Abstract This article describes design features of welded or brazed joints of pieces made of materials with shape memory. The influence of welding and brazing on the properties of a shape memory alloy and shape memory work has been demonstrated.

Abstract An approach to the study of wave processes in the human cardiovascular system is presented in order to identify the constituent components in the complex signal of the pulse pressure wave—direct and reflected waves. This makes it possible to calculate the pulse wave propagation time and velocity, which are indicators that play an established role in the diagnosis and prognosis of cardiovascular

Abstract A promising method for obtaining a SiC-based ceramic construction material for products of complex geometry has been developed. It is suggested to carry out mechanical processing of prepared ceramic blanks, made using a temporary organic binder, before high-temperature sintering. This approach can be used in mechanical engineering and marine, aviation, and special equipment design.

Abstract This article proposes a wave technology for producing film composite materials based on native starch with Na-montmorillonite, which are intended for the prolonged release of biologically active compounds. It is shown that the use of wave effects at the stage of preparing a suspension for film composite materials promotes the formation of composites characterized by improved parameters of

Abstract The article presents a new design of a free power turbine for mobile industrial vehicles. It is a three-stage radial turbine placed directly on the generator shaft. This design represents a single unit of generator and free power turbine, which significantly increases the reliability of the unit, because it excludes additional mechanical units of torque transfer from the turbine to the generator

Abstract The problem of residual stresses that arise during the curing of products of polymer composite materials and cause warping (warpage) is considered. A calculation model is proposed that allows for the prediction of residual strains and design of predictive molding tools. The approach developed ensures a high accuracy of manufacturing articles of polymer composite materials. The influence of

Abstract In this article, by means of mathematical modeling, propagation of the response to a heat signal in the “human body–a gap–woven electric heater–heat-insulating layer–environment” heating system is analyzed. On the base of this study, we discover that the woven electric heater can act not only as a heater, but also as a receiver of external thermal signals caused by the impact of the heater

Abstract The modes of small oscillations are studied in a rod having an axis in the shape of a three-turn cylindrical helix using the expansion into oscillating eigenmodes and the method of vortex elements. Oscillationós are excited by pressure pulsations generated as a result of the processes of intense vortex formation when a spatial incompressible flow flows around the rod. The polyharmonic nature

Abstract Mixed parametric oscillations and self-excited oscillations in a system with a nonideal power source with delays in the elastic and frictional forces are considered. The direct linearization method is used for solving nonlinear equations. The stability conditions of stationary oscillations are determined. Calculations were carried out, and it appears that the delay leads to some interesting

Abstract The falseness of the idea about the independence of contact deformation of circular cylinders on their radius is shown. It is demonstrated that the total deformation of the roller and the plate is independent of the radius as observed in experiments with the roller compressed between two plates made of the same materials. It is stated that the known formula calculating the contact deformation

Abstract We study the damping efficiency of torsional vibrations of a body using a dynamic vibration damper containing a system of successive impactor pairs with magnets as colliding elements. Dimensionless essentially nonlinear differential equations of motion of the protected body and magnetic elements are obtained. The influence of the designed parameter selection of the vibration damper on the

Abstract In this paper, the literature data on the results of theoretical and experimental studies aimed at the development of the scientific foundations of evaluation of residual stresses in ferromagnetic materials according to the measurements of their magnetic parameters are analyzed. The data that indicate the reasonability of multiparameter control for the extension of the range of controlled

Abstract In this paper, we describe the concept of setting the base of large-sized parts with a diameter of up to 8300 mm and a mass of up to 120 tons, such as a bandage of a rotating cement kiln during machining using a mobile robotic machine. The issue of controlled cutting to ensure accurate shaping of a large-sized part with a thickness of the removed metal layer up to 6 mm is considered. Processing

Abstract The pattern of the interaction between powder particles and metal vapors is developed. To ensure a guaranteed supply of PAs to the heated region with the use of laser irradiation, a model for theoretically analyzing the motion paths of PA particles carried to the zone of construction with a gas jet in 3D Metal Printing is proposed.

