bluuebunny/crossref_metadata_2025_split huggingface dataset:
Simulation of Oscillation Frequency Effects on Complex Shape Part Milling
Authors: Yamnikov A S , Bogomolov M N 
Published: January 2021

Abstract
The study shows that auto-oscillations occur even at low-speed turning. The paper includes a literature review revealing the reasons for machining vibrations. It is difficult to analytically describe the physical processes in the cutting area, so we used simulation. Moreover, milling is the most difficult process to describe and research. The variable magnitudes/directions of the cutting forces resulting in extra auto-oscillations make the analysis even more complex. It is shown that reducing the cutting speed leads to lower vibrations, and to lower output, higher rigidity, and damping capacity. It is important to know the natural frequency of the workpiece to choose the right cutting mode. The finite element method and SoldWorks CAD models were used for simulating the complex shape part dynamic behavior. We found out that the workpiece natural frequency is 6.5 times higher than the forced oscillation frequency.
Surface Layer Formation at Dynamic Combined Exposure by Two-Component Electrode
Authors: Boldyrev A I , Kuzovkin A V , Boldyrev A A , Padurets A A 
Published: January 2021

AbstractThis article is devoted to the study of workpieces surface layer state, resulting from dynamic exposure of a two-component electrode with imposition of electric field. The objects considered in the work are details with complex profile. Such parts are used in aviation, rocket and space technology and in oil and gas industry. They include impellers and flow part of turbopump bodies, augers, blade wheels, which have areas of variable curvature with limited tool access to treatment area. The authors show that mixture in combined process of two-component processing media from current-carrying granules and conductive liquid medium supplied at high speed to the treatment area, provides the required quality of surface layer due to the combined dynamic exposures on the material being treated. The parameters combination of electric field and kinetic energy of conductive granules allows you to control the magnitude and depth of material hardened layer in treatment area. Experimental studies have shown the increase in resource and durability of critical assemblies for aerospace equipment and oil and gas apparatus.
Technological provision for vibration cleaning of products in preparing them for disposal
Authors: Lebedev V A , Ivanov V V , Vesnin V , Basenko G V , Pastuchov F A , Sanamyan G V 
Published: January 2021

Abstract
The article discusses one of the main stages of products’ preparation for disposal, providing for their cleaning from contamination; it is shown that the most promising methods of cleaning treatment are the mechanochemical cleaning methods based on the use of a different vibration spectrum of the processing substance. Depending on the nature of contamination, the material and shape of the processed parts, the conditions of vibration cleaning (mode, working environment, washing and dissolving liquids) can be varied. Based on the studies carried out, it has been established that the vibration cleaning of the surface depends directly on the work of the influence force on contamination which, in turn, depends on the dynamic activity of the particles of the working environment and the gravitational activity of the process fluid. An energy condition and calculated dependencies are proposed that can be used in the development of vibration cleaning technology for specified contaminants and product materials when solving a specific applied problem, as well as developing and optimizing the vibration cleaning process for products, describing and justifying the influence of mechanochemical phenomena on the intensification of the cleaning process in order to identify technical and economic effect from the use of vibration processing method.
Assessment of the mechanical properties of welded joints after wave strain hardening
Authors: Kirichek A V , Barinov S V , Silantyev S A , Aborkin A V , Yashin A V 
Published: January 2021

Abstract
The purpose of this work is to establish the relationship between the modes of wave strain hardening (WSH) and changes in the ultimate strength, microhardness, impact strength of welded joints. The need for these studies is associated with the prevention of destruction of welded joints with the help of their subsequent WSH. The uniqueness of the WSH method lies in the wave loading of the processed material by shock pulses with a given duty cycle, energy and duration. This makes it possible to increase microhardness and form compressive residual stresses at a depth of more than 10 mm, which makes the use of the method promising for increasing the strength of welded seams. These studies have not previously been conducted. Materials 10XCHД, 30XГCA and 40X were taken as objects of research, from which important welded products are often made in industry. As a result of the research, based on the conditions for increasing the strength of welded joints of the selected materials, rational modes of strengthening and the direction of processing have been determined.
Regularities of technological inheritance in the categories of loading programs
Authors: Blumenstein V Yu , Krechetov A A 
Published: January 2021

Abstract
The paper presents an approach to describing technological inheritance as a pattern of changing loading programs under the influence of the loading history of the metal of the surface layer at the previous stages of processing. The loading program represents the regularity of the accumulation of deformation under conditions of a change in the stress state in the process of deformation and determines the regularities of the accumulation of metal damage during the processing and operation of the product. The proposed approach makes it possible to assess the accumulation of deformation and damage to the metal of the surface layer at all stages of the product life cycle.
High-speed pneumomechanical drive of the executive movements of machine mechanisms
Authors: Prikhodko S P , Sidorenko V S , Kharchenko A N , Grishchenko V I 
Published: January 2021

