bluuebunny/crossref_metadata_2025_split huggingface dataset:
Application of the geometrical models, graphs and elements of robots kinematics as the basic elements of the unified methodology for assurance of accuracy calculating stage in precision axisymmetric products assembling
Authors: Masyagin V B , Primak D D , Volkov I A , Artykh R L , Bazhenov R I 
Published: February 2021

Abstract
The accuracy standards of engineering products, namely geometric parameters, such as tolerances, geometry deviations and surfaces form deviations, are indicative of parts and assembly units quality. The article discusses the integrated approach to the study of accuracy parameters using geometrical models, graphs and elements of robots kinematics as the basic elements of the unified methodology for assurance of accuracy calculating stage in precision axisymmetric products assembling. The integrated approach is to combine the developed techniques into a unified methodology for assurance of accuracy calculating stage in precision axisymmetric products assembling. The implementation of this approach is carried out by a phased study of the construction for all accuracy parameters in in a common reporting format based on key provisions Obtained results suggest quickly make changes to the studied design based on the phased analysis according with the developed integrated approach.
Comparative analysis of aerodynamic characteristics of catalysts for steam reforming methane
Authors: Mrakin A N , Afanaseva O V , Vdovenko I A , Ageev M A , Selivanov A A , Batrakov P A 
Published: February 2021

Abstract
The main results of the aerodynamic resistance estimation of the catalyzing backfill of processes hydrocarbons steam reforming, and also units which implementing the process of thermochemical regeneration of the exhaust gases are considered. Empirical dependences of various authors are presented for determining the resistance coefficient. Expressions which is the most adequately describe the hydrodynamic picture of the ongoing process are determined. The calculated specific resistance is in the range of 25-26 kPa/m, and correlates with indicators of industrial units operated in similar hydrodynamic modes (resistance is 18-31 kPa/m).
Effects of tooling unbalance on surface roughness in end milling
Authors: Nikolaev A , Savilov A 
Published: February 2021

Abstract
The article discusses the issues of surface roughness when milling aluminum alloys. Effects of tooling unbalance are analyzed. The mathematical modeling method was used to calculate residual tooling equipment unbalance values. To assess model adequacy, experiments were conducted according to the fractional three-level four-factor plan. The unbalance effect was determined by regression analysis of the experimental data. Response surfaces were constructed. The experiments were conducted on a modern milling center. The results confirm that the mathematical model is adequate and the degree of surface roughness depends on residual tooling unbalance values.
Modeling of Bending and Radial Hydroelastic Oscillations for a Sandwich Circular Plate Resting on an Inertial Elastic Foundation
Authors: Popov V S , Chernenko A V 
Published: February 2021

Abstract
The paper deals with the development and analysis of a mathematical model for a circular sandwich plate resting an inertial elastic foundation and interacting with pulsating viscous liquid layer. The sandwich plate is the bottom wall of a channel containing a thin layer of viscous liquid. The pressure in the viscous liquid layer changes due to a predetermined pressure pulsation law at the channel contour and its squeeze between the upper channel wall and the vibrating circular sandwich plate. The coupled hydroelasticity problem consisting of the Navier-Stokes equations, the continuity equation, and the dynamics equations for the circular sandwich plate with corresponding boundary conditions was formulated and solved. We studied the viscous fluid motion inside the channel as a creeping one. The elastic foundation was considered in the framework of inertial Winkler foundation model. To write the sandwich plate dynamics equations, we used the kinematic hypothesis of the broken normal. The hydrodynamic parameters of the liquid layer, including its stresses acting on the sandwich plate, were found. The final mathematical model is the system of partial differential equations for studying bending and radial hydroelastic oscillations of the sandwich plate. Its investigation was carried out by the Fourier method. We studied plate dynamic behaviour in the main vibration mode. In particular, the frequency response of the circular sandwich plate were constructed and studied.
The punching mechanism of holes in plates made of fragile material
Authors: Proskuriakov N E , Lopa I V 
Published: February 2021

Abstract
The shock loading of a plate made of fragile material is considered. The hypothesis is accepted that destruction of a plate can happen at the expense of a multiple splitting off of its back part because of action of the reflected pulling stresses and a simultaneous cut of a front part in the form of a stopper because of the action of tangential stresses generated by a wave of compression. It is shown that the destruction of a ceramic plate can happen at the expense of a multiple splitting off of its back part because of action of the reflected pulling stresses and a simultaneous cut of a front part in the form of a stopper because of the action of tangential stresses generated by a wave of compression. Necessary and sufficient conditions a punching of a plate are formulated and probable coordinates of its sections in which there are destructions of the type of a splitting off are determined. The results of numerical calculations are presented. The received formulas can help to pick up the characteristics of the striker providing punching of holes of the necessary diameter in plates made of friable material with beforehand given properties.
Analytical description of the interaction process of a rigid vibratory drum with a compacted surface using the general dynamics equation
Authors: Tarasov V N , Boyarkina I V , Boyarkin G N 
Published: February 2021