Abstract In this article, on the basis of a refined theory, we study the stress state of a conical shell of the “boundary layer” type. In comparison with the classical theory, the sought displacements of the shell are approximated by polynomials along the coordinate normal to the median surface with a degree two units higher. Based on the equations of the three-dimensional elasticity theory and the

Abstract The antifriction properties have been determined experimentally for a carbon–carbon composite in the course of sliding friction against 40Kh13 steel in an environment of carbon dioxide. Changes in the friction coefficient upon heating to 800°C have been investigated in the velocity ranges from 0.05 to 0.25 m/s at a contact pressure ranging within 0.5–1 MPa. The novelty of the investigation

Abstract This work presents the results of studying of characteristics of wear resistance of gas-dynamic coatings obtained using electroerosive carbides, prepared by the method of electroerosive dispersing from wastes of VK8 hard alloys in distilled water and illuminating kerosene. Worn plates of the cutting tool from sintered hard alloys of the brand VK8 were used as dispersed material as well as

Abstract In this paper, we establish the scientific basis for the generation of intense hydroacoustic waves in a liquid as a result of the detonation of a stoichiometric mixture of hydrogen and oxygen. The idea of the possibility of carrying out this process with the help of a deep-water electrolyzer, which was confirmed experimentally, is expressed. The processes of combustion and detonation of a

Abstract This paper describes the results of the development of functional material represented by a dispersion-strengthened composition material based on aluminum and prepared by internal oxidation. Various types of tribological tests were employed; more specifically, friction tests of the specimens to determine the friction coefficient of the DSCM-brake shoe and tests of the specimens to determine

Abstract In this article, a model of the interaction between the jaw of a vibratory jaw crusher with the rock under processing in the form of a lump material is considered. To describe the motion of the rock and its sequential fracture into finer fragments, the crushing chamber is divided into zones of equal height. In each current zone, the material to be processed breaks into smaller fractions after

Abstract The potentialities concerning the combination of a cold-air minimum quantity lubrication technique (CAMQL) with a system for grinding-wheel cleaning by an air jet (WCJ) while grinding a heat-resistant nickel alloy are studied. The results of experimental studies show that, using the CAMQL + WCJ technique, the cutting force components are significantly reduced, the temperature of the contact

Abstract— The results of analysis of the dynamic properties of a vibrating technological machine with an electrodynamic actuator of oscillations during its operation under a nonlinear technological load are presented. The amplitude–frequency performances of the machine have been obtained, in both the idle and operating modes when the actuator is powered by current and voltage sources. The conditions

Abstract In the operation of modern gas and steam turbines, the amount of deposits on the aggregate surfaces inevitably increases (mainly in the form of amorphous silicon), which leads to metal corrosion and erosion damage. The relevance of solving the problem of removing technological pollution in the process of repairing gas and steam turbines in order to restore the design capacity of the equipment

Abstract This study presents a new variation of slider-crank mechanism designed by coupling a planar and a screw groups of zero mobility. In this mechanism the rotation of the driving link converts to the motion of the end-effector along a screw path. A detailed assembling computational model of the synthesized mechanism is presented, according to which kinematic and kinetostatic (force) analyses are

Abstract The results of study of the working process, the local heat transfer in the combustion chamber, and the thermal state of the piston of a hydrogen engine with an external mixture formation are analyzed. Studies of the local heat transfer coefficients were carried out using a 3D-CRFD-mathematical model developed and verified on the basis of the experimental results, first used to study a hydrogen

Abstract In this article, the concept of dynamically fractal structures (dynamic fractals) is introduced. The concept supposes that the dynamic, i.e., elastic–inertial, parameters of the constituent cells change on an equal scale. It is shown that a lengthwise descending dynamic fractal has the property of amplifying the input signal along the structure. On the contrary, a lengthwise increasing dynamic

Abstract A mathematical model of nonstationary rotation modes of the rotor of a centrifugal pump is built with allowance for the displacement of the rotor mass center relative to the rotation axis that causes vibrations in cooling systems of spacecraft. The process of acceleration and ascent of the rotor with subsequently reaching the mode of quasi-stationary oscillations is considered.

Abstract— This study is devoted to the features of friction of fluoroplastic-containing composite coatings under low-velocity loading.

