bluuebunny/crossref_metadata_2025_split huggingface dataset:
Geometric modeling of multifactor processes and phenomena by the multidimensional parabolic interpolation method
Authors: Konopatskiy E V , Bezditnyi A A 
Published: January 2020

Abstract
The paper presents the results of multidimensional parabolic interpolation studies, (one of the special cases of the multidimensional interpolation method), applied to solve problems of modelling multifactor processes and phenomena using geometric objects of multidimensional affine space. The authors describe the technique of geometric model tree forming of the process under study and its analytical description based on computational point algorithms with subsequent implementation on a computer. Such an approach makes it possible to effectively use multidimensional interpolation instead of multidimensional approximation (based on the least squares method) for solving problems of mathematical and computer modelling of multifactor 3-level processes and phenomena of animate and inanimate nature, technology, economy, construction, and architecture The study gives an example of multidimensional parabolic interpolation application to simulate the dependence of the fine-grained tar-polymer concrete compressive strength on 4 factors: tar viscosity, polyvinyl chloride dropout concentration in coal tar, activator concentration on the mineral powder surface and temperature, followed by optimization of the composition and operating conditions road pavement.
Applying of IIoT technologies in an automated information system for monitoring and accounting of energy resources
Authors: Lavrukhin A A , Malyutin A G , Okishev A S 
Published: January 2020

Abstract
The authors consider the actual task of increasing the scalability and ease of deployment of a distributed automated system for monitoring and metering of energy resources (ASMMER, hereinafter referred to as the System). The system intended for experimental investigation of complex transient modes of operation in high-voltage circuits of power supply systems (up to 25 kV) of the experimental Sverdlovsk Railway (Russian Railways) pilot site. This article proposes a solution using the technologies of the Industrial Internet of Things (IIoT). The protocol stack for the system, that was formed and implemented programmatically, reduces the amount of traffic in the system and supports existing and developing devices with LoRa and XNB technologies. The proposed solutions allowed the development of mobile information-measuring systems using wireless technologies (ZigBee, LoRa, XNB) and independent power sources. The proposed set of solutions allows providing a modular architecture for the rapid addition of new devices and functions through the use of IIoT technologies.
Improving the measurement of thread parameters by use of corundum elements
Authors: Leun E V 
Published: January 2020

Abstract
Considered an advanced method of the three wires to measure the average diameter dav and pitch P of the thread using three elements corundum (synthetic sapphire, sapphire, ruby): two fibers and tip with the ability to visualize and measure the size of the contact zone with the product to calculate the contact elastic deformation. It is proposed to use two fibers incoherent and one coherent interferometers to measure the position of corundum fibers and the tip. A method for calculating the diameter dav and pitch P of the thread based on the results of interferometer measurements by using the compensation of contact elastic deformations is presented.
Computer geometric modeling of solutions to the systems of quadratic equations of the same kind
Authors: Panchuk K L , Lyubchinov E V 
Published: January 2020

Abstract
In the present paper the opportunity of computer geometric modeling of solutions to systems of algebraic equations of the same kind is researched. The geometric interpretation of such systems and their solutions are known in classical geometry as the Apollonius problem. It is demonstrated that in space of dimension equal to the number of equations of the system, the latter can be given a cyclographic interpretation. This significantly simplifies solution to the initial system as well as the Apollonius problem itself. As a result, the system of equations receives an analytical, i.e. exact solution, while constructive solution of the Apollonius problem is reduced to solution of a positional task of finding common points between a straight line and a cone of revolution. Algorithms for analytical and constructive solutions can be generalized to a space of n dimensions with preserving the analyticity of solutions. Algorithms are realized by means of the tools of CAD systems and computer algebra.
Software and hardware complex for monitoring the ion beam parameters of a particle accelerator
Authors: Pavlov L A , Nikonova G V , Kabanov A A , Shchelkanov A I 
Published: January 2020

Abstract
This paper presents the development of an integrated system for monitoring the position of the ion beam in a particle accelerator. The effect of external disturbances and the imperfection of the accelerators themselves lead to the distortion of the ion beam trajectory in a cyclotron; therefore, constant monitoring and correction of the beam position is necessary. To control and correct the distortion of the ion beam trajectory in a cyclotron, an electrostatic sensor based on a pickup electrode is used as a meter. One of the features of the developed meter is that the estimation is carried out according to the second harmonic of the signal, allocated on a band-pass filter. This is due to the fact that during the accelerator work a large amount of noise is induced on pickup electrodes and the noise level at the fundamental frequency is high. The hardware and software complex converts the measured data obtained from the sensors, such as the transverse distribution of the beam energy, the beam current and the coordinates of its center of mass into an electrical signal, followed by their sampling in an analog-to-digital converter and the transmission of the measurement results through standard communication protocols and further processing in the LabView software. Using the received signals, the beam parameters such as the length of the ion bunch, the vertical beam position, and the acceleration phase are calculated for the corrector.
Development of muscular tissue electrical analog and designing the device for biopotential registration
Authors: Ryabchevsky V O , Nikonova G V , Kabanov A A 
Published: January 2020

