bluuebunny/crossref_metadata_2025_split huggingface dataset:
Development the engineering analysis system of mechanical processing technology and assembly for the parts like axially symmetrical bodies
Authors: Masyagin V B , Bazhenov R I , Primak D D 
Published: January 2020

Abstract
The problem of developing an engineering analysis system for modeling technological processes of machining and assembly and carrying out dimensional analysis has been considered. The purpose of creating the system, the tasks was formulated, the objects was selected. The general principles of the system design, the data structure, the software, and functioning of the engineering analysis system of mechanical processing technology and assembly has been proposed. Software modules allow you to perform modeling procedures for technological processes of machining and assembly, dimensional analysis of structures and technological processes of machining, products visualization, parts, workpiece, technological processes of machining and assembly. The system functioning is possible in the analysis modes of existing technological processes and synthesis of new technological processes of machining and assembly. A set of techniques, mathematical models, algorithms underlie of system building has been listed. It is noted that the developed system of engineering analysis provides an increase the efficiency of products design and technological processes of machining and assembly in terms of ensuring accuracy. The possible directions of further development of the system has been indicated.
Revisiting the adjustable mode of a locomotive startup to ensure the best use of the clutch
Authors: Keropyan A M , Babichev Yu Ye , Sizin P Ye 
Published: January 2020

Abstract
It is known that a locomotive startup process usually consists of two consecutive phases (initial and final). From the point of view of the adhesive force implementation, it is important how the driving force changes during each of the startup phases and what the length of each phase is. The law of distribution of the realized values of the adhesion coefficient and the use of adhesive force depend on the law of change in the startup driving force we use to approach the limit of adhesion. The choice of the startup mode can be crucial in the most heavy-duty mode of the locomotive – when starting-up and setting the train in operation. As a result of the conducted research, it was established that immediately after the motion onset, acceleration should not exceed 0.5% of the maximum possible for these conditions. It means that in the first sampling interval (up to approximately 5% of the starting duration), the driving effort must be sufficiently small, namely, F = 0,005·Fmax. Then, it must slowly increase to about 15–20% of the starting duration over each sampling interval. It is established that in the startup mode with the proposed step-by-step method of controlling the driving force, the speed of the locomotive almost completely coincides with its corresponding speed during continuous adjustment. Deviation makes up not more than 2-3%. It can be explained by the inertia of the wheelset drive of the locomotive, which will not lead to clutch stalling and wheel slipping.
Three-dimensional of modeling microgeometry of contact pairs in technical systems
Authors: Bykov L , Ezhov A 
Published: January 2020

Abstract
In this work, the technique of numerical simulation of the characteristics of contact pairs in technical systems is considered. The technique is based on the use of microgeometry parameters of the contacting surfaces. Based on the measurements of the surface roughness profile, the microgeometry parameters of the surfaces are determined. The technique described in the article allows to obtain a clear picture of the actual contact spots formation of the contacting surfaces, the size and volume of the intercontact area, the distribution of fields of equivalent stresses and temperatures in the contact pair.
Eigenfrequency spectrum analysis of bending vibrations for naturally swirled rod
Authors: Pavlov V P , Kudoyarova V M , Nusratullina L R 
Published: January 2020

Abstract
The paper presents a numerical method for calculation of eigenfrequency vibration for naturally twisted rod considered as a first approximation model of a real blade of a gas turbine engine (GTE). The proposed method is based on the method of a fifth-degree spline developed by the authors. This method makes possible to solve fourth-order differential equations very accurately that arising in problems of transverse vibrations of rods. These research are focused on studying the more complex vibration process of a rod's spatial bending unlike the known works where bending vibrations are considered only in a single plane.
Final and element modeling of workpiece temperature at the combined grinding
Authors: Gusev Vladimir G , Morozov Alexey V , Sobolkova Elizabeth V 
Published: January 2020

Abstract
The combined grinding is characterized by simultaneous preliminary and final machining of workpiece on one machine tool without replacement a coarse-grained on a fine-grained grinding wheel, that allows to reduce the main and auxiliary time for performance of technological operation, and, therefore, to increase grinding process productivity. Entry and boundary conditions of computer modeling of the maximum temperature of the processed surface at the combined and traditional grinding are defined. Modeling of surface temperature is carried out in the modern Solid Works software product for simultaneous grinding by wheels with various characteristic of abrasive material, what in scientific-technical literature was not considered earlier. Models of the maximum temperature of the processed surface in a function of removed overmeasure, longitudinal and cross-feed of workpiece, on the basis of which the cutting regime of the combined flat peripheral grinding, providing elimination of thermal damage of the processed blanket, is appointed are established.
Improving the performance properties of titanium alloy VT6 after ion implantation with copper and aluminum ions
Authors: Ovchinnikov V V , Lukyanenko E V , Yakutina S V 
Published: January 2020

