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Antifriction Properties of a Diamond-Like Coating and Titanium Nitride in Model Lubricating Media J. Mach. Manuf. Reliab. Pub Date : 2020-10-20 I. A. Buyanovskii, V. D. Samusenko, V. A. Levchenko
Abstract Antifriction properties have been studied for a diamond-like coating (DLC) and titanium nitride, used as an intermediate layer to improve adhesion. The physical and mechanical properties of the coatings have been determined, and the tribotechnical properties thereof have been evaluated in an inactive lubricating medium, as well as in lubricating media with surfactant and chemically-active
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Tribotechnical Characteristics of Nanomodifier 1 J. Mach. Manuf. Reliab. Pub Date : 2020-10-20 A. Yu. Albagachiev, N. N. Novikova, A. B. Tokhmetova
Abstract The results of studies on the friction coefficient in steel, bronze, and cast iron friction pairs under the conditions of lubrication are presented. Comparative testing of the tribotechnical properties of motor oil without and with the addition of a specialized additive using a UMT-1 universal friction machine has been performed. The analysis of the results has demonstrated a narrow efficiency
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The Modeling Burden and Resource of an Automatic Coupler Body by Techniques of Numerical Analysis J. Mach. Manuf. Reliab. Pub Date : 2020-10-20 E. S. Oganyan, V. S. Kossov, M. N. Ovechnikov, G. M. Volokhov, A. S. Gasyuk
Abstract This article describes an approach to evaluating the resource of automatic coupler bodies against the criteria of the metalwork strain damage rate. The results of this study are used to analyze the resource life of an automatic coupler body, including determination of its safe operation life.
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The Dynamic Reliability Model under Variable Loads and Accelerated Tests J. Mach. Manuf. Reliab. Pub Date : 2020-10-20 V. A. Prourzin
Abstract In this paper, we propose a new formulation of the physical reliability principle and build a reliability model in the form of a system of differential equations taking into account variable loads. A load is applied to the input of the dynamic system, and a probability function of failure-free operation is formed at its output. The conditions for the equivalence of dynamic models are studied
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Study of the Mechanics of Spatial Elastoplastic Strain and Fracture of Weld Joints of Austenite Steels J. Mach. Manuf. Reliab. Pub Date : 2020-10-20 N. A. Makhutov, I. V. Makarenko, L. V. Makarenko
Abstract The results of calculated–experimental and numerical studies of the relative strain intensity factors in the case of semi-elliptical inclined surface cracks in the weld joints of 12Kh18N10T austenite stainless steels with the assumption of redistribution of strain and initial residual stresses under nonlinear boundary loading conditions are presented. A parametric equation for the determination
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Calculation of the Vibration Parameters of Steam-Generator Tube Systems to Validate the Vibration Strength and Lifetime J. Mach. Manuf. Reliab. Pub Date : 2020-10-20 T. N. Fesenko, S. A. Koretskii, L. I. Shitova
Abstract A mathematical model of the vibrations of an elastic tube bundle in a crossflow is considered. The model is applicable to predict the reaction of the tube bundle components under the action of the vortex and hydroelastic excitation mechanisms considering the intermediate supports placed with gaps between them and the tube components—the presence of the gaps is a necessary precondition for
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The Nature of Fractal Relief of Fractured Metal Samples after Dynamic Loading J. Mach. Manuf. Reliab. Pub Date : 2020-10-20 G. G. Savenkov, V. V. Stolyarov, A. V. Kuznetsov, Yu. I. Meshcheryakov
Abstract— Experimental and theoretical results demonstrating that the fractal nature of a surface periphery destroyed under the impact of dynamic loading can be attributed to velocity dispersion of particles (elementary deformation carriers) at various scale and structure levels of deformation and fracture are presented.
