bluuebunny/crossref_metadata_2025_split huggingface dataset:
Reliability-based topology optimization as effective strategy for additive manufacturing: Influence study of geometry uncertainty on resulting layouts
Authors: Kharmanda G , Antypas I R 
Published: November 2020

Abstract
The effectiveness of Additive Manufacturing (AM) is to fabricate very complex configurations that can be resulting layouts from topology optimization. The topology optimization can be classified into two models: Deterministic Topology Optimization (DTO) and Reliability-Based Topology Optimization (RBTO). The DTO may lead to unrealistic designs since it provides a single solution for a given design space. However, the RBTO is considered as a topology generator which provides several layouts. This way the designer can overcome the manufacturing constraint problems such as overhang, minimum feature size, anisotropy …, that may lead to a failure during the production process. Two RBTO strategies based on the Inverse Optimum Safety Factor (IOSF) are presented in this work: Objective-Based IOSF Approach and Performance-Based IOSF Approach. These approaches can be efficiently used as a topology regularization procedure. In addition, to consider the geometry uncertainty, different layouts can be obtained when increasing the reliability index values in order to provide more choices for designers. The geometry uncertainty is applied here in a manner to not affect the boundary conditions which can lead to change the structure’s functioning. The resulting RBTO layouts in this work, are too organic which leads to manufacturability problems. To use the conventional manufacturing procedures, classic CAD primitives must be used to simplify the geometry, that may lead to lose the optimality. Because of this manufacturability difficulty, AM is then obligatory. The RBTO being a good design tool for AM, paves the way to the next developments to overcome other fabrication constraints considering the reliability index values as a topology regulator.
Improving the selection methodology rational ways to restore parts when repairing machines
Authors: Leonov O A , Shkaruba N Zh , Vergazova Yu G , Golinitskiy P V 
Published: November 2020

Abstract
Features of quality assurance of production at machine-building enterprises of repair profile are considered. It is revealed that a large number of methods and means of restoring worn parts are used in the repair of machines − mechanical processing, surfacing and welding, metallization and spraying, electrolytic build-up, plastic deformation, and many others. A critical description of the existing theoretical positions on the choice of the most appropriate ways to restore details is presented. It is revealed that the existing methods are based on the criteria of manufacturability, durability and economy and consider the problem of whether it is appropriate to choose a particular method of restoration for only one part forming a joint. A model has been developed to optimize the cost of repairing parts that form a joint, taking into account both the cost of restoring each part and the cost of processing them. Calculations are made for a certain probability of failure and a given resource according to the criterion of the lowest total costs.
Quality assessment of spare parts for the final drive reduction gear used in the MTZ-82.1 tractors
Authors: Lazar V V , Skorokhodov D M , Kazantsev S P , Kataev Yu V , Sergeeva N A 
Published: November 2020

Abstract
The main machine repair problem and the main hidden defects are determined. The analysis of the protocols of the machine test stations showed that the greatest number of tractor failures occurs in the final drive gearboxes. To study their quality, such spare parts as the shaft, front axle half-shaft and the gear were selected. The main physical, mechanical and geometric parameters of the investigated spare parts, necessity and reasons for high quality control for qualitative production of spare parts are considered. Controlled geometric defects, methods and means of control of transmission spare parts are determined. Means of measurement for comparison of indicators and control accuracy are proposed.
Analysis of the wave phenomenon stability in network-like industrial constructions
Authors: Provotorov V V , Tkachova S A , Part A A , Volkova A S 
Published: November 2020

Abstract
Weak solutions of the initial boundary value problem for the second order hyperbolic equation with distributed parameters on an arbitrary oriented graph are considered. Weak solutions are determined by an integral identity, replacing the equation, the initial and boundary conditions. This indicates the spaces in which the search a weak solution is proposed, the conditions of weak solvability of such a problem and the consequent analysis of the stability of the solution are given. The central idea that defined all the content of the work is to apply the Fourier method to analysis evolutionary initial boundary value problems. Namely, the presentation of the solution in the form of a generalized series of Fourier, followed by an analysis of the convergence of this series and series, obtained by his one-time member differentiation. A essential role will play the system of generalized eigenfunctions and spectral characteristics of the elliptical operator of the hyperbolic equation. This considers homogeneous boundary conditions of the first genus (Dirichle conditions), the analysis of stability for the boundary conditions of the second and third genus is similar. The results are fundamental in the study of the control problems of oscillation of network-like industrial constructions, first of oll under studying the question of damping antenna constructions of different types.
Modeling the distribution of internal stresses in surface strengthened layer of steel parts after cementation and hardening
Authors: Rogovskii I L , Titova L L , Voinash S A , Sokolova V A , Pushkov Yu L , Krivonogova A S , Kokieva G E 
Published: November 2020

