bluuebunny/crossref_metadata_2025 huggingface dataset:
Theoretical determination of effective drilling modes with epilamited tool
Authors: Zvyagina E A , Tkachenko A N , Selemeneva E M. , Cherepenko A A
Published: December 2020

The article is devoted to one of the promising methods of increasing the penetrating ability of COTS into the zone of contact interaction between a tool and a workpiece and accordingly increasing operational characteristics of tool life by applying to the working surface fluorine-containing surface-active (FLUOR-SAS) from epilame solutions. Tribological tests were carried out using a special installation, where the test conditions are close to the conditions characteristic of the drilling process. Based on the results of the experiment, it was found that the effectiveness of epilamiting directly depends on the cutting speed, which determines the temperature in the contact zone.
Improving the quality of surgical scalpels with ceramic blades
Authors: Alisin V V
Published: December 2020

The article discusses the issues of increasing resistance to brittle fracture of surgical scalpels with ceramic blades from nanostructured crystals of partially stabilized zirconium dioxide. The statement is substantiated that the strength properties of crystals can be increased by increasing the crack resistance of crystals by alloying with rare-earth elements. The kinetic microindentation method is used to study the characteristics of mechanical properties and crack resistance of samples of alloyed crystals. An assumption about the efficiency of alloying crystals with cobalt is substantiated. The bending strength test of promising crystal compositions is carried out. Based on the study, recommendations are formulated on the use of zirconium dioxide crystals for surgical scalpel blade manufacture.
Research accuracy of final formation profile of rolling ball bearings by various methods.
Authors: Reshetnikov M K , Davidenko O Y , Shpilev V V , Zakharchenko M Y
Published: December 2020

An important role in the further operation of rolling bearings is played by the shape of the grooves of the ball bearing rings. That is why it is necessary to pay special attention to the formation of their profile. To study the shape of the trough, we studied a batch of ball bearing rings using the method of measuring the size of the stamps. Since the bearing also works with small radial loads, it is necessary to press in not only at right angles. Additionally, we propose to strengthen the effect of indentation. From the experiments it can be seen that there is a different distribution of stresses along the contact area for bearings of the same size. Based on this, it can be argued that the accuracy of the machining process is insufficient. Therefore, there is a need to improve the accuracy of shaping the profile of ball bearing rings by advanced technologies. To do this, we propose to use imitation completion. After this procedure, after conducting experiments, one can again see how the characteristics of the raceway profile of ball bearings have qualitatively changed, and, accordingly, their durability.
Reducing the effect of centrifugal forces on the clamping force in the new design of a three-jaw lathe chuck
Authors: Legkiy N M
Published: December 2020

The article considers a simple and reliable design of a new three-jaw lathe chuck, characterized by high operational characteristics: high rotation speed, durability, calibrated clamping of products and a number of others. The abandonment of classical methods of construction enabled us to create a new effective design. In addition, this design only due to its principle, enables you to compensate for centrifugal forces at any rotational speed, and at the same time the lathe chuck has a standard size for installation on machines.
Use of high-intensity acoustic field exposure during the preparation of emulsion type drilling mud
Authors: Zhivaeva V V , Koval M E , Kapitonov V A
Published: December 2020

Existing methods of preparation of the oil based muds in laboratory conditions are reviewed in the article. Studies on the impact of a high intensity acoustic field exposure on the process parameters of drilling muds have been carried out in order to reduce the time of the water-in-oil emulsion preparation. The dependences of changes in the rheological characteristics and dispersability of the emulsion on the duration of its preparation are obtained. The authors also conducted an assessment of the stability of the oil based muds that are prepared using high-energy exposure after thermal aging under dynamic conditions (aging for 16 hours at a temperature of 80 °C in a roller oven with stirring at a speed of 25 rpm) and after 14 days in the state of rest.
The influence of rolling on the variation of unevenness parameters of the treated surface
Authors: Kurguzov S A , Suvorova E , Shestopalov E V , Krasnoperova I A
Published: December 2020

The paper studies the process of changing the elements of the surface roughness by lathe work in the course of the surface plastic deformation, or rolling. The results of the work allow enhancing the treatment technology and improving the quality of the machine elements.
Inelastic deformation of ceramics based on zirconium dioxide
Authors: Deryugin E E , Narkevich N A , Danilenko I A , Shmauder Z
Published: December 2020

The reasons for the nonlinear stage of deformation of two-cantilever specimens with a chevron notch under loading by the wedge method are investigated. Three main reasons are analyzed: plastic deformation, stable crack extension in the chevron notch zone, and t→m phase transformation induced by stress concentration. It is shown that the main reason for the inelastic behavior of ceramics is t→m transformation.
Features of the influence of process media of plant origin on power characteristics during cutting and quality of the processed surface
Authors: Dzhemalyadinov R , Skakun V , Vaniev E , Abdulkerimov I
Published: December 2020

