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Volume 11
Issue 4
10.3390/lubricants11040173
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Article

Analysis of Modified Finite Length Journal Bearing under Position Perturbation

by
Hazim U. Jamali
1,
Hakim S. Sultan
2,
Oday I. Abdullah
3,4,5,*,
Adnan Naji Jameel Al-Tamimi
6,
Murtadha M. Al-Masoudy
7,
Alessandro Ruggiero
8 and
Maria Cristina Valigi
9
1
Mechanical Engineering Department, College of Engineering, University of Kerbala, Karbala 56001, Iraq
2
College of Engineering Karbala, University of Warith Al-Anbiyaa, Karbala 56001, Iraq
3
Department of Energy Engineering, College of Engineering, University of Baghdad, Baghdad 47024, Iraq
4
Mechanical Engineering Department, College of Engineering, Gulf University, Sanad 26489, Bahrain
5
Institute of Laser and Systems Technologies (iLAS), Hamburg University of Technology (TUHH), Harburger Schloßstraße 28, 21079 Hamburg, Germany
6
College of Technical Engineering, Al-Farahidi University, Baghdad 47024, Iraq
7
Air Conditioning and Refrigeration Techniques Engineering Department, Al-Mustaqbal University College, Babylon 51001, Iraq
8
Department of Industrial Engineering, University of Salerno, 84084 Fisciano, Italy
9
Department of Engineering, University of Perugia, Via G. Duranti 1, 06125 Perugia, Italy
*
Author to whom correspondence should be addressed.
Lubricants 2023, 11(4), 173; https://doi.org/10.3390/lubricants11040173
Submission received: 3 March 2023 / Revised: 21 March 2023 / Accepted: 6 April 2023 / Published: 11 April 2023
(This article belongs to the Special Issue Green Tribology: New Insights toward a Sustainable World 2023)
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Abstract

The performance of journal bearings is significantly affected by the presence of misalignment, which is usually an accompanying problem for this type of bearing. This includes exceeding the design limits for the maximum pressure and the minimum film thickness levels, which affect, in other words, the load-carrying capacity of the system. In addition, it raises the possibility of increasing the wear rate at the bearing edges and increases the friction coefficient at high levels of misalignment. This paper deals with the problem of finite-length misaligned journal bearings, considering a novel comparison between two cases of misalignments: the general 3D misalignment and the vertical misalignment problems for modified bearings. The effect of introducing a variable axial bearing profile on the bearing characteristics and the time responses of the rotor bearing system under position perturbation has also been investigated. The numerical solution of this hydrodynamic problem is based on the finite difference method using Reynolds boundary conditions method. Results show that using a variable bearing profile improves bearing characteristics, such as increasing the minimum film thickness significantly and reducing the pressure levels in addition to reducing the friction coefficient. Furthermore, the modification enhances the rotor-bearing stability under position perturbation, extending the speed range for a safe operation.
Keywords: sustainable sources of energy; journal bearing; numerical analysis; stability problem sustainable sources of energy; journal bearing; numerical analysis; stability problem

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MDPI and ACS Style

Jamali, H.U.; Sultan, H.S.; Abdullah, O.I.; Jameel Al-Tamimi, A.N.; Al-Masoudy, M.M.; Ruggiero, A.; Valigi, M.C. Analysis of Modified Finite Length Journal Bearing under Position Perturbation. Lubricants 2023, 11, 173. https://doi.org/10.3390/lubricants11040173

AMA Style

Jamali HU, Sultan HS, Abdullah OI, Jameel Al-Tamimi AN, Al-Masoudy MM, Ruggiero A, Valigi MC. Analysis of Modified Finite Length Journal Bearing under Position Perturbation. Lubricants. 2023; 11(4):173. https://doi.org/10.3390/lubricants11040173

Chicago/Turabian Style

Jamali, Hazim U., Hakim S. Sultan, Oday I. Abdullah, Adnan Naji Jameel Al-Tamimi, Murtadha M. Al-Masoudy, Alessandro Ruggiero, and Maria Cristina Valigi. 2023. "Analysis of Modified Finite Length Journal Bearing under Position Perturbation" Lubricants 11, no. 4: 173. https://doi.org/10.3390/lubricants11040173

APA Style

Jamali, H. U., Sultan, H. S., Abdullah, O. I., Jameel Al-Tamimi, A. N., Al-Masoudy, M. M., Ruggiero, A., & Valigi, M. C. (2023). Analysis of Modified Finite Length Journal Bearing under Position Perturbation. Lubricants, 11(4), 173. https://doi.org/10.3390/lubricants11040173

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