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Statistical Dynamics and Reliability of Mechanical Systems with Kinematic, Power, and Parametric Impacts J. Mach. Manuf. Reliab. Pub Date : 2020-10-20 A. S. Gusev, L. V. Zinchenko, S. A. Starodubtseva
Abstract In this paper, we consider the computational prediction problem of the reliability of mechanical systems that are in operation under irregular loads, which is relevant for modern mechanical engineering. The calculation problems include determining the functioning reliability of such systems as the probability that the parameters (linear and angular displacements, accelerations of the mass
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Evaluation of Thermal and Acoustic Energy during Collapse of Cavitation Bubbles J. Mach. Manuf. Reliab. Pub Date : 2020-10-20 A. A. Aganin, O. R. Ganiev, A. I. Davletshin, L. E. Ukrainskii
Abstract The results of a numerical study of the thermal and acoustic energies released during the collapse of a single spherical cavitation bubble in water at a pressure of 10 bar and a temperature of 20°С are given. In the model used, we take into account the thermal conductivity of the vapor in the bubble and the surrounding liquid, heat transfer, evaporation/condensation on the surface of the bubble
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Searching Method for Suboptimal Action Ensuring Acceptable Losses in the Process Quality J. Mach. Manuf. Reliab. Pub Date : 2020-10-20 D. S. Solovjev, I. A. Solovjeva, Yu. V. Litovka, V. A. Nesterov
Abstract The application of the obtained control of multidimensional objects can be suboptimal under conditions of input coordinate uncertainty and can entail unacceptable process quality losses. To solve this problem, a suboptimal control searching method is proposed, which consists in building a control matrix from the input coordinate values, control actions, and control criteria, the distance between
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Estimating Stress Concentration near Grips by the Tension of Polymer Composite Samples J. Mach. Manuf. Reliab. Pub Date : 2020-10-20 A. N. Polilov, N. A. Tatus’
Abstract This work aims at the problem of justification of the tensile strength test of flat glass- and carbon-fiber-reinforced plastic samples. Any technique of sample holding causes a concentration of stress and influences negatively on the strength; quantitative estimates of this effect are presented in this work. Based on a simplified equation of shear analysis, the stress distributions in the
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Parallel Mechanisms with Group Kinematic Decoupling Ensured by Multiloop Power Transmission in Kinematic Chains J. Mach. Manuf. Reliab. Pub Date : 2020-10-20 K. B. Salamandra, L. I. Tyves, V. A. Glazunov, E. S. Gebel
Abstract Parallel manipulation mechanisms are multiloop systems in which the parallel arrangement of the kinematic chains allows for the load capacity to be increased, the size and weight of every component to be reduced, and the movable links to be relieved of the gravity force of the actuators by locating them on a fixed base. In this article, the synthesis of a new parallel mechanism with an increased
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Forced Oscillations of a Finite Cylindrical Shell Excited by Discrete Forces J. Mach. Manuf. Reliab. Pub Date : 2020-10-20 O. I. Kosarev
Abstract In this paper, we propose a numerical-analytical method for calculating forced oscillations of a shell structure composed of a set of finite elastic cylindrical shells and elastic rings, to which discrete disturbing forces are applied. Examples of calculating the amplitude–frequency characteristics and vibration modes of the shell structure are given.
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A Technique for Configuring the Relative Program Movements of Robotic Systems with Two Arms J. Mach. Manuf. Reliab. Pub Date : 2020-09-10 E. I. Vorob’ev
Abstract This article proposes a technique for coordinating the movements of operating links of two-armed robotic systems with six degrees of freedom. The technique is based on introducing relative positioning matrices for the output links of the mechanical arms and solving reverse problems of the relative manipulator positioning. Manipulators with three degrees of freedom are viewed as mechanical
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Improving Liquid Filtration through Porous Media by Wave Exposure J. Mach. Manuf. Reliab. Pub Date : 2020-09-10 A. S. Korneev, S. R. Ganiev
Abstract This paper presents an experimental study of water filtering through a porous medium exposed to waves generated by a hydrodynamic oscillator. The amplitude–frequency characteristics of the oscillator are obtained for various water flow rates through this oscillator. The optimum flow rate at which the filtration rate is the highest was obtained. These results can be used in the design of hydrodynamic
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Forecasting the Accuracy Parameters of Automated Technological Pipe Flexure for Gas-Turbine Engines with a Complex Spatial Shape J. Mach. Manuf. Reliab. Pub Date : 2020-09-10 I. A. Burlakov, G. A. Mangasaryan, Yu. A. Gladkov, A. A. Kukuyuk, D. E. Gordin
Abstract We present the results of experimental and computational study of the process of flexure of pipes with complex spatial shapes on a pipe-bending machine using the QForm VX program based on the finite element method. The possibility of predicting the accuracy parameters of the semi-finished product and possible defects by the method of process simulation is shown.