In laboratory conditions, the influence of lubricating and cooling process media of plant origin on power characteristics of the cutting process and quality of processed surfaces during countersinking of structural materials with different chemical activity has been established. The use of methyl esters of rapeseed and sunflower oils fed using a minimized supply of lubricant, in comparison with base oils and traditionally used lubricants, is shown to reduce the roughness of the treated surface and the unit cutting work.
Selection and design of tools for finishing machining of seal grooves of hydraulic cylinders
Authors: Yatsun Elena , Zubkova Oksana , Karnaukhov Ivan
Published: December 2020

The most important operating performance parameters of machine components such as tightness, wear resistance, durability, and corrosion resistance largely depend on the state of their surface layer, determined by the parameters of machine processing during manufacturing. Selection of the technique for final machining of machine components is a rather difficult task, since, despite the large amount of information on technological support of the surface layer parameters, there are practically no recommendations on the quantitative estimates of the parameters of performance properties achieved in this case. Reliable functioning of hydraulic systems, their durability, and, consequently, reliable functioning and durability of the drilling rig, depend on the quality of the surface of the seal grooves. At present, turning is used for grooves machining, which in some cases does not provide the required quality indicators of the machined surface according to the surface roughness parameter. In this regard, an analysis of the possibilities of obtaining the required surface roughness using edge cutting machining techniques was conducted as well as other machining techniques ensuring uniformity of the surface roughness of seal grooves were analyzed. One of the promising processing techniques that can provide the required quality of the machined surface is a surface plastic deformation method. However, in order to use this method effectively, it is necessary to carry out an experimental study of the rolling process and determine processing conditions.
Reducing the porosity of AISI 6150 steel by hot isostatic pressing
Authors: Chkalov R V , Kochuev D A , Voznesenskaya A A , Vasilchenkova D G
Published: December 2020

The article presents the results of experimental studies obtained by hot isostatic pressing of AISI 6150 steel. The aim of the work was to reduce the number of pores formed in the material. The influence of the HIP process on structure of AISI 6150 steel samples is investigated by means of X-ray computed tomography. The results of the experiments show that the majority of pores can be successfully densified by means of HIP. The experiments presented in this work were carried out on the basis of a HIP system located at Vladimir State University.
The research of structural parameters, mechanical properties and efficiency of the cutting tool with multilayer coatings based on niobium nitride
Authors: Tabakov V , Chikhranov A , Dolzhenko Y , Vlasov S
Published: December 2020

The paper presents the results of studies phase composition, structure parameters, mechanical properties and crack resistance of multilayer coatings based on niobium nitride. The relationship of these characteristics with the coating design and the composition of functional layers is shown
Production of dense ceramics based on magnesium aluminate spinel with an evaporating additive
Authors: Kozlovskaya E A , Senina M O , Lemeshev D O
Published: December 2020

The influence of the evaporating additive on the properties of ceramics based on magnesium aluminate spinel obtained by high-temperature sintering in vacuum was investigated. The spinel precursor was obtained by chemical reverse co-precipitation, which after that was calcined at a temperature of 1200 °C. As an additive, boron oxide B2O3 was used in the concentration range of 5.0-7.0 wt.% Sintering of the samples was carried out at temperatures of 1700 and 1750 °C. Identified trends allowing to obtain the densest samples with minimal porosity.
Study of the particle size distribution of electroerosive materials obtained from waste alloys based on W-Ni-Fe in lighting kerosene
Authors: Ageev E V , Pereverzev A S , Selyutin V L
Published: December 2020

This article presents a study of the particle size distribution of electroerosive materials based on W-Ni-Fe alloy, obtained in lighting kerosene. It was found that the volumetric average particle diameter of the resulting electroerosion materials is 47,733 microns.
A review of carbon fiber materials in automotive industry
Authors: Ahmad H , Markina A A , Porotnikov M V , Ahmad F
Published: December 2020

In present scenario, light weighting becomes a main issue for energy efficiency in automotive industry. The emission of gases and fuel efficiency of vehicles are two important issues. The best way to improve the fuel efficiency is to decrease the weight of vehicle parts. Research and development played an important role in lightweight materials for decreasing cost, increasing ability to be recycled, enabling their integration into vehicles, and maximizing their fuel economy efficacy. There arises a need for developing a novel generation of materials that will combine both weight reduction and safety issues. The application of carbon fibre reinforced plastic material offers the best lightweight potential to realize lightweight concepts. Carbon fibre reinforced plastic has outstanding specific stiffness, specific strength, and fatigue properties compared to commonly used metals. In automotive industry, the advantages of carbon fibre reinforced plastic are reduction in weight, part integration and reduction, crashworthiness, durability, toughness, and aesthetic appealing. Carbon fibre reinforced plastic is a composite material that has been used extensively in various applications such as aerospace industry, sports equipment, oil and gas industry, and automotive industry. Keeping in view the aforementioned advantages of carbon fibre reinforced plastic, the authors have presented a brief review on carbon fibre for automotive industrial applications.
Thermodynamic substantiation of the conditions of metal adhesion in dry friction
Authors: Bulychev V V , Golubina S A
Published: December 2020

