An Evaluation of the Design Parameters of a Variable Bearing Profile Considering Journal Perturbation in Rotor–Bearing Systems
A variety of bearing profile designs can be used to improve the performance of a rotor–bearing system in severe conditions, such as operating with a shaft misalignment. Misalignments usually occur due to a deformation of the journal, bearing wear, and installation errors. This paper investigates the...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-10-01
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| Series: | Designs |
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| Online Access: | https://www.mdpi.com/2411-9660/7/5/116 |
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| author | Adawiya Ali Hamzah Abbas Fadhil Abbas M. N. Mohammed H. S. S. Aljibori Hazim U. Jamali Oday I. Abdullah |
| author_facet | Adawiya Ali Hamzah Abbas Fadhil Abbas M. N. Mohammed H. S. S. Aljibori Hazim U. Jamali Oday I. Abdullah |
| author_sort | Adawiya Ali Hamzah |
| collection | DOAJ |
| description | A variety of bearing profile designs can be used to improve the performance of a rotor–bearing system in severe conditions, such as operating with a shaft misalignment. Misalignments usually occur due to a deformation of the journal, bearing wear, and installation errors. This paper investigates the effects of bearing design parameters under a 3D journal misalignment for a wide range of length-to-diameter ratios to consider short, finite-length, and long journal bearings. Furthermore, the dynamic response of the system to journal perturbation considering linear and parabolic bearing profiles is also investigated. A numerical solution is identified based on the finite difference method, and the equations of motion are derived based on a linear stability analysis in which the fourth-order Runge–Kutta method is used to obtain the journal trajectories. The results show that both profiles help to enhance the rotor–bearing system’s performance regarding the lubricant layer thickness and pressure distribution, in addition to the shaft critical speed over the entire considered range of length-to-diameter ratios. This enhancement reduces the misalignment negative effects on the system performance. The response of the rotor-bearing system to journal perturbation in the case of the parabolic profile are very close to the perfect alignment case in comparison with a linear modification. |
| first_indexed | 2024-03-10T21:19:55Z |
| format | Article |
| id | doaj.art-a313bc0f115445a988eb958ccb2b75f6 |
| institution | Directory Open Access Journal |
| issn | 2411-9660 |
| language | English |
| last_indexed | 2024-03-10T21:19:55Z |
| publishDate | 2023-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Designs |
| spelling | doaj.art-a313bc0f115445a988eb958ccb2b75f62023-11-19T16:12:03ZengMDPI AGDesigns2411-96602023-10-017511610.3390/designs7050116An Evaluation of the Design Parameters of a Variable Bearing Profile Considering Journal Perturbation in Rotor–Bearing SystemsAdawiya Ali Hamzah0Abbas Fadhil Abbas1M. N. Mohammed2H. S. S. Aljibori3Hazim U. Jamali4Oday I. Abdullah5Department of Energy Engineering, College of Engineering, University of Baghdad, Baghdad 10071, IraqAeronautical Technical Engineering Department, College of Technical Engineering, Al-Farahidi University, Baghdad 00965, IraqMechanical Engineering Department, College of Engineering, Gulf University, Sanad 26489, BahrainAl-Warith Center for Crowd Engineering and Management Research, University of Warith Al-Anbiyaa, Kerbala 56001, IraqMechanical Engineering Department, College of Engineering, University of Kerbala, Kerbala 56001, IraqDepartment of Energy Engineering, College of Engineering, University of Baghdad, Baghdad 10071, IraqA variety of bearing profile designs can be used to improve the performance of a rotor–bearing system in severe conditions, such as operating with a shaft misalignment. Misalignments usually occur due to a deformation of the journal, bearing wear, and installation errors. This paper investigates the effects of bearing design parameters under a 3D journal misalignment for a wide range of length-to-diameter ratios to consider short, finite-length, and long journal bearings. Furthermore, the dynamic response of the system to journal perturbation considering linear and parabolic bearing profiles is also investigated. A numerical solution is identified based on the finite difference method, and the equations of motion are derived based on a linear stability analysis in which the fourth-order Runge–Kutta method is used to obtain the journal trajectories. The results show that both profiles help to enhance the rotor–bearing system’s performance regarding the lubricant layer thickness and pressure distribution, in addition to the shaft critical speed over the entire considered range of length-to-diameter ratios. This enhancement reduces the misalignment negative effects on the system performance. The response of the rotor-bearing system to journal perturbation in the case of the parabolic profile are very close to the perfect alignment case in comparison with a linear modification.https://www.mdpi.com/2411-9660/7/5/116three-dimensional misalignmentprofile modificationnumerical solutiondynamic responseposition perturbation |
| spellingShingle | Adawiya Ali Hamzah Abbas Fadhil Abbas M. N. Mohammed H. S. S. Aljibori Hazim U. Jamali Oday I. Abdullah An Evaluation of the Design Parameters of a Variable Bearing Profile Considering Journal Perturbation in Rotor–Bearing Systems Designs three-dimensional misalignment profile modification numerical solution dynamic response position perturbation |
| title | An Evaluation of the Design Parameters of a Variable Bearing Profile Considering Journal Perturbation in Rotor–Bearing Systems |
| title_full | An Evaluation of the Design Parameters of a Variable Bearing Profile Considering Journal Perturbation in Rotor–Bearing Systems |
| title_fullStr | An Evaluation of the Design Parameters of a Variable Bearing Profile Considering Journal Perturbation in Rotor–Bearing Systems |
| title_full_unstemmed | An Evaluation of the Design Parameters of a Variable Bearing Profile Considering Journal Perturbation in Rotor–Bearing Systems |
| title_short | An Evaluation of the Design Parameters of a Variable Bearing Profile Considering Journal Perturbation in Rotor–Bearing Systems |
| title_sort | evaluation of the design parameters of a variable bearing profile considering journal perturbation in rotor bearing systems |
| topic | three-dimensional misalignment profile modification numerical solution dynamic response position perturbation |
| url | https://www.mdpi.com/2411-9660/7/5/116 |
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