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Enhancement of Material Crack Resistance Using Laser Shock Processing J. Mach. Manuf. Reliab. Pub Date : 2020-09-10 G. Zh. Sakhvadze
Abstract In this paper, we develop a numerical model that allows predicting the effect of laser shock processing of materials on the occurrence of new cracks, as well as on the propagation pattern of existing cracks. Linear cracks and so-called V-shaped cracks are studied. The fields of residual stresses arising during laser shock processing are determined. The optimal modes of laser shock processing
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Experimental Studies of the Dynamics of a Mobile Robot with a Vertical Movement Mechanism on Magnetic Caterpillar Movers J. Mach. Manuf. Reliab. Pub Date : 2020-09-10 V. V. Serebrennyi, D. V. Lapin, A. A. Mokaeva
Abstract In this paper, we discuss the dynamics of a newly developed mobile robot with a vertical movement mechanism on magnetic caterpillar movers. Based on analysis of the current solutions in the field of vertical movement robots, an original kinematic scheme of the movement of the vertical movement mechanism that allows implementing a number of critical advantages compared to current schemes was
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Mathematical Models Drives of Stands of Bridges of Tube-Reducing Machines J. Mach. Manuf. Reliab. Pub Date : 2020-09-10 L. A. Chumakova
Abstract We consider computation and selection problems in reduced models for the study of the dynamical load of the stand of the bridge of a tube-reducing machine. We design and analyze the computational scheme and obtain a system of differential equations for investigation of the dynamic processes in the drive. We provide the order of the computation of the dynamic loading, present relations for
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Studying Self-Braking Planetary Gears with Single-Crown Satellites J. Mach. Manuf. Reliab. Pub Date : 2020-09-10 G. A. Timofeev, V. V. Panyukhin, D. V. Sashchenko
Abstract The results of studying self-braking planetary gears with single-crown satellites, as well as central and ring gears with extra-pole engagement, are outlined. The conditions of self-braking of these planetary gears are determined using the method developed for studying self-braking. The domains of existence of self-braking gearings with the highest performance are found.
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Automation of Analysis of the Structure of a Material with Details Based on Controlled Functional Systems J. Mach. Manuf. Reliab. Pub Date : 2020-09-10 V. F. Bezyazychnyi, I. N. Palamar’, N. S. Azikov
Abstract— An approach to solving the problem of image analysis of complexly formalized materials structures of critical parts is considered. Methodological foundations for the automation of the study of the structure of a material, which provides an assessment of the specified operational properties of parts based on the controlled creation of functional systems, are proposed. Methods to estimate the
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Vibrotransporting of Bodies on a Surface with Non-Translational Rotational Oscillations J. Mach. Manuf. Reliab. Pub Date : 2020-09-10 I. I. Blekhman, V. B. Vasil’kov, Yu. A. Semenov
Abstract In this article we study the theoretical problem of vibrational transportation of bodies along a surface in the state of non-translational, in particular, rotational oscillations. Nonlinear differential equations of motion of bodies on such surface are obtained. It is shown that, in the case where the influence of centrifugal and Coriolis inertia forces can be neglected, when finding the local
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Experimental Observation of Vertical Flexible Shaft Generation Roll over a Rigid Stator J. Mach. Manuf. Reliab. Pub Date : 2020-09-10 A. N. Nikiforov, A. E. Shokhin, O. V. Barmina
Abstract The frequency responses of four experimental shafts in a generation roll over a comparatively stiff stator are presented. The initial conditions of existence and stability of the generation roll in the isotropic rotor–stator system are empirically determined. These conditions are reduced to rotation with a rotation speed near the first eigenfrequency on bearings and to friction with a sliding
