Journal of Machinery Manufacture and Reliability
Journal Prestige (SJR): 0.238 Number of Followers: 2 Hybrid journal (It can contain Open Access articles) ISSN (Print) 1934-9394 - ISSN (Online) 1052-6188 Published by Springer-Verlag [2468 journals] |
- Design and Technological Solutions for Additive Manufacturing of Parts in
the Volume of Material-
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Abstract: The features of technical solutions for additive manufacturing of parts are discussed. In contrast to existing solutions for layer-by-layer synthesis, a new method and device is proposed for the movement of a working tool in the volume of a powder. Various implementation options are considered using morphological analysis by constructing a morphological table. This ensures the validity of the proposed technical and technological solutions and, therefore, will improve the technical level and efficiency of the synthesized systems. An analysis has been made of solutions that provide less expensive production of three-dimensional objects due to better process control, which leads to higher productivity and reduced cost of both the technological process and the equipment. It also becomes possible to create more compact, lighter, and cheaper equipment for the synthesis of three-dimensional objects. The proposed technical solutions expand the functionality of the equipment by implementing both layer-by-layer (horizontal) synthesis and volumetric, vertical or mixed horizontal–vertical, synthesis of parts.
PubDate: 2024-08-01
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- Development of a Sealing Cup Selection Procedure for YAMZ Transmission
Flange Sealing during Repair-
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Abstract: The sealing cup selection procedure for shaft surfaces during repairs is substantiated theoretically and tested practically. The procedure consists of justifying the diameters of the repair dimensions of the shafts based on wear data and selecting sealing cups for these dimensions according to the internal diameter in order to ensure the same tightness as for new connections. The practical application of the procedure is considered on a transmission output shaft connection.
PubDate: 2024-08-01
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- Modification of the Gough–Stewart Platform with Six Degrees of
Freedom-
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Abstract: The Gough–Stewart platform has occupied an important place in the manufacturing and scientific industries, making it possible to facilitate various production cycles or conduct necessary research. Its development makes it possible to solve newer and more complex problems or facilitate the implementation of existing ones. This article considers a modification of the classical platform; considers solutions to direct and inverse kinematics problems; implements a visualization program and a control algorithm, both a physical model of the platform and a virtual one; and estimates the parameters of the platform. Direct and inverse kinematics problems are one of the main problems that describe the platform; on their basis, it is possible to consider the behavior of the platform in various configurations of the given parameters. The visualization program allows one not only to view the behavior of the platform without the need to use a physical model of the platform, but also to control the real platform by transmitting the appropriate signals to the control circuit.
PubDate: 2024-08-01
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- A Pressure Oscillation Steam–Water Generator
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Abstract: The results of an experimental study of a steam jet injector in the mode of generating nonlinear pressure oscillations of a relaxation nature are presented. High-frequency decaying pressure jumps were detected on the leading edge of the oscillation curve. It is shown that, when exciting oscillations, the injector operating mode changes from supersonic to subsonic. An explanation of the pressure oscillation process during the cycle is given. With a working steam pressure of 8–10 bar, an oscillation amplitude of 5–6 bar at frequencies of 5–20 Hz was obtained.
PubDate: 2024-08-01
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- Reverse Engineering in Production and the Repair Complex Profile and
Large-Sized Products-
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Abstract: Methods have been developed for monitoring and diagnosing the degree of wear and loss of the geometric shape of surfaces. A selection of technological routes was carried out for the complex restoration of working surfaces of large-sized products using electrophysical energy sources during surfacing of powders and wires. It has been shown that the cost of major repairs when restoring a screw shaft is, on average, two times lower than manufacturing a new one. It is important to monitor regularly the degree of wear of shaft turns and their local restoration using surfacing materials and technologies.
PubDate: 2024-08-01
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- Phase Composition of Titanium Powders Obtained for Additive Machines by
Electrodispersion of OT4 Alloy Waste in Alcohol-
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Abstract: On the basis of experimental studies aimed at studying the phase composition of titanium powders obtained for additive machines by electrodispersion of OT4 alloy waste in propyl alcohol, the presence of the following phases in titanium powder particles was noted: α-Ti, TiO, and Ti3Al. The studies carried out will make it possible to determine the most rational field of application of the obtained titanium powders for the production of additive products from them.
PubDate: 2024-08-01
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- Selection of a Base Vegetable Oil for the Development of a Biodegradable
Lubricant Using the TOPSIS Method-
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Abstract: Vegetable oils and animal fats are considered as base materials for the development of biodegradable lubricants. Classification of such materials was carried out using the Ward method based on the Euclidean distance, followed by refinement by the k-means method based on the physico–chemical properties. The selection of a material with the optimal characteristics was carried out using the TOPSIS method. Based on the calculated coefficients of relative closeness to an “ideal” material, a rating of lubricants was built, among which rapeseed oil is of the greatest interest. The comparative tribological characteristics of vegetable oils with the best ratings are presented. It is shown that vegetable oils are not inferior to mineral and synthetic oils. The ranking results can be used in further fundamental and applied research on the development of biodegradable lubricants.
