bluuebunny/crossref_metadata_2025_split huggingface dataset:
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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.
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

Abstract
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.
Blagonravov Continuously Variable Transmission: computational model of load distribution over elements of control system
Authors: Soldatkin V A , Yurkevich A V , Tereshin A V 
Published: December 2020

Abstract
The paper presents a kinematic scheme of a differential planetary control gear designed to change the vibration amplitude of the intermediate links of the Blagonravov mechanical continuously variable transmission on the move and under load. A computational model of load distribution over the elements of the planetary gear is developed. The influence of the internal gear ratio and vibration amplitude on the load distribution is estimated. The established dependencies are recommended to be applied when choosing the drive motor power of the transmission control system.
Damage assessment of materials at low temperatures using the parameter of the fractal dimension of the microstructure
Authors: Kabaldin Y G , Khlybov A A , Anosov M S , Shatagin D A 
Published: December 2020

Abstract
The article is devoted to the study of the evolution of the microstructure of steel 12Kh18N10T in the zone of intense deformation during fatigue loading. An algorithm for quantitative analysis of the microstructure of a material based on an indicator of fractal dimension is described. The studies have led to the conclusion that the fractal dimension of the microstructure of the material can serve as an indicator of its damage in a wide temperature range, and used as a quantitative criterion for the prefracture of the material, both during laboratory tests and during operation.
Involute Teeth with Variable Base Diameter
Authors: Seregin A , Kravtsov A 
Published: December 2020

Abstract
The article presents the results of theoretical and experimental research. The reserve of increasing the durability of gears of machines and mechanisms and reducing the costs of their maintenance and repair is shown to reduce wear of the surfaces of the teeth. The dependences for the calculation and construction of the profile of the teeth of the wheels, providing a decrease in the coefficient of relative slip. Using formulas in polar coordinates for the angle of deployment of the tooth profile involute, a new shape of the lateral profile of the gear teeth is obtained.
Hydraulic shock suppression mechanism of the hydraulic drive
Authors: Fomenko N A , Burlachenko O V , Lyashenko A A 
Published: December 2020

Abstract
Researches show that hydraulic shock provokes premature destruction of hydraulic drive high-pressure hoses and unauthorized emission of working fluid into the atmosphere, resulting in environmental pollution. There are ways to protect the machines hydraulic transmission based on the principle of automatic disconnection from the working fluid supply at the hoses damage. However, well known protecting methods do not solve the mentioned problem completely as the hydrodynamic alternating loads caused by hydraulic impact at operation activating when the closing device of the hydraulic drive protecting system do not only destroy the hoses, but also lead to oscillatory process of the locking device shutter, decrease in speed of locking device operation, increase in closing time of the damaged hydraulic line and consequentially increase in a working liquid losses at a high pressure hoses destruction. To eliminate the above-mentioned deficiencies, theoretical and experimental research of the devices parametric characteristics was carried out and a new technical solution was developed which provides increase of closing device functional use while the cotemporaneous design simplifying.
Stress waves in a cylindrical body interacting with external medium
Authors: Sultanov K S , Khusanov B E , Rikhsieva B B 
Published: December 2020

Abstract
The unsteady-state axisymmetric problem of longitudinal interaction of a cylindrical body with external elastic medium is considered in the paper. The condition of Coulomb friction is accepted at the contact boundary. The solution is implemented by the finite difference method. The results are shown in graphs and analyzed. The changes in stress, velocity, and displacement of particles at some points of a cylindrical body and external medium are presented. An increase in longitudinal stresses and particle velocities in the cylinder was determined when compared to a given load due to the outflow of strain energy from the external medium. The mechanism of strain energy redistribution and friction forces formation is shown, the changes in the direction of contact forces action are revealed. A significant violation of the uniform deformability of the medium, and possible maximum value that occurs in a cylindrical body, is determined. The established dependences of tangential stresses on relative displacements qualitatively coincide with experimental data obtained during the interaction of fragments of underground pipelines with soil.
To the question of the distribution of the workload between the teeth of chain gear sprockets
Authors: Nekrasov Ya A , Sobolev A N , Arbuzov M O , Rivkin A V 
Published: December 2020

AbstractApproaches and methods for solving the problem of the distribution of the workload between the teeth of chain gear sprockets are considered. A review of research on this topic is given. In accordance with the premise that the elastic deformations of chain links and sprocket teeth have a decisive influence on the distribution of workload between teeth, an automated calculation technique is proposed. According to the results of the calculation, the number of simultaneously transmitting the main share of the working load of the teeth of the sprockets is limited and ranges from one to three.
Research of sparing technologies of tunneling
Authors: Pishchukhin A M , Akhmedyanova G F 
Published: December 2020

Abstract
In the work, various tunneling technologies were considered. Separately analyzed force factors and torque. The axial and radial forces acting on the breed arising in the presence of a conical part of the tool are estimated. Three ways to balance the torque are considered. A moments alignment device is described for a method by dividing a penetration zone into annular and circular parts. As a criterion for the choice of technology, it is proposed to use the indicator of the stress-strain state that occurs at the time of penetration, calculated in accordance with the theory of the highest tangential stresses. The study of four different tunneling technologies by the selected criterion showed that they can be ranked by the created stress-strain state. At the same time, the generated stresses are affected not only by the driving conditions in the form of axial force and torque, but also by the presence and size of the conical part of the tool, as well as torque equalization devices. The smallest stresses in the rock are created with direct selection technology, since there is no torque, and due to local selection with a small tool, the axial pressure decreases. In second place in preference is the technology with equalization of moments, however, it is based on a rather complex technical device. The largest load on the breed is provided by the shield technology of sinking due to the simultaneous presence of both axial force and torque.
Assessment of the influence of contact surface roughness on thermal conductivity
Authors: Ezhov A D , Bykov L V , Golikov N S 
Published: December 2020