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Hydrodynamic Model of a Wedge-Shaped Sliding Support with an Easy-Melting Metal Coating J. Mach. Manuf. Reliab. Pub Date : 2020-09-10 M. A. Mukutadze, D. U. Khasyanova, A. M. Mukutadze
Abstract This study presents the method of forming an exact self-similar solution to the problem of hydrodynamic computation of a wedge-shaped support (slider, guide), which operates in the presence of a lubricant, a fusible metal coating on the surface of the guide, and a porous material on the surface of the slider taking the dependence of the viscosity of the lubricant and the permeability of porous
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Integrated Assessment of the Durability, Resources, Survivability, and Safety of Machinery Loaded under Complex Conditions J. Mach. Manuf. Reliab. Pub Date : 2020-09-10 N. A. Makhutov, M. M. Gadenin
Abstract— It is shown that a multiparameter system of strength, resource, survivability, and safety assessment applies to measuring parameters such as the static, dynamic, and cyclical strength, cracking resistance, cold resistance, and corrosion resistance. The laws of straining and fracture are used, and the general statement and solutions of basic and applied strength, resource, survivability, and
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FEM Vector Approximation for a Shell of Revolution with Account for Shear Deformations J. Mach. Manuf. Reliab. Pub Date : 2020-09-10 Yu. V. Klochkov, A. P. Nikolaev, T. R. Ishchanov, A. S. Andreev
Abstract An algorithm implementing the vector approximation of values for the stiffness matrix of a finite element in the curvilinear coordinate system for a shell of revolution is presented. The algorithm is based on the Timoshenko hypothesis about the inclination of the normal to the middle surface of the shell.
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Experience in Applying the Structural Technique for Reliability Evaluation of a Gamma-Therapy Set J. Mach. Manuf. Reliab. Pub Date : 2020-09-10 A. A. Vasil’yev, A. A. Ravin, O. V. Khrutskii, A. V. Baturin, V. N. Shevchenko
Abstract— This paper considers our experience in applying the structural technique to evaluating the reliability of a therapeutic robotic set designed for guided radiation exposure of malignant tumors in patients. The features of the structural decomposition of the electromechanical systems of the gamma unit and treatment table are distinguished. The results of applying the Relex software set in drawing
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Safety Devices Based on Smart Alloys J. Mach. Manuf. Reliab. Pub Date : 2020-06-26 N. N. Popov; D. V. Presnyakov; V. F. Lar’kin
Abstract—A device based on smart alloys has been designed for use in machine building items, in particular, in nuclear engineering, for preventing anthropogenic and natural emergencies. The device breaks the electric circuit by cutting the electric wire bundle in case of an emergency increase in temperature above the permissible limit.
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Experimental Analysis of the Kinematics of Motion of Floating Elements in Rotor Mechanisms J. Mach. Manuf. Reliab. Pub Date : 2020-06-26 L. Ya. Banakh; L. I. Tyves
AbstractThe kinematics of the motion of floating elements (ring) of rotor mechanisms under steady state rotation modes is examined experimentally. The ring is placed with a gap with respect to the drive cylindrical link and touches it without losing contact. It is shown that the ring motion is a direct asynchronous precession and its points circumscribe epitrochoids, if the driving motion is “lunar
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Mathematical Modeling of Gas Effusion into a Vacuum J. Mach. Manuf. Reliab. Pub Date : 2020-06-26 V. A. Kotelnikov; M. V. Kotelnikov; G. S. Filippov; M. A. Platonov
AbstractThe effusion of gas through a small rectangular opening into a vacuum is studied using methods of mathematical modeling. The distribution functions of gas particles flowing out of an opening and the moments of these functions, i.e., fields of gas particle concentrations and velocities, are obtained. The dependence of effusion on the volume from which the gas escapes is investigated.