From the standpoint of thermodynamics, the conditions for the occurrence of adhesion and seizure in dry friction are considered. The setting of metals by friction is considered as a process of formation of a new phase in the form of points of adhesion. Dependences for the calculated estimation of the formation conditions of thermodynamically stable adhesion points are obtained
Numerical modeling of the problem of indentation of elastic and elastic-plastic massive bodies
Authors: Abirov R A , Khusanov B E , Sagdullaeva D A
Published: December 2020

The paper considers the dynamic pressing-in indenter in a plane elastic-plastic statement. A general statement of the problem of a rigid body under a flexible stamp pressing-in is given; it allows considering the elastic and plastic properties of the material and the process of the stress-strain state formation. The problem of a flexible stamp action on the outer boundary is realized using the finite-difference method. By solving the problem for a quadrangular profile, the distribution of the stress-strain state of the body under consideration and the formation of stresses over time are shown. The effect of plastic properties of the material on the stress state of the body is assessed by comparative analysis.
Physico-mechanical properties of VT6 titanium alloy after combined treatment
Authors: Luk’yanenko E V , Kurbatova I A , Yakutina S V
Published: December 2020

One of the directions in the technology is the use of thermal plasma for the production of new materials, as well as the modification of the surface of materials based on a titanium alloy using the action of a plasma jet. The use of pulsed high-speed jets today is one of the promising methods for producing new composite, high-alloy materials on the surface of products from structural materials. An analysis of the results shows that the most optimal is surface modification by high-intensity ion-beam treatment after plasma treatment with microfusion. This work was carried out as part of the state task of the Ministry of Science and Higher Education of the Russian Federation «The influence of magnetic fields and ion implantation on the structure, chemical composition and properties of titanium, aluminum alloys and elementary semiconductors».
Analysis of the properties of castings obtained by direct synthesis based on iron-containing industrial waste engineering
Authors: Bikulov R A
Published: December 2020

The production activity of large machine-building enterprises is associated with the formation of quite large quantities and a diverse range of waste, including a dispersed type, which pose a great problem for their involvement in the technological process, both because of their dispersion, and the presence of non-metallic inclusions and an oxidized form of existence of metal elements. The functioning of large metallurgical and machine-building companies leads to the formation of a large number of different man-made waste, which can be either in a coarse or fine state [1-7]. Processing of such man-made waste is quite difficult, since they are in an oxidized state. The technological process for utilization of iron-containing dispersed waste of mechanical engineering is proposed.
Experimental determination of interaction parameters in materials Fe-C-Al systems
Authors: Bikulov Rinat
Published: December 2020

Based on a sufficiently large amount of experimental data, the first-order interaction parameters for cast irons of the Fe-C-Al system are refined. The hyperbolic dependence of the first-order interaction parameters on the degree of saturation of cast iron with carbon is confirmede.
Method of increasing the fire resistance of wood
Authors: Gazizov A M , Popova E V , Kuznetsova O V , Akhmadullin A A
Published: December 2020

The use of impregnation based on soda ash and boric acid as one of the ways to increase the fire resistance of wood is considered. The method of testing the initial impregnation on three types of wood is described. The result of the tests was a justification for the use of this impregnation to increase the fire resistance of wood.
Influence of surface structures on torque of VT6 alloy cortical screws
Authors: Skvortsova S V , Spector V S , Sarychev S M , Orlov A A
Published: December 2020

The paper investigated the effect of the surface structure of VT6 alloy cortical screws after various modes of vacuum ion-plasma treatment on the magnitude of the torque when they are screwed and twisted into the threaded holes of titanium plates for bone osteosynthesis. It was shown that nitriding of the screw heads increases the surface hardness by 2 times, and the formation of the nitride layer-by 3 times. It was found that the maximum decrease in torque when unscrewing is observed for nitride coated screws.
Engineered nanomaterials for energy sector: market trends, modern applications and future prospects
Authors: Inshakova E , Inshakova A , Goncharov A
Published: December 2020

