bluuebunny/crossref_metadata_2025_split huggingface dataset:
Nonlinear strain waves in a metamaterial defined a mass-to-mass chain
Authors: Erofeev Vladimir , Kolesov Daniil , Malkhanov Alexey 
Published: January 2020

Abstract
A mathematical model is proposed that is a chain of oscillators consisting of nonlinear elastic elements and masses, each of which contains an internal nonlinear oscillator. Such a model describes a mass-to-mass acoustic metamaterial class. It is shown that the obtained system of equations can be reduced to the nonlinear evolutionary equation of Benjamin-Bona-Mahoni, showing that spatially localized nonlinear deformation waves (solitons) can form in the metamaterial under dynamic action on it.
Numerical simulation in additive manufacturing of gas turbine parts
Authors: Inozemtsev Aleksandr , Smetannıkov Oleg , Dubrovskaia Aleksandra , Dongauzer Konstantin , Bushuev Leonid 
Published: January 2020

AbstractThe article describes the development of mathematical models and user environment in the APD language which are based on the finite element system solver and allow for the SLM physical process numeric modelling with the required accuracy. The main task is to evaluate the final shrinkage and residual strength of the blanks of gas turbine parts for optimizing the technological process of production. The activities on introducing pre-distortions into the part geometry were performed to compensate for thermal deformation during the growth process; the part with pre-distortion was produced and controlled.
Ultrasonic influence on the quality formation of surface layer when cutting thread
Authors: Golovkin Valery , Batishcheva Oksana , Papshev Valery 
Published: January 2020

Abstract
The paper deals with the issues of the quality assurance of thread surface layer during mechanical processing using forced ultrasonic vibrations. The results of the conducted research on the ultrasonic vibrations effect on the formation of thread surface layer quality characteristics are presented. Roughness, strain hardening and residual stresses are considered as the main characteristics.
The introduction of a mixed system of maintenance and repair of metal-cutting equipment
Authors: Gamberg A E , Ershova I V , Cherepanova E V 
Published: January 2020

Abstract
The article provides a comparative analysis of the Russian and foreign systems for the maintenance and repair of metal-cutting equipment. The limitations of the application of systems of universal maintenance of equipment, scheduled preventive maintenance and repair by state are analyzed. The influence of the age of the equipment and the percentage of the repair plan on the amount of emergency shutdowns is shown. The main stages of the introduction of mixed service and repair systems are highlighted. Criteria for classifying equipment groups are proposed for the selection of repair and maintenance systems. Examples of typical diagnostic signs of malfunctions of metal-cutting equipment and statistical time of emergency shutdown after their detection are given. The recommendations on planning the need for spare parts and organization of repair work are given.
Factors of successful diversification for machine-building enterprises
Authors: Murukina A D , Tipner L M , Kalinina N E 
Published: January 2020

Abstract
The relevance of the study is due to the need to diversify production in order to increase competitiveness and strengthen the economic sustainability of enterprises. Increasing the output of high-tech civil and dual-use products by enterprises of the military-industrial complex as part of the conversion is complicated by the lack of enterprises work experience in the market. Conversion of defense industry enterprises is an important and promising task, the solution of which is connected with the future of defense industry enterprises, the development of import substitution, the expansion of high-tech exports. The purpose of the study is to analyze the world experience of conversion, to study existing approaches to solving conversion implementation problems, creating a system of conversion success factors, monitoring the effect of external and internal conversion implementation factors, identifying actual problems of this process. The author's approach to solving conversion problems consists of identifying external and internal conversion success factors and combining them into a single system for the interaction between the state and defense enterprises. The study of the implementation of the indicated factors showed the degree of their development, as well as the directions that will contribute to the development of diversification.
Operation of high-technology product development based on functions and value
Authors: Prilytskaya M A , Murukina A D , Podoliak O O 
Published: January 2020

Abstract
The sector of military-industrial enterprises was the most state supported in recent years. It is obvious that success of strategic initiatives is defined by efficiency of the enterprises diversification and can provide bringing domestic products to the world market with the highest level of competitiveness. Military-industrial enterprises (as drivers of the economy development) have to provide the implementation of several national programs and projects: industry development, diversification, import substitution of hi-technology products, production of the export-oriented products, increase of labor productivity, digital economy. That’s why it is important to find effective solutions, which can provide achievement of several tasks. At the same time, effective development of civilian products is interfered by a number of organizational and economic conditions. For definition of the unique set of functionality and characteristics of a product on the basis of the unique customer needs (for competitive hi-tech export-oriented civilian products), the FSA was created. This model allows to provide the civilian products manufacture development due to paramount and constant orientation to requirements of the market and clients, and the production process improvements for cost reduction without damage to its quality.
Development of a model for the study of methods of intensification of heat exchange processes
Authors: Faizrahmanov Ilshat , Sabanaev Ildar 
Published: January 2020