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Analysis and Synthesis of Dynamic Characteristics of Machine-Tool Equipment Based on Rotary Linear Modules J. Mach. Manuf. Reliab. Pub Date : 2020-06-26 V. L. Afonin; A. N. Smolentsev; L. V. Gavrilina
AbstractThe use of mechatronic rotary linear modules in manipulators of machine-tool equipment is considered. A solution to the inverse position problem is presented, and the kinematic capabilities of a device based on mechatronic rotary linear modules for machine-tool equipment are evaluated. Dynamic equations have been derived used to evaluate the dynamic characteristics and the precision of the
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Calculation of Vibroshock Processes with Repeated Collisions (Bouncing) J. Mach. Manuf. Reliab. Pub Date : 2020-06-26 V. L. Krupenin
AbstractIn this paper, we consider the problem of calculating the parameters of damped oscillations under the collision of two systems with one degree of freedom. Such oscillations can be accompanied by vibroshock processes with repeated collisions (modes with bounce). The nature of these processes depends on the accepted models of energy dissipation and the design features of the colliding objects
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Probabilistic Analysis of the Reliability and Fatigue Life of Machine Parts by Fatigue Failure J. Mach. Manuf. Reliab. Pub Date : 2020-06-26 Zh. B. Bakirov; A. A. Tanirbergenova
AbstractThe problem of calculating the reliability and fatigue life of machine parts by the fatigue failure under random changes in the actual and limit stresses is considered. According to the corrected theory of the linear summation of damage, a transcendental equation has been obtained that relates the number of cycles until failure to the random loading parameters and the ultimate strength. From
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Stress Concentration and Shape Optimization for a Fillet Surface of a Step-Shaped Shaft J. Mach. Manuf. Reliab. Pub Date : 2020-06-26 M. N. Erokhin; P. V. Dorodov; A. S. Dorokhov
AbstractAn analytical solution to the direct boundary-value problem and the two-dimensional problem concerning the stressed condition in the median surface of a step-shaped shaft is presented. In the boundary-value problem, a singular integral equation with the Cauchy kernel is used, the solution of which can be found in the form of an unlimited increase in stresses at the ends of the integration interval
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Theoretical Investigation of the Influence of Combined Machining Modes on the Value and Character of Residual Stresses in the Surface Layer of Cylindrical Friction Pairs J. Mach. Manuf. Reliab. Pub Date : 2020-06-26 A. P. Yakovleva; A. Yu. Albagachiev
AbstractIn this paper, analysis of influence of residual stresses in the surface layer of cylindrical friction pairs on the operational wear resistance index is carried out. Stresses of the first kind after application of combined machining are investigated. Combined machining is consecutive electromechanical machining and diamond burnishing. A formula for calculation of residual stresses originating
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Theoretical Fundamentals of the Discrete Operational Lifetime J. Mach. Manuf. Reliab. Pub Date : 2020-06-26 G. S. Sadykhov; S. S. Kudryavtseva
AbstractThe reliability of complex engineering objects is affected not only by the duration of the failure-free service (the continuous lifetime) but also the number of no-failure actuations to switch on the object into operation or switch it off (the discrete lifetime). The aim of this work is to fill this gap in part.
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Modeling the Motion of a Saw Ginning Machine J. Mach. Manuf. Reliab. Pub Date : 2020-06-26 D. M. Mukhammadiev; F. Kh. Ibragimov; T. D. Mukhammadiev
AbstractThe dynamic characteristics of a saw gin as a subsystem with lumped and distributed parameters are considered in the paper. On the basis of investigation of the machine assembly, graphs are drawn that allow establishing the maximum values of the angle of relative rotation and the angle of rotation of the saw cylinder shaft under torsion.
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Effect of the Structural Material Strength of a Case of Solid Propellant Charges on the Performance of a Pulsating Explosive Device J. Mach. Manuf. Reliab. Pub Date : 2020-06-26 V. O. Solov’ev; G. V. Moskvitin; N. M. Ovchinnikov; M. S. Kel’ner; M. S. Pugachev
AbstractIn this paper, the results of full-scale experimental studies on the effect of the structural material strength of thin-walled cases of concentrated explosive charges on the performance of pulsating explosive devices for various purposes are analyzed.