The article reveals key trends of the development of the global market for engineered nanomaterials and focuses attention on the energy related market segment based on the studies and generalization of recent analytical reports and research publications in this field. The authors substantiate rapid market growth of the energy related nanomaterials taking into account available proving their unique electrical, thermal, mechanical, optical and catalytic properties, and increasing patent activity in the field under consideration. These factors significantly expand the application prospects of energy related nanomaterials in generation, conversion, storage, saving and transmission of energy in the conventional and renewable energy systems. Within that framework, modern and future applications and growth prospects of mostly used nanomaterials in the global energy market (graphene, fullerenes involving carbon nanotubes, and other carbon nanostructures, materials with the nanolayer structures, metal oxide nanoparticles, and some others) and most recent nanomaterials in the market (aerographene / graphene aerogel, 3D and 4D-printed aerogels) are characterized.
Investigation of the influence of adding MWCNTS to an alkyd-urethane coating on the thermal conductivity coefficient of the coating
Authors: Eddin B E , Ali A J , Hadi J M , Tugolukov E N
Published: December 2020

In this study, the influence of adding MWCNTs to an alkyd-urethane coating has been studied on the thermal conductivity coefficient K of the coating, to determine its potential for use in solar water heating applications where the low value of the thermal conductivity coefficient of the polymeric coatings is an obstacle to their use as absorbent surfaces in solar collectors. A light source, a halogen lamp, was used as a heat source; the temperature measurement was done using an infrared thermometer. The results showed an enhancement in the thermal conductivity coefficient of 9.16% when it is added 4 % of the MWCNTs.
Synthesis of submicron titanium carbide in a direct current arc discharge plasma by a vacuumless method
Authors: Pak A Y , Gumovskaya A A
Published: December 2020

This paper studies the possibility of obtaining ultrafine cubic titanium carbide in the direct current arc discharge initiated between graphite electrodes in ambient air. According to X-ray diffraction data, there are 3 crystalline phases in the synthesized powder: graphite, initial titanium and cubic tungsten carbide. Based on transmission electron microscopy data, particles with sizes of 100-300 nm containing titanium and carbon are identified in the synthesis product. These objects are characterized by a structure corresponding to the cubic phase of titanium carbide. The applied vacuumless electrotechnical method is known for its ease of implementation, high productivity, and high energy efficiency in comparison with electrical analogues.
Analysis of boron carbide powder by high resolution transmission electron microscopy
Authors: Martynov R S , Vassilyeva Y Z , Mamontov G Y
Published: December 2020

We have reported the experimental results on analysis of a powder based on boron carbide. The powder was obtained by a non-vacuum electrical arc discharge method and analyzed by high resolution transmission electron microscopy. According to the results of analysis, boron carbide particles coated with a graphite-like carbon shell were identified in the powder, respectively, the particles are characterized by a core-shell structure.
Heat-resistant constructional materials based on thermoplastic polysulfones
Authors: Borodulin A S , Kallinikov A N , Storozhuk I P , Alekseev V M , Tereshkov A G
Published: December 2020

The analysis of achievements in the field of creating composite materials filled with fibers based on high performance thermoplastics, as well as methods for producing prepregs based on activated unidirectional carbon fibers in form of layers and synthesized specifically for that purpose polyethersulfone based on 4,4’-dioxidiphenylsulfone and 4,4’-dichlodiphenylsulfone with an optimal molecular weight was conducted.
Deformation and strength properties of silicone magnetoactive elastomers
Authors: Valiev H H , Astakhov K N , Ja Minaev A , Stepanov G V
Published: December 2020

New elastomeric silicone composites with ferromagnetic fillers have been synthesized. The deformation and strength properties of these magnetoactive elastomers in compression with additional imposition of an external magnetic field have been studied. The influence of a filler microparticles restructuring in external magnetic fields, established earlier by means of atomic force microscopy, on the complex of properties of these composites is discussed. The prospects of creating new materials and devices based on the characteristics of such magnetoactive elastomers have been revealed.
Decision-making support when determining the heating systems parameters for hydraulic presses
Authors: Karpushkin S V , Mokrozub V G , Malygin E N , Karpov S V
Published: December 2020

The problem formulation for decision-making support during determining the parameters of the heating systems for hydraulic presses and its decomposition, based on the optimization problem of elements of the heating system, mathematical models of the functioning of the heating systems elements of hydraulic presses, is proposed. The structure of the decision-making support system for the parameters determination of the heating systems of hydraulic presses, the functions of its elements, information flows between them is determined. The information models for the information storage and processing on the initial data and the results of solved problems are developed.
Expanding the field of applied research of CAD / CAM / CAE technologies through ethnographic museology
Authors: Trushkova I Yu , Grachev S P , Flaksman A L , Prigarin A A
Published: December 2020

