bluuebunny/crossref_metadata_2025_split huggingface dataset:
Influence of an electric field on flexopolarization induced by acoustic action on a liquid crystal
Authors: Denisova O A 
Published: December 2021

Abstract
The work experimentally investigated the influence of an electric field on the direct flexoelectric effect that occurs under the influence of an acoustic field in liquid crystals. Thin layers of nematics 10-100 μm thick were studied. In this case, the liquid crystal sample was exposed to the piston method with an acoustic wave with a frequency of 1 kHz. The dependences of the first and second harmonics for different NLCs on the bias voltage value, shear amplitude, and crystal thickness were obtained. It was revealed that the flexosignal harmonics depend on the direction of the electric field; when a positive potential is applied to the movable plate, they take on smaller values than when negative. It was found that in low fields the magnitude of the flexosignal increases due to an increase in the amplitude of the director deviation, but at a critical value of the field it is suppressed, since the layer is stabilized by a constant electric field.
Electrodynamic approach for description of mass transfer phenomena
Authors: Leonov V V , Denisova O A 
Published: December 2021

Abstract
Based on the equations of macroscopic electrodynamics, the article considers the most important consequences from the point of view of practical application for condensed matter. It has been theoretically shown that a virtual molecular filter with a fairly high degree of selectivity can be used for them. The theoretical substantiation of mass transfer processes in condensed systems is presented for cases of external influence on them when solving problems of technological change of macroscopic properties of a molecular system. Monitoring problems are indicated when moving the minimum amount of substance in the case of mass transfer for processes: diffusion, adsorption, capillary filtration. The functioning of the filter is based on the theory of macroscopic electrodynamics, namely, on how the space charge density is distributed in the sample under study. The results obtained make it possible to evaluate the physicochemical changes that occur in a condensed medium under external technological influence. The presented theoretical research results can serve as the basis for improving the methods of electrometric monitoring of gaseous and liquid media of unknown qualitative and quantitative composition.
Effective dielectric permeability and electrical conductivity of polycrystalline PbTe films with disturbed stochiometry
Authors: Akhmedov T , Otazhonov S M , Khalilov M M , Yunusov N , Mamadzhanov U , Zhuraev N M 
Published: December 2021

Abstract
This paper presents the study of the effective dielectric constant and electrical conductivity of polycrystalline PbTe films with disturbed stoichiometry. It is shown that superstoichiometric additions of Te and Pb within the limits of solubility by doping with PbTe contribute to a change in a wide range of concentrations of electrically active impurities and, consequently, to an increase in the dielectric constant (ɛ), electrical conductivity (σ) and absorption coefficient (α), in addition, the excess of these components strongly affects the amount of polarization.
Kinematic model of the suspension of an electric car
Authors: Efimov A , Fedotova O , Goryunov V , Korostelkin A , Petrov R , Sharkov M , Zatylkin K 
Published: December 2021

Abstract
The purpose of the work considered in this article is to develop approaches and methods for designing an electric vehicle from the concept phase to production based on the use of digital simulation. In this study, calculations were performed using the calculation of the kinematic model of the electric car suspension and CAE. Based on the results of the calculations and their compliance with the matrix of targets and resource constraints, the geometry of the suspension parts was changed during the study. For each of the iterations of the geometry, the types and materials were selected for the subsequent production of electric car suspension parts. The application of the above-mentioned approach from the earliest stages of work allowed us not only to achieve the required criteria for the mechanical characteristics of the structure, but also to comply with the conditions for reducing the development time, the cost of production and improving its quality.
Method for assessing the thermophysical properties of the contact pair ‘tool – steel workpiece’
Authors: Chigirinskiy Yu , Tikhonova Zh , Kraynev D 
Published: December 2021

Abstract
To The analysis of methods for evaluating the properties of contact pairs “hard -alloy coated tool-steel billet” is carried out in order to use them to increase the reliability of the choice of turning modes in the generations of CNC systems equipped with technological intelligence. It is proposed to use the value of the thermo-emf of the test pass as an indirect indicator of the properties of contact pairs composed of a coated carbide tool and a processed steel billet. Models for calculating the cutting speed based on a given tool durability period of a coated carbide tool and predicting the actual cutting tool durability period for given processing conditions are proposed by introducing into their structure an additional informative value about the properties of each contact pair - the thermo-EMF of the test pass. The conducted resistance tests of various carbide plates during the processing of P-group steels showed sufficient reliability of the proposed dependences.
Automated system for design and calculation of heating devices for hot die forging
Authors: Galsanova E , Greshilov A , Kalinin Ya , Yakovlev A 
Published: December 2021

