Revealing deformation of segments and their supports in a hydrostatic segmental bearing

Authors

DOI:

https://doi.org/10.15587/1729-4061.2021.239066

Keywords:

segmental bearing, segment deformation, bearing characteristics, differential equation, calculation results

Abstract

At present, there are theoretical and experimental studies of such bearings without taking into account the elastic deformation of the bearing segments. The rotor bearings of powerful turbines at nuclear power plants are subjected to loads as high as tens of tons. One of the important issues in designing segmental bearings operating under these conditions consists in taking into account elastic deformations of the segments. A schematic diagram of a segmental hydrostatic bearing was presented and the principle of its operation was described. When determining the deformation of spherical support, a formula of change in volume of a solid steel ball subjected to uniform pressure was applied.

To determine the segment deformation in the axial direction, differential equation of bending of the strip beam as the initial one. The basic equation of deformation of rods with a curved axis acting in the plane of curvature was taken as a starting point of determining the segment deformation in the circumferential direction.

It was found in the studies that the maximum deformation of the segment is 4.5 % of radial clearance at a feed pressure of 5 MPa and can affect the bearing characteristics. A substantially nonlinear character of deformations along the segment axis was revealed. It was found that the pressure of the working fluid significantly affects the segment thickness. With an increase in feeding pressure from 1 MPa to 10 MPa, the thickness of the steel segment increased more than 2 times and the thickness of the bronze segment increased more than 3 times. It was established that the pressure of the working fluid exceeding 10 MPa substantially affects the deformation of the spherical support and the bearing clearance.

The study results will make it possible to determine more accurately the main characteristics of the segmental bearing and design it more efficiently.

Author Biography

Vladimir Nazin, National Aerospace University "Kharkiv Aviation Institute"

Doctor of Technical Sciences

Department of Theoretical Mechanics, Mechanical Engineering and Robotic Mechanical Systems

References

  1. Hu, Z., Wang, Z., Huang, W., Wang, X. (2019). Supporting and friction properties of magnetic fluids bearings. Tribology International, 130, 334–338. doi: https://doi.org/10.1016/j.triboint.2018.10.006
  2. Xu, H., Yang, J., Gao, L., An, Q. (2020). The influences of bump foil structure parameters on the static and dynamic characteristics of bump-type gas foil bearings. Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, 234 (10), 1642–1657. doi: https://doi.org/10.1177/1350650120912609
  3. Koosha, R., San Andrés, L. (2020). A Computational Model for the Analysis of the Static Forced Performance of Self-Equalizing Tilting Pad Thrust Bearings. Journal of Engineering for Gas Turbines and Power, 142 (10). doi: https://doi.org/10.1115/1.4048458
  4. Xiang, G., Han, Y., He, T., Wang, J., Xiao, K., Li, J. (2020). Wear and fluid-solid-thermal transient coupled model for journal bearings. Applied Mathematical Modelling, 85, 19–45. doi: https://doi.org/10.1016/j.apm.2020.03.037
  5. Santos, I. (2018). Controllable Sliding Bearings and Controllable Lubrication Principles – An Overview. Lubricants, 6 (1), 16. doi: https://doi.org/10.3390/lubricants6010016
  6. EL-Said, A. K., EL-Souhily, B. M., Crosby, W. A., EL-Gamal, H. A. (2017). The performance and stability of three-lobe journal bearing textured with micro protrusions. Alexandria Engineering Journal, 56 (4), 423–432. doi: https://doi.org/10.1016/j.aej.2017.08.003
  7. Summer, F., Bergmann, P., Grün, F. (2017). Damage Equivalent Test Methodologies as Design Elements for Journal Bearing Systems. Lubricants, 5 (4), 47. doi: https://doi.org/10.3390/lubricants5040047
  8. Zernin, M. V., Mishin, A. V., Rybkin, N. N., Shil’ko, S. V., Ryabchenko, T. V. (2017). Consideration of the multizone hydrodynamic friction, the misalignment of axes, and the contact compliance of a shaft and a bush of sliding bearings. Journal of Friction and Wear, 38 (3), 242–251. doi: https://doi.org/10.3103/s1068366617030163
  9. Zhang, J., Tan, A., Spikes, H. (2016). Effect of Base Oil Structure on Elastohydrodynamic Friction. Tribology Letters, 65 (1). doi: https://doi.org/10.1007/s11249-016-0791-7
  10. Villaverde, R. (2016). Base isolation with sliding hydromagnetic bearings: concept and feasibility study. Structure and Infrastructure Engineering, 13 (6), 709–721. doi: https://doi.org/10.1080/15732479.2016.1187634
  11. Polyakov, R., Savin, L., Fetisov, A. (2018). Analysis of the conditions for the occurrence of the effect of a minimum of friction in hybrid bearings based on the load separation principle. Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, 233 (2), 271–280. doi: https://doi.org/10.1177/1350650118777143
  12. Schüler, E., Berner, O. (2021). Improvement of Tilting-Pad Journal Bearing Operating Characteristics by Application of Eddy Grooves. Lubricants, 9 (2), 18. doi: https://doi.org/10.3390/lubricants9020018
  13. Kukla, S., Buchhorn, N., Bender, B. (2016). Design of an axially concave pad profile for a large turbine tilting-pad bearing. Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, 231 (4), 479–488. doi: https://doi.org/10.1177/1350650115592919
  14. Artemenko, N. P., Nazin, V. I. (1982). Raschet harakteristik mnogosegmentnyh gidrostaticheskih podshipnikov s tochechnymi kamerami. Issledovanie gidrostaticheskih opor i uplotneniy dvigateley letatel'nyh apparatov, 1, 12–22.
  15. Timoshenko, S. P. (1972). Kurs teorii uprugosti. Kyiv: Naukova dumka, 832.
  16. Korn, G., Korn, T. (1974). Spravochnik po matematike. Moscow: Nauka, 832.
  17. Timoshenko, S. P., Lessel's, Dzh. (1931). Prikladnaya teoriya uprugosti. Leningrad: Gostekhizdat, 394.

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Published

2021-08-31

How to Cite

Nazin, V. (2021). Revealing deformation of segments and their supports in a hydrostatic segmental bearing . Eastern-European Journal of Enterprise Technologies, 4(7(112), 33–40. https://doi.org/10.15587/1729-4061.2021.239066

Issue

Vol. 4 No. 7(112) (2021): Applied mechanics

Section

Applied mechanics

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Copyright (c) 2021 Vladimir Nazin

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