Abstract
The development of a compatible SPICE human muscle analog and designing a device for testing the equipment and components of the electromyography signals (EMG) recording device are presented. The tools used to simulate a real EMG signal in the NI Multisim software. A muscle model has been developed, the basis of which is a linear-frequency modulating oscillator, which generates a signal with the frequency of 50–500 Hz and with the amplitude of 100 mV, which emulates the behavior of a nonsynchronous muscle signal. Muscle and nervous tissue was studied using the biopotentials oscillograms in the LabVIEW measurement systems development environment.
Algorithmic support for solution of classification problems and image recognition of the studied objects by the intelligent information and measuring system
Authors: Selivanova Z M , Kurenkov D S , Muromtsev D Yu , Pavlov V I , Shamkin V N , Trapeznikova O V 
Published: January 2020

Abstract
At the manufacturing plants producing thermal insulation materials that are used in a climate of the Arctic, non-destructive testing of thermo-physical properties to ensure the quality of the products is necessary. Therefore, the use of intelligent information and measuring system with appropriate algorithmic software to control the thermo-physical properties of the objects under study is important and relevant. The aim of research is to improve the accuracy and efficiency of determining thermo-physical properties as a result of solving the classification and image recognition problems of the studied objects in production and operation to prevent deterioration of thermal insulation properties under the effect of external influential factors. Image recognition algorithms are proposed for cases when the processed information is reliable or falls into the category of fuzzy. The algorithm of decision-making in the intelligent measuring system for the choice of the non-destructive testing method of thermo-physical properties in accordance with the class of materials under study is presented. The results of experimental studies of the intelligent information and measuring system implementing the developed algorithms for image classification and recognition of the studied objects are represented, these results confirming the increase in the accuracy of non-destructive testing in thermo-physical properties of materials.
Assurance of precision for geometric dimensions of trench during pipeline development
Authors: Agapov M E , Mikheyev V V , Saveliev S V 
Published: January 2020

Abstract
The article deals with important issue of keeping precise dimensions of pipeline trench while being developed by chain trench excavator under hard conditions of irregular soil surface. Research done in the article combined modeling of excavator overcoming soil irregularity with experimental tests of the real machine under the initial conditions of model equations. Theoretical predictions were proven by the experimental data and gave a key for the control device algorithm which is supposed to provide necessary precision of trench shape and dimensions.
Influence of the constructive parameters for long stroke piston unit on a stressed deformed cylinder state
Authors: Aistov I P , Vansovich K A 
Published: January 2020

Abstract
This article assesses the influence of the long stroke piston unit design parameters for the stress-strain state of the cylinder slow-speed stage. The stress-strain state estimation for the piston compressor cylinder slow-speed stage with a cylinder diameter equal to and more than 50 mm, show a significant increase in gaps and leaks in the cylinder-piston pair is observed, as well as an increase in equivalent stresses in the cylinder walls to the value of the yield strength of the wall cylinder material. The analysis allows for optimal engineering of the piston compressor cylinder slow-speed stage for the most promising designs.
The active system of vibration isolation with electrodynamic actuator
Authors: Burian Yu A , Sitnikov D V 
Published: January 2020

Abstract
The work is devoted to the study of the possibility of developing an active vibration isolation system in which in order to compensate for the dynamic forces on the hull arising due to the oscillations of an elastically suspended vibroactive mass, the effect of inertial forces in antiphase is used. The vibroactive force compensator is an electrodynamic actuator. It is mounted on the hull close to vibroactive mass supports and produce an inertial force by controlling oscillations of the moving mass, which compensates the force on the hull from the vibroactive mass.
Features of friction stir girth welding of small-dimension parts
Authors: Chernykh I K , Vasil’ev E V , Popov P E , Kamenov R U 
Published: January 2020

Abstract
Friction stir welding is a competitive method to other welding methods when manufacturing tanks made of aluminum alloys. Nonetheless, a lot of articles on FSW are carried out when manufacturing linear butt welds. In this article, features of manufacturing friction stir girth welds are considered. The aim of the study is to develop a list of recommendations for welding small-dimension girth joints. The experiments was carried out using pipes made of AlMg6 with 112 mm outer diameter and 6 mm wall thickness, and solid blanks with 118 mm outer diameter. The results that have been obtained allow us to conclude that the quality of the weld is stand on the contact area of the tool with the workpiece and the tool tilt angle. A scheme of welding with tool offset is proposed. Defects that are characteristic only for the small-dimension girth joints are identified. Results can be used in the process engineering of welding small-dimension tanks and pipes made of aluminum alloys.
Analysis of the natural frequencies of vibrations of the “payload – foam package” system for orbital launch
Authors: Doronin S V , Moskvichev E V 
Published: January 2020

