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Russian Engineering Research
Journal Prestige (SJR): 0.278  Number of Followers: 0  Hybrid journal (It can contain Open Access articles)ISSN (Print) 1934-8088 - ISSN (Online) 1068-798X Published by Springer-Verlag  [2468 journals]
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- Vibrational Diagnostic Indicators of Assembly Defects in Transmissions
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Abstract: The influence of the most significant7 defects in transmission shafts—imbalance and misalignment—on their vibrational behavior is investigated. Reliable diagnostic indicators of defects are proposed on the basis of vibrational signal analysis.
PubDate: 2023-04-01
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- Fast Magnetic Abrasive Finishing with Diffusionally Alloyed Powder
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Abstract: General information is presented regarding magnetic abrasive finishing (MAF) and the abrasive powders employed. This technology proves most effective in the finishing of complex components and also in machining internal surfaces components that are largely inaccessible by traditional wheel grinding. The requirements on the ferromagnetic abrasives employed are noted. Such powders are characterized by great surface hardness and good magnetic properties. Data are presented regarding the types of powder employed, their production, and their advantages and disadvantages. New ferromagnetic abrasives produced by diffusional alloying of iron-based powder are proposed. The new diffusionally alloyed powders decrease surface roughness by a factor of 4–5: machined surfaces of roughness Ra = 0.01 µm are possible. The properties and structure of powder produced by differential boriding of iron (Fe) powder of diameter 25–50 µm are inve-stigated.
PubDate: 2023-04-01
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- Low-Temperature Behavior of a Frictional Pair: Powder Coating and Metal
Counterbody-
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Abstract: A low-temperature test bench is developed for studying the low-temperature wear of frictional pairs based on powder coatings. The tribological properties of frictional pairs at low temperature are analyzed. Their wear is studied. The temperature variation of a frictional pair in cold startup of a mechanism is determined. Laws describing coating and counterbody wear are derived.
PubDate: 2023-04-01
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- Density Distribution of Compressor Seals and Powder Motion on Pressing in
a Closed Mold-
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Abstract: Information is provided regarding the density distribution of seals made of cast-iron composites and the particle motion in cold molds on cold pressing. The influence of the mold’s shaping kinematics on the density distribution over the height of the sleeve-type seal is assessed. The deviation from the mean workpiece density over the height is less in bidirectional pressing than in unidirectional pressing. The relation between the pressure on the workpiece and the compaction mechanism is analyzed for different pressing procedures.
PubDate: 2023-04-01
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- Properties of Electrospark Coatings
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Abstract: Electrospark machining is briefly described. The properties of the resulting coatings are investigated. The prospects for electrospark machining in reconditioning parts are outlined.
PubDate: 2023-04-01
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- Improving the Properties of High-Strength Steel for Critical Components by
Microscopic Additions of Vanadium and Nitrogen-
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Abstract: The influence of microalloying with vanadium or with vanadium and nitrogen on the properties of medium-carbon high-strength nickel–cobalt steel after heat treatment is investigated. Microalloying 30N9К4 steel with vanadium or with vanadium and nitrogen yields high ductility after quenching and high tempering. Modification of 30N9К4 steel with carbonitride phase after quenching and high tempering significantly increases its ductility, without loss of strength.
PubDate: 2023-04-01
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- Determining the Cut-Layer Thickness in Simulating the Machining of a Screw
Surface-
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Abstract: A method of calculating the cut-layer thickness is proposed in computer modeling of the milling of a screw surface.
PubDate: 2023-04-01
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- Virtual Torsional Tests of Carbon Fiber Tubes: Ansys Composite PrepPost
Software-
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Abstract: The specifics of virtual tests of a spacecraft component (a hollow tube) made of carbon fiber are considered. A theoretical model is proposed for torsional tests of the tube. Virtual testing on the basis of Ansys Composite PrepPost software is described. The data from theoretical calculations, physical tests, and virtual tests are compared, and the effectiveness of virtual tests is assessed.
PubDate: 2023-04-01
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- Boring Rod for Simultaneous Machining of Two Sockets in a Valve Housing
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Abstract: It is of great interest to ensure the required accuracy and surface roughness of saddle sockets in the housing of a direct-flow valve, without sacrificing productivity. To that end, a hydraulic boring bar has been developed to simultaneously machine the sockets in two opposed surfaces; the design is covered by an Inventor’s Certificate. When using the hydraulic boring bar, the positional precision is automatically guaranteed, and the productivity is doubled.
PubDate: 2023-04-01
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- Heating and Cooling of TN-1 Alloy Components with Shape Memory in Drives
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Abstract: The heating and cooling processes of components with shape memory in drives—in particular TN‑1 alloy drive components — are analyzed. Wire, plate, and rod elements are investigated by computer modeling, and the associated heat-transfer processes are considered. Cyclic operation of the components is proposed.
