bluuebunny/crossref_metadata_2025_split huggingface dataset:
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

Abstract
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.
Macrorelief and chemical composition of a surface of details made of stainless steels after electrochemical polishing in a non-stationary electrolysis mode
Authors: Stavyshenko A S , Chuikov R S , Chuikov S S , Plekhanov V I 
Published: January 2020

Abstract
This paper is dedicated to study of the macrorelief and the chemical composition of the surface of the details made of stainless steel after the electrochemical polishing in the nonstationary electrolysis mode with usage of a scanning electron microscope JEOL JSM-6510A. We presented images of the surface of samples under test and spectrograms of quantity distribution of chemical elements in their near surface layers after a processing in different technological modes (process phases). We made a calculation of sizes of the surface irregularities and an average number of chemical elements distribution in the near surface layers of the samples under test. We presented diagrams of a dependence of the surface irregularities sizes of the samples under test on the technological modes of the processing.
Optimization and optimality of frames with equally stable parts (links)
Authors: Shein A I 
Published: January 2020

Abstract
The problem of optimal design of transport overpass supports has the form of the problem of optimization of multi-storey frame system from the condition of stability. Analysis of the work of individual elements of frame systems in existing design solutions shows that not all parts of the frame are effectively involved in ensuring the overall stability of the structure. In this regard, it is important to solve the problem of optimization of frame elements with equal stability of individual parts. It is important to know the ratio of optimal frames and optimal frames with equally stable links. In an apparatus of forming a mathematical model of the critical state is adopted the method of displacement with the trigonometric functions, the effects of longitudinal forces on the reaction. The condition of the critical state of multi-storey frames, the stiffness matrix of which is the Jacobian matrix, is written by the determinant equation. The General solution of the problem of optimization of multi-storey frames in an analytical, closed form was obtained by the author earlier. For a complete analytical solution of optimization problems for equally stable parts, it is necessary to find solutions to two optimization problems for free frame links and two problems for non-free frame links. By a decision established that, forming the frame of the optimal revostock parts, we obtain a frame equivalent to the optimal non-segmented frame. And, therefore, the position stated by A. F. Smirnov that the most rational of the stability condition of the system will be such, all links (parts) of which have equal stability is true. The frame of the minimum mass with equal parts is optimal from the stability condition.
Theoretical and experimental optimization of vibro-acoustic parameters of MKSM-800 loader
Authors: Taratorkin A I , Taratorkin I A , Trusevich I A 
Published: January 2020

Abstract
This paper presents the results of a theoretical and experimental study of the vibro-acoustic radiation of the mini loader (MKSM-800), and analyzes the variant of reducing the noise level both of the loader on the whole and of its specific structural components. It estimates the vibro-acoustic activity of an internal combustion engine (ICE), including the cooling system, and the left and right side reduction gear. On the basis of the dynamic analysis of the mechanical system structures, the most dangerous forms of oscillations are determined, they contribute to the integral level of acoustic radiation most of all. This waveshape damping is achieved by targeted ribbing of the structural components of the reduction gear, as well as by reducing the vibroactivity of the excitation source by increasing the precision degree in gear manufacturing.
Polymeric materials turning on the base of blanks preliminary twisting
Authors: Erenkov Oleg , Anikeeva Olesya , Ivakhnenko Alexander 
Published: January 2020

Abstract
The theoretical and experimental research results of the new method for polymeric materials turning are presented in the article. The workpiece material preliminary deformation by twisting is the distinctive feature of the developed method. It is theoretically shown that the maximum stresses value during twisting is formed on the workpiece surface layer. It has been experimentally proved that the workpiece deformation by twisting leads to changes in the stress-strain state of the polymer chain. The workpieces pre-deformation by twisting allows obtaining the more qualitative surface layer than in case of the traditional turning.
Developing a digital control system for the main drives of an open-pit excavator as a major field of increasing the efficiency of excavator operation
Authors: Lukashuk O A , Komissarov A P , Lagunova Yu A 
Published: January 2020

Abstract
The specifics of rock excavation using a front-shovel operational equipment are addressed in the paper. Excavation, carried out by actuating (thrusting and lifting) mechanisms of an excavator, is shown to form a leverage mechanism which consists of operational equipment elements and connects the main actuating mechanisms with the bucket, thus forming a common transmission mechanism for their drives. Mechanical energy of the main drives is converted to energy-force parameters realized at the cutting edge of the bucket (its teeth) in agreement with kinematic properties of the mechanism. Expressions for transfer functions of the leverage, which define relations between the energy-force parameters at the cutting edge and operating parameters (velocities of operating motions), were obtained. A flow chart for calculating the operating parameters was developed. A digital control system on its basis would allow to increase the excavating efficiency.
Modelling of correlation of actual and program feeds in the automatic cycle
Authors: Akintseva A V , Prokhorov A V , Omelchenko S V 
Published: January 2020