Abstract
The objective of this work was to study the processes occurring on the surface of VT6 titanium alloy samples when implanting with copper and aluminum ions. Elemental composition, structural-phase state, mechanical and tribological properties of VT6 titanium alloy surface layers modified by aluminum and copper ions was being researched. As can be seen from the undertaken studies, the mode of high-intensity ion-implantation process makes it possible to obtain ion doped surface layers of VT6 alloy containing finely dispersed intermetallic phases and a solid solution of aluminum and copper in titanium of a composition varying in depth. The thickness of the ion-doped layer, the average grain size of the intermetallic phases and their conglomerates increases with the increase in implantation dose while aluminum implantation is in progress. It has been shown that the implantation of aluminum and copper ions into VT6 alloy leads to a considerable increase in its microhardness and wearability. Based on the research results, a conclusion on the positive effect of a structural-phase state of ion-doped titanium layers on their mechanical and tribological properties of VT6 titanium alloy has been drawn.
The structural and texture analysis of titanium alloy Ti-6Al-4V samples obtained by direct metal deposition
Authors: Scvortsova S V , German M A , Grushin I A 
Published: January 2020

Abstract
The paper presents the results of structure and texture formation study in Ti-6Al-4V alloy samples, obtained by Direct Metal Deposition technology of additive manufacturing. The effect of annealing on the formation of the structure and texture in 3D-samples was investigated. It is shown that the samples have a two-phase structure of “basket weaving” in the initial state and after annealing. It is established that the samples have significant anisotropy of properties in two mutually perpendicular directions that could be explained by the presence of the crystallographic texture.
The correlation among chemical composition, structure and mechanical properties in titanium alloys for the elements with increased dynamic ability
Authors: Gvozdeva O N , Shalin A V , Stepushin A S 
Published: January 2020

Abstract
This article contains the comparison of physical and mechanical properties of several titanium alloys. The chemical composition influence on mechanical properties is investigated. VT22I and VT35 highly alloyed titanium alloys are the most prominent materials for armor elements production with ultimate tensile strength of 1200-1400 MPa and impact strength of 0,25-0,3 MJ/m2.
Basic approaches to programming by demonstration for an anthropomorphic robot
Authors: Alchakov V , Kramar V , Larionenko A 
Published: January 2020

Abstract
The article is devoted to the consideration of the issue of building intelligent control of manipulators of an anthropomorphic robot. The paper considers the approach of transmitting data when building management through training with a teacher using a copying suit. The structure of the knowledge base for building management has been considered. The proposed approach is an effective alternative to building control through solving complex systems of differential and finite-difference equations of a high order, which do not always take into account all the features of the functioning of manipulators in various environments.
Modification of the cement stone active silm of urban treatment facilities
Authors: Romanenko I I , Romanenko M I , Petrovnina I N 
Published: January 2020

Abstract
The use of recycled sludge from wastewater and products based on it in concrete is caused by an increase in the production of activated sludge in cities of millions and the restriction of free land for its disposal. The main components of activated sludge and fiber are SiO2, CaO, Al2O3, Fe2O3, MgO and P2O5, which allow the pozzolanic mechanism to manifest itself in a hardening cement matrix. Thus, activated sludge and fiber can be used as a modifier of the structure of hardening concrete. The use of municipal wastewater treatment plants in the production of building materials reduces the cost of waste disposal, social tension and solve problems related to environmental protection.
Method of studying the dynamics of the controlled mechanical continuously variable transmission with an elastic element and one-way clutch.
Authors: Derzhansky V B , Cherepanov S V , Volkov A A 
Published: January 2020

Abstract
In comparison with other types of transmissions currently used, mechanical continuously variable transmissions are capable of providing significant technical and economic advantages, which makes research in this area relevant. This paper presents a mechanical and mathematical method that allows for studying the dynamic processes that take place during operating a controlled mechanical continuously variable transmission with an elastic element and a one-way clutch which provides for transmitting torque to the driven shaft in one direction only.
Structural accommodation by twinning of copper during severe plastic deformation
Authors: Rogachev S , Zemlyakova N 
Published: January 2020

Abstract
The influence of severe plastic deformation on structure and physical and mechanical properties of pure copper was investigated. The copper was in its initial state after 2, 4, and 8 passes of equal channel angular pressing (ECAP). We used electron microscopy, X-ray analysis and electrical conductivity technique. The transformation of macrocrystalline structure under ECAP is a result of deformation twinning under the action of partial dislocations. It was found that the refinement of the initial deformation macro-twin of 200 μm to a deformation micro-twin of 240 nm occurs during ECAP without the development of dynamic recrystallization process and is accompanied by an increase in microhardness.
Methodology for designing optimal internal grinding cycles resistant to varying processing conditions
Authors: Akintseva A V , Prokhorov A V , Omelchenko S V 
Published: January 2020