PubDate: 2024-08-01
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- Analysis and Synthesis of Deployable Parabolic Antennas with Axisymmetric
Petal Packaging and Spherical Deployment Mechanisms with Conical Gear
Pairs-
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Abstract: The problem of automation intended for the analysis and synthesis of deployable parabolic antennas is considered. The interrelated variable parameters of the mating elements of a deployable parabolic reflector of an antenna with an axisymmetric packaging of the petals and spherical mechanisms for their deployment in the form of conical gear pairs have been chosen and studied. A comparative analysis of the variants of petal deployment mechanisms with constant and variable gear ratios has been conducted.
PubDate: 2024-08-01
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- Integrated Study of Al-MMC Reinforced with SiC and TiO2: Advancements in
Mechanical Properties, SEM Analysis, and Structural Suitability for Wind
Turbine Applications-
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Abstract: In this study, aluminum-based metal matrix composites (MMCs) were fabricated with varying compositions of SiC and TiO2 reinforcements using the stir casting method. Three different compositions were examined: 98% Al6061 alloy, 1% SiC, and 1% TiO2; 96% Al 6061 alloy, 2% SiC, and 2% TiO2; and 94% Al alloy, 3% SiC, and 3% TiO2. These MMCs were evaluated for their mechanical behavior and microstructure in terms of tensile, flexural, and impact strength. Scanning electron microscopy (SEM) analysis revealed a uniform distribution of reinforcements, while also indicating an uneven dispersion of SiC particles within the Al matrix. Tensile testing displayed an ultimate strength of 160.06 MPa, an elongation of 6.63%, and a hardness of 96.5 for the sample with the composition of 94% Al, 3% SiC, and 3% TiO2. For the composition of 96% Al alloy, 2% SiC, and 2% TiO2, the highest flexural strength of 6.57 kN, notable impact strength of 6 J, and a hardness value of 93.68 were achieved. Atomic force microscopy (AFM) was employed to analyze surface morphology. These results demonstrate the potential of these MMCs for practical applications due to their improved properties compared to commercially available composites. The study highlights the tailored mechanical attributes of metal matrix composites, showcasing their strength, stiffness, fatigue resistance, and corrosion resistance. Such systematic analyses aid in the development of more efficient and dependable structures for wind turbine applications.
PubDate: 2024-08-01
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- Study of the Dynamics of Processing Parameters When Turning an
Aluminomatrix Cast Composite Workblank-
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Abstract: A solution to the problem of determining the components of the cutting force and the cutting temperature when turning an aluminum matrix cast composite material is presented. The components of the cutting force and the cutting temperature when processing an aluminum matrix cast composite material with a hard alloy were taken as the optimization parameters. The studies were carried out using a specially designed experimental setup that consists of a lathe and a bench for recording, monitoring, and analyzing dynamic processes in the form of a signal from the cutter during turning. The computer and mathematical processing of the results obtained was carried out using the least squares method, which made it possible to derive the calculation equations to determine the factors under study. The optimal values of the factors corresponding to the optimal cutting force components and the corresponding cutting temperatures are determined.
PubDate: 2024-08-01
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- Mathematical Modeling of the Aeroelastic Response of a Disk Having a
Nonlinear Elastic Suspension and Interacting with a Layer of Viscous Gas-
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Abstract: In this paper, a mathematical model of nonlinear aeroelastic oscillations of a disk that has a suspension with hardening cubic nonlinearity and interacts with a layer of viscous gas pulsating due to a specified disturbance on its contour is presented. An asymptotic analysis, which made it possible to reduce the initial model to the generalized Duffing equation, based on the solution of which the main aeroelastic response of the disk and its phase shift were found using the harmonic balance method, was carried out. The characteristics in particular cases provide a transition to an incompressible viscous fluid and a linear elastic suspension, while their numerical study made it possible to establish that the compressibility of the gas leads to an increase in the values of the resonant frequencies and an increase in the amplitudes of the disk oscillations. Calculations showed the possibility of suppressing unstable oscillations of the disk near resonant frequencies by changing the thickness of the gas layer. The obtained results can be used to study the dynamics of gas and liquid dampers and supports, as well as sensitive elastic elements of pressure sensors.
PubDate: 2024-08-01
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- Influence of Compression Ratio on Pressure in the Cylinder of Internal
Combustion Engine-
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Abstract: Currently, variable compression ratio engines are not used, presumably due to the complexity of the design. Currently, various engines are being developed that differ in design, kinematics, load control and compression ratio changes. The article presents the results of calculating the efficiency and fuel consumption for a crankshaft with a rotation speed of 2000 and 4000 rpm with a compression ratio of 8.6 and a rotation speed of 4000 rpm with a compression ratio of 13 and provides combustion characteristics m = 3 and 1. It is shown that these characteristics at higher speeds they approach the indicators at lower speeds with an increase in the compression ratio. The engine parameters were calculated for various modes based on Wiebe theory. Based on the calculations, the efficiency and fuel consumption are determined for the corresponding modes and the nature of the engine operation. It has been found that with an increase in the crankshaft rotation speed, the cycle efficiency will decrease by almost half and fuel consumption will increase accordingly; with an increase in the compression ratio, the efficiency is restored and fuel consumption decreases accordingly.
