Numerical Modeling on the Compliance and Load Capacity of a Two-Row Aerostatic Journal Bearing with Longitudinal Microgrooves in the Inter-Row Zone : научное издание | Научно-инновационный портал СФУ

Numerical Modeling on the Compliance and Load Capacity of a Two-Row Aerostatic Journal Bearing with Longitudinal Microgrooves in the Inter-Row Zone : научное издание

Тип публикации: статья из журнала

Год издания: 2021

Идентификатор DOI: 10.3390/app11125714

Ключевые слова: aerostatic journal bearing, compliance, load capacity, longitudinal microgrooves

Аннотация: Aerostatic bearings are attractive, with minimal friction losses, high durability, and environmental friendliness. However, such designs have a number of disadvantages, including low load-bearing capacity and high compliance due to high air compressibility and limited injection pressure. The article proposes a double-row aerostatic journal bearing with an external combined throttling system and longitudinal microgrooves in the inter-row zone. It is hypothesized that the use of microgrooves will reduce the circumferential flows of compressed air, as a result of which the compliance should decrease and the bearing capacity should increase. To test the hypothesis, we carried out the mathematical modeling, calculations, and theoretical study of stationary operation modes of the bearing for small shaft eccentricities in the vicinity of the central equilibrium position of the shaft and bearing capacity for arbitrary eccentricities. Formulas were obtained for the numerical evaluation of compliance for bearings with a smooth bushing surface and with longitudinal microgrooves. Iterative finite-difference methods for evaluating the fields of the squared pressure are proposed, on the basis of which the load capacity of the bearings is calculated. Experimental verification of the bearing's theoretical characteristics was carried out, which showed satisfactory agreement between the compared data. The study of the compliance and load capacity of a microgroove bearing yielded impressive results. We show that the positive effect from the application of the improvement begins to manifest itself already at four microgrooves; the effect becomes significant at six microgrooves, and at twelve or more microgrooves, the circumferential flows in the bearing gap practically disappear; therefore, the bearing characteristics can be calculated on the basis of one-dimensional models of air lubrication longitudinal flow. Calculations have shown that for a length of L = 1, the maximum load capacity of a bearing with microgrooves is 1.5 times higher than that of a conventional bearing; for L >= 1.5, the bearing capacity increases twice or more. The result obtained allows us to recommend the proposed improvement for practical use in order to increase the load capacity of aerostatic journal bearings significantly. Aerostatic bearings are attractive, with minimal friction losses, high durability, and environmental friendliness. However, such designs have a number of disadvantages, including low load-bearing capacity and high compliance due to high air compressibilit

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Издание

Журнал: APPLIED SCIENCES-BASEL

Выпуск журнала: Vol. 11, Is. 12

Номера страниц: 5714

ISSN журнала: 20763417

Место издания: BASEL

Издатель: MDPI

Авторы

  • Kodnyanko Vladimir (Siberian Fed Univ, Polytech Inst, Krasnoyarsk 660079, Russia)
  • Shatokhin Stanislav (Siberian Fed Univ, Polytech Inst, Krasnoyarsk 660079, Russia)
  • Kurzakov Andrey (Siberian Fed Univ, Polytech Inst, Krasnoyarsk 660079, Russia)
  • Pikalov Yuri (Siberian Fed Univ, Polytech Inst, Krasnoyarsk 660079, Russia)
  • Pikalov Iakov (Siberian Fed Univ, Polytech Inst, Krasnoyarsk 660079, Russia)
  • Grigorieva Olga (Siberian Fed Univ, Polytech Inst, Krasnoyarsk 660079, Russia)
  • Strok Lilia (Siberian Fed Univ, Polytech Inst, Krasnoyarsk 660079, Russia)
  • Brungardt Maxim (Siberian Fed Univ, Polytech Inst, Krasnoyarsk 660079, Russia)

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