Journal of Machinery Manufacture and Reliability最新文献

The bearing units of a high-speed ESP installation are considered. The choice of tribocoupling materials is presented based on the criterion of the conditional load-carrying capacity, which determines the comparative wear resistance of tribocoupling materials.

The application of a discrete wavelet transform, in particular Daubechies wavelets, to improve the accuracy and sensitivity of a leak detection system in main pipeline transport of oil and petroleum products is discussed. This study opens up prospects for further development and adaptation of the presented methods for transmitting technological information by communication channels.

Films of the CrMnFeCoNiCu high-temperature alloy have been deposited onto a steel substrate by vacuum sputtering in the magnetron evaporation mode. The local atomic structure and phase composition are studied. The structural state of the CrMnFeCoNiCu alloy is determined by the superposition of contributions of equiatomic simple cubic lattices with lattice parameters of the P1 space group. Reflexes from the S1 and S2 phases contribute to the integral intensity; the contribution is 65.7 and 28.9%, respectively. The spatial distribution of the atoms obtained by theoretical analysis for the S1 and S2 lattices confirms that the chosen composition is a solid solution and that secondary phases are absent.

The problems of ensuring high technical and economic performance of flexible automated lines of mechanical assembly production through the development of a methodology for determining the optimal parameters of the automated storage and retrieval system are considered. The functioning of a flexible automated line is simulated in order to verify the adequacy of the methodology developed. As a result of this research, an algorithm of the methodology for providing the optimal parameters of the automated storage and retrieval system is developed, the use of which makes it possible to increase the accuracy and reduce the labor intensity of the development of the design and technological solutions at the initial stage of design of automated lines of mechanical assembly productions.

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 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.

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.

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.