Abstract
The presented work describes a modified technique for numerical modeling the characteristics of contact pairs in technical systems, based on the use of microgeometry parameters of contacting surfaces. The microgeometry parameters of the contacting surfaces are determined according to the measurements of their roughness profile. The described technique allows one to reduce significantly the sample size of the values of local extrema of microprotrusions and microdepressions that have a real impact on the value of contact thermal resistance. The described technique can significantly reduce time and hardware costs and simplify the calculation procedure itself. In addition, the proposed methodology by introducing a specified sampling interval allows you to set the required level of accuracy at the initial stage.
Simulation of satellite bearings loading in planetary cycloid gear
Authors: Tchufistov E A , Tchufistov O E 
Published: December 2020

Abstract
The loading of satellite bearings of planetary cycloid gearbox is a very important characteristic that can determine its operability. The article presents an analysis of changes in the main parameters of gear loading. Initially, the loading analysis of satellite bearings for the starting position was performed, taking into account the manufacturing tolerances. After that, the change in loading during the satellite rotation was considered. The gear was considered with stationary input shaft and rotating pinwheel and satellite. To establish relationships between parameters in the gear, mathematical models of the satellite’s force interaction with the pin-rollers and pins of the output shaft were used. The computer experiment used the MathCad package. The results of the analysis showed how the forces on the bearing change with increasing clearances at a constant torque on the output shaft. It was found that the gear operation is accompanied by a continuous change in the forces acting on the bearing.
Study of a throttle work-fluid flow regulations characteristics of the electro hydraulic actuator under aerodynamic load
Authors: Lalabekov V I , Obolenskiy V Y , Obolenskiy Y G , Samsonovich S L 
Published: December 2020

Abstract
This article addresses the issue of external load influence on characteristics of electrohydraulic actuator throttle regulation. Hinge moment, constant and inertial load as well as viscous friction and working fluid compressibility were considered as an external load. In research of «ultimate» dynamics actuator’s capabilities external load has the greatest impact, thus actuator’s bandwidth is reduced and phase delay is increased. The result of these influences on static and dynamic characteristics is proposed to be called «the throttle effect» in electro hydraulic actuators. Taking into account «throttle effect» of electrohydraulic actuator’s mathematical model was obtained.
Modeling of non-contact atomic force microscope with two-term excitations
Authors: Bahrami Mohammad Reza 
Published: December 2020

Abstract
The goal of this article is to study the dynamical behavior of atomic force microscope cantilever in its non-contact mode of operation. The lumped parameter model is used to construct the mathematical model of the cantilever. The tip of the cantilever is excited by two harmonic terms and is in interaction with the sample surface. The Van der Waals force, tip-sample interaction force, makes the system nonlinear. Using multiple scales method, the frequency response equation is found. The effects on the amplitude of excitations, the damping coefficient, and initial sample – tip distance is studied and presented as the results.
Improving the mechanical and operational characteristics of aluminum alloys by multi-contact deformation treatment
Authors: Kirichek A V , Barinov S V , Yashin A V 
Published: December 2020

Abstract
Experimental studies of the possibility of improving the mechanical and operational characteristics of aluminium alloys by surface plastic deformation (SPD) have been carried out. As a processing method, wave strain hardening (WSH) was chosen. The adaptation of the existing equipment for hardening aluminium alloys was carried out and the limiting technological modes of processing were established. As a result of experimental studies of hardened samples, it was found possible to provide a hardened layer depth of 10 mm with a maximum degree of hardening 2.12 times higher than the original, as well as the possibility of increasing the operational characteristic - resistance fatigue - up to 3 times is established.
Synthesis of the Reflective Surface on an Elastic Shell
Authors: Nemenko Alexandra V , Nikitin Michael M 
Published: December 2020

Abstract
We consider the method for obtaining a surface that asymptotically approaches the necessary for converging convergent beams into parallel ones by directed action on the elastic shell, in particular, on a flat flexible disk. A condition is formulated for the coefficients of the power series expansion of the solution of the differential equation of bending, under which the resulting surface will (from the center to the edges) asymptotically approach the surface of a paraboloid of revolution, which gives an exact solution. We formulate this condition by the theorem about the limit of a complex-valued function given by the vector of coefficients of its analytic element. The physical basis of the method is the effect of pulling or pushing elements, the selection of which ensures the necessary transformation of the existing shell.
Effectiveness of introducing innovative solutions in machine-building as a factor of competitive immunity of the enterprise
Authors: Blinkov Igor , Blinkov Oleg 
Published: December 2020

Abstract
The implementation of an innovation process at a machine-building enterprise provides a systematic approach to the formation of competitive immunity. The article deals with an assessment methodology which enables the necessary control over the innovation process implementation, minimizes costs for innovative activity, and helps to adjust the innovation process direction in the optimal way. The significance and attractiveness of this methodology is due to the fact that it can be applied for industrial enterprises of any economic branches regardless of the lifecycle phase of a product, enterprise and/or innovation process under study, because the list and number of specific indicators can be adjusted by the working group both before conducting the study and during the process of implementing the enterprise’s innovative activity (at any stage of its implementation). The application of the competitive immunity formation strategy during the innovation processes implementation will help to create a model of industrial partnership development, which will ensure the competitive coexistence of machine-building enterprises.