Abstract In this paper, we substantiate of the possibility of reducing the weight and size characteristics of electric drives operating under high loads. To solve the problem, a geared motor design was developed. Unlike the existing analogues, the proposed design solutions are based on the use of wave transmission with intermediate rolling bodies, which allows obtaining high values of the gear ratio

Abstract The influence of a corrosive medium on the characteristics of endurance strength of samples of chrome–nickel steel 38KhNMA was considered. It was shown that, under the conditions of the impact of a corrosive medium, the issue that the endurance strength must be estimated by the results of statistical tests of laboratory samples while bringing the results of their processing in determination

Abstract This paper presents a mechanism with parallel structure that is classified to the class of l‑coordinate mechanisms. The section of the singularity zone (of the zone of singular positions) is determined for this mechanism. The section is constructed at a constant orientation of the output linkage.

Abstract The aim of this research is theoretical analysis and mathematical modeling of AC measuring transducers based on magnetodielectric cores for automation systems of oil refineries. An analytical study of the magnetization curve is carried out, an equivalent circuit is constructed, and a mathematical transducer model on its basis is obtained. A numerical study of the proposed transducer is carried

Abstract— The experimentally estimated effect of a waveguide on the acoustic emission signal parameters in the monitoring of high-curvature facilities has been studied. The frequency characteristics of the acoustic emission signals when passing from the pipeline to the waveguide remain almost unchanged, and the attenuation of the acoustic emission signals is no more than 2–3 dB.

Abstract The electric power industry is the most important branch of the national economy focused on the production of electricity and its subsequent transmission to the consumers. However, about 20 million people live in Russia in the areas (engulfing 70% of the territory of Russia) where there is no organized or centralized electricity supply. In these areas most of the territory is covered with

Abstract The deployment kinematics of a petal reflector is considered. An engineering approach to solving the partial problem of determining the sole rotation axis of the petal that provides for deployment of the reflector is proposed. The results of a numerical simulation of the deployment kinematics and the results of tests of the full-scale mockup are presented.

Abstract Article shows experimental results of thin ZnO films synthesis with required structure and thickness produced by different atomic layer deposition methods (normal temperature, thermal and photo-assisted deposition). The influence of the synthesis temperature and UV-irradiation on the characteristics of ZnO films was analyzed. Both amorphous and polycrystalline films were synthesized by changing

Abstract The tribotechnical characteristics inherent in steel–bronze and steel–cast iron and cast iron–bronze friction pairs separated by engine oil and by engine oil with the addition of a specialized additive have been studied. The introduction of the additive into the engine oil provides a reduced wear level for the samples. The best results concerning the friction coefficient have been obtained

Abstract On the basis of a transformer-type eddy current transducer, a measuring system has been constructed that allows one to estimate the possibility of using the eddy current method for measuring the thickness of conductive and dielectric coatings deposited on a conductive substrate. The design of the measuring system and the measurement techniques are described. Data that demonstrate the dependence

Abstract In this paper, we perform numerical simulation of stresses in the cutting wedge of ceramic plates of cutters when cutting persistent threads on high-strength materials in order to determine the permissible values of the cutting feeds at each pass. This method replaces a physical experiment that requires a lot of time and significant material costs, and this experiment must be performed again

Abstract This paper mainly studies evolutionary operations of interneuron synaptic structure search based on the developed structure synthesis algorithm for feed-forward multilayer network trained with a teacher. The decomposition of neural network learning tasks into a series of subtasks is proposed. During evolutionary search the neural network is not converted to a genotype and all the transformations

Abstract— This article describes a physical model of the application of a protective coating as well as an approach to mathematical simulation of thermal processes accompanying the application of a polymer coating on the surface of heat exchanger tubes, which allows us to estimate the temperature fields as a function of the material and thickness of heat exchanger tubes and the composition of the polymer

Abstract In this article a description of a vibration test system based on the EGV-10-100 test bench integrated with a control computer is provided. The test system is designed to solve a wide range of engineering problems related to the study and development of vibration protection systems. It is shown in which way the application sphere of the system can be considerably extended by improving it and

Abstract This paper presents modernization of the Neophot 21 microscope for metallographic analysis and automated photo processing for evaluating the quantity and size of grains, cracks, and other material defects.