PubDate: 2024-08-01
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- Features of Finite Element Simulation of Laser Impact Welding of Aluminum
with Stainless Steel-
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Abstract: The technology of laser impact welding of a thin aluminum plate with a stainless steel plate is discussed. Finite element simulation of the laser impact welding technology was conducted using the ABAQUS package. The results showed that the quality of the weld mainly depends on two parameters: the energy of the laser pulse and the initial distance between the plates. Conditions were established under which parameters of laser impact welding can be used to weld an aluminum plate with a stainless steel plate. The distributions of plastic strains and temperatures along the weld were obtained.
PubDate: 2024-08-01
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- Stability of a Distributed Automated Control System Taken into Account in
a Model for Predicting the Consequences of Unintentional Destructive
Impacts-
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Abstract: The tasks of forecasting a possible scenario of unintentional destructive impacts (mass impacts like voltage fluctuations, industrial electromagnetic interference, natural impacts) on a distributed automated control system are discussed. Analytical relationships are proposed to assess the consequences of such destructive impacts (signal transmission systems, communication systems). One of the possible scenarios of such impacts on the system is considered, taking into account the distribution of the intensity.
PubDate: 2024-08-01
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- Features of Changes in the Physical and Mechanical Properties of the
Wearing Pad–Base Metal System by the Example of a Lemken Plough Share
Blade-
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Abstract: Materials on the symmetrical influence of thermal fields on the side opposite to a hard-surfaced side, expressed in the same form of hardness distribution diagrams, are presented. The introduction of conditional criteria for assessing the properties of the thermally affected zone makes it possible to assess its stress state indirectly. The numerical values of the hardness of individual sections of the hardened sample are obtained.
PubDate: 2024-08-01
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- Erratum to: Role of the Pulse Current Duty Cycle during Titanium Tension
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Abstract: An Erratum to this paper has been published: https://doi.org/10.1134/S1052618824700146
PubDate: 2024-06-01
DOI: 10.1134/S1052618824700146
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- Physical and Mechanical Properties of Electrospark Coatings Applied by
Electrospark Treatment with a Composite Electrode-
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Abstract: Electric spark machining allows coated parts to be coated with any electrically conductive materials, ensuring good adhesion to the base material, thereby restoring worn surfaces. However, limitations on the thickness of the applied coating significantly affect its distribution when restoring parts with wear of more than 0.2 mm. One way to solve this problem when restoring parts with increased wear is electric spark processing using composite electrodes with carbon nanotubes. Thanks to the use of a composite electrode with carbon nanotubes, it was possible to increase the thickness of the coating by 2–4 times, which will expand the range of the restored parts. At the same time, the microhardness of the coatings decreased when carbon nanotubes were added to the electrode, but under certain conditions it was possible to achieve a microhardness value comparable to coatings from BrO10S10 electrodes.
PubDate: 2024-06-01
DOI: 10.1134/S1052618824700122
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- Study of the Main Factors Affecting the Increase in the Friction
Coefficient of Interacting Surfaces of Rail Vehicles-
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Abstract: As a result of theoretical studies, it was established that the coefficient of friction of the interacting surfaces of rail vehicles is significantly influenced by the roughness of the contacting surfaces, the actual contact area, the temperature in the contact zone of the wheel-rail system, and the speed of mutual sliding (slip) of the contacting surfaces. It has been established that, in order to ensure the strength criterion and reduce wear, it is necessary to limit the temperature in the contact zone of the wheel–rail system within 300°С by controlling the sliding speed of the wheel relative to the rail. It has been revealed that the effective functioning of the wheel–rail system can be realized through the interaction of the machined working surfaces of the wheel and rail with roughness Rz 20–40 µm. Implementation of the proposed technical solutions using tribological research methods will allow for the possibility of increasing the friction coefficient of wheel–rail systems by up to 27%.
PubDate: 2024-06-01
DOI: 10.1134/S1052618824700055
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- Ballistics of Elongated Man-Made Elements
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Abstract: During engineering blasting operations, various man-made elements (particles) can be formed from the structure due to the impact of an explosion, which, as experimental data show, can have a completely arbitrary shape and a fairly large mass and speed. This article is devoted to consideration of the ballistics of elongated elements and the derivation of the calculated dependencies that allow one to estimate the trajectory of their movement.
PubDate: 2024-06-01
DOI: 10.1134/S1052618824700067
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- Method of Calculating the Operational Reliability of Standard Process
Systems-
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Abstract: This study considers the application of standard operation array designs of cementing equipment using various numbers of pumping and mixing facilities for ensuring uninterrupted implementation of the cementing process. A design operational reliability model of various standard piping layouts is developed. Several piping layout types are considered individually. According to the outfit-mouth function chart, a ready-mix mud is pumped by the facility right into the well.
PubDate: 2024-06-01
DOI: 10.1134/S1052618824700079
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