microwave radiation for heating process fluids in a vehicle
Authors: Anisimov I A , Gorbunova A D , Tishin M M 
Published: January 2020

AbstractThe predominance of a cold climate in the territory of the Russian Federation causes the prevalence of low-temperature conditions during the operation of vehicles, which cause a decrease in the reliability of the engine start-up and an increase in its warm-up time. At the present time, changing the operating modes of the engine fuel system, the introduction of additives to improve the quality of fuel, as well as the use of various types of heaters, one of which is the heating of process fluids with microwave radiation are ways to solve these problems. The use of microwave radiation for heating liquids is considered in the field of railway and pipeline transport, but is not well understood in road transport. Earlier studies have allowed to establish the change in physic and chemical properties in the processing of fuel microwave radiation. The purpose of this article is to study the effect of the use of microwave-treated fuels on the quality of engine start-up and warm-up under low temperature conditions.
Experimental and numerical determination of the barrier layer effect in the composite on the crack propagation
Authors: Kuznetsov Aleksei , Kamantsev Ivan 
Published: January 2020

Abstract
Cyclic crack resistance tests of samples from a seven-layer metallic material obtained by the method of hot rolling were carried out. Identified features of fatigue cracks propagation. Mathematical finite element models describe the stress state at various stages of the experiment are constructed. The features of a finite thickness barrier layer effect in modeling the fatigue crack behavior are revealed.
Contact characteristics of a sphere with a layered elastic half-space
Authors: Ogar P M , Kozhevnikov A S , Kushnarev V S 
Published: January 2020

Abstract
On the basis of a simplified rigid model of a layered elastic body, an engineering technique for determining the parameters of a contact is proposed for the introduction of a spherical indenter into it. The model is based on the dependence of the displacement of the points of the half-space along the axis of symmetry on the magnitude of the applied distributed load. The reduced elasticity modulus and the Poisson's ratio are determined depending on the elastic properties of the base and coating materials, the thickness of the coating and the radius of the contact area. Expressions are given for determining the parameters of a contact when a spherical indenter is introduced into a layered body. The obtained results are compared with the exact solution of the spatial axisymmetric problem for describing the stress-strain state in an elastic layer when a spherical indenter is introduced into it, using the Fourier-Bessel integral transformation method. An analysis of the comparison of the results obtained with the results of exact solutions makes it possible to recommend the proposed engineering method for practical use.
Development and Research of Technological Equipment that Implements Dynamic Control of Process of Additive Fabrication of Parts of Complex Spatial Shapes Based on Mechanisms with a Hybrid Layout
Authors: Grechukhin A , Kuts V , Oleshitskiy A 
Published: January 2020

Abstract
The article is devoted to the study of the accuracy of fabrication of the surface layer of engineering products by additive methods. The analysis of the advantages and disadvantages of technology for layer-by-layer synthesis of products took place. It was revealed that with additive fabrication, the accuracy characteristics of the surface layer are significantly different from the characteristics of the surface layer of products obtained by traditional methods. The analysis of domestic and foreign works on the topic of research allowed to reveal that in order to increase the accuracy characteristics of products obtained by additive methods, it was necessary to provide dynamic control of the spatial orientation of the final link of the fabrication system of the additive installation in the process of fabrication. To control the spatial orientation of the working body of additive equipment, the use of mechanisms with a hybrid layout was proposed. The problem of parametric synthesis of a mechanism with a hybrid layout has been solved, which allows to create a space of design parameters that provide, at the early stages of design, the required formative capabilities of the mechanism for additive fabrication with a hybrid layout.