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Analysis of Efficiency of Fiberglass Ring and Band Springs J. Mach. Manuf. Reliab. Pub Date : 2020-06-26 A. N. Polilov; N. A. Tatus’; V. V. Zhavyrkin; X. Tian
Abstract—A method of design analysis of a magazine ring and wave band springs of unidirectional, high strength, and low modulus fiberglass is represented. The springs are intended as a spring suspension for vehicles and aircraft. The use of split rings with different gaps makes it possible to obtain a nonlinear change in the compliance of suspension. The effects of the creation of equal strength profiling
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Characteristics of Development of Fatigue Cracks in Steel under Low-Level Operation Loading J. Mach. Manuf. Reliab. Pub Date : 2020-04-26 S. G. Lebedinskii; G. V. Moskvitin; M. S. Pugachev; A. N. Polyakov
AbstractAn assessment method for characteristics of low-rate development of fatigue cracks under operational loading is proposed. The method is based on the decrease in the irregular loading level by conservation of its conformity during crack growth. The control factor of the loading decrease is the intrinsic increase in the compliance of a sample during crack growth by its fixed opening. The experimental
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Overview of Local Rod Defect Detection Studies J. Mach. Manuf. Reliab. Pub Date : 2020-04-26 A. M. Akhtyamov; M. A. Il’gamov
AbstractThis article gives a review of three approaches to solving the problems of detecting local rod and pipeline defects and related problems. In the first approach, local defects are modeled by the matching conditions; in the second approach, by delta functions entering into the differential equation; and in the third approach, longitudinal cavities and cracks are modeled by continuous rod sections
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The Damping Effect on Critical Values of Nonconservative Loads J. Mach. Manuf. Reliab. Pub Date : 2020-04-26 V. P. Radin; V. P. Chirkov; O. V. Novikova; A. V. Shchugorev; V. N. Shchugorev
AbstractA systematic study of the effect of energy dissipation on critical nonconservative loads within the stability calculation is carried out. Some classical nonconservative elastic stability problems are considered: the stability of a linear form of equilibrium of a double pendulum under the action of a follower force, the stability of a cantilever beam compressed by a follower force (Beck’s problem)
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Forced Vibrations of a Cylindrical Shell Immersed in Liquid J. Mach. Manuf. Reliab. Pub Date : 2020-04-26 O. I. Kosarev; A. K. Puzakina; D. F. Nahatakyan
AbstractA numerical-analytical method is proposed for calculating the forced vibrations of a shell structure immersed in liquid. The structure is a set of finite elastic cylindrical shells and elastic rings to which concentrated discrete forces are applied. Examples of a comparative calculation of the frequency response and vibration modes of the shell structure in a vacuum and in liquid are given
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Calculating Mixed Forced and Self-Oscillations for Delayed Elastic Constraint and a Limited Power Energy Source J. Mach. Manuf. Reliab. Pub Date : 2020-04-26 A. A. Alifov
AbstractA frictional self-oscillating system with an elastic force delay and external influence is considered while interacting with an energy source of limited power. The procedure for using direct linearization methods to calculate mixed forced oscillations and self-oscillations in a system with delay and limited excitation is described. Based on this procedure, equations of nonstationary and stationary
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Analysis of Acoustic Signals for Diagnostics of Composite Materials J. Mach. Manuf. Reliab. Pub Date : 2020-04-26 R. S. Akhmetkhanov; E. F. Dubinin
AbstractThis article presents a method for the analysis of diagnostic acoustic signals for defect detection in composite materials. For this purpose, a multiple-scale decomposition of the acoustic signal and the determination of informational entropy for its components are used. It is established that, in the presence of small defects, the distribution of the power spectral density is little different
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Simulation of Technology for the Production of Axisymmetric Parts for Gas Turbine Engines Made of Heat Resistant Alloys by Means of Reeling under Superplastic Conditions J. Mach. Manuf. Reliab. Pub Date : 2020-04-26 R. Yu. Sukhorukov
AbstractShaping by means of reeling under the conditions of superplasticity using specialized reeling mills is a promising technology for manufacturing axisymmetric parts of gas turbine engines (disks and hollow shafts) based on heat-resistant alloys. Mathematical simulation is an efficient method for determining the energy and thermomechanical parameters of the technological process. This paper describes
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The Main Directions for Increasing the Tool Life of a Metal Cutting Tool with Modified Working Parts J. Mach. Manuf. Reliab. Pub Date : 2020-04-26 M. B. Brovkova; V. V. Martynov; E. S. Pleshakova