Abstract
Based on the analysis of existing trends in mechanical engineering, it is established that the complexity of modern gear parts imposes on the material increasing technological requirements for stamping, machinability, welding, hardenability, cementing and gouging in the hardening process, which explains the need for alloying, chemical elements. The influence of different compositions of steels for gears on the level of internal stresses that occur in the parts during heat treatment has been studied. The optimal composition of complex-alloyed cementing steel is established. Analysis of the results of modern research allows us to state that the residual stresses in the surface layers of steel parts after cementation and hardening may be appropriate. These are the cases when their direction of residual stresses is opposite to the direction of stresses that arise during the operation of steel parts. Complex alloying with titanium and niobium allows to increase manufacturability of steel and, as a result, to increase operational indicators of products of mechanical engineering of details. In the course of research, it was found that the level of grooving of parts in the process of chemical-thermal treatment will provide tolerances of 0.029 mm, steel 12Cr3Ni (minimum P and S) – 0.055 mm and is directly dependent on the level of internal stresses.
Influence of a 3D printer dynamic characteristics on building products printing accuracy
Authors: Emelyanov R T , Prokopev A P , Turysheva E S , Terehova I I , Pindur S V 
Published: November 2020

Abstract
The results of studying the dynamics of a construction 3D printer of manipulator type are considered. The analysis of the relevance of the 3D printing in road construction use, comparison of the technology with traditional methods of concrete structures construction is carried out. The choice of the investigated device type has been substantiated. A brief description of the construction 3D printer device, its element base and operating principle, illustrations of the research object and graphic materials are given. Forming without formwork using sliding formwork is considered, the mixture is compacted by the vibrator of the installation. A model of a construction 3D printer has been developed, which makes it possible to study the dynamic processes of interaction of the sliding formwork of the installation with a concrete mixture during construction products 3D printing. The temporal values of vibrations of the construction 3D printer trolley have been determined. The graphs of the oscillatory process of 3D printing and the time dependences of the electric current in the starting and operating modes were obtained.
Production chains configuration based on a systematic approach
Authors: Melamed N V , Sokolova V A , Iljushenko D A , Voinash S A , Alekseeva S V , Gogolevskii A S , Trepkova S A 
Published: November 2020

Abstract
The formalization of production tasks has been carried out, including the tasks of selecting individual links in the production chain (suppliers, carriers, warehouses) and choosing production chains based on the principles of a systematic approach. Hierarchical structures are constructed (basic criteria and alternatives are defined) for two classes of production problems of choice - the choice of a link in a production system and the choice of a configuration option for a production chain (network).As calculation methods, it is proposed to use methods for processing inaccurate pairwise comparisons to solve multi-criteria decision-making problems. An extension of the DS/AHP method is proposed in the paper. A new method for analyzing hierarchies to solve the problem of multi-criteria decision making using the Dempster-Scheifer theory differs from existing methods in that pairwise comparisons of elements, both at the level of alternatives and at the level of criteria, are replaced by the choice of the most preferred groups of elements. It takes into account the fact that the multi-criteria decision problem might have several levels of criteria. Moreover, it is assumed that expert judgments concerning the criteria are imprecise and incomplete. A numerical example explains in detail and illustrates the proposed approach.
Investigation of the linear shrinkage of photopolymer material during the technological preparation of the production of engine parts
Authors: Vdovin R A 
Published: November 2020

Abstract
The paper presents the results of the study of the effect of linear shrinkage on the geometric dimensions of products (samples) made by layer-by-layer application of a photopolymer material and subsequent curing with an ultraviolet source. This technology is becoming especially relevant in modern engine building, with the diversified nature of production. Also, the technology of layer-by-layer synthesis of a photopolymer material has found wide application in the manufacture of master models of gas turbine engine blades, since the blades have a developed spatial shape and increased requirements for geometric dimensions. The results presented in the work make it possible to estimate the value of linear shrinkage numerically for its further compensation during the technological preparation of production.
Air traffic control with prognosticated flight trajectory
Authors: Markelov V V , Shukalov A V , Zharinov I O , Zharinov O O , Kostishin M O 
Published: November 2020