Abstract
The research results of the convective heat transfer process and determination of the heat transfer coefficient in order to select effective ways to increase its intensity are presented. A physical model for obtaining experimental data is designed. It is shown that the mathematical description of the process belongs to the class of inverse problems of heat conductivity. The article proposes a solution algorithm based on the use of numerical methods. A computer model is developed that allows to obtain a solution in a real time mode. It includes a module for reading data coming to computer ports from sensors, a calculation module, a visualization and saving results module, and tools for user convenience. It is shown that the obtained solution can be used to study ways to increase intensity of heat transfer when designing equipment in chemical engineering and machine building.
Collecting diagnostic operational data from CNC machines during operation process
Authors: Martinov G M , Pushkov R L , Evstafieva S V 
Published: January 2020

Abstract
The article deals with issues related to obtaining operational data from process equipment and machine parameters of the CNC system in order to monitor the correct use of equipment, and to comply with the regulations for its operation [1]. Data is collected using data acquisition modules that can work with equipment using specific protocols. To store and process the received data using its own REST-server. The obtained data at the request of the user can be configured by selecting from a common array of data and designating them.
Application problems of process capability evaluation methods in modern quality assurance systems
Authors: Egorov Sergey , Kapitanov Alexey , Kozlova Aleksandra 
Published: January 2020

Abstract
The article discusses the most important issues for industrial quality assurance systems, such as calculation of capability and performance indices. Techniques being currently used at most enterprises, their advantages and disadvantages are assessed. Modern methods for calculating capability indices are proposed and a conclusion is made about the need to streamline the concepts of capability and performance. A conclusion is made about the need to use the proposed technique, which main difference is the ability to evaluate processes by the real distribution law, as well as about the risk of using EXCEL tables offered by many developers of quality assurance systems.
Optimization of conditions for small-rigid prismatic workpieces flat grinding by elastic deformations controlling
Authors: Tyshkevich V N , Nosenko V A , Sarazov A V 
Published: January 2020

Abstract
The authors propose the technique of optimization the conditions for small-rigid prismatic workpieces side surfaces flat grinding that guarantees obtaining the predefined quality requirements of the machined surface while ensuring the maximum process efficiency. The input factors (grinding wheel hardness, depth of grinding, table feed speed and run, etc.) are considered as the grinding process optimization parameters. Mathematical models of the output factors (surface roughness parameter Ra, absence of grinding burns, required flatness tolerance of surface) are used to limit the range of optimization parameters allowable values. The resulted efficiency is an objective function. The optimization of parameters in the range of allowable values is carried out with the view of ensuring the maximum process efficiency. The required flatness admission is provided at the second optimization stage of the workpieces by controlling the elastic deformation extent. The varied parameters at controlling the maximum elastic deformation are cutting forces, the attraction of the magnetic field of the machine table and rigidity of workpiece at a bend. The terms for providing of the required side surface flatness tolerance are determined for workpieces taking into account elastic deformation of the small-rigid workpieces under the magnetic field effect on the machine table and the radial component of the grinding force. Keywords: elastic deformations; small-rigid prismatic workpieces; flat grinding; quality of machined surface; process optimization.
Structural studies of surface-alloyed layers of the Cr-B4C system, formed on Ti-6Al-4V titanium alloy
Authors: Chuchkova L V , Belov A S , Lozkina E A , Khomyakov M N 
Published: January 2020

Abstract
The paper presents studies of the structure of surface-alloyed layers obtained by the method of non-vacuum electron-beam cladding of the Ti-Cr-B4C and Cr-B4C powder mixture systems. Structural analysis allowed to identify the dependence of the initial powder portion on the shape and size of the phases formed. It is noted that the presence of titanium (10 wt. %) in the composition of the surfacing mixture leads to the formation of large primary crystals of titanium carbide and boride. The absence of titanium contributes to the formation of chromium carbide coating and small eutectic particles on the grain boundaries on the surface.
The influence of volumetric electromechanical mandreling on the lead yield from the matrix material on the bronze bearing bushing surface
Authors: Morozov Alexander , Fedotov Gennady , Kundrotas Kyastutis 
Published: January 2020

Abstract
The data on the effect of electromechanical mandreling (EM) modes of rolled bushings made of Bronze-Tin-Zinc-Lead (BTZL) 4-4-2.5 on the lead yield from the matrix material to the work surface are given. As a result of an X-ray analysis, it was found that up to 13.3% of lead is eliminated from the matrix material to the bushing’s surface, filling all irregularities after machining, bringing the actual contact area to the contour one and significantly reducing contact stresses under loading, which serves as a reserve for increasing the movable joint’s durability, along with decreasing the friction torque in the joint when operating under ‘film’ starvation conditions.
Mechanical behavior investigation of constructional steels applied in amphibious all-terrain vehicle at different temperatures
Authors: Mishakin V V , Kurashkin K V , Gonchar A V 
Published: January 2020