Russian regional studies on the frontier of technical and humanitarian sciences demonstrate specific directions of digitalization of the ethnographic museum space. The need for improving the socio-cultural environment in the constituent entities of the Russian Federation, solving IT problems of local museums, processing significant amounts of ethnocultural information determine the areas of joint - engineering and ethnographic - scientific research. The experience of these works at Vyatka State University has been gained in recent decades. The sources for such scientific activity are the collections of ethnographic expeditions of the university since 2003. They include material and written sources. There are ethnographic and engineering (digital) data processing methods, specific museum work techniques among the research methods. Specific areas are the digital presentation of specific ethnographic objects, the development of virtual expositions and exhibitions, the creation of a virtual ethnographic museum / scansen, the study of electronic “feedback” with visitors, the creation of an ethnographic data bank for funds. The article provides a specific set of software products. Elements of specific algorithms for applying the IT product for the main types of museum activity — scientific research, exposition, stock work, and contacts with visitors — are shown. The practical value of the considered joint border scientific research for modern regional communities is obvious. The beneficiaries of the results are the student and teaching communities in universities, the fields of culture, education, tourism, civil society, and law enforcement agencies. A special effect of cyber ethnography is the remote use of ethnocultural heritage in museums.
A knowledge base model of the computer-aided design system for solids of revolution press-forging
Authors: Kanyukov S I , Konovalov A V , Muizemnek O Ju
Published: December 2020

The main problem of creating computer-aided design systems (CAD) for press-forging processes is associated with a weak formalization of the subject area. An effective way for solving this problem is to provide the corresponding CAD with expert system properties when weakly structured knowledge is formalized in a certain way and transferred to the knowledge base. The paper describes the concept of developing a production knowledge base model of the computer-aided design system for solids of revolution press-forging. Some specific technological problems are examples of this model application in relation to tasks with point and interval solutions. The proposed concept of developing the knowledge base allows us to more formalize the subject area under consideration, to develop genetic algorithms for solving weakly structured problems of computer-aided forging process design, to ensure the work of appropriate programs without their adjustment to changing production conditions, and it can be used in other subject areas.
Design and modeling of new technologies with advanced morphological approach as CAI method
Authors: Rakov D L
Published: December 2020

Innovation processes are highly dynamic and competitive. Their effectiveness depends on the speed of reaction to changes in the market and economic situation. Therefore, there is a need for a comprehensive software to support the innovation process throughout the product life cycle. The latest tendency in design research show that great efforts are being made to implementation of CAI (Computer Aided Innovations) as part of CADx systems. This paper presents and discusses a heuristic discursive Advanced Morphological Approach (AMA) for solving the design problems on conceptual stage in uncertain conditions. This approach allows you to search for innovative solutions at the early design stages, form variant clusters, generate a variety of sub-optimal variants, choose the most rational alternatives and compare them. It is based on the provisions of the system, cluster analysis and morphological methods.
Excitation of waves by a high-speed source moving along the border gradient-elastic half-space
Authors: Antonov A M , Erofeev V I , Malkhanov A O
Published: December 2020

Within the framework of the mathematical model of the gradient-elastic continuum, i.e. medium, the stress-strain state of which is described by the strain tensor, the second displacement vector gradients, the asymmetric stress tensor and the moment stress tensor, the problem of generating disturbances by a moving source is considered. It is assumed that the source moves at a constant speed along the boundary of half-space. The problem is considered in a two-dimensional formulation, when all processes are homogeneous along the horizontal transverse coordinate axis.
Impact of technological errors of design parameters of broadband radio signals mixer based on resonant-tunneling diode on its electrical characteristics
Authors: Cherkasov K V , Meshkov S A , Makeev M O , Shashurin V D
Published: December 2020

The research object is a resonant-tunneling diode based broadband radio signals mixer (RTD BM) of 4-8 GHz range. The purpose of this research is to perform statistical analysis of the RTD BM design parameters’ technological variation impact on its electrical characteristics’ variation. RTD BM’s electrical characteristics variations under the impact of its nonlinear elements’ I-V characteristics, topology parameters and substrate thickness, and relative permittivity technological errors, as well as under their combined impact, were obtained. The ranking of the considered RTD BM’s parameters technological variations’ contribution to its electrical characteristics’ distributions was carried out. It was revealed that the biggest contribution to RTD BM’s electrical characteristics’ distribution is made by the technical errors of its nonlinear elements’ I-V characteristics. RTD BM’s electrical characteristics distributions under all design parameters’ technological errors combined influence can be used in RTD BMs’ batch reliability analysis performed by computer statistical experiment means.
Modelling attacks in self-organizing wireless sensor networks of smart cities
Authors: Meleshko A V , Desnitsky V A , Kotenko I V
Published: December 2020