Abstract
The satellite navigation and precision inertial system development quality leap provided a significant increase of the object position definition accuracy characteristics. This technology implementation in aviation led to possibility of flights in the given trajectory coordinates through a geodesy system without application of ground radio beacons to navigate. Of course, there is also a possibility to make a flight with a random route connecting airports of taking off and one of landing with optimal trajectory keeping in mind the limitations of air space restricted areas including sometimes the zone landscape. Logically to continue the transformation from the flights with radio beacons to navigate to the flights of so called zone navigation they need to form a given route and its sections connected to the way points with clearly defined geodesy system coordinates. So there is a possibility of accurate aircraft movement trajectory prognostication in a route and the prognostication of its navigation characteristics. There are some principles proposed of a control algorithm being applied during the aircraft movement in prognosticated navigation trajectories.
Determination of microrelief parameters of spherical parts processed by centerless grinding
Authors: Reshetnikova O P , Iznairov B M , Vasin A N , Davidenko O Y , Belousova N V , Semochkin G A 
Published: November 2020

Abstract
In the processing treatment of cleanoff and finishing operations of the parts with abrasive tools, very important tasks are both predicting their results depending on the assigned modes, and the appointment of modes depending on the required quality of the processed surfaces. In the article, the parameters of the microrelief formed as a result of centerless grinding of a complete sphere are determined analytically. The influence of the aging process on the formation of spherical surface roughness is determined. Calculations of the arithmetic mean deviation of the micro-profile of a spherical surface are given, depending on the number of working strokes of the grinding wheel.
The use of a heating element to combat soil freezing to the working bodies of machines
Authors: Zenkov S A , Dryupin P Yu 
Published: November 2020

Abstract
The development of wet cohesive soils at negative temperatures leads to soil freezing to the working bodies of earth-moving machines, which leads to a decrease in the useful volume of buckets and, consequently, to a decrease in the productivity of the machine. This article discusses the thermal effect on the simulator of the working body of an earth-moving machine. As a heat source, a tape heating element was used, namely, a carbon heating flexible tape. The technical characteristics of this heating tape and its technical device are presented. The results of experimental studies of the heating of the ladle simulator are presented and the temperature-time characteristics of the heating tape are constructed. The one-factor regression equations for the heating temperature of the bucket simulator at different ambient temperatures are presented. Research has been carried out on the effect of heating the bucket simulator by the heating tape belt on the soil shear force.
Mathematical model of the operating process of a mower for mowing vegetation in the near-trunk strip
Authors: Apazhev A K , Polishchuk E A 
Published: November 2020

Abstract
Due to the limited areas suitable for use for the agricultural production needs in the North Caucasus region, a promising direction is the development, for the cultivation of fruit crops, slope lands characterized by favourable soil and climatic conditions. At the same time, the most effective method of developing slope lands is terracing. Among the variety of different ways of maintaining soil in gardens, in terraced gardening, in order to minimize soil erosion processes, as well as provide plants with moisture and the required nutrients, a sod-humus system is used, which provides for mowing vegetation growing in the aisle and near-trunk strip for mulch. The design features of the terraces impose restrictions on the agricultural units working conditions, among the many of which it is necessary to highlight the possibility of approaching the row line for processing plants from only one side. The designs of mowers currently used in industrial horticulture, for the complete removal of vegetation from the near-trunk strip, require the passage of the unit along each side of the row line, which cannot be provided in terraced gardening conditions. Based on the foregoing, the development of a new design of a mower for mowing vegetation in the near-trunk strip, as well as in the zone of the near-trunk circle, which allows maintaining and increasing soil fertility on slope lands, is relevant in the conditions of mountain and foothill gardening in the Central part of the North Caucasus.
Mathematical modeling of the process of grinding grain materials
Authors: Mishkhozhev V Kh , Teshev A Sh , Kazdokhov Kh K , Kurmanova M K , Mishkhozhev Kan V , Mishkhozhev Kaz V 
Published: November 2020

Abstract
The problem of providing peasant (farmer) households with the means of production is currently very relevant, since the existing prototypes of equipment do not always satisfy both the necessary and sufficient conditions for its use. With small production volumes, it is rather difficult to ensure a high load factor and uniformity of high-performance equipment. High prices for energy resources in agricultural enterprises do not allow producers to reduce prices for their products, as a result, it negatively affects, first of all, consumers. Consequently, in the modern conditions of the functioning of peasant (farmer) farms, the development of new and improvement of existing means of mechanizing the production process, corresponding to the foundations and principles of resource conservation, comes to the fore. Among the means of mechanization for grinding grain materials, the most common are universal impact crushers with articulated hammers. They are able to grind various types of raw materials, are relatively simple in design and convenient in maintenance and operation. Their design allows easily changing wear parts (hammers, decks, grates). At the same time, modern designs have significant disadvantages such as the following ones: high metal consumption and energy consumption of installations, uneven grain size distribution with an increased content of dust particles, intensive wear of working bodies and the associated decrease in productivity and quality of material grinding.
Electrochemical behavior of 6xxx series aluminium alloys in electrolytes containing chloride ions
Authors: Dubova I V , Gilmanshina T R , Vasyunina N V , Sanacheva G S , Chupriy O V 
Published: November 2020