Abstract
Methods of mathematical modeling, basic technologies and methods of modeling in various design systems of the stamping process are considered. The canonical equations of temperature stresses are obtained, which make it possible to obtain a picture of the temperature distribution over the workpiece area during heating. A mathematical model has been developed for a thin metal strip during heating; thermal stresses arising in it due to uneven heating have been described. Numerical modeling has been carried out on the basisof field data, which will allow verification of the automated environment for the selection of functional and design schemes and the calculation of the parameters of heating devices in hot volumetric stamping of workpieces in terms of speed, energy efficiency, heating quality: accuracy of achieving specified temperatures and maximum heating uniformity. By areas, ease of use and readjustment, resource, reliability and maintainability. The proposed system will include the following CAD elements: databases and rules for operating with them, calculation modules, modules for selecting and matching options.
Optimum control of purpose activities in the area of quality based on a linear model of dynamics in state space
Authors: Ivakhnenko A , Anikeeva O , Erenkov O 
Published: December 2021

Abstract
The paper considers the optimization problem formulation at goal-setting in the field of quality on the basis of a dynamics verified linear model in the state space using stepwise and linear laws of enterprise activity management. The classical quadratic functional to find optimal solutions for goal-setting was used. The direct connection of these functional components with the Taguchi loss function for product quality indicators has been substantiated, and the function scope application on the managing purposeful activities process has been expanded. The optimization parameters are determined, which are the amplification factors of the control actions. These actions ensure the actual attainability of the set goals in the field of quality during the time planned period. The optimal solutions search was carried out on the example of the textile and light industry CJSC “Salyut” (St. Petersburg). The functional minimum value in case of stepwise control law is more than 14 times greater than with a linear law. This fact found under the condition of equal unit costs for quality losses and control caused by their deviations from the nominal values. The results obtained can be used for a reasonable choice of the enterprise management law in the goal-setting in the field of quality.
Strength of multilayer metal joints «shaft-sleeve-hub» of rotorcrafts obtained by plastic deformation
Authors: Lesniak S , Dudnik V , Borowy M , Lesniak O 
Published: December 2021

Abstract
Metal multilayer joints are used in the production and repair of transmission parts and control systems of rotorcrafts with intensively wearing surfaces in the form of smooth closed cylindrical and conical holes. The article describes two types of connections: rolled sleeve - hub and shaft - rolled sleeve - hub. The adhesion strength of the joints depends on the frictional forces that prevent the sleeve from displacing relative to the hub. The traction strength is determined by measuring the pressing force and the torque. It depends on the relative tension. An increase in the force of pressing the joint occurs with an increase in the relative tension of mandrel, in proportion to the hardening of the material. The smaller hub wall thickness leads to the more active effect of its springback to the foundation of contact pressure and an increasing of the traction force. Experiments have shown that the forces and moments of traction depend on the angle of the intake cone and the width of the cylindrical tape of the mandrel.
The effect of temperature on the tribological characteristics of high speed steels under conditions of friction without lubricant on the structural steel 30HGSA
Authors: Fominov E V , Shuchev C G 
Published: December 2021

Abstract
This article focuses on the study of the effect of temperature in the contact zone on the process of dissipative structures formation on the surfaces of specimens made of high speed steels (HSS) grades with different levels of thermal entropy and absolute thermo-EMF under conditions of friction without lubricant on the structural steel 30HGSA. Tribological tests were performed on the tribometer which implemented a scheme of friction “pin on disk” at constant sliding speed and normal load values. The temperature in the friction zone has changed artificially from 100 to 300°C with a special intelligent heating device. It has been established experimentally that in the process of friction of HSS specimens characterized by low values of absolute thermo-EMF the dissipative structures thickness growth rate over time at temperatures of 200-250oC decreases or remains virtually unchanged; friction coefficient decreases with the increase in temperature. For specimens made of steels with high absolute thermo-EMF the rates of dissipative structures thickness growth and their utmost thicknesses increase when the contact zone temperature increases, which is accompanied by an increase in friction coefficients.
Experimental Complex for Assessing the Effect of Wear on the Temperature and Vibration of the Tool when Turning Metals
Authors: Lapshin Viktor , Turkin Ilya , Noda Stanislav , Golodze Valera 
Published: December 2021