Nowadays self-organizing wireless sensor networks for solving the problems of arranging operational processes in smart city systems are becoming rapidly developed and widespread. Such networks are used to collect and aggregate data from physical sensors of devices as well as for its processing and transmission over the network in conditions of time-varying loading characteristics of the communication channels, changing location of devices and their operating modes. The paper discloses an approach to modeling and analysis of attacks aimed at compromising devices, data and services of smart city systems built on the basis of self-organizing wireless sensor networks.
Modeling traffic streams on a road network section
Authors: Kushchenko L E , Kushchenko S V , Novikov A N , Novikov I A
Published: December 2020

The paper considers the issues of modeling traffic flows. Statistical data on the number of vehicles accumulating in front of the stop line for red lights are collected and analyzed, thereby determining the length of the queue of the traffic stream. The degree of influence of the driver’s reaction time on determining the average speed of the traffic stream on the road network of the city of Belgorod is considered. A fuzzy inference model based on the main parameters of the traffic stream is developed. A rule base is formulated that enables one to determine the average speed of traffic stream depending on the parameters of the traffic stream. The established dependence can be used when programming the controller or hardware implementation of the corresponding fuzzy control algorithm in the form of a decision table.
Sampling method for evaluation and control of industrial product quality
Authors: Lukina S V , Makarov V M , Ovchinnikov S A , Zimovets O E
Published: December 2020

The article develops a sampling method to control and evaluate the quality of industrial products. The method allows for a comprehensive quality evaluation at designing and controlling industrial product manufacture. The method is based on a set of mathematical and statistical models of forming a sampling frame of industrial product parameters. It takes into account the factors of the company’s external and internal environment, control over decision making process (DMP), quality evaluation by a sum of partial indicators of ten groups. The method developed is automated with the help of the software MathCad Prime. The industrial approbation of the method showed its efficiency for the solution of production tasks related to the evaluation and control of industrial product quality at various stages of product and manufacturing life cycles.
Implementation of a probabilistic subtractor based on a probabilistic adder
Authors: Moiseev D V
Published: December 2020

The paper provides basic mathematical calculations for performing arithmetic operations of addition and subtraction on operands represented as a non-positional probability mapping. The probabilistic form of presentation and transformation of information has undeniable advantages over the “classical” digital, which consist in reducing the hardware volume and increasing the performance of computing devices. A method for the implementation of probabilistic subtraction through probabilistic addition is proposed. A simulation was carried out, confirming the theoretical presentation.
The use of CAD when designing forest machines
Authors: Dolmatov S N , Kolesnikov P G
Published: December 2020

Wheeled forest skidders - pack pickers are widely used by logging enterprises. However, such vehicles have insufficient maneuverability. Therefore, development of tracked pack pickers is an urgent task of forest machine building. When designing such machines, it is required to ensure high reliability and durability of the structure for operating in hot and cold climates, poorly maintained roads or their absence. It is also necessary to fulfill the condition of sufficient strength and minimum weight of technological equipment and the machine as a whole. The use of computer-aided design (CAD) systems makes it possible to realize these conflicting requirements. In the process of research in Altair Inspire CAD system, a constructive element of the technological equipment of the tracked skidder is developed. The use of the finite element method makes it possible to ensure the strength of the structure. As a result of topological optimization of Altair Inspire, the design weight of the projected element is reduced by 45% compared to the weight of the prototype machine. Reducing the mass of the structure does not have a negative effect on the strength indicators. The required standard safety factors, operating stresses and deformations of the structure are provided.
Implementation of an enlarged block of design procedures for the analysis of requirements for the assembly of high-precision products
Authors: Nazaryev A , Bochkarev P
Published: December 2020

The article considers the issue of improving methodological, mathematical and algorithmic support for the implementation of an enlarged block of design procedures of the analysis of a high-precision assembly unit and the requirements of its assembly of the of the system of accounting requirements for the assembly in the design of manufacturing methods of machining. The proposed improvements will make it possible to more efficiently perform design dimensional analysis of a high-precision assembly unit in an automated mode and choose rational manufacturing methods of machining of parts during process design of the production of multi-nomenclature machine building complexes.
Reconstruction of thermo-physical properties to improve material database for casting simulation
Authors: Ogorodnikova O M , Yeltsin S V , Martynenko S V
Published: December 2020

