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Vol 39, No 9 (2019)

Article

Change in Limiting Channel Dimensions during Pneumatic Shaping of Multilayer Structures

Larin S.N., Platonov V.I.

Abstract

A mathematical model is developed for determining the inert-gas pressure within rectangular channels in multilayer structures. The model permits calculation of the pressure, stress, and damage in the shaping of materials with different properties. The influence of the relative channel height on the relative limiting rounding radius of a corner element and the membrane thickness and also on the failure time for titanium (VT6S) and aluminum (AMg6) alloys is investigated. The deformation processes are described by the energetic and kinetic theories of creep and damage for viscous flow.

Russian Engineering Research. 2019;39(9):721-725
pages 721-725 views

Modal Diagnostics of Lathe Designs with Composite Bases

Utenkov V.M., Dos’ko S.I., Molchanov A.A., Brengauz A.R.

Abstract

The basic damping properties of composite lathe structures are analyzed by modal diagnostics. New experimental results and literature data from non-Russian research are employed. The damping properties of cast-iron and composite lathe structures are compared. The composites considered are ferrocement, polymer concrete, and metal concrete.

Russian Engineering Research. 2019;39(9):726-731
pages 726-731 views

Influence of Input Acceleration of Broad-Band Random Vibrations on the Amplitude–Frequency Characteristics of Hydraulic Bearings

Gordeev B.A., Lyubimov A.K., Okhulkov S.N., Titov D.Y., Ermolaev A.I.

Abstract

The amplitude–frequency characteristics of hydraulic bearings under the action of broad-band random vibrations with different input root-mean-square acceleration are investigated. The damping of the vibrational signals by the hydraulic bearings is studied experimentally.

Russian Engineering Research. 2019;39(9):732-738
pages 732-738 views

Frictional Properties of Laser-Applied Coatings

Roshchin M.N.

Abstract

Laser application of wear-resistant coatings is considered. The conditions of coating application are outlined, and the results of wear tests on the coatings are presented.

Russian Engineering Research. 2019;39(9):739-741
pages 739-741 views

Influence of the Properties of Machining Fluids on the Frictional Coefficient in Alloy Turning

Kisel’ A.G., Rogachev E.A., Evdokimova O.P., Sergeev V.A., Balova D.G.

Abstract

Abstract—In the cutting of four different alloys, the effectiveness of two machining fluids is investigated as a function of their composition and physical properties. An index characterizing the influence of each chemical element in the fluid on its effectiveness is proposed.

Russian Engineering Research. 2019;39(9):742-744
pages 742-744 views

Production of Large Disks from Cylindrical Blanks by Plastic Deformation. 4. Deformation of a Protrusion by an Annular Punch

Vorontsov A.L.

Abstract

The deformation of a protrusion by a peripheral annular punch is mathematically described. The protrusion is formed as a result of central-punch introduction in the manufacture of large disks or hard-to-deform disks by plastic deformation. The maximum force at the end of deformation is found. The relative radius of the annular punch ensuring equal stamping forces for the central and annular punches is determined.

Russian Engineering Research. 2019;39(9):745-748
pages 745-748 views

Pore Formation in the Laminar Structure of Wear-Resistant Modified Powder Coatings

Vinokurov G.G., Struchkov N.F., Bol’shakov A.M.

Abstract

The open porosity of wear-resistant modified coatings is investigated, and their macrostructure is analyzed. A statistical method is proposed for describing the formation of porosity in the laminar structure of a powder coating. The matrix of transition probabilities is determined for a uniform Markov chain. The porosity of a coating on a smooth substrate is calculated.

Russian Engineering Research. 2019;39(9):749-754
pages 749-754 views

Surface Microhardness of Parts Machined by Asymmetric Uninterrupted Lapping

Gafarov A.M., Sharifov Z.Z., Gafarov V.A.

Abstract

To improve the wear resistance of high-precision machine parts, a new technology has been developed: asymmetric uninterrupted lapping. The influence of its basic parameters on the surface microhardness is investigated. The optimal parameter values corresponding to maximum surface microhardness are determined.

Russian Engineering Research. 2019;39(9):755-760
pages 755-760 views

Selection of a Cutting Tool by Means of a Digital Model

Kabaldin Y.G., Shatagin D.A., Kuz’mishina A.M.