Abstract
This paper presents a technical solution for a high-speed positional pneumatic actuator of the executive movements of technological equipment, and also developed a mathematical and computer model. The method of solving the differential equation in the SiminTech program is used. The result is an oscillogram of transient processes. The resulting models allow for dynamic analysis of pneumo-mechanical systems. This article presents graphs constructed in the computer program SimInTech, the dependence of the angular velocity and angular displacement on time. A mathematical model is written that is confirmed by a computational experiment.
Design of control laws for rotary inverted pendulum based on LQR and Lyapunov function
Authors: Nguyen C X , Tran Th Tr , Pham Th X , Le K M 
Published: January 2021

Abstract
In this paper, a new technique for synthesizing control laws of stabilizing rotary inverted pendulum is proposed. The key of the proposed method is combination of linear quadratic regulator (LQR) method and Lyapunov function such that the control system can achieve higher performance. The Lyapunov function-based methods guarantee the globally approximate stability; however, they face to the difficulty of constructing an effective Lyapunov function. On the other hand, the LQR-based methods have been shown the ability to achieve high performance only if the control system has a weak nonlinearity and/or operate around equilibrium point. Combining them may partially deal with their limitations. The effectiveness of the proposed method is examined by experiments on the rotary inverted pendulum and compared with the LQR method. The results show that the proposed method has achieved a better performance.
The design of a quasi-time optimal cascade controller for ball and beam system
Authors: Nguyen C X , Phan H Ng , Hoang L D , Tran H Ng 
Published: January 2021

Abstract
In this paper, a methodology for designing quasi-time optimal cascade controller for ball and beam system is presented and the result is compared with LQR method as well as implemented on real system. Ball and beam system is a highly non-linear system, its parameters are difficult to estimate accurately and easily affect by disturbance. In designed method, a mathematical model describing the system is built, including a motor that creates a rotation of beam and is divided into two subsystems when synthesizing the cascade controller for the system. The first floor is the beam subsystem with the output is the angle as the set value for the second floor, which is ball subsystem. The controller is synthesized for each subsystem based on the quasi-time optimal control. The advantage of this method is the synthesizing control law with non-linear system. The simulation results show the effectiveness of the proposed design.
Two-dimensional plan source, vortex and vortex source
Authors: Kokhanenko V N , Burtseva O A , Alexandrova M S 
Published: January 2021

Abstract
Modern hydraulic structures require highly reliable water-supply channels, free-flow pipes and open spillways. Therefore, they must be built with considering dynamic properties of the affecting flow. The theory of one-dimensional open flows cannot answer many questions raised by the hydraulic engineering practice. Hence, this paper considers two-dimensional graphical open flows, with separate particular models following from the general theory, important for designing couplings, curves in more complex constructions (two different channels) required in hydraulic engineering (Hydraulics technical structures) (HTS). And the more such models are obtained, the more opportunities will appear for scientists and designers to synthesize more complex structures required in HTS.
This study identifies three elements, and three simplest models of two-dimensional graphic open water flows similar to flat models: a source, a vortex and a vortex source. The number of such individual models will continue to increase and expand the range of possibilities for designing more complex water technical objects (WTO).
The models are obtained analytically from solving the system of two-dimensional graphical open potential water flows in the plane of the velocity hodograph. The elementary construction of each model includes an analytical solution for the potential function and the stream function.
The paper considers the problem of determining the parameters of a two-dimensional graphical open water flow at any point in the flow: a source, a vortex, a vortex source. The practical significance of the models lies in the possibility to use the results by the designers of hydraulic structures both at the first stage of solving problems and at the subsequent ones, with flow resistance forces taken into account.
The study also represents the transition method from the plane of the flow velocity hodograph to the flow diagram by integrating the models in the plane of the velocity hodograph from the condition of the connection between the considered planes.
Alignment the controlled trajectories of the machine’s executive elements with the properties of the cutting system
Authors: Zakovorotny V L , Gvindjiliya V E 
Published: January 2021

Abstract
The article considers the task of alignment of trajectories of machine executive elements set by CNC-system with evolutionarily changing properties of the cutting process in such a way that minimize the wear intensity. Consequently not position optimizes in the space of the technological regimes but its trajectories are harmonized with changes of the properties of the manufacturing process. The definition of trajectories is considered from the point of view of synergetic mutually agreed interaction of external control and internal dynamic of the cutting system.
The study of alignment is performed on the basis of constructing mathematical models of a controlled dynamic system and performing digital experiments for a cutting system, the parameters of which and tool wear depend on the phase trajectory of the power of irreversible energy transformations in the cutting zone. Based on the research, new directions for improving the efficiency of cutting processes on CNC machines are proposed, which allow increasing the productivity of the cutting process without changing the requirements for the quality of manufacturing parts.
RETRACTED: Composite antifriction coating modified with copper complex and fluoropolymer
Authors: Shcherbakov I N 
Published: January 2021