Abstract
This article presents a comparative analysis of the mechanical properties of steel 20 (ASTM 1020) and steel 09G2S (ASTM A516 Gr 70) used in the construction of amphibious all-terrain machines developed for operation in the Arctic and Antarctic. Research included static tensile tests, hardness measurements, fracture toughness measurements, and fractographic studies. Experimental investigations were carried out in the temperature range from –60°C to +50°C. As a result of the studies, the express-method for assessing the material state according to hardness measurements is proposed.
Construction of elastoplastic shallow panels manufactured by stretching from sheet metal
Authors: Dedov N V , Isytkina V N 
Published: January 2020

Abstract
In the article, in a geometrically and physically nonlinear formulation, the problem of the stress-strain state of shallow shells on a rectangular plane under pressure loading is solved. The solving equations of the theory of flexible shallow shells are obtained on the basis of the Henki-Ilyushin deformation theory of plasticity and the equations of the geometrically non-linear theory of shells, which contain quadratic terms with respect to the angles of rotation of the normals to the median surface. The geometrical parameters of the median surface are taken in the initial undeformed state. The equations are written in a form that makes it possible to carry out numerical calculations of problems with allowance for geometric and physical nonlinearities or only with geometric nonlinearity, to take into account unloading, compressibility of the material and secondary plastic deformations. The results of numerical calculations of critical loads, unloading zones and secondary plastic deformations are presented. Recommendations are given on the choice of geometrical parameters when designing shallow shells.
Model of monitoring precision of technological processes based on principal component analysis
Authors: Seregin A , Kravtsov A 
Published: January 2020

Abstract
The article presents the results of theoretical and experimental research to improve the accuracy of machining of complex shapes on CNC machines. The proposed monitoring system improves the quality of operation of technological systems as a whole. A new analytical method for assessing the quality of products obtained on CNC machines is given. Monitoring consists of: evaluation of the accuracy and rigidity of the technological system of the machine; monitoring the state of the machine based on the analysis of technological accuracy of processing; control of accuracy of processing by adjusting the program for the CNC system and changing the processing modes.
Analytical support for effective functioning of intelligent manufacturing and transport systems
Authors: Kripak M N , Palkina E S , Seliverstov Ya A 
Published: January 2020

Abstract
The formation of the digital economy is one of the important priorities in the development of the information society. The article is devoted to the problem of improving the efficiency of the transport system, taking into account the development of industry based on implementation of digital technologies. The approach to the organization of the regional logistics center, assuming the division of space into clusters, has been presented. Two cases of the cluster model, depending on the size and number of clusters relative to the size of the city, have been examined. This forms the methodological basis for the construction of the functional architecture of the intelligent transport system.
Improving the accuracy of threading by optimizing the design of the tool
Authors: Nikitina I P , Polyakov A N 
Published: January 2020

Abstract
The paper presents the original design of a special tap for cutting precise threads. Distinctive design features of the tap are: the presence of the rear threaded guide, which together with the copier threaded sleeve of appliance perceives the axial forces and provides the tap axial feed strictly corresponding to the step of the thread being cut, excluding its breaking under the action of axial forces; the presence of a smooth front guide part with the direction on the cut hole, to reduce the influence of radial forces that lead to an increase in the diameter of the thread due to the radial vibrations of the tap; the presence of the chamfer that implements the most technological cutting scheme such as flank infeed. A prototype of a special tap made on a turning and milling machine tool is presented, confirming the manufacturability of the proposed tool design. Research conducted in the field of engineering analysis with the CAE-system Ansys showed a significant increase in structural rigidity, as well as a significant increase in natural frequencies.
Optimization of the structure of rolling stock of urban passenger transport
Authors: Bodrov Andrei , Lomakin Denis , Gagarin Ilia 
Published: January 2020

Abstract
This article examines the problems related to the operation of urban passenger transportation system in the field of defining the structure of the rolling stock, the analysis of existing methods of identification of the number and capacity of the urban vehicles has been conducted. The paper focuses on the results of experimental research of passenger flows and roominess, volumetric capability of a variety of transport means (public transportation minibuses) in the district municipalities of the Russian Federation. Furthermore, taking into account these results, differences and variety of these vehicle makes and models, the measures and activities have been suggested, aimed at improving the methods of selection of urban passenger transport rolling stock.
Hardening of weld with metastable austenite structure by surface deformation
Authors: Zverev Sergey , Korobov Iurii , Fiveyskiy Andrey 
Published: January 2020