Abstract
The article presents a model for calculating the current values of the actual radial feed in the internal grinding process controlled in an automatic cycle on a CNC machine. The model establishes the correlation of actual and program feeds with cutting forces, elastic deformation of the technological system, cutting modes, geometrical parameters of the contact area between the wheel and the workpiece, wheel characteristics and other technological parameters and conditions of processing in a wide range of their variation. The obtained model is used for predicting radii changes of the machined hole surface starting from the workpiece to the final size for a given automatic cycle and various technological conditions of the internal grinding operation. The model described in this article is the basis for the development of methodology for multiparameter optimization of grinding cycles in a multidimensional space of control parameters.
Quadrature finite element method for the problem on eigenvibrations of a bar with elastic support
Authors: Korosteleva D M , Solov’ev P S , Solov’ev S I 
Published: January 2020

Abstract
The differential eigenvalue problem describing eigenvibrations of a bar with fixed ends and with elastic support at an interior point 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 formulate a limit differential eigenvalue problem and prove the convergence of the eigenvalues and eigenfunctions of the initial problem to the corresponding eigenvalues and eigenfunctions of the limit problem as stiffness coefficient tending to infinity. The original differential eigenvalue problem is approximated by the quadrature finite element method of arbitrary order on a uniform grid. Error estimates for approximate eigenvalues and eigenfunctions are established. Theoretical results are illustrated by numerical experiments for a model problem. Investigations of this paper can be generalized for the cases of more complicated and important problems on eigenvibrations of beams, plates and shells with elastic support.
Analysis viscoelastic properties of the composite leaf spring
Authors: Belyaeva A A , Evseev K B 
Published: January 2020

Abstract
In modern conditions of market competition leading manufacturers of wheeled vehicles and their components actively introduce new technologies in the process of production of their products. One of the directions of modern automobile industry development is application of new materials, which include polymeric composite materials (PCM). In the given research the analysis of elastic properties of a leaf spring made of application of polymeric composite materials is carried out. In the study the analysis of the construction by finite element (FE) method and the analysis of the results of bench tests are carried out. To carry out the research, the appropriate design was made, the methods of testing of the elastic element under consideration were developed, the composite spring was mathematically simulated for the purpose of its verification and the possibility of its further use. As a result of the work performed, the maximum deflections of the leaf spring under consideration were established when loading the corresponding load in the suspension system of GAZ-2752 "Sobol" car. The executed bench experiment has established he maximum deflection of a spring. Similar values were obtained by the FE-method. These results show that it is impossible to use the leaf spring in the suspension system of a GAZ-2752 car.
Simulation of movement of a high-speed stage of a monorail rocket train along an elastic guide, taking into account wave processes in it and conditions at the sliding contact
Authors: Erofeev V I , Gerasimov S I , Odzerikho I A 
Published: January 2020

Abstract
The processes of changing the mechanical characteristics of the material, intensive plastic deformations and the entrainment of material from the working surfaces are studied at high-speed sliding of loads along the rail guides of the rocket track.
Influence of body size on rebound height after shock interaction
Authors: Lapshin V , Kobzov D 
Published: January 2020

Abstract
The mechanorheological model was used to study the relationship of the body size and the rebound height after impact interaction. With an increase in the diameter of a spherical body, the body mass and the radius of surface curvature increase. Therefore, effects of both factors and each separate factor were evaluated. The study identified that with a simultaneous increase in the body mass and the radius of curvature, the rebound height decreases. An increase in the body mass has a slight effect on the rebound height. For the elastic plastic model, an increase in the body mass causes an increase in plastic deformations and a decrease in the rebound height. For the viscoelastic model, an increase in the body mass causes a slight increase in the rebound height. With an increase in the radius f curvature, the rebound height decreases. An increase in model plasticity decreases the rebound height at various values of viscoelastic plastic parameters of the model due to the fact that a lot of impact energy is spent on plastic deformations rather than on the elastic rebound of the body. The research results showed that the rebound height depends on the size of the impacting body.
Increasing the durability of grinding wheels by reducing the wear of its limiting sections of the profile
Authors: Salov P M , Salova D P , Vinogradova T G 
Published: January 2020