Abstract
The work is devoted to the development of an experimental measuring complex designed for conducting experiments to assess the mutual influence of tool wear, temperature during cutting and vibration activity of the tool when turning metals on metal-cutting machines. In this paper, it is proposed to place three vibration transducer sensors on the tool holder itself, as well as to insert an artificial thermocouple inside the cutting plate. The introduction of the thermocouple is made in such a way that temperature measurements are made close to the back surface of the tool formed during cutting. The conducted studies have shown the high efficiency of the measuring system and the possibility of its use for the identification of mathematical models of the cutting system. Research methods full-scale and numerical experiments in which the Matlab package of mathematical programs was used for data processing and analysis. Results and discussion. The results of full-scale and numerical experiments are presented, in particular, graphs of coordinate changes describing tool deformation, and data sets are obtained that reflect the dependence of the vibrational energy of tool movements on the reaction time of the thermodynamic subsystem of the cutting system.
Research Part Surface Position Influence on Metal Removal and Steady-State Roughness During Vibro-Abrasive Processing
Authors: Mordovtsev Aleksei , Butenko Viktor , Astashkin Aleksei 
Published: December 2021

Abstract
The paper is devoted to the study of part surface position and its influence on metal removal and steady-state rougness during vibro-abrasive processing. The article raises the differences between vibro-abrasive processing of external and internal part surfaces. Theoretical dependencies analysis for determination on part material removal and surface steady-state roughness is carried out. It is known that available theoretical dependencies do not take into account part surface position for material removal and the steady-state roughness calculation. Experimental researches to determine internal surface material removal with external surface isolation were carried out. The influence of part surface position on the steady-state roughness is investigated. Based on obtained experimental results, the dependence graphs of material removal and roughness on the processing time are constructed. The comparative analysis of the part surface position influence on material removal and the steady-state roughness during vibro-abrasive processing is carried out. The results showed that material removal volume from the internal surface more than from the external for short part length, however material removal volume from the external surfaces grows significantly in case of part length increasing, while from the internal surfaces is not significant. It is established that the internal surface steady-state roughness is ∼1.55 times higher than external surface steady-state roughness after processing in triangular prism 15×15, grit 16.
The Main Ways to Control the Efficiency of Vibration Abrasive Processing
Authors: Prokopets Anatoly , Shenstein Vitaly , Prokopets Tatiana , Melnikova Elena 
Published: December 2021

Abstract
The paper considers the main factors affecting the stability of the technological operation of vibration abrasive processing. The main ways of increasing the efficiency of processing by controlling its stability are revealed. The scheme of adaptive control of the process of vi-broabrasive machining is proposed according to the criterion of stability of the volume of loading of the working chamber, as one of the main factors that determine the stability of the cutting ability of the working medium (tool). The work substantiates the relevance of increasing the efficiency of vibration processing, as one of the promising methods of finishing. As a criterion of efficiency, the processing time was taken to ensure the specified quality indicators of the processed parts. Taking into account the peculiarities of vibroabrasive processing, three options for determining the minimum required processing time are proposed. In order to identify ways to increase the efficiency of processing, the analysis of the structure of the technological system was carried out, the classification of its elements was made. Based on the results of the analysis, it was concluded that a necessary condition for increasing the efficiency of processing is to ensure the stability of the parameters of the technological operation. In this regard, the main factors influencing the stability of the technological operation of vibration abrasive processing using the Ishikawa diagram are highlighted. The paper also presents the results of experimental studies of the influence of the volume of loading the working chamber on the cutting ability of the tool (working environment). Based on the results of theoretical and experimental studies, the main ways of increasing the efficiency of processing, including by controlling its stability, have been determined. The scheme of adaptive control of the process of vibroabrasive processing according to the criterion of stability of the volume of loading of the working chamber, as one of the main factors determining the stability of the cutting ability of the working medium (tool), is proposed.
Physical features of control of the surface relief of precision products
Authors: Shalygin Mikhail , Suslov Anatoly , Desyatskaya Lydia 
Published: December 2021