Abstract
For launching devices and equipment (payload) into orbit they are usually placed in a foam package made of various polymeric materials. One of the functions of the foam package is to prevent low-frequency vibrations of the payload. In this connection, the problem of determining the natural frequencies of vibrations of the “payload – foam package” system is relevant. These frequencies depend on the physical-mechanical properties and the size of the foam package, the mass and size of the payload. The paper presents the results of an experimental determination of the stiffness characteristics of the foam package materials and a computational analysis of the natural frequencies of the “payload – foam package” system.
Investigation of the effect of ultrasonic impact treatment modes on adhesive properties of AISI 321 steel surface
Authors: Fedorov A A , Polonyankin D A , Linovsky A V , Bobkov N V , Blesman A I , Dubovik V I 
Published: January 2020

Abstract
This paper provides the results of UIT modes influence on adhesive properties of the surface layer of AISI 321 austenitic stainless steel. The purpose of the study was to determine the adhesion force of the samples surface processed with a varying static load of an ultrasonic instrument and its relative travel velocity to the sample. The adhesion force was experimentally detected via atomic force microscopy from the force curves of the probe retraction. In this study it has been established that ultrasonic impact treatment of AISI 321 steel does not significantly affect the adhesive component of friction force.
Methodology of experimental determination of mechanical impedance of vibration-insulating branch pipes taking into account flexibility of test facility at lengthwise vibrations
Authors: Klishin S V , Sitnikov D V , Zubarev A V , Shvarts A A 
Published: January 2020

Abstract
In the problems of vibration isolation of hydraulic system units, such as pumps, an important role is played by the problem of oscillation propagation through unsupported connections (pipelines). In order to solve this problem, in particular, rubber-cord tubes are used, which vibration-insulating properties are determined by their mechanical impedances. The aim of the work is to obtain the theoretical basis for the development of methods for the experimental determination of mechanical impedance of vibration insulating branch pipes, taking into account the flexibility of elements of the experimental facility in the case of lengthwise vibrations.
Effect of tire dynamic characteristics on vibration load at the operator’s workplace
Authors: Korchagin P A , Teterina I A , Letopolsky A B 
Published: January 2020

Abstract
The article addresses a current issue – reducing the vibration load at the operator’s workplace in the utility machine with respect to the use of chassis elements as vibroprotection element. The results of studies aimed at determining the effect of tires dynamic characteristics on the vibration load of the operator’s workplace are presented. A computational scheme designed to conduct experimental research has been shown. Correlation between tire rigidity and air pressure in the tire, as well as correlation between tire service life and tire pressure have been revealed. Results of studies aimed at determining relations between the dynamics of mean-square values of vibration acceleration of the frame, the floor and the operator’s seat, and the rigidity coefficients of utility machine tires. Conclusions have been made as to the relevance of using chassis elements as vibroprotection element at the operator’s workplace in the utility machine.
The experimental method for determining the isobaric power characteristics of pneumatic elements with rubber-cord casing
Authors: Korneyev V S , Korneyev S A , Shalay V V 
Published: January 2020

Abstract
A method for the experimental construction of isobaric static (equilibrium) power characteristics of pneumatic elements with a rubber-cord casing at a constant temperature is proposed. This method also allows you to determine isobar geometric characteristics, establishing a relationship between the height of the pneumatic element and the increment of its internal volume relative to some fixed position. The practical implementation of the method is illustrated by the example of a pneumatic element with a rubber-cord casing of the balloon type of the model N-50. The agreement of the experiment with the theoretical data calculated by the traditional method, widely used in the scientific literature, is analyzed. The obtained parameters are mandatory for the model of air spring and study the damping phenomenon. The results of the study are intended to develop vibration protection and vibration isolation systems for technical objects, the design of which includes air springs and air damping shock absorbers.
Spherical pendulum model with a moving suspension point in the problem of spatial load movement by a hoisting crane with oscillation limiting
Authors: Korytov M S , Shcherbakov V S , Titenko V V , Belyakov V E 
Published: January 2020