Abstract
Due to the edge wear and natural running-in, abrasive wheels do not have equal resistance to the profile. After flattening, the most weakened grains are removed from the wheel. Further, the wheel wears out in accordance with the law of natural running-on. The work on the basis of a systematic approach solved two main tasks: to analyze the relationship of resistance to self-sharpening; to develop and implement measures to improve the resistance of areas of the wheel, exposed for any reason the greatest wear or blunt.The paper analyzes the wear of the wheels during grinding and flattening. The finite element method is used to estimate the thermal stress in the ruling elements and grains. Not only a high probability of the formation of thermal microcracks was established, but also the destruction of grains at the moment of their exit from the contact zone. Edging device for flattening has been designed. A new scheme of forming a rectangular profile is proposed. New conditions for the grinding of the corner wheels were proposed.
Technological residual stresses during grinding of high-strength steels
Authors: Salov P M , Salova D P , Shalunov E P 
Published: January 2020

Abstract
The quality of parts made of high-strength steels is largely determined by the ability to perceive alternating cyclic loads. This ability depends on the sign and the level of technological stresses generated largely in the final operations. Residual stresses are the result of the combined effect of stresses from forces, temperatures, and structural transformations. A significant part of specialists in this field believe that the dominant factor in their formation is heat. Thermoplastic deformations and phase-structural transformations occur under the influence of cutting heat. There are tensile stresses that reduce the cyclic strength of parts. The aim of the work is to develop recommendations for providing on the surfaces of parts made of high-strength steels favorable residual stresses. For its implementation, a deep study of the known mechanisms of the formation of residual stresses is carried out, the process of chip formation during cutting with a cutter with a negative front angle is considered in depth, the role of the modified temperature, smoothing effect is revealed.
The instrument geometrical parameters calculation theory for the pressure processing of the round-rolled surface
Authors: Antimonov A M , Pushkareva N B 
Published: January 2020

Abstract
The problem of round-rolled surface products improving quality by reducing roughness and waviness is solved. Traditionally, grinding is used to improve the surface quality, but at the same time new defects appear in the form of cracks, tinge colours and the abrasive particles infiltration into the surface layer. Surface pressure processing instead of grinding is not associated with such defects, therefore, it is proposed to use a transverse rolling. Rolling rational profile for transverse rolling of round-rolled surface was theoretically determined. Analytical dependences were obtained for rolls in cage with support rings calibration calculations. Such calibration use ensures uniform deterioration of rolls and rings bearing surfaces, as well as the rolls balance with their one-sided load during rolling. A parametric analysis of the deformation conditions effect on the rolls geometry was performed. The conditions when rolls profile can be limited to a circle or a straight line were considered. The obtained results were used in rolls profiling for drawing the rolling surface in laboratory and industrial conditions.
Nanomaterials and nanotechnology: prospects for technological re-equipment in the power engineering industry
Authors: Inshakova E , Inshakova A 
Published: January 2020

Abstract
The authors substantiate the potential of nanotechnology in the technology modernization of the power engineering industry (PEI) enterprises aimed at achieving production efficiency growth. The key factors encouraging the PEI companies to undertake technological re-equipment (stable and rapid nanotechnology market growth, expanding nanomaterials application and reducing costs along with the increase in the global energy consumption) are revealed. The authors state that the opportunities for the widespread use of the new nanotechnologies and nanomaterials in the PEI are directly related to the formation of regulatory and technical support for the life cycle of nanotechnology products. Within that framework, formation of the global and Russian system of standardization and certification in nanotechnology field is exercised. The factors restraining the process of the PEI companies’ technology modernization (the lack of funds, delay of standardization, metrology and certification in relation to the pace of nanotechnology development, insufficient companies’ interest) are disclosed. Prospective algorithm of technological re-equipment of the PEI companies is suggested.
Analysis of forced vibrations of conveyor belts
Authors: Kozhushko G G , Yampolsky D A , Lukashuk M D 
Published: January 2020

Abstract
The paper presents the study of forced transverse vibrations of conveyor belts. Those are caused by rollers having an eccentricity, which originates either from production errors or transported material sticking to bearing rollers of the lower conveyor branch. The dynamic behavior of the belt was analyzed by solving a boundary problem described by differential equations expressed in partial derivatives and corresponding boundary conditions. The solution helped to determine modal parameters of the system – eigenfrequencies and eigenforms of vibrations, which, in their main modes, would be the basis of practical recommendations for selecting such parameters of conveyor systems and their operational modes which could prevent the system from getting into a resonance state.
Multidimensional monitoring of a streaming process
Authors: Pishchukhin Aleksandr 
Published: January 2020