Abstract

A digital model of a cutting tool produced by neural-network modeling is considered. By means of this model, the composition and structure of a wear-resistant coating may be optimized. The machining conditions that ensure maximum wear resistance of the tool may also be identified.

Russian Engineering Research. 2019;39(9):761-765
pages 761-765 views

Current Regulation in Contact Welding

Klimov A.S., Antsiborov A.N., Klimov V.S., Kudinov A.K.

Abstract

Algorithms for current stabilization in the control of contact welding are considered. The proposed method for specifying and maintaining the welding current permits correction of the thyristor firing angle by means of an approximate formula taking account of the measured current-pulse parameters in phase regulation. The proposed method simplifies the equipment and increases the efficiency of regulation.

Russian Engineering Research. 2019;39(9):766-771
pages 766-771 views

Software for Tool Design and Testing

Khodzhibergenov D.T., Ibragimova Z.A., Khodzhibergenova U.D., Abdukarimov A., Sherov K.T., Esirkepov A.

Abstract

The development of software for calculating the cutting parameters in the course of machining or in simulations is discussed. The software developed may be used to create and test new cutting tools.

Russian Engineering Research. 2019;39(9):772-775
pages 772-775 views

Energy-Efficient Actuator for the Control System of Promising Vehicles

Makarenko A.V., Kuznetsova E.L.

Abstract

A mathematical model is developed to describe the energy-efficient actuator of control systems for promising autonomous vehicles (drones, torpedoes, etc.) with different current sources. The energy and dynamic characteristics of control systems with different power supplies are compared.

Russian Engineering Research. 2019;39(9):776-779
pages 776-779 views

Verification of Feasibility Studies at High-Technology Enterprises

Dmitriev O.N., Novikov S.V.

Abstract

Innovation and investment in the development of high-technology enterprises must be preceded by thorough feasibility studies. The potential errors in the associated management decisions may be categorized. In the light of such potential errors, feasibility studies must be verified by qualified and impartial experts, with a final verdict regarding the presence or absence of significant errors and perhaps recommendations for improvement. In the present work, the most common approaches to expert verification are categorized, and proposals are made regarding the development and synergetic combination of such methods.

Russian Engineering Research. 2019;39(9):780-781
pages 780-781 views

Mutual Influence of Capillary Pumps in Heat-Pipe Systems with Different Evaporator Loads

Borshchev N.O., Sorokin A.E., Belyavskii A.E.

Abstract

Thermal management systems that are not hermetically sealed have been developed for use in spacecraft; in such systems, scientific equipment and instruments operate in open space. Accordingly, new methods of thermal regulation have been developed: axial and loop heat pipes; and honeycomb thermal panels with embedded axial heat pipes. Heat transfer in heating systems with heat pipes is based on evaporation and condensation in a two-phase loop. The working fluid moves under the action mainly of capillary forces that appear in capillary channels or honeycomb structures for axial heat pipes and in the porous heated medium (capillary pump) of the loop heat pipes.

Russian Engineering Research. 2019;39(9):782-784
pages 782-784 views

Manufacture of the Transceiver Housing for an Active Phased Array Antenna with Built-In Cooling Channels by Selective Laser Melting

Rabinskii L.N., Tokmakov D.I., Solyaev Y.O.

Abstract

A cooled transceiver housing of an active phased array antenna is produced by 3D printing from aluminum, on the basis of selective laser melting (SLM). The housing walls contain cooling channels, whose geometry ensures effective heat transfer from the active electronic components of the transceiver and also permits the manufacture of high-quality samples on existing 3D printing systems and facilitates cleaning of the channels after printing. The housing is made of AlSi10Mg aluminum, with an acceptable content of closed pores (no more than 1%). Its physicomechanical properties correspond to those of regular aluminum alloys used in the traditional manufacturing technology for such components. This housing may be used in advanced radar systems. The research permits recommendations for further development of the technology.

Russian Engineering Research. 2019;39(9):785-788
pages 785-788 views

Preliminary Geometric Verification of the Electronic Model in Additive Manufacturing

Ripetskii A.V.