Abstract
The task of controlling the load spatial oscillations of a hoisting crane using a spherical pendulum model with two angular degrees of freedom is considered. In order to limit uncontrolled load oscillations, its suspension point movements are optimised. The system of differential nonlinear equations for oscillations of a spherical pendulum with suspension point acceleration along the Cartesian axes was first applied to the curvilinear load moving in the limiting oscillations. Sigmoidal dependences of two load deviation angles and rotation of the pendulum are proposed, providing for expressions of the first two derivatives of the indicated angles, as well as linear accelerations of the load suspension point along two Cartesian horizontal axes. Numerical methods are applied to obtain time dependences of the velocities and displacements of the load suspension point. The solution provides the load moving along a curvilinear trajectory at specified distances along the specified axes, subject to the maximum acceleration and crane speed limitations. Optimal time dependences of the rope deflection angles, suspension point displacements and their first two derivatives in limited oscillations are presented. The scope of the methodology is the modelling of crane working processes and the automatic movement control for the bridge and gantry cranes.
Kinetics of fatigue cracks in the rotor blades of the Mi-171 helicopter
Authors: Kurokhtin V Yu , Rogov V E 
Published: January 2020

Abstract
The rotor blades of the helicopter are operated on the principle of ensuring operability within the assigned resource, which is 2000 flight hours, after which they are subject to decommissioning. However, by the end of this period, as a rule, fatigue damage does not have time to propagate in the blade, so it can be operated on. Thus, the study of the process of nucleation and propagation of fatigue cracks in the blades will allow to determine the period during which the presence of cracks does not threaten the performance of the construction. This will make suggestions for a possible increase in the assigned resource of the blade, which, in turn, will lead to cost savings. The problem of the work is to study the propagation of fatigue cracks in the rotor blades of a helicopter to make recommendations on the possible increase in their assigned resource. Research objectives: development of methodology for full-scale testing of blades; determination of their endurance limit; development of a methodology for processing the results of full-scale tests (videos of the growth of fatigue cracks); assessment of the possibility of extending the assigned resource of the blades. Experimental methods of fracture mechanics and statistical methods for processing data obtained during experiments were used as research methods. As a result, it was found that the appearance and propagation of surface cracks in the blades with the test base of N = 1.6⋅107 cycles begin after the stresses exceed the level of 76.94 MPa. A fatigue crack in the blades propagates to failure within 150…170 hours, while the subcritical propagation of the crack lasts 130…150 hours. The period of stable slow propagation of cracks can be proposed for inclusion in the assigned resource of the blade.
Surface analysis of gear wheels produced by electrochemical treatment
Authors: Linovsky A V , Fedorov A A , Bobkov N V , Bradgauer Iu O 
Published: January 2020

Abstract
This paper provides a result of surface analysis of the gears of steel A290C1M electrochemically treated by the method of static-hydrodynamic electrolysis. Surface analysis of gear wheels was carried out via Jeol JCM–5700 scanning electron microscope. The processing parameters of electrochemical treatment, established in the present investigation, provide a good–quality of working surface of the teeth, containing defects nevertheless. It is concluded a necessity of further clarification the reasons of defects’ appearance and an expediency of methodology improvement for treatment modes selection.
Generator of periodic inertia force concentrated in one direction
Authors: Mikheyev V V 
Published: January 2020

Abstract
The paper is devoted to the problem of design for generator of periodic mechanical force based on use of inertia forces. Suggested construction transforms rotational motion of a crank of special type into swinging motion of pair of unbalanced masses. This creates inertia force of a constant sign directed along certain axes. Analytic and graphic representations for dependences of periodic force on time are presented in the article revealing the harmonic type of the force. Given construction has wide set of parameters for control and adaptation of the produced force.
Method for defining residual stresses in arched profiles
Authors: Seitov E A , Makeev S A 
Published: January 2020

Abstract
In the process of manufacturing arched steel thin-walled cold-formed profiles with trapezoidal corrugations, by rolling a flat profile into the arch through a system of rollers, in the normal section profile longitudinal technological residual normal stress are formed, unevenly distributed over the height of the section. Currently, these residual stresses are not taken into account in the design, which leads to errors in the calculations for strength and local stability of arched structures made of arched profiles. There is a number of ways for defining the residual stresses in steel structures, including arched thin-walled profiles. Still, they have a number of significant disadvantages associated with the low accuracy of the values obtained and the complexity of stress calculations. The purpose of this work is to develop a method for defining the residual longitudinally oriented normal stresses in the flanges of arched cold–formed profiles with trapezoidal corrugations, combining the simplicity of the measurement technique, calculation and high accuracy of the obtained stress values. As a result, we obtained a method of defining the residual longitudinally oriented normal stresses in cross-sections of the arched profile as in the compressed and stretched flanges for easy calculation and high enough for engineering calculations, the accuracy of measurements of parameters of the profile to calculate stresses. The proposed method can be used to define the longitudinal residual stresses in normal sections of arched profiles with subsequent consideration of these stresses in the design of structures.