Abstract This article is about reaching and securing high reliability and safety in engineering systems during the design and testing of developmental prototypes. A new approach to and technique of calculation of the design reliability is proposed, taking into account both kinds of failure rates, those that are constant and those that change over time. The function for calculation of design reliability

Abstract In this paper, we consider a mechanical oscillatory system with homogeneous elements: with n massive loads (multi-inert oscillator). The possibility of the appearance of free harmonic oscillations of loads in such a system is shown. Unlike the classical spring pendulum, the oscillations of which are due to the mutual conversion of the kinetic energy of the load into the potential energy of

Abstract— The origins of detrimental strains up to the destruction of parts and assembly units of mechanical facilities and outfits in contact with shape-memory alloys are considered. The characteristics of safe operations with shape-memory alloys, which can turn out of shape by themselves with significant strength parameters under certain conditions, are presented, as are the technological characteristics

Abstract This paper is devoted to solving the problem of motion of a rigid body with a cylindrical surface on a plane. The plane moves according to the harmonic law in the horizontal direction. The phenomenon of vibrational translation and its nature are described. The applicability of the problem and the main weak points in its study are determined. The law of motion of a cylindrical body on a vibrating

Abstract In this paper, the use of electric start-up systems with high-voltage current supply sources designed to start an internal combustion engine is encouraged. Experimental graphical dependences of the main parameters of electric starter start-up systems depending on the value of the energy storage capacity and the value of the initial charging voltage are presented. The dependences of the average

Abstract In this paper, the reasons affecting variations in nonuniformity of thermal fields in heating units based on carbon threads used in woven heaters are analyzed. One of them includes involving a large number of elastic filaments into the formation of the electric resistance and side-surface area of heating units. The novelty of the study of the thermal properties of a carbon thread consists

Abstract— This paper presents an analysis of changes in the mechanical properties of the EI-961Sh alloy under operation and the causes of fracture of the inlet guide vane blades. It is shown that early diagnostics and monitoring increase the performance reliability of the components of gas compressor units.

Abstract This work presents the results of studies of structural and physicomechanical characteristics of oxide-ceramic coatings obtained on aluminum by microarc oxidation in an alkaline silicate electrolyte with various contents of silicate ions using alternating and direct currents.

Abstract Bending oscillations have been studied for a pipeline on a movable support and a liquid contained therein under varying internal pressure. The case of the main resonance of steady-state nonlinear parametric pipe oscillations is considered, and an approximate analytical expression is obtained for the amplitude thereof. The results of approximate analytical and numerical solutions have been

Abstract— A method for measuring the precise geometric shape of a flexible elastic ring of a damper of a gas-turbine engine bearing is described. The ring stiffness is estimated analytically with account for the real measured geometry. A comparison with the experimental data is carried out. The recommendations on the numerical model with a real press fit of a flexible ring in the bearing are provided

Abstract In this paper we formulate and solve numerically the elastohydrodynamic problem about a heavy loaded contact of elastic bodies in the form of a profiled roller. Such contacts are typical for roller bearings and gears. The effect of the geometry of the inlet boundary of the lubricating film on the contact parameters (pressure, thickness of the lubricating film, and subsurface stresses distributions)

Abstract An accelerated method for determination of the stability of properties of alloys during their storage and subsequent application by studying the influence of the impact of radiation on the characteristics of shape-memory alloys is considered. The method allows for simulation of loading characteristics effective over the entire operating lifetime.

Abstract In this paper an analytical solution to the problem of determining the bearing stiffness and maximum roller load, as well as the number of loaded rollers, is given. Two loading diagrams of a bearing under radial force are considered: when it passes through the center of the fully loaded roller and when it passes between two fully loaded rollers. The problem is solved in the absence and presence

Abstract An analysis of the applicability of methods for evaluating the numerical values of the thermodynamic, critical, and physical properties of hydrocarbons and their C-, N-, and O-derivatives for the development of applied computational software for IBM compatible PCs are presented.

Abstract A dynamic model of ultrasonic vibroimpact treatment is constructed with the use of a vibrational system with two waveguides set with a gap: the one of them is excited by an ultrasonic generator and the other one serves as a passive resonant bearing. The rigid-plastic model is used for the material in the gap. Using the difference in the natural frequencies of the waveguides, the frequency

Abstract This article considers the use of structural analysis and synthesis of engineering and technological solutions in the conceptual design phase. The relationship between the problems of structural synthesis and parametric optimization and the change in the information field as the project develops are considered. As an example, a solution is shown for finishing oddly shaped parts.

Abstract The calculation of errors of the main elements of algorithms in the operation of a strapdown inertial navigation system on moving objects is undertaken. Four coordinate systems have been treated, in which the necessary equations for the projections of vectors on the axis of coordinate systems have been obtained for their further use in the construction of system algorithms. The transition