Abstract
This study has solved the task of creating the theory of the soil compaction by a rigid vibratory drum on the basis of the usage of the general dynamics equation. When rolling over the deformable soil the vibratory drum performs a compaction operation and represents a mechanical system that is influenced by stationary dynamic forces. A design diagram has been created for the consideration of dynamic interaction processes of the vibratory drum with the compacted soil, where the main parameters are represented by the angle α of the vibratory drum interaction with the soil, angle β of the inclined plane, which simulates the vibratory drum resistance rolling during the soil compaction and vibratory drum geometric parameters. The general dynamics equation allows to obtain an analytical solution of the problem of the vibratory drum interaction with the soil in the form of the sum of elementary works of the tractive force T, load Q on the wheel axles, soil reaction forces on the vibratory drum, and rolling resistance forces. The solution is presented in the equation form of the sum of the elementary works of all the indicated forces, which is equal to zero. Analytical dependences of the vibratory drum rolling moment, rolling resistance force and vibratory drum rolling resistance coefficient over the deformable soil in relation to construction soils of the 1st – 4th strength categories have been obtained. The obtained results can be used when designing vibration rollers for the compaction of deformable media.
Formation of requirements to the laboratory experimental unit under condition of continuation of researches of processes of heat and mass transfer on a model experimental unit
Authors: Trushlyakov V I , Lesnyak I Yu , Urbansky V A 
Published: February 2021

Abstract
Theoretical results of modeling of vacuum process of evaporation of model liquid in closed volume, carried out for experimental laboratory unit (ELU) and experimental model unit (EMU), differing in size, boundary and initial conditions are considered. The parameters of EMU are determined on the basis of the theory of similarity to the processes taking place in the tank of the launch vehicle stage in the field of small overloads, and the parameters of the ELU selected from the conditions of the existing laboratory equipment. The correlation functions of the process parameters (mass and temperature), showing the degree of proximity of the processes, have been calculated on the example of the process of liquid evaporation under vacuum effects for ELU and EMU, obtained by using the ANSYS Fluent software package. In the course of numerical experiments the vacuum pump capacity was varied to ensure equality of Nusselt criterion for ELU and EMU.
Justification of chosen values of the weight coefficients of the compaction value for continuous compaction control systems for vibration rollers
Authors: Tyuremnov I S , Morev A S , Krayushkin A S 
Published: February 2021

Abstract
The problem of monitoring the compaction of road construction materials in structural construction is currently relevant. The methods of quality control of compaction of road construction materials currently used in Russia during quality inspection do not provide a way to estimate more than 0.1% of the total compaction area. Today there is a wide variety of continuous compaction monitoring systems for vibratory rollers. Such systems allow operators of vibratory rollers to monitor the condition of compacted material in real time, which significantly improves the quality of road construction. The operation of most monitoring systems is based on the compaction index obtained from the analysis of the acceleration spectrum of the vibratory drum. When a new soil compaction monitoring system is only starting to be developed, it is necessary to develop and test in the field a new, more perfect compaction indicator, and to compare it with the existing compaction values. A field research has provided us with signals from vibration acceleration sensors placed on the frame of a vibratory drum and acceleration spectra of the vibratory drum using ZETLAB software made by ETMS. To calculate the proposed indicator, the received data was processed in STATISTICA v.10. The final correlation analysis was performed using the CORREL function found in MS Excel 365 and its financial and scientific data analysis tool. As a result of this correlation analysis, it was found that the proposed Compaction Value has the highest coefficient of linear correlation with the value of the dynamic deformation module Evd in all areas of the field research. In this regard, it can be concluded that using the proposed Compaction Value is reasonable in the development of a new continuous monitoring system for compaction of road-building materials with vibratory rollers.
Investigation of plasma parameters of a single-gas ion engine using a single langmuir probe
Authors: Vavilov I S , Fedyanin V V , Yachmenev P S , Stepen’ P V , Lukyanchik A I , Zharikov K I 
Published: February 2021

Abstract
This paper presents the results of an experimental study of the parameters of nitrogen, argon and helium plasma obtained in high-frequency capacitive ring discharge at a pressure of 35 Pa. The parameters were determined by a single Langmuir probe. Work is being carried out as part of a project to develop a backlash ion microwave plasma generator. The object of study is ionized gas formed in the ring capacitance gap of a microwave solid-state generator emitter on the MOSFET transistor MRF284. The power consumed by the microwave generator in the study is no more than 5 W. The work resulted in getting the volt-ampere characteristics of a high-frequency discharge in low-pressure gas and determining the main plasma parameters.
Investigation of the effect of a dent on the stress state of the wheel in the “wheel-rail” contact
Authors: Vorobiev A A , Krutko A A , Sedykh D A 
Published: February 2021