Abstract
In this article the design methodology of optimal control cycles of radial and axial feeds by the example of internal grinding operations is considered. The methodology is based on the functional interrelation between main technological parameters of machining (cutting modes, cutting zone geometry, physical mechanical properties of machining material, wheel blunting and its characteristic) and cutting forces, processes occurring in the machining zone. Dynamic programming method was used as mathematical optimization method. Principal time (task of operating speed) was used as objective function. For stability augmentation of product-quality index the test of objective function limitations was made for two groups of machining conditions (favorable and unfavorable).
Generalized cutting force model for grinding
Authors: Yudin Sergey , Smolyanoy Kirill , Pereverzev Pavel 
Published: January 2020

Abstract
In CNC grinding operations different surfaces are processed with various types of grinding. Model of cutting force is necessarily used in cutting modes calculating. However, it's impossible to use partial empirical dependences of cutting force for automating of cutting modes calculation because they do not cover all normative space of grinding conditions and are not intended for use in the calculation of automatic CNC grinding cycles. Therefore analytical wide-range models of cutting forces for different types of grinding are needed, but these models should be designed on the basis of common idea of kinematics and physics of metal removal processes. The article proposes the method of obtaining cutting force models for different grinding types, obtained from a generalized analytical wide-range cutting force model, as particular cases for a given grinding type. Generalized model of cutting force is obtained on the basis of fundamental regularities of mechanics of metal' plastic deformation by wheel grains in a cutting zone, kinematic of cutting process by abrasive grains under conditions of temperature and speed parameters during grinding, functionally related with cutting modes, geometrical parameters of a contact zone between a wheel and a workpiece, structural behaviors of processed material, wheel grains blunting.
Damper for mobile installation of oil sludge pyrolysis
Authors: Mazidullin D N , Zubairov S G , Bairamgulov A S 
Published: January 2020

Abstract
The article discusses the main types of dampers used in modern industry, their advantages and disadvantages. The reasons for their inefficient work on the mobile installation of pyrolysis of oil sludge. A new design of the collet elastomer type damper is proposed.
Eigenvibrations of an elastic bar with mechanical resonator
Authors: Samsonov A A , Korosteleva D M , Solov’ev S I 
Published: January 2020

Abstract
The differential eigenvalue problem governing eigenvibrations of an elastic bar with fixed first end and mechanical resonator attached to second end is investigated. This problem has an increasing sequence of positive simple eigenvalues with limit point at infinity. To the sequence of eigenvalues, there corresponds a complete orthonormal system of eigenfunctions. We introduce limit differential eigenvalue problems and derive the convergence of the eigenvalues and eigenfunctions of the initial problem to the corresponding eigenvalues and eigenfunctions of the limit problems as a resonator parameter tending to infinity. The original differential eigenvalue problem is approximated by the finite difference method on a uniform mesh. Error estimates for approximate eigenvalues and eigenfunctions are established. Theoretical results are illustrated by numerical experiments for model problems. Investigations of this paper can be generalized for the cases of more complicated and important problems on eigenvibrations of beams, plates and shells with attached resonators.
Analysis of the reliability and efficiency of the technical system with preemptive recovery of a component
Authors: Obzherin Yuriy E , Boyko Elena G , Fedorenko Sergey N 
Published: January 2020

Abstract
One of the methods to improve the reliability and efficiency of technical systems is preemptive recovery, which allows to reduce the effects of system failures. The article discusses the semi-Markov model for monitoring latent failures of a technical system, taking into account preemptive recovery for the remaining time until the next latent failure. The characteristics of the reliability and efficiency of the system are found. The results can be used to assess the effectiveness of the use of preemptive recovery.
Kinematic analysis of the deflecting mechanism for pulsed filler wire in MIG/MAG welding
Authors: Bulychev V V , Golubina S A 
Published: January 2020

Abstract
The article deals with the features of the functioning and design of combined mechanisms of the deflecting type for pulsed feeding of filler wire in MIG/MAG processes. The formulas allowing to determine the kinematic parameters of the filler wire supply depending on the geometric parameters of the designed mechanism are obtained.
Increase of durability of an amphibious vehicle water jet propulsion drive
Authors: Nenashev Pavel , Abdulov Sergey , Taratorkin Alexander 
Published: January 2020

