Journal of Machinery Manufacture and Reliability最新文献

This article is devoted to a system solution for the integration and automation of production management of an industrial enterprise, expanding the space of its adjustable parameters and accelerating the response to current production events. The analysis and development of the architecture of an integrated information system providing integrated operational management was carried out in the conditions of the industrial revolution “Industry 4.0.” The objects, processes, and relations of production were studied in relation to other functional areas of the enterprise, from the point of view of both economic content and management and the logical structure of the information system.

The theoretical and experimental information on the establishment of diagnostic criteria for automatic digital thermal diagnostics of mechanical transmission components of transport and technological machines is summarized. According to the results of laboratory tests of the diagnostic device, the optimal value of the time interval for measuring the temperature of the diagnosed component according to the criterion of type II errors, false triggering, is determined.

A method for calculating the forces between intercar couplings is presented, which includes components of forces caused by the difference in the geometry of wheel tread surfaces from a conical shape, resulting from wheel wear. Wheel wear is accompanied by the appearance of additional inertia forces that affect the rolling characteristics of the wheel and the contact forces between the wheels and the rails, which are also included in the calculation of forces in the couplings that form the longitudinal dynamics of the train. The dependence of forces on vertical track irregularities is taken into account.

The results of research on the improvement of low-temperature plasma generators for surface treatment of wearing parts of technological equipment, as well as for modification of the surfaces of parts before the start of their operation, are presented. An analysis of the applied schemes of low-temperature plasma generators is carried out. Based on this analysis, the optimal scheme for the low-temperature plasma generators under consideration is selected and their main technical characteristics are presented. It has been established that, with a rational design and layout scheme and the correct choice of processing modes, the thermal efficiency of plasma processes increases with a simultaneous increase in the service life of the cathode of the low-temperature plasma generator. The results of this research made it possible to develop low-temperature plasma generators with an increased resource and improved energy characteristics for surface treatment of parts of technological equipment for beet sugar production.

During operation, technological equipment with computer numerical control inevitably has a reduced service life, so, to ensure its uninterrupted operation, repair work is carried out. Currently, equipment is repaired according to a predetermined guideline, which cannot guarantee the elimination of emergency situations, as it is imperfect. It is proposed to introduce a package of nondestructive testing of the equipment on the shop floor. The proposed package will allow for regular checks of the current condition of equipment components and assemblies. Based on the data obtained, it is possible to draw a conclusion about the operability of the equipment and to switch to its ordinary maintenance, which will reduce the cost of repairing and reduce the likelihood of its emergency failure.

An analysis of the results of obtaining thermomechanical diagrams based on the hypotheses of a plane stress–strain state and plane deformation of parts in TMC rings and cylinders is presented.

Dual-motor electric drives for industrial robotic systems are discussed, and their key technical specifications are defined. The types and parameters of the position and speed controllers for such drives have been selected, and a structural diagram of the control system is proposed to eliminate the errors caused by backlash in mechanical transmissions.

One of the main tasks when creating new technical solutions in mechanical engineering is the analysis of their novelty or innovativeness. The novelty and uniqueness of technical solutions is assessed by the degree to which the synthesized solutions differ from existing ones. The potential for development and improvement of technical solutions, as well as the ability to respond to environmental changes, is assessed. This article discusses two cases of determining the novelty of synthesized solutions in comparison with the basic set of options and reference options. Finally, it is concluded that the proposed approach improves the reliability of models adopted at the technical proposal stage.

This study addresses the practical application of the digital image correlation method for experimental investigation of significantly inhomogeneous residual stress fields using the “large hole” drilling technique. Specially designed polymer material samples were used, in which a high-gradient residual stress field was created based on the approach proposed by the authors. Recommendations for optimal relationships between the diameter of the hole-indicator of residual stresses and the geometric parameters of the sample were developed based on the analysis of numerical modeling results of typical problems. The research results demonstrate the effectiveness of using the digital image correlation method and the authors’ software for mathematical processing of tangential displacement fields to determine significantly inhomogeneous residual stress fields based on the “large hole” drilling method. The relative maximum deviation of residual stresses at characteristic points around the hole from their initial values does not exceed 4%, and the overall root-mean-square deviation is less than 7%.

The main problems of tribomechanics of high-speed electric centrifugal submersible pumps of the ESP AKM series (nominal speed 10 000 rpm) when operating in complicated oil wells are presented.