An Investigation on the Teeth Crowning Effects on the Transient EHL Performance of Large-Scale Wind Turbine Spur Gears
Crowning is applied to wind turbine gears, including spur gears, to ensure adequate stress distribution and contact localization in wind turbine main gearbox gears to improve the gear performance in the presence of misalignments. Each gear tooth is crowned along the face width using a parabolic curv...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-10-01
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| Series: | Lubricants |
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| Online Access: | https://www.mdpi.com/2075-4442/11/11/462 |
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| author | Hazim U. Jamali H. S. S. Aljibori Muhsin Jaber Jweeg Oday I. Abdullah Alessandro Ruggiero |
| author_facet | Hazim U. Jamali H. S. S. Aljibori Muhsin Jaber Jweeg Oday I. Abdullah Alessandro Ruggiero |
| author_sort | Hazim U. Jamali |
| collection | DOAJ |
| description | Crowning is applied to wind turbine gears, including spur gears, to ensure adequate stress distribution and contact localization in wind turbine main gearbox gears to improve the gear performance in the presence of misalignments. Each gear tooth is crowned along the face width using a parabolic curve that graduates from a maximum height at the edges and vanishes at the center of the tooth flank. This crowning transfers the elastohydrodynamic contact problem from a line to a point contact case where the surface curvatures and pressure gradient are considered in both directions of the solution space. A wide range of longitudinal crowning heights is considered in this analysis under heavily loaded teeth for typical large-scale wind turbine gears. Furthermore, the variation in the velocities is considered in the analysis. The full transient elastohydrodynamic point contact solution considers the non-Newtonian oil behavior, where the numerical solution is based on the finite difference method. This work is focused on the evaluation of the effectiveness of teeth’s longitudinal crowning in terms of the consequences on the resulting pressure distribution and the corresponding film thickness. The modification of the tooth flank significantly elevates the film thickness levels over the zones close to the tooth edges without a significant increase in the pressure values. Moreover, the zone close to the tooth edges from both sides, where the pressure is expected to drop to the ambient pressure, is extended as a result of the flank modification. |
| first_indexed | 2024-03-09T16:39:53Z |
| format | Article |
| id | doaj.art-2a8bcca27d5243f6b1131b13bf2f5495 |
| institution | Directory Open Access Journal |
| issn | 2075-4442 |
| language | English |
| last_indexed | 2024-03-09T16:39:53Z |
| publishDate | 2023-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Lubricants |
| spelling | doaj.art-2a8bcca27d5243f6b1131b13bf2f54952023-11-24T14:52:45ZengMDPI AGLubricants2075-44422023-10-01111146210.3390/lubricants11110462An Investigation on the Teeth Crowning Effects on the Transient EHL Performance of Large-Scale Wind Turbine Spur GearsHazim U. Jamali0H. S. S. Aljibori1Muhsin Jaber Jweeg2Oday I. Abdullah3Alessandro Ruggiero4Mechanical Engineering Department, College of Engineering, University of Kerbala, Karbala 56001, IraqAl-Warith Center for Crowd Engineering and Management Research, University of Warith Al-Anbiyaa, Karbala 56001, IraqCollege of Technical Engineering, Al-Farahidi University, Baghdad 00965, IraqDepartment of Energy Engineering, College of Engineering, University of Baghdad, Baghdad 10071, IraqDepartment of Industrial Engineering, University of Salerno, 84084 Fisciano, ItalyCrowning is applied to wind turbine gears, including spur gears, to ensure adequate stress distribution and contact localization in wind turbine main gearbox gears to improve the gear performance in the presence of misalignments. Each gear tooth is crowned along the face width using a parabolic curve that graduates from a maximum height at the edges and vanishes at the center of the tooth flank. This crowning transfers the elastohydrodynamic contact problem from a line to a point contact case where the surface curvatures and pressure gradient are considered in both directions of the solution space. A wide range of longitudinal crowning heights is considered in this analysis under heavily loaded teeth for typical large-scale wind turbine gears. Furthermore, the variation in the velocities is considered in the analysis. The full transient elastohydrodynamic point contact solution considers the non-Newtonian oil behavior, where the numerical solution is based on the finite difference method. This work is focused on the evaluation of the effectiveness of teeth’s longitudinal crowning in terms of the consequences on the resulting pressure distribution and the corresponding film thickness. The modification of the tooth flank significantly elevates the film thickness levels over the zones close to the tooth edges without a significant increase in the pressure values. Moreover, the zone close to the tooth edges from both sides, where the pressure is expected to drop to the ambient pressure, is extended as a result of the flank modification.https://www.mdpi.com/2075-4442/11/11/462crownspur gearlarge scalewind turbinetransient solution |
| spellingShingle | Hazim U. Jamali H. S. S. Aljibori Muhsin Jaber Jweeg Oday I. Abdullah Alessandro Ruggiero An Investigation on the Teeth Crowning Effects on the Transient EHL Performance of Large-Scale Wind Turbine Spur Gears Lubricants crown spur gear large scale wind turbine transient solution |
| title | An Investigation on the Teeth Crowning Effects on the Transient EHL Performance of Large-Scale Wind Turbine Spur Gears |
| title_full | An Investigation on the Teeth Crowning Effects on the Transient EHL Performance of Large-Scale Wind Turbine Spur Gears |
| title_fullStr | An Investigation on the Teeth Crowning Effects on the Transient EHL Performance of Large-Scale Wind Turbine Spur Gears |
| title_full_unstemmed | An Investigation on the Teeth Crowning Effects on the Transient EHL Performance of Large-Scale Wind Turbine Spur Gears |
| title_short | An Investigation on the Teeth Crowning Effects on the Transient EHL Performance of Large-Scale Wind Turbine Spur Gears |
| title_sort | investigation on the teeth crowning effects on the transient ehl performance of large scale wind turbine spur gears |
| topic | crown spur gear large scale wind turbine transient solution |
| url | https://www.mdpi.com/2075-4442/11/11/462 |
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