Abstract
The analysis results of dynamic loading of the amphibious vehicle’ water jet drive are presented, the hypothesis about the durability limitation of the drive due to the onset of resonance forced and parametric oscillations is advanced. Solutions of that problem are justified.
The study of the complex thread knurling process
Authors: Antsupov A V , Fedulov A A , Yurchenko S V 
Published: January 2020

Abstract
The study carried out to research a manufacturing process of long products for mining industry by a method of cold knurling, in particular, on a stud of a self-drilling bolt used for strengthening of mountain rocks. The solution of the task was obtained by mathematical simulation of the knurling process in the FE software package that allows establishing stress-strain state parameters necessary to analyze forming and loading of the process. According to the R&D carried out on a basis of the two-rolled screw thread rolling machine was developed a technological process for which the knurling rollers were design and created. The manufactured pilot batch of items that’s meeting the requirements for such type of anchors speaks of capability to maintain low-series production of self-drilling fasteners based on the complex profile cold knurling method of a long billet.
Analytical evaluation of materials wear resistance and tribotechnical coupling resource
Authors: Antsupov Alexander V , Antsupov Alexey V , Slobodianskii M G 
Published: January 2020

Abstract
When predicting the durability of various friction units at the design stage of the machine, an experimental-analytical standard of wear resistance is used. Its definition requires long-term and expensive experimental studies of samples or full-scale analogs. In order to reduce these costs, in this work, the fundamental theoretical dependences are derived for evaluating the wear resistance and the life of tribocoupling operating in stationary conditions of friction and fatigue wear. The basis for building the desired dependencies is a thermodynamic analysis of the steady-state process of friction, as a dual, molecular-mechanical process. The verification of the obtained theoretical dependences was carried out by comparing the calculated and experimental values of the wear resistance of samples abraded by the FCM-1 friction commercial machine according to the standard “steel roller - cast iron pad” under various conditions of friction interaction. The obtained results showed a fairly high adequacy of analytical dependencies. The proposed equations can be used to calculate the expected life of various tribocoupling at the design development stage of machines or their reconstruction.
Residual welding stresses evaluation in the typical platform element of amphibious all-terrain vehicle by ultrasonic method
Authors: Kurashkin K V , Mishakin V V , Gonchar A V 
Published: January 2020

Abstract
As part of solutions development for the technical diagnosis of the amphibious all-terrain vehicle platform, evaluation of residual stresses in a typical welded joint of the frame was carried out by the acoustic birefringence technique. The significant residual stresses were observed after welding, the largest in the heat affected zone. The intricate distribution of the residual stresses due to the complex boundary conditions was obtained. The state of the material was estimated using the hypothesis of maximum shear stress. The difference of the principal stresses was compared with the yield stress.
Adjusting of polar crane running gear at the corporate customer site
Authors: Pimshin Y I , Demidenko A S , Pimshin I Y 
Published: January 2020

Abstract
The article discusses the issues of adjustment of polar cranes at the customer site. It shows that the defining characteristics when adjusting the movement of the crane around the circumference are the geometric parameters of the running gear. It is noted that the repair-fit geometry of the bridge and the running gear of the crane corresponds to its non-stressed state. The non-stressed state of the crane characterizes the condition under which the deformations in its structural elements are absent or minimal. This crane position is achieved by installing it on the track in the middle between the two limiting states that are predetermined. It is emphasized that defects are eliminated exclusively in the running gear of the crane in the process of adjustment. Errors made in the process of manufacturing and installation are compensated during the crane adjustment. It is noted it refers to all errors made in the manufacture of structural elements as well as those made directly during their installation, and non-standard gaps in the moving parts of the crane determining their backlash.
Dynamic analysis of elementary differential gear with rigid links
Authors: Slobodyanik T M , Balakhnina E E 
Published: January 2020

Abstract
At present the machine dynamics investigations are conducted in the next directions: dynamic processes research in special machines; research of the machines which links are solids; research of mechanisms representing a combinations of a solids and elastic systems. In this paper the elementary differential gear with rigid links dynamics is investigated. A number of dynamic problems can be solved accurately enough without taking into account the loaded element elasticity. Research of dynamic processes of one degree of freedom mechanisms are quite fully published in scientific literature, which cannot be said about mechanisms that have two degrees of freedom. In this paper are compiled and solved the movement equations for differential mechanism with two degrees of freedom. Mechanism has two degrees of mobility, therefore, the position of all its links is determined by two generalized coordinates. The mechanism movement is described by two Lagrange equations of II kind. Rotation angles of the drive and driven shafts are taken as generalized coordinates. System of differential equations of the second order relativ generalized coordinates is compiled. All coefficients of this system can be calculated in advance. Joint solution of equations of the system makes it possible to determine the angular accelerations of the two main links. Equations for determining angular velocities and angular accelerations of drive and driven shafts are recieved.