PubDate: 2023-04-01
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- Assessing Projects for Drone Development
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Abstract: One of the most promising developments in aviation today is the production of unpiloted aviation systems (drone systems), which is a science-intensive and high-tech endeavor. The market for drones is rapidly developing. Today, drones have both military and commercial applications and are of growing popular interest in many countries. Total investment in drone projects increases each year. Therefore, effective means of assessing such projects are essential in making sound investment decisions. In the present work, a method is proposed for determining the optimal expenditure of effort in drone development.
PubDate: 2023-04-01
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- ABS Plastic Composites Filled with Corundum Microspheres
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Abstract: The influence of the content of hollow corundum microspheres and their diameter on the thermal stability and fire resistance of filaments based on ABS plastic is investigated. Surface modification of the microspheres by organophosphorus compounds improves their thermoprotective properties, without loss of strength.
PubDate: 2023-04-01
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- Speed Stabilization in Rotation: An Analogy with Cyclotron Motion
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Abstract: A mechanical counterpart of cyclotron motion is found. The configuration of the corresponding device is determined; it may be called a stabilized rotor. The natural rotational frequency (speed) of the rotor is fixed. (It does not depend on the moment of inertia or the angular momentum.) Remarkably, it is the same as the natural oscillation frequency of a pendulum with identical parameters.
PubDate: 2023-04-01
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- Dimensional Structure and Precision in the Machining of Housing Components
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Abstract: Aspects of the dimensional structure and machining precision are considered. The method employed is analysis of the design, technological, and monitoring dimensions. The machining of components is considered on the basis of dimensional analysis. As an example, a gearbox housing is chosen; its machining by the simple operation categorized as 005 Vertical Milling is discussed.
PubDate: 2023-04-01
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- Metal–Polymer Frictional Systems for Motion of Different Types
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Abstract: In frictional systems, the temperature and working life of composite coatings containing fluoroplastics are studied experimentally, for motion of different types.
PubDate: 2023-04-01
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- Algebraic Reconstruction of Beam’s Spatial Characteristics in
Electron Beam Welding-
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Abstract: In electron-beam welding, stability of the beam’s spatial characteristics is essential in order to ensure weld quality. For diagnostics and determination of the beam’s spatial and energy characteristics, a Faraday cup is employed, in combination with computer tomography. In determining the current density distribution of the electron beam from the set of projections recorded, Fourier methods are generally adopted. Deficiencies of such methods include poor numerical stability and applicability to a very limited class of objects. To accelerate data analysis, increase the accuracy, and decrease the noise of the measurements, an algebraic approach is proposed, in conjunction with synchronous data accumulation. An algorithm is developed for algebraic derivation and reconstruction of the energy density distribution and monitoring of beam focusing. The two-dimensional current density distribution obtained by analysis is used to obtain the parameters of beam focusing, such as the diameter calculated from the width of the energy density distribution at characteristic levels; the area of the distribution curve or the null central moment of the distributed normalized by the maximum distribution density; and the effective diameter, indicating the interval in which 68% of the beam energy is incident.
PubDate: 2023-04-01
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- Gas-Turbine Blades with a Sintered Steel Fiber System for Transpiration
Cooling: Thermal Analysis-
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Abstract: Models of gas-turbine blades with transpiration cooling are considered; the cooling system is made of sintered stainless steel fibers. Calorimetry in a liquid-metal thermostat is used for thermal tests of the models. A method of thermal calculation is developed for the models; the method takes account of the porosity of the material. On that basis, dimensionless equations are obtained for four different blade designs. Increase in the number of channels ensures more uniform distribution of the air temperature in the blade cross section. As a result, the relative heat-transfer intensity \(\overline {\text{Nu}} \) increases with increase in area of the heat-transfer surface. Transpiration cooling increases the permissible gas temperature at the turbine input to 2200 K, with consequent increase in the life and reliability of the gas-turbine engine or gas-turbine system.
PubDate: 2023-04-01
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- Applications of Torsional Velocity Fluctuations
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Abstract: New applications of torsional velocity fluctuations are discussed. A design is proposed for a transmission with modulation of the spindle speed.
PubDate: 2023-04-01
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- Experiments on the Power Characteristics of Modernized Pneumatic Membrane
Actuators-
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Abstract: Experimental apparatus for determining the power characteristics of pneumatic membrane actuators with different design parameters is described. An empirical formula is derived for the working force developed by the pneumatic chamber in the initial stages.
PubDate: 2023-04-01
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- Speeding Up Preproduction
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Abstract: If the preproduction period is shortened, then new aviation products can be brought to market more quickly. Numerous changes in product design and manufacture require ongoing correction and even replacement of the technological equipment. Therefore, in the tool shops producing such equipment, the production program consists of two parts: (1) work on standard equipment; (2) work on urgent orders. The relation between these two components changes over time. Accordingly, production capacity must be kept in reserve in order to meet urgent orders. Prediction on the basis of an autoregressive model proves useful here.
PubDate: 2023-04-01
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