Journal of Machinery Manufacture and Reliability最新文献

A principal strategy for safeguarding oilfield equipment against corrosion involves the application of polymer coatings to their operational surfaces, thereby creating multilayer metal–polymer constructs. This paper presents findings from an examination of how the stress–strain profile of such multilayer structures alters under the influence of aggressive environmental conditions.

The article systematizes the factors influencing reliability, identifies the failure rate at the operating stage for research, and proposes a fuzzy model for correcting the failure rate, taking into account the influence of real factors during operation. The results were tested on a Siemens-SGT-800 gas turbine.

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.

The problems of standardization of the shaft surface roughness for armored rubber cuffs are considered. It is revealed that a decrease in the shaft surface roughness leads to increased leakage, and with its increase, the wear of the cuff increases sharply. It is shown that the relative length of the profile bearing affects the cuff wear. In order to increase the durability of the sealing unit, it is recommended to standardize the surface roughness not only within a given range, but also to take into account the location of irregularities and the relative profile bearing length, which can be provided by surface-plastic deformation using rollers or balls.

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.