Abstract

Prior to additive manufacturing, the geometric compatibility of the electronic model with the capabilities of the equipment must be verified. The significance of the technological constraints in terms of potential production problems is analyzed.

Russian Engineering Research. 2019;39(9):789-792
pages 789-792 views

Stability of Panels of a Thermoelastic Shell Heated at the Edge by a Mobile Point Source

Zhavoronok S.I., Kurbatov A.S., Orekhov A.A., Rabinskii L.N.

Abstract

The thermostability of thin-walled structures is considered by means of a thermoelasticity problem in a three-dimensional quasi-static formulation. Finite-element models of panels in the form of a circular cylinder and a plate reinforced by ribs are constructed. Numerical solutions are obtained for the stability loss of thermoelastic thin-walled reinforced structures with intense edge heating by a mobile heat source.

Russian Engineering Research. 2019;39(9):793-796
pages 793-796 views

3D Printing of Components for the Gas-Discharge Chamber of Electric Rocket Engines

Pogodin V.A., Rabinskii L.N., Sitnikov S.A.

Abstract

A technology is developed for 3D printing of the large-diameter gas-discharge chambers of electric rocket engines. The material employed is a ceramic composite based on silicon nitride.

Russian Engineering Research. 2019;39(9):797-799
pages 797-799 views

Composite Heat Shields in Intense Energy Fluxes with Diffusion

Rabinskii L.N., Tushavina O.V.

Abstract

A method is proposed for bench testing of reusable composite samples under intense thermal and ionizing radiation. Tests are conducted under intense energy fluxes. As a result of the tests, the temperature field and the displacement field at the surface of heat-shielding composite and in its depth are determined at different times. The proposed mathematical model adequately determines describes the temperature distribution in the composite shield under the action of intense energy and radiation fluxes. The influence of diffusion and the temperature field on the displacement field in the composite is studied. The theoretical results are compared with experimental data.

Russian Engineering Research. 2019;39(9):800-803
pages 800-803 views

High-Temperature Protective Coatings on Carbon Composites

Lifanov I.P., Yurishcheva A.A., Astapov A.N.

Abstract

Research on high-temperature coatings for the protection of heat-proof carbon composites from oxidation and ablation in high-speed high-enthalpy fluxes of oxygen-bearing gas is analyzed. A promising coating architecture with excellent protective properties is established.

Russian Engineering Research. 2019;39(9):804-808
pages 804-808 views

Ultrasonic Application of Nanostructured Coatings on Metals

Bulychev N.A., Kuznetsova E.L.

Abstract

A method is developed for applying metallic, intermetallic, or ceramic coatings to a metal surface by means of ultrasound (high-frequency acoustic vibrations). The method may also be used to reinforce metallic surfaces by means of particles of another metal or ceramic. Under the action of ultrasound, chemical reactions and solid-phase diffusion are accelerated. That is accompanied by strong adhesion of the metal matrix to the particles; solid-phase transformations; and the formation of intermetallides, oxides, carbides, nitrides, and other compounds, depending on the surrounding gas and the powder composition. As a result, a composite coating or layer with nanostructure or microstructure is formed on the surface.

Russian Engineering Research. 2019;39(9):809-812
pages 809-812 views

Creating an Atmosphere within Spacecraft

Strogonova L.B., Sorokin A.E., Vasin Y.A., Belyavskii A.E.

Abstract

In space flight, the creation of an artificial atmosphere for those on board represents a serious challenge. New approaches produce environmentally and physiologically satisfactory conditions for prolonged human residence and optimize the heat and mass transfer in the spacecraft. That reduces the impact of space flight on human passengers and thereby minimizes health hazards. This is especially important in regard to plans for piloted flights to other planets, in the light of their duration and the demands placed on those on board.

Russian Engineering Research. 2019;39(9):813-815
pages 813-815 views

Environmental Impact of Paints in High-Tech Production

Sorokin A.E., Bulychev S.N., Gorbachev S.I.

Abstract

Assessment of the environmental impact of paints and varnishes is based on life-cycle analysis. A method is outlined for calculating the index and coefficients of environmental safety of the paints. Such assessments not only permit optimization of the paint composition in environmental terms but also selection of the safest coating from those available.

Russian Engineering Research. 2019;39(9):816-819
pages 816-819 views