Abstract
The study shows a technology comprising MIG deposition of cored wire like 50Cr18 with the subsequent surface deformation. Specially developed device realizes adjustable ball rolling load. The structure of the weld includes a large share of metastable austenite, which transforms to hard martensite at loading. The measuring shows that the technology provides an increase of the sample’s surface hardness from 40 HRC to 54 HRC and decrease it’s roughness from Ra 1,2 to Ra 0,4. The results allow using the technology applying to hydraulic pistons.
Optimization of cutting tool design by power and thermal parameters of machining process
Authors: Zhilyaev Anton , Kugultinov Sergey 
Published: January 2020

Abstract
The article presents the results of experimental studies to determine degree of influence angles of cutting wedge of end mill on force and thermal processes occurring in cutting zone. On the basis of the obtained data, the ways of reducing level of deformations thin-walled body parts made of aluminum alloys are considered. A comprehensive analysis of designation front angle of cutting tool was carried out in design at preproduction stage.
Ways to increase road train’s controllability and transverse stability
Authors: Baranov A S , Pavlyuk A S 
Published: January 2020

Abstract
The problem of controllability and transverse stability is quite urgent for the road trains in operation. There are two ways to improve these operational properties: the choice of rational design parameters of the train units and the use of special devices to improve controllability and transverse stability. As a criterion for assessing the controllability and transverse stability of a multi-unit road train, it is proposed to use a dynamic magnification factor. When calculating the dynamic gain factors, a linear mathematical model of a three-link road train was used, consisting of a three-axle tractor unit, a three-axle semi-trailer and a five-axle trailer with a two-axle dolly. The simulation model allowed to optimize a number of design parameters of this road train’s units. As a result of the optimization, it was found that the values of the dynamic magnification factor decrease with movement of the fifth wheel and towing hook forward (up to 20%), as well as increasing the length of the drawbar relative to the nominal position (up to 3%). These recommendations allow choosing rational characteristics of road trains and improving their design already at the design stage.
Experimental evaluation of profile passability of terrain vehicles
Authors: Klubnichkin V E , Klubnichkin E E , Evseev K B 
Published: January 2020

Abstract
The article presents the results of experimental evaluation of profile passability of the Russian- and foreign-made utility terrain vehicles (UTV).Russian-made UTVs RM 650-2, RM 800 (by JSC Russkaya Mekhanika), Stels 800 Guepard (by GC Velomotors). Foreign-made UTVs Yamaha Grizzly, BRP Outlander Max XT, BRP Outlander 6x6, Polaris Sportsman 1000. The tests to determine profile passability of the Russian and foreign UTVs were conducted for the following cases: 1) UTV climbing; 2) UTV downhill movement; 3) UTV aslope movement; 4) Trench crossing of an UTV; 5) Hole crossing of an UTV; 6) UTV crossing of a single irregularity in the form of a log.
Tool life estimation using acoustic emission signal
Authors: Khripunov N V , Vaskin K Y 
Published: January 2020

Abstract
A study was carried out on predicting the working life of a metal-cutting tool using an acoustic emission signal in comparison with predicting the working life of a metal-cutting tool based on the standard chemical and mechanical properties of the material being processed. A group of samples of six steels with a known chemical composition and mechanical properties was used as materials. Lifetime testing was carried out during milling with a single-blade cutter and the initial ranking of the steels according to their workability based on the relative intensity of wear rate of the tool was obtained. Acoustic emission signal reading was performed under similar processing conditions with determination of the integral energy characteristic of the RMS signal. During comparison of the relative hardness, the relative sulfur content and the relative RMS, it was found out that only for RMS there is correct compliance with the results of lifetime testing. The result obtained shows the effectiveness of the use of the acoustic emission signal for predicting the tool working life.
Heat - and Wear-Resistant Nanocomposite Material Based on Copper Powder for Valve Guides of High-Forced Engines
Authors: Vladimirova Y O , Shalunov E P 
Published: January 2020

Abstract
The article presents the results of the development of heat - and wear-resistant nanocomposite material based on copper powder Cu-Al-C-O system, which due to the optimally selected chemical composition and dispersion-strengthened structure with a strengthening phase γ-Al2O3 of nanodispersed range has a set of physical, mechanical and operational characteristics, at its level significantly higher than the similar characteristics of the standard bronze CuNi2Si F65 DIN 17666, used by a number of engine companies for the valve guides of powerful and high-forced internal combustion engines. In particular, the wear resistance coefficient for the valve guide made of this material is 17 times higher than for the guide made of this standard bronze. In this case, the coefficient of score-resistance of the bushings of the new material is 2.54 times higher than the same index for the bushings of bronze. Moreover, it also provides the least wear not only of the guide bushing but also of the valve, i.e. of the entire pairing as a whole.