AbstractIn this paper, studies aimed to substantiate the directions of improving the reliability of a metal-cutting tool with working parts modified in terms of its service life by application of low-temperature plasma are presented. These investigations employed a database generated by the results of the pilot production operation of a modified hard-alloy tool and the mathematical software developed
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Estimation of the Reliability of the Gear–Motor System Using a Markov Model J. Mach. Manuf. Reliab. Pub Date : 2020-04-26 A. I. Abdullaev; I. G. Chalabi
AbstractIn this article, the reliability of a gear–motor system is analyzed on the condition that the failure of the gear leads under certain circumstances to the failure of the motor. The states of the system are modeled by a continuous-time Markov chain. The resulting system of differential equations is solved using the Laplace transform. In this way, the probabilities of the system’s states can
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Development of Inelastic Deformation upon Electromechanical Treatment and Surface Plastic Deformation of Grade 45 Steel J. Mach. Manuf. Reliab. Pub Date : 2020-04-26 N. G. Dudkina
AbstractThe effect of combined surface hardening such as electromechanical treatment and surface plastic deformation exerted on inelastic deformation processes occurring in grade 45 steel has been studied. The results of tensile tests and the analysis of the mechanical hysteresis loops for samples of grade 45 steel subjected to combined surface hardening are presented. The characteristic features of
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To Forecasting Residual Lifetime of Damaged Constructions under Shock Impacts in Operation J. Mach. Manuf. Reliab. Pub Date : 2020-04-26 V. A. Petushkov
AbstractA methodology for simulating mathematically the limit states of machines and structures subjected to quasi-static operational and shock impacts is generated by considering great (final) deformations and degradation of the properties of materials. The known experimental results and the modern mesomechanics conceptions on the structure, damage, and nonlinear processes of viscous-plastic faults
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Conditions for Operational Reliability and Tightness of Thermomechanical Joining Pipelines Using Couplers J. Mach. Manuf. Reliab. Pub Date : 2020-04-26 D. U. Khasyanova
AbstractA technique is presented for studying two batches of alloys based on Ti and Ni having the shape memory effect, with the help of which the deformation characteristics were obtained for samples of the alloy. Based on the results obtained, the use of alloys with different deformation characteristics for improving the reliability and tightness of pipeline junctions using alloy couplers with the
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Stabilization of a Rigid Rotor in Conical Magnetic Bearings J. Mach. Manuf. Reliab. Pub Date : 2020-03-16 E. E. Ovsyannikova; A. M. Gus’kov
AbstractThe controlled dynamics of the rotor of an axial pump arranged in conical active magnetic bearings is studied. Bearings of this type make it possible to miniaturize the geometry of the rotor suspension structure, which is an important factor when designing ann auxiliary mechanical blood circulation apparatus. In such facilities, the problem of rotor positioning plays an important role. The
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Liquid Heating During the Collapse of a Single Cavitation Bubble J. Mach. Manuf. Reliab. Pub Date : 2020-03-16 A. A. Aganin; O. R. Ganiev; A. I. Davletshin; L. E. Ukrainskyi
AbstractThis paper presents the results of a numerical study of the liquid heating process during collapse of a single spherical cavitation bubble in water at a liquid pressure of 10 bar, temperature of 20°C, and an initial bubble radius of 500 μm. The simulation of this phenomenon took into account the thermal conductivity of the vapor in the bubble and the surrounding liquid, heat transfer and e
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How to Use a Tensor Measure of Accumulated Fatigue Damage for Analyzing the Fatigue Life of Carbon Fibre-Reinforced Plastics under a Complex Stress State J. Mach. Manuf. Reliab. Pub Date : 2020-03-16 V. E. Strizhius
AbstractA phenomenological model describing fatigue damage accumulation by using a tensor measure of the accumulated damage caused by different cyclic stresses is presented for estimating numerically the fatigue life of carbon fibre-reinforced plastics operating under complex stress state conditions. A procedure for calculating the fatigue life by using the presented model is given. An example demonstrating
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The Effect of the Technological Heredity of the Stress–Strain State on the Accuracy of Nonrigid Parts J. Mach. Manuf. Reliab. Pub Date : 2020-03-16 G. V. Muratkin; V. A. Sarafanova
AbstractThe effect of the technological heredity of the stress–strain state on the accuracy and dimensional stability of nonrigid parts such as shafts is considered. The negative inheritable factors and patterns of inheritance of the stress–strain state of blanks are defined. An improved process of fabrication of nonrigid shafts is presented taking into account the technological heredity.