Abstract
The Purpose of this work is to determine the effect of a dent on the stress state of the wheel at different rim thicknesses. The article uses methods of numerical solution of partial differential equations (finite element method) to determine the stress state in the contact “wheel-rail” at different thickness of the rim with a chink and without a chink. Based on the research, proposals have been developed to change the norms of rejection of wheels with a thin rim in the presence of a dent on the surface of the ride. Changing the norms of rejection of wheels with a thin rim in the presence of a dent on the surface of the ride will increase the resource of the wheels and thereby reduce the need for new wheels.
Mass-centering characteristics of solids within quasi-rotation surfaces
Authors: Beglov I A 
Published: February 2021

Abstract
The methods for generation of digital 3D-models of solids within one sheet of a quadrilateral surface of quasi-rotation are described. The resulting models are used to create solids by means of 3D-printing. When analysing the physical properties of solids, an assumption is made about the specificity of the location of their centres of mass. To verify this assumption, the capabilities of the automatic projection are applied. Based on the results obtained, it is found that there is a certain solid - an individual case of the studied solids, the centre of mass of which is located in the geometric centre of its outline, which is a circle. The error curve method is applied to determine the initial parameters of modeling the desired object. As a result of the search, a digital and solid-state model of a solid within a single sheet of the quasi-rotation surface, whose center of mass coincides with the geometric center of its outline, are obtained. The produced solid has properties that partially coincide with the properties of rotation solids. Such a coincidence is not obvious. In general, the center of mass of the studied solids is not located at the indicated point.
ABAC Implementation Based on Key Pre-Distribution Scheme
Authors: Belim S V , Belim S Yu 
Published: February 2021

Abstract
In the article, the KDP key pre-distribution scheme is modified for attribute access control. A scheme for implementing attribute-based access control on symmetric encryption is proposed. There are three participants in the scheme: a key distribution server, a subject, and a storage server. The key distribution server sends key content over secure channels when the system is initialized. The key materials content is determined by the attributes of the object and the subject. The storage server calculates the object ′s encryption key based on the object ′s key materials and attributes. The object is stored encrypted. If the subject has the necessary attributes, it can calculate the encryption key and access to object. If the subject does not have a sufficient set of attributes, the key cannot be computed and access is denied.
Improvement of devices for early diagnostics of the optical fibers state of telecommunications systems
Authors: Bogachkov I V , Gorlov N I 
Published: February 2021

Abstract
A construction of the Brillouin reflectometers schemes is discusses in this work. The algorithms for processing measurement results are consider.
The results presented in the researches allow us to improve the algorithms for processing Brillouin reflectograms by introducing reference channels and a reference database.
The presented schemes of Brillouin reflectometers are of interest for improving optical fiber monitoring systems.
Method of High-Noise-Resistant Qudrature-Pulse Phase Modulation
Authors: Khazan V L 
Published: February 2021

Abstract
The paper refers to the method of quadrature intra-pulse phase modulation (QIPPM). This method focuses on solving the relevant problem of improving the noise resistance of message transmission over communication channels with variable parameters. The problem is resolved by intra-pulse phase manipulation of signal quadratures by mutually orthogonal binary sequences of the Walsh function type. The advantage of the QIPPM modem over other modems is shown, and recommendations for its practical use in communication channels with pseudo-random tuning of operating frequency are given.
Research on improving the performance of telecommunication broadcasting and warning systems from the type of microprocessor platforms
Authors: Kolpakov A A , Belov A A , Kropotov Y A 
Published: February 2021

Abstract
The article discusses the use of various microprocessor platforms for the development of terminal devices of telecommunication broadcasting and warning systems. Their characteristics are investigated and the performance of the selected platforms is tested when mixing audio streams. The possibility of using parallel audio processing algorithms is also being considered.
Geometric Modeling IN THE Problems OF Lever Mechanism Kinematics Research
Authors: Lyashkov A A , Sheveleva T A 
Published: February 2021