Abstract
The paper is devoted to the study of the behavior of aluminium alloy 6063 in solutions containing chloride ions. The corrosion rate was calculated by means of a gravimetric method, the dependence of the corrosion resistance on the concentration of electrolytes and the holding time was determined. The effect of corrosion on the ultimate strength of the alloy has been shown. The type of corrosion has been identified; the explanation has been given for the transition from pitting to intergranular corrosion due to the presence of intermetallics of iron and silicon Al3Fe and Mg2Si, which results in weakening strength. Recommendations for reducing corrosiveness have been given.
Reinforcement of cement mortar with alumina nanofibers
Authors: Dobrosmyslov S S , Peresypkin E V , Voronin A S , Fadeev Y V , Khartov S V 
Published: November 2020

Abstract
The article discusses the possibility of using alumina nanofibers to reinforcement cement mortar. Nanofiber is a twisted conglomerate, and its ultrasonic treatment in the water allows obtaining a stable dispersion. The research has been carried out on the effect of nanofibers on the viscosity of cement paste, as well as on the reinforcement of cement mortar. At concentrations less than 0,2%, there is no significant effect of nanofibers on the viscosity of the system. The studies were carried out on standard Portland cement at a water-cement ratio of 0.27. Reinforcement of cement mortar with aluminum oxide, with a concentration of 0 to 0.1%, does not give a significant change in the microstructure of the material. It was shown in the work that the use of nanofibers makes it possible to increase the strength of the system by 20% in compression and by 45% in bending.
Mechanical properties UHMWPE/alumina nanofibers nanocomposite
Authors: Kuular A A , Voronin A S , Markevich I A , Bermeshev T V , Simunin M M 
Published: November 2020

Abstract
We study the effect of a new dielectric filler – alumina nanofibers (ANF) on the mechanical properties of ultra-high molecular weight polyethelene (UHMWPE). It was shown that the combination of powder granules and alumina nanofibers in the process of solvent evaporation helps to distribute uniformly the powder particles over the surface. The effect of the process of mechanical activation on the mechanical properties of the UHMWPE/ANF nanocomposite was studied. Increasing the concentration of the ANF additive from 0.01 wt. % to 1 wt. % helps to uniformly increase the tensile strength and microhardness of the nanocomposites. It is shown that the addition of alumina nanofibers in an amount of 1 wt. % leads to a simultaneous increase in tensile strength by ∼42.5 % and microhardness by ∼71% in comparison with pure UHMWPE.
Simulation vertical sensing of the water environment hydrophysical fields
Authors: Savkova E O , Chengar O V , Shevchenko V I , Shumaieva O O 
Published: November 2020

Abstract
Classes of objects that form the information system structure for monitoring the water environment hydrophysical fields have been developed. Class descriptions include object parameters that affect the composition and operation of the system, and methods that define actions with class instances. Additional control classes are proposed for describing the interaction of objects and simulating the sensing process.
The influence of cryogenic treatment and subsequent annealing steps on the structural and phase state of 12Cr18Ni10Ti steel
Authors: Kozlova T A 
Published: November 2020

Abstract
The paper considers the effect of cryogenic treatment and subsequent annealing steps on structural, corrosion-resistant 12Cr18Ni10Ti steel. The microstructure of steel was studied and the reverse alpha-gamma transformation after cryogenic treatment and additional annealing was revealed. X-ray structural analysis the steel was carried out. As a result of dimpersed analysis in the structure of 12Cr18Ni10Ti steel large particle TiC, etching pits, high sulfur particle were found. Annealing led to the reverse alpha-gamma transformation. The formation of a grain recrystallized structure was found. An increase in the grain size after cryogenic treatment with a subsequent increase in the annealing temperature was recorded 12Cr18Ni10Ti steel.
Calibration of technological parameters of an electroadsorption apparatus with a fixed layer of adsorbent
Authors: Merentsov N A , Persidskiy A V , Topilin M V , Golovanchikov A B 
Published: November 2020

Abstract
This paper provides a program and algorithm for automated calibration of technological parameters of an electroadsorption apparatus with a fixed adsorbent layer. The basic physical principles that allow obtaining the necessary information about the ranges of regulation of the electric field parameters and the development of dynamics of filtration modes of the continuous gas phase flow through the adsorbent layer are described. The technological parameters obtained during calibration and their control ranges serve as the basis for implementing a program for controlling the operating modes of electroadsorption apparatuses during the current operation of technological equipment.