Abstract
A composite antifriction coating modified with copper complex and fluoropolymer has been developed. Studies were carried out on the effect of modifiers on obtaining a solid lubricating coating of a certain thickness, depending on the heat treatment modes, and measurements of friction and adhesion coefficient were carried out. This coating can be used in friction units of machines and mechanisms operating in an air environment with frequent cyclic loads, temperature drops, as well as in vacuum. On the basis of experimental data, the optimal structure of the composite coating components has been developed.
Efficiency analysis using complex ultrasonic vibrations in electroacoustic spraying of axial cutting tools
Authors: Kudryshev S B , Naumenko V A , Zakalyuzhnyy A A 
Published: January 2021

Abstract
The article considers the electric spark intensification doping methods by using ultrasonic vibrations to obtain the method of electroacoustic deposition. The ultrasonic vibrations use in the deposition process is possible due to the use of an acoustic system at the end of which a naturally swirled waveguide is used. To analyze the waveguide oscillation amplitude dependence on the frequency, the article presents analytically obtained dependences of the longitudinal and torsional components of vibrations. The obtained results reliability of theoretical studies is confirmed by the good convergence of the theoretical and calculated frequency response resonant peaks. The electroacoustic deposition effectiveness method is confirmed by experimental studies of maintaining the hardened drills performance. The experimental data analysis showed a 2-4 fold increase in the total durability period of hardened drills.
Numerical solution of mathematical physics problems by the collocation method
Authors: Shcherbakova E E , Knyazev S Yu 
Published: January 2021

Abstract
A modified collocation method for the numerical solving boundary value problems of mathematical physics is proposed. The irregular arrangement of collocation nodes in the problem solving domain can sharply increase the accuracy of the numerical solution by improving the quality of the linear algebraic equations system, to which the solved boundary value problem leads. Various basis functions systems are considered. The proposed method allows one to obtain an approximate solution of boundary value problems for a wide range of linear and nonlinear elliptic, parabolic and wave equations in an analytical form. This numerical method makes it possible to significantly expand the application field of traditional numerical methods when solving applied problems for modelling fields of various physical natures, described by linear and nonlinear equations of mathematical physics. The developed method is used to solve a quantum-mechanical problem for a hydrogen molecule ion. The results obtained in this work show the high potentialities of the complete collocation method, which are based on the universality of the method and high accuracy of numerical solutions. The energy of the ion ground state calculated with the minimum number of collocation nodes differs from the experimentally obtained value by 13%.
Simulation of pneumatic actuator position system for long stroke mounting movements
Authors: Sidorenko V S , Korotych D A , Grishenko V I , Kharchenko A N 
Published: January 2021

Abstract
The creation of new equipment and technical means for the implementation of promising processes and technologies is largely determined by the level of development of mechanical engineering. The most important requirements for technological equipment are an increase in work processes, flexibility and adaptability, automation, implementation of complex algorithms of executive movements. The mechanisms of executive movements ensure the operation of transporting, fixing and other target mechanisms, this largely determines the quality and efficiency of processing processes. Positional actuators have existing technical solutions. However, to a greater extent they relate to linear movements realized by rod cylinders, this does not allow adapting the results of existing research to the development of long-stroke positional movements. In the course of this work, an assessment was made of the existing types of drives and a displacement and position measurement sensors. The proposed positional pneumatic scheme allows solving the problem of positioning long-stroke displacements, its mathematical and computer models were built, and dynamic analysis and conclusions were made.
Combined pneumatic drive of the rotary-dividing mechanism of the revolver head
Authors: Dolgov G A , Sidorenko V S , Grishenko V I , Kharchenko A N 
Published: January 2021

Abstract
Currently, the use of a positional combined drive in metal-cutting equipment must have a high-precision ability to process new materials, the design of workpieces and parts; ensure the technical and environmental safety of personnel, etc. All these requirements must be met by CNC machines to produce competitive products in the market criteria. Metal cutting equipment due to its high cost has led to the need to use a single power source for multiple work movements. To increase the productivity of the machine, it is necessary to use a combined two-motor positional pneumatic drive. This increases the total production time. reduce the main time (by automating two movements: rapid supply of the workpiece to the processing center, and reduce the auxiliary time (automating the installation of the workpiece and removing the part, reducing the path of movement of the tool), reduce the time for equipment changeover (using digital display and software control). The section “research results” presents the results of mathematical modeling based on a computer model implemented in the SimInTech software package. The graphs of pressure dependences in the piston and rod cavities of the pneumatic cylinder, speed and displacement of the pneumatic cylinder are obtained.
Optimization of dynamically loaded nonlinear technical systems
Authors: Shapovalov V V , Kharlamov P V , Gorin S L , Mischinenko V B , Kornienko R A , Zinovev V E 
Published: January 2021