Abstract
The work is devoted to a multidimensional approach to the presentation of monitoring information about the streaming technological process, which is accompanied by a rather strict ratio of the durations of each of the operations. Usually these operations are quite a lot, and a small loss of time on one operation can be compensated for subsequent ones, the control of the duration of each of the operations is not very informative. In this case, it becomes relevant to consider the state of the technological process in a multidimensional space, the coordinates of the imaging points in which are the duration of each operation at a given time. Since the ratio of the durations of operations with each other must be fairly strictly conserved, it sets in a multidimensional space a ray of temporary operational norms. On the other hand, the sum of all operations determines the performance and so that it always lies on the hyperplane, for coordinates the scaling factors are determined. This hyperplane is called the equal contribution hyperplane. The difference between a real technological process and a normal one (deviation from the norm beam) can be estimated by two parameters determined in the plane of equal contributions: the distance of the imaging point from the intersection point of the norm beam and the plane of equal contributions and the angle of rotation of the beam to the imaging point relative to the reference operation of the technological process.
Calculation of force and energy parameters of fracture in the area of the front of the crack in the shell of the reactor of coke chambers
Authors: Zhernakov V S , Budilov I N , Koneva K V 
Published: January 2020

Abstract
This paper presents a three-dimensional elastic calculation of the stress-strain state of the reactor and the force and energy parameters fracture for an elliptical crack located in a cylindrical shell. It is found that for an elliptic crack, the force and energy parameters of the fracture change nonlinearly along the crack front. The qualitative and quantitative relations for the stress intensity factors (SIF and J-integral along the crack front taking into account its size, the shape of the front and the angle of inclination) are obtained.
Ground vehicles hydraulic system pneumatic hydraulic valve
Authors: Burlachenko O V , Fomenko N V , Lyashenko A A 
Published: January 2020

Abstract
Hydraulic systems equipped with working bodies hydraulic drives are widely used in ground vehicles. The researches show that one of the modern hydraulic drives problems is the destruction of flexible high-pressure hoses and the unauthorized pressure fluid discharge into the atmosphere. The analysis of the machines hydraulic drive protecting existing methods shows that the urgency of their improvement problem remains, since, for most of them the loss is between 3 and 10 l when operating, for example, pneumatic electric protection system - 6 … 8 l., float protection system is up to 10 l. As can be seen from the analysis, after the protection system locking device actuation leakage of the pressure fluid is preserved. The hydromechanical hydraulic drive protection system is the closest in technical essence and the achieved technical result. However, it also has a disadvantage, for example, when the locking device is actuated a hydraulic shock occurs, and leads to an oscillatory process of the plunger, an increase in the overlap time of the damaged hydraulic line, a decrease in the speed of the locking device and its operational reliability. To eliminate these shortcomings, the authors propose a new technical solution.
Semi-Markov Model of a Technical System with Maintenance and Time Reserve
Authors: Glech Sergey G , Sidorov Stanislav M , Nikitin Mikhail M 
Published: January 2020

Abstract
Ensuring high reliability of technical systems requires the construction of adequate mathematical models of their functioning, taking into account not only individual factors that increase reliability (maintenance, redundancy, control, etc.), but also their combinations. In this paper, a semi-Markov model of a technical system with calendar maintenance and time reserve is constructed. For an approximate determination of the stationary characteristics of the reliability of the system, the phase merging scheme algorithm is used. The effect of the time reserve on the reliability characteristics of the system under consideration is analyzed.
Antifriction powder bronzes with mechanically alloyed copper-based granules
Authors: Smirnov V M , Shalunov E P 
Published: January 2020

Abstract
New antifriction composite materials of matrix-filled type based on tin bronze powder for heavily loaded elements of friction units are presented. As their load-bearing structural component heat – and wear-resistant fillers in the form of copper-based granules with the initial composition Cu-5% Al-2% C-2% MoS2 are used, obtained in the course of the reactionary mechanical alloying of copper powder in the air of attritor by aluminum and lubricating additives in the form of graphite and molybdenum disulfide. Dynamically thermostable particles in the form of γ–Al2O3 oxides of nanodispersed level, mechanochemically synthesized in the attritor, are evenly distributed in copper-based cold-hardened granules and provide them with a high temperature of softening - up to 08…0.9 of the melting temperature of copper. The addition of such granules to powder bronze with 5 wt% tin allowed to obtain antifriction composite materials, which in terms of mechanical and tribotechnical properties significantly exceed the standard antifriction tin and aluminum bronzes and, in particular, bronze EN CuSn8 and EN CuAl10Ni5Fe4.