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Determination of the Minimum Number of Inspections Necessary for Establishing of the Barely Visible Impact Damage Size in Composite Aeronautical Structures J. Mach. Manuf. Reliab. Pub Date : 2020-03-16 S. V. Dubinskii; V. Ya. Senik; I. S. Sidorov; V. S. Dubinskii
AbstractThis article investigates the dependence between the method of statistical data processing and the necessary amount of experimental studies required for empirical determination with a given level of reliability of the impact surface dent visual detectability threshold in composite aeronautical structures. Two methods for determining the minimum detectable damage size are considered, one of
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Thermomechanical Processing of Titanium and Nickel Alloys J. Mach. Manuf. Reliab. Pub Date : 2020-03-16 G. N. Polyakova; U. Kh. Ugurchiev; N. N. Novikova
AbstractThis article considers aspects of thermomechanical processing at T > 400°C of Ti and Ni alloys with shape memory and the properties of materials with thermal elastic transformations, depending on the thermal and thermomechanical action as well as the aspects of thermal processing of metals with thermoelastic transformations. Technologies are proposed for applying thermal processing to alloy
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A Group Air Hydraulic Actuator of Power Stations for Form–Fill–Seal Automatic Packaging Lines J. Mach. Manuf. Reliab. Pub Date : 2020-03-16 B. L. Salamandra
AbstractThis article examines the aspects of power in-process operations along automatic lines for filling and packaging liquid and half-liquid products. It is shown that individual power station actuators can be replaced with one group air hydraulic actuator without any loss in productivity. Moreover, the dynamics of cutting out ready-made items can be significantly improved. The layout of an air
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Stabilization of the Design Loading Characteristics in the Problems of Durability Estimation of Tracked Vehicle Parts J. Mach. Manuf. Reliab. Pub Date : 2020-03-16 I. V. Gadolina; D. A. Dubin; I. M. Petrova; I. L. Serebriakova
AbstractFor a reasonable and reliable assessment of durability at the design or operation stage of the tracked vehicles, it is required information about the loading process. For a reliable assessment of loading and, consequently, durability, the question arises about the representative length of the loading process recording. The paper proposes a method for determining the necessary and sufficient
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Effect of Thermal Drilling Modes for Making Holes in Barely Deformable Materials Exerted on Tool Wear J. Mach. Manuf. Reliab. Pub Date : 2020-03-16 D. M. Zabelyan; I. A. Burlakov; D. E. Gordin; G. A. Mangasaryan; Yu. A. Gladkov
AbstractThis paper presents the results of experimental studies on the process of thermal drilling in workpieces made of barely deformed alloys by the example of the alloy HN62VMYuT-VD. A comparative analysis is presented, and the modes efficient from the standpoint of thermal drill wear and the process productivity are demonstrated. In addition, the revealed geometrical parameters and material of