In this work, an advanced method is proposed for computational recovery of thermo-physical properties in a wide range from room temperature to values above the alloy melting point. This method allows us to improve material databases of CAE (Computer-Aided Engineering) programs for simulation of high-temperature technological processes. In most cases, computation of unsteady temperature fields is an important stage of CAE analysis in mechanical engineering. Moreover, various manufacturing technologies such as casting, welding, surface hardening, coating, heat treatment provide the desired material structure and its strength by controlling temperature field during solidification and subsequent cooling of a machine part. The problem of reliability in computer modeling arises from the fact that CAE programs usually are not equipped with comprehensive material databases. We have solved this problem especially for casting simulation and molding materials, which can differ in composition at different plants and therefore cannot be combined into a common database. To determine unknown thermo-physical properties, the temperature had been measured in several points of solidifying cylindrical sample initially, and the appropriate computer simulation of the test technology was performed. Then the difference between the calculated and experimental temperatures was minimized using the modified Levenberg-Marquardt optimization algorithm.
A model for detecting vulnerabilities in UMV interfaces, based on probabilistic automata
Authors: Skatkov A V , Bryukhovetskiy A A , Moiseev D V
Published: December 2020

The main features associated with the development and research of methods of adaptive intelligent technology for monitoring the state of objects of computer systems are considered. The proposed approach is focused on detecting moments of change in the state of controlled UMV resources, which are: communication channel, processor, memory. The aim of this work is to develop an adaptive model using a Bayesian classifier for estimating the state of UMV resources. The model is based on a probabilistic automaton with parametric self-tuning.
System for dynamic synthesis of differential equations of mobile machines motion
Authors: Baranov A S , Pavlyuk A S
Published: December 2020

The process of creating the calculation model structure of mobile machines of arbitrary configuration is formalized. An algorithm for dynamic synthesis of motion equations according to the calculation model is created, which enables to automate the development of differential equations of motion without the participation of a researcher. The method of displaying simulation results using a database of graphic elements based on raster images is substantiated. Based on the object approach, all stages from the development of the flowchart to the obtaining of the final simulation result are combined into a complete algorithm.
Improving simulation adequacy of production processes by jointly applying the planned and situational reservation logic of jobs in the machine parts manufacturing batch
Authors: Grigoriev S N , Dolgov V A , Leonov A A
Published: December 2020

The logic of setting priorities for a workstation reservation is proposed. The workstation reservations need for machining operations of manufacturing a production parts batch. Examples of planned reservation of workstation at the manufacture of batch parts with different technological cycles are considered. It is shown that the comprehensive application in simulation modelling of situational logic and the logic of planned reservation of workplaces can significantly increase the appropriateness of the simulation production processes.
Calculation of the complex of virtual surface roughness parameters obtained in the simulation geometric grinding model
Authors: Shipulin L V , Pavlov S A , Nesteruk E V
Published: December 2020

At the final operations of manufacturing parts, grinding processes are applied that ensure the achievement of high accuracy of the product and low roughness of its surfaces. A promising area for studying the parameters of surface roughness obtained by grinding is a virtual relief surface simulation. A brief review of geometric models of various researchers is given. In the previously developed simulation geometric model, a virtual relief surface is formed after grinding. The urgent task is to determine the roughness parameters from the existing profile, although all the initial data for this are available. The development of an algorithm and a software module, as well as a set of solutions for calculating the roughness parameters of a virtual relief surface obtained in a simulation geometric model, is considered. In the algorithms, the middle line is constructed, the arithmetic mean deviation of the profile Ra is calculated, all maxima and minima of the profilogram chart are determined, five maxima and five minima are selected, the parameter Rz is calculated, the parameter Rmax is calculated, the profile reference length tp is determined for twelve levels of line p, the intersection points of the profile and the middle line are determined and the parameter of the average pitch of roughness Sm is calculated, all the protrusions on the profilogram are determined and the average pitch of local protrusions S is calculated. Implementation of the presented algorithm, including all the above actions, in the object-oriented programming language C# in the Visual Studio C# software product enabled us to obtain software that can calculate all basic roughness parameters, such as Ra, Rz, Rmax, tp, Sm and S according to the virtual surface from the geometric model.
Study of feedwater regenerative heating operating modes at reduced loads of a turbogenerator by 300 MW power unit capacity
Authors: Limar Aleksandr , Babushkin Aleksey , Kinash Ludmila , Malykov Aleksey , Naginaev Kirill
Published: December 2020

The article presents the results of numerical studies and analysis of the feedwater regenerative heating operating modes depending on power unit capacity. The main parameters of this system are the enthalpy of the turbine steam extraction for heaters, as well as the steam consumption in these extractions. The dependences of the turbine unit steam flow rate and the change in expansion process of the steam turbine during the load regulation were investigated. The mathematical model of calculation the thermal power plant for a 300 MW power unit capacity was developed. Following on the results of the calculation conclusions of feed water regenerative heating operating modes at reduced loads of a turbine-generator for a 300 MW unit.
Model of selective assembly process of rod-piston group parts of internal combustion engines
Authors: Filipovich O V , Balakin A I , Balakina N A
Published: December 2020