Abstract
Modeling and simulation technologies play an important role in the operation, diagnosis of the current state and prediction of changes in various mechanical systems. The most effective approach for the study of nonlinear friction systems is the use of the method of physical and mathematical modeling, which is based on the construction of a mathematical model of a quasi-linear subsystem of a machine or mechanism and the creation of a physical model of a substantially nonlinear friction subsystem. Fundamentally new approaches have been developed to solve the problems of optimization, increasing the efficiency and competitiveness of non-linear technical systems using the example of the wheel-rail tribosystem. Proposed technology of metal cladding of locomotive wheel band and implementation of anisotropy of friction coupling provide significant increase of efficiency of “wheel-rail” tribosystem.
Schemes of high-voltage rectifiers as part of dust removal electric gates
Authors: Yurov A A , Minkin M S , Kuimov D N 
Published: January 2021

Abstract
The problem of controlling emissions of dust fractions from various types of technological machines and containers during the production and transportation of bulk materials in the construction and metallurgical industries is quite urgent, due to the need to ensure environmental protection. The development of an energy efficient and inexpensive air filtration system can be an optimal solution to this problem. An important part of this system is the power supply. Measures aimed at increasing load characteristics of circuits of high-voltage rectifiers as a source of high DC voltage of negative polarity of dust collecting electric locks are considered in this work.
Structure, phase composition and properties of borowolframed coating on steel 20 after microarc chemical heat treatment
Authors: Davidyan L V , Dombrovskii Yu M 
Published: January 2021

Abstract
The results of the research devoted to the study of structure, phase composition, micro hardness and wear resistance of the borowolframed coating on steel 20, that was obtained by the method of microarc chemical heat treatment, are presented. With the help of microrentgenospectral analysis, it was found that during microarc borowolframing, both grain-boundary and trans crystallite diffusion of boron, carbon and tungsten occurs, which avoided the formation of brittle carboborid eutectics along the boundaries of plastic grains of the layer base. X-ray phase analysis in the diffusion coating found iron and tungsten borides Fe2B and W2B5, tungsten carbide WC, boron nitride BN and iron intermetallic with tungsten Fe7W6. The micro hardness of the borovolframed layer was 12-13 GPa. The wear rate of the borowolframed samples is reduced by 4.4 times in comparison with steel 20 in the initial structural state.
Evaluation of wear resistance of boron-containing layers on steel 20 after microarc surface alloying
Authors: Davidyan L V , Dombrovskii Yu M , Chumachenko G V , Balinskaya M V , Asten T B 
Published: January 2021

Abstract
The evaluation results of abrasive wear resistance on a friction machine K4-B of boron-containing coatings on steel samples are presented in this paper. It was obtained with the method of microarc chemical heat treatment from coatings. Samples of steel 20 with a diameter 4 mm and a length 30 mm were tested after microarc borating, borovanadium treatment, boro-molybdenation and borochromization. It was identified that after borating with microarc heating, the wear rate decreases by 3.04 times in comparison with the wear rate of the reference - steel 20 in the initial structural state. Microarc multicomponent saturation, when borides, carbides, and more complex substances that contain chromium, molybdenum or vanadium were found in the diffusion layer, significantly reduces the wear rate of steel products up to 4.4 times in comparison with the initial state.
The effect of the selective laser melting mode on second phases precipitation in 316L steel during subsequent heat treatment
Authors: Popkova D S , Ruslanov I M , Zhilyakov A Y , Belikov S V 
Published: January 2021

Abstract
The object of the study was 316L steel obtained by the method of selective laser melting (SLM). The structure of 316L steel was investigated after different SLM modes. The effect of different SLM modes on the second phases precipitation after heat treatment was studied. It is revealed that the fraction of precipitates of the χ-phase correlates with the energy density of the laser beam during SLM.
Identification of the second phases formed in VDM® alloy C-4
Authors: Pyrin D V , Popkova D S , Zhilyakov A Y , Belikov S V 
Published: January 2021

AbstractThe electrochemical extraction of the second phase in the VDM® alloy C-4 alloy has been studied by transmission and scanning microscopy, as well as by X-ray phase analysis. It was found that annealing, which consists in heating up to 850 °C with further holding for 32 hours and cooling in a furnace, leads to the precipitation of a second phase in VDM® alloy C-4 alloy. It can lead to embrittlement and a general decrease in the corrosion resistance of the alloy. The precipitation of the anode deposit (the second phase in the samples of the VDM® alloy C-4 alloy after annealing) and its identification was carried out by the methods indicated above.