Detuning of a Supercharger Rotor from Critical Rotational Velocities

Marchenko, Andrii; Grabovskiy, Andrey; Tkachuk, Mykola; Shut, Oleksandr

doi:10.1007/978-3-030-77823-1_14

Cited by 5 publications

(2 citation statements)

References 16 publications

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“…This is due to the fact that there is no research methodology that covers, on the one hand, all stages of the life cycle, and on the other -various processes and conditions that accompany the production and operation of existing installations. In addition, the operating conditions of modern installations and the requirements for them are constantly changing [14].…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Substantiating promising technical solutions for turbo- expander power plants based on the research into working processes and states

Tkachuk,

Lvov,

Kravchenko

et al. 2023

EEJET

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One of the most rational methods of energy utilization of compressed gas in pipelines is to use turbo-expander installations. In particular, these are autonomous turbo-expander power stations. A fundamentally new concept has been devised to improve the technical and economic performance of this type of machines. This concept is not focused on a separate aspect of the plant's operation but on their entire set. In particular, physical principles, structures, and technologies were considered as an object of research. First, effective parameters of gas-dynamic flows and heat-mass transfer were determined based on the modeling of work processes. Secondly, progressive designs of turbo-expander units have been created. Thirdly, technologies for the production of parts and assemblies of turbo-expander units have been developed, which combine, unlike the traditional ones, different types of strengthening for contacting parts in their pair. A method of parametric modeling was used to substantiate the technical solutions of the elements of turbo-expander power plants. This makes it possible to determine the technical characteristics of these installations under a certain set of parameters. By purposeful variation, a recommended set of their parameters was determined, which ensure the improvement of the most important technical characteristics. A specialized database was built, which contains an array of information about the regularities of the influence of variation of significant parameters on various characteristics of turbo-expander power plants. Already on this basis, the problems of synthesis of successful technical solutions of turbo-expander power plants are solved. As a result, their high energy efficiency is ensured. Thus, the efficiency of the expander was achieved at the level of 86 % while the resource increased by 20–25 %. All these solutions were implemented in a number of unique turbo-expander units. Their effectiveness has been demonstrated during operation

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Section: Literature Review and Problem Statementmentioning

confidence: 99%

Substantiating promising technical solutions for turbo- expander power plants based on the research into working processes and states

Tkachuk,

Lvov,

Kravchenko

et al. 2023

EEJET

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“…Rolling bearings are widely used in all branches of industrial production [1,2]. Many studies are devoted to modifying existing bearings [3,4], and improving their performance [5]. One of the most problematic bearing elements is the cage, which is subject to wear and fatigue failure.…”

Section: Introductionmentioning

confidence: 99%

A Systematic Approach for Energy-Efficient Design of Rolling Bearing Cages

et al. 2023

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Several aspects must be considered in the design of rolling bearing cages. One of the most important considerations relates to studying and developing a stationary approach for solving problems of heat and mass transfer during convection. In this context, this paper proposes, among other achievements, the development and validation of a model of heat generation that is used, as the basis for an energy-efficient cage design in the context of the roller bearings of axle boxes for rail transport. The forces of interaction of the cage with the bearing parts are determined. The energy-efficient design of the cage is performed with modified friction surfaces in the form of convex contours of the pockets and micro-hollows on the surfaces of the pockets and support rings. On the basis of a flat model, of the interaction between the cage and the bearing parts, the pressure forces on the driving and driven rolling elements in the zone of radial loading are determined. The frictional moment of the bearing has been determined based on the integral design of the cage without taking into account lubrication during the interaction of the cage with the jumpers and with the sides of the basing ring. The calculation of the temperature gradient with standard and improved designs of bearing cages has been performed while taking air blowing into account; results showed a decrease in the average level and growth rate of the bearings’ temperature gradient with an energy-efficient cage design. Based on the obtained results, and on the developed heat generation model, a systematic approach for energy-efficient design of rolling bearing cages is proposed. The proposed approach, as well as the respective developed models, were validated by obtaining and analyzing the experimental results.

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