Functioning of conrod-piston group of internal combustion engine is considered. It is shown that the main method of assembly of this unit is selective assembly, which provides the required accuracy of parts joints. The scheme of the assembly set-making is given, a mathematical model of the process of its selective assembly with the selected strategy is built. As a strategy, a single-variant set-making is proposed, in which the assembly is carried out from the groups of the same numbers. The constructed model allows to determine the process indicators, in particular, the probability of obtaining suitable assembled sets, the probability of incomplete elements, forming work in progress and preliminary scrappage. The task of optimal assembly of rod-piston group at specified values of extended tolerances and arrangement of tolerance intervals by rational selection of boundaries of selective groups is set. The solution of this task is given.
The estimation of dynamical condition of vibration technological machines at joint action of two external disturbances
Authors: Bolshakov R S , Sitov I S
Published: December 2020

The introduction of additional elastic elements into the structure of a vibrating technological machine is considered. The design scheme of a vibrating machine is a mechanical oscillating system with a rigid body on elastic supports. A method for creature mathematical models of technical objects is offered, which makes it possible to evaluate their dynamic state with the introduction of additional ties. For a more detailed analysis of the properties of the system, structural mathematical modeling methods are used. The essence of such approaches is the equivalent of replacing the initial design scheme of a vibrating technological machine with a dynamically equivalent analogue, which is a structural scheme of an automatic control system. It is shown that with the asymmetric introduction of additional elastic elements, it is necessary to develop special methods for the analysis of dynamic stiffnesses. Taking into account the combined action of external force influences shows the possibility of manifestation of new dynamic effects associated with the regimes of dynamic absorbtion of oscillations and the influence of inter-partial ties. Based on the studies and the obtained analytical ratios, a methodological basis for the dynamic synthesis of the parameters of mechanical vibrational systems with the ability to control and control the dynamic state of the working bodies of vibrating technological machines has been developed.
Linear theory of the structure of mechanisms
Authors: Kuznetsov S A
Published: December 2020

Structure analysis contains the definition of two structural characteristics, the one being the degree of abnormality in structure, which defines the balance of mobilities and structural bonds along the contour line of kinematic chain, and the other being the degree of irrationality, which defines balance of transverse mobilities and structural bonds; in combination they make structural equations of bonds and can be applied for structure analysis of plain and spatial mechanisms. Linear approach is also used to define the class of contour and whole mechanism because it shows the quantity of dimensions lacking for construction of the contour while binding the structural characteristics with the method of the following kinematic research: class of a contour is defined by the nonnegative value of the degree of its abnormality, while the class of a mechanism – by the algebraic sum of classes of the contours.
Features of determining the efficiency of the cam wave generator of the wave gear
Authors: Lyuminarsky S E , Lyuminarsky I E , Lyuminarskaya E S
Published: December 2020

The object of study is a wave gear with a cam wave generator. One of the requirements for wave gears is to increase their efficiency. The article considers a refined method for determining the efficiency of a flexible bearing, taking into account the deformation of the flexible wheel, hard wheel, outer ring of the flexible bearing, cam shaft, shaft of the flexible wheel, as well as contact deformations of teeth, FB balls, roller paths of the outer and inner rings of the flexible bearing. According to the proposed method, the influence of the resistance moment, gear wheel displacement coefficients and radial deformation of a flexible wheel on the efficiency of a flexible bearing is investigated. The obtained dependencies expand knowledge about the influence of various factors of wave transmission of the efficiency of flexible bearings.
Effective design features of rotor shafts
Authors: Kondratenko V E , Sedykh L V , Surkova R Y
Published: December 2020

An important technological progress factor in mechanical engineering is improving structural and process solutions to production problems. The paper suggests a rational method of designs for hard shafts operating in a subcritical region, and for flexible shafts operating in a supercritical region.
Probability calculation applied to potential failure zones of the bridge girder of metallurgical crane
Authors: Izvekov Yu A , Dubrovsky V V , Stupak A A
Published: December 2020

This article addresses the examination of potential failure zones of metallurgical casting crane with 300 ton lifting capacity. Complex system of static loading applied to a 24-meter long and 3-meter high girder was regarded as the object of examination. Girder components were manufactured from steel Bст3сп5. Calculation was first performed using the “LIRA-SAPR” automatic design system to obtain the actual stresses and displacements. Probability density for limit and safe actual stresses was then built based on previously conducted research and simulation. It was established that further operation under such loads could result in a failure. After analyzing the level of loading applied to the crane girder components and assemblies, the decision was made to reinforce them with a truss bar. The recalculation demonstrated that such decision was adequate and that the crane could be further operated without failure. The presented information can be used in the technology related to extending the service life of metallurgical cranes most of which are operated after the expiry of their warranty period.