Abstract
The quality precision measurements of the product manufacturing or their surface treatment are considered. The importance of high-precision measurements at high speed, which does not require delivering the product to a special control laboratory, is shown. A precision laser measuring system is developed and manufactured, its kinematic diagram is presented and the calibration process is described. The verification of the measuring process results is given on the example of the parts obtained by polishing and grinding the surface. The dependence of the measurement error calculation is given, it is shown that the error of the measuring system is within acceptable limits. The presented measuring system has the capabilities of processing measurement results and constructing 3D images. Thus, the possibility of obtaining the surface topography parameters in accordance with ISO 25178-1, 25178-2 is shown. The methods of the surface treatment and filtering are used to improve the result accuracy of measuring the manufactured part quality, among which the elimination of the average slope, median filtering, and Wiener filter are described. It is shown that the highest accuracy of measurement results in the nanometre range with minimizing distortion losses is possible using the Wiener filter.
Effect of Wave Thermal Deformation Hardening on the Microhardness of the Surface Layer of Steel Parts
Authors: Kirichek A , Silantyev S , Fedonina S , Yashin A 
Published: December 2021

Abstract
Preliminary experimental studies of the possibility of increasing the microhardness of the surface layer of the material by the method of wave thermodeformational hardening on the example of austenitic steel class 12X18H10T are carried out. Comparative studies on the hardening of the material with and without heating were also carried out. The possibility of a significant increase in the maximum microhardness in the range from 25 to 50% at a depth of up to 0.6 mm, depending on the hardening mode, in comparison with the deformation treatment in the “cold” state is established. The area of technological modes providing the maximum increase of microhardness in the surface layer is revealed, in particular, the temperature of the treated surface should be in the range from 200°C to 400°C. At the same time, the achieved microhardness values exceed the initial one by 1.8…2.2 times, depending on the processing modes. It is also found that when choosing rational processing modes, the combined wave thermal strain hardening can significantly increase the hardening depth to 4.2 mm of the surface layer compared to the initial state. To establish the possibility of improving the performance of combined processing requires additional research.
The eddy-current and ultrasonic investigations of the nickel-base superalloy the gas turbine engine blades after exploitation
Authors: Gonchar A V , Mishakin V V , Klushnikov V A , Kurashkin K V 
Published: December 2021

Abstract
The work carried out microstructural, eddy-current and ultrasonic studies of the material of spent blades of gas turbine engines made of nickel-base superalloy. To determine the degree of damage to the material of the spent blades, studies of the microstructure were carried out on a scanning electron microscope. It was found that γ' coagulation occurred in some specimens, which corresponds to overheated material. Acoustic studies of the material were carried out using the ultrasonic pulse echo method. Comparative analysis showed that in such specimens there is a significant decrease in the velocity of propagation and attenuation of longitudinal ultrasonic waves. It is found that the readings of the eddy-current flaw detector in overheated specimens differ more than twice in comparison with non-overheated specimens. This fact can be used for operational non-destructive testing of the actual state of the metal structure by the eddy current method with the aim of further safe operation of gas turbine engines.
Research of the reliability of a robotic assembly based on the effect of rotation and low-frequency vibrations
Authors: Vartanov M V , Tran T T 
Published: December 2021

Abstract
Using various physical and technical effects in automatic assembly is a promising tendency to increase the technological reliability of the assembly process. The article presents a method for robotic assembly of cylindrical joints using the effect of rotational motion and low-frequency vibrations. The effect can be achieved by using low-frequency vibrations of the base part with the help of a vibrating device and the rotational movement of the installed part with the help of the rotational movement of the robot out-put link. The paper presented a mathematical model of the dynamics of the robotic assembly process of cylindrical joints. Experiments were set up and carried out to test the effectiveness of the proposed assembly method. The research results affirmed that with a rational technological mode of the robotic assembly process using the effect of rotation and low-frequency vibrations, the probability of jamming is completely eliminated and the assembly force is significantly reduced.
Improving the efficiency of machining on metal-cutting machines by aligning the CNC program and the evolutionarily changing cutting dynamics
Authors: Zakovorotny V L , Gvindjiliya V E 
Published: December 2021

Abstract
Modern machines with high accuracy provide an accordance of the trajectories of the executive elements to the CNC program. However, this is not guarantee the same accuracy of manufacturing the part. One of the main reasons for the formation of the geometric defects is the elastic deformations of the tool and the workpiece. It is caused by variations of the cutting forces, changes in the rigidity of the workpiece along the tool path. It depends on changes of the properties of the dynamic link formed by cutting. Therefore, there is a problem of synergetic aligning of controlled trajectories with changing cutting properties. In the article, the regularities of the alignment of external control and internal dynamics are considered on the basis of mathematical modeling of the system in which the trajectories of the executive elements are controlled. The case of accounting the a priori given law of changes of the stiffness of the workpiece is considered. The effectiveness of the alignment is estimated by the reduced costs while ensuring the required quality of the parts.