Abstract
General information about the elements of lever mechanisms consisting of kinematic pairs is presented. The classification features of pairs are given: constraining conditions imposed by this pair, their graphic images, as well as brief descriptions of some of them. Two main problems of kinematics are highlighted. There are two main methods for solving the first problem of kinematics related to the solution of mechanism positioning questions: analytical and numerical. The second problem is an inverse one. A variety of methods for solving it is shown in the paper. The choice or development of the method is mainly determined by the complexity of the mechanism. The analysis of the documentary flow on the problem of kinematics of lever mechanisms allowed us to identify the main areas of research in this area. One of the promising areas is geometric computer modeling, which has a number of advantages in comparison with others. Its application makes it possible to study not only coordinate spaces formed by geometric elements of the lever mechanisms themselves, but also objects generated by products involved in these mechanisms functioning. The line of such research allows us to improve directly CAD systems used in modeling and obtain new results in various application areas, which is an urgent task.
Constructing paths to avoid multiple obstacles
Authors: Nefedov Y Y 
Published: February 2021

Abstract
This article deals with the issues of modeling the trajectory of an object moving on a plane. Its trajectory may intersect with obstacles (circles). The author proposes an algorithm for modifying the initial trajectory of the object taking into account the movement of obstacles. At the beginning, we describe how to divide the initial trajectory into sections. Then we describe how to modify the line on each segment in two cases, depending on the angle between the projection direction and the direction of movement of the obstacle center.
On smoothness of connection of spatial curve cyclographic projection segments
Authors: Panchuk K L , Lyubchinov E V 
Published: February 2021

Abstract
The correlation between smoothness of connection of segments of a spatial curve and the respective cyclographic projection is considered. The sufficient condition for smoothness

C
α

k
−
1

at the point of connection of segments of cyclographic projection of a spatial curve described by a polynomial spline of order k +1 is formulated and verified. It has been demonstrated that despite the derivative of order k +1 of the spline function describing the spatial composite curve along with all the higher-order derivatives not being continuous, it is possible to connect segments of the cyclographic projection with smoothness

C
α
r

, where r = k + i, i = 0,1,2,…. Achieving smoothness

C
α

k
−
1

,

C
α
r

through the formulated condition of sufficiency is demonstrated on numeric examples. The obtained results of the study can serve as the basis of development of effective algorithms of cyclographic formation of geometric objects applied in geometric optics, road surface form design, and optimal cutting tool trajectory design in pocket machining.
Using weight values of generalized velocities to handle deadlocks in the synthesis of anthropomorphic robot arm movement
Authors: Pritykin F N , Nebritov V I 
Published: February 2021

Abstract
When controlling the movement of an anthropomorphic robot arm mechanism in an organized space with forbidden regions, there is a possibility of deadlocks. The paper studies the motion synthesis using weight coefficients of generalized velocities in order to prevent deadlocks. As a result an algorithm for the motion synthesis using weight coefficients in the virtual simulation of the anthropomorphic robot arm movements is developed.
Research of heat mode of linear permanent magnetmotor for Long –Way one stage piston compressor
Authors: Tatevosyan A A 
Published: February 2021

Abstract
The paper discusses one of the design stages of an electrical complex of a linear motor of a low-speed long-stroke piston compressor based on a permanent magnet synchronous motor (SMPM). The article concernswith studying the thermal regime of the magnetic system. The temperature regime up to 800 Cis the limitation for the use of permanent magnets of the N40 series based on the NdFeB alloy, consequently the problem of determining the amount of heat released by the winding is urgent. To study the thermal regime, a prototype of a linear permanent magnet motor was developed and tested with a long-term current flow of 5 A. The efficiency of using a sectioned winding divided into eight coils especially whenthe coils switchedin two pairs is shown.
Study of the impact of speech-like interference on the psychological and emotional state of a human
Authors: Trushin V A , Zavodovskaya A I , Oveshnikov I A , Toporishchev E V 
Published: February 2021

Abstract
The protection of speech information should not only be as effective as possible, but also convenient for people who are in the protected room. Currently, the active protection devices, which are noise generators, are more often used for this purpose. The most effective is speech-like interference. But at the same time, it is noted that this type of interference creates more discomfort compared to others. This study is aimed at identifying the noise annoyance of speech-like interference, created on the basis of syllabic and word articulation tables, as well as reverberation speech-like interference. The experiments have shown that the most annoying is speech-like interference based on syllabic articulate on tables. The main negative consequences were headache, annoyance, and fatigue. Modification of the speech-like interference in the form of peak trimming improved the auditory perception of the interference by people, while the efficiency did not decrease.
The indicator R′ of the statistical significance for subgraph for motif discovery task
Authors: Yudina M N , Gam A V 
Published: February 2021

Abstract
The analysis of the statistical significance of subgraphs is carried out in dealing with solving the problem of detecting network motif in graphs of large networks. A new generalizing indicator of the significance of subgraphs is proposed. The indicator is intended to detect network motif when statistical methods are used to calculate the frequencies of occurrence of subgraphs. In fact that the subgraph in the studied network graph occurs more often than in the randomized versions of this graph (a sign of a network motif) is established statistically reliably.