A Numerical Investigation of the Effects of Groove Texture on the Dynamics of a Water-Lubricated Bearing–Rotor System
This paper aims to investigate the combined effects of working condition and structural parameters of groove texture on the dynamic characteristics, stability and unbalance response of a water-lubricated hydrodynamic bearing–rotor system to avoid instability and excessive vibration of the rotor. The...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-05-01
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| Series: | Lubricants |
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| Online Access: | https://www.mdpi.com/2075-4442/11/6/242 |
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| author | Huihui Feng Zhiwei Gao Ron. A. J. Van Ostayen Xiaofeng Zhang |
| author_facet | Huihui Feng Zhiwei Gao Ron. A. J. Van Ostayen Xiaofeng Zhang |
| author_sort | Huihui Feng |
| collection | DOAJ |
| description | This paper aims to investigate the combined effects of working condition and structural parameters of groove texture on the dynamic characteristics, stability and unbalance response of a water-lubricated hydrodynamic bearing–rotor system to avoid instability and excessive vibration of the rotor. The Navier–Stokes equation, standard <i>K-ε</i> model with enhanced wall treatment and Zwart–Gerber–Belamri cavitation model are considered using the commercial software Fluent to calculate the stiffness and damping coefficients of a groove-textured, water-lubricated bearing based on the dynamic mesh method; the critical mass to express the stability and the unbalance response solved by the fourth order Runge–Kutta method of the rotor are calculated based on dynamic equations. The results indicate that shallower and longer groove textures can improve the direct stiffness along the load direction <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>k</mi><mrow><mi>y</mi><mi>y</mi></mrow></msub></mrow></semantics></math></inline-formula>, weaken the stiffness in the orthogonal direction <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>k</mi><mrow><mi>x</mi><mi>x</mi></mrow></msub></mrow></semantics></math></inline-formula>, improve stability and decrease the unbalance response amplitude of the water-lubricated bearing–rotor system at a greater rotational speed and smaller eccentricity ratio; however, the impact of grooves on damping parameters is not as great as it is on stiffness—there exists an optimum groove width to achieve a best dynamic performance. |
| first_indexed | 2024-03-11T02:13:52Z |
| format | Article |
| id | doaj.art-d7ff6f8c7df64663a40c178e3fd10c1c |
| institution | Directory Open Access Journal |
| issn | 2075-4442 |
| language | English |
| last_indexed | 2024-03-11T02:13:52Z |
| publishDate | 2023-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Lubricants |
| spelling | doaj.art-d7ff6f8c7df64663a40c178e3fd10c1c2023-11-18T11:19:43ZengMDPI AGLubricants2075-44422023-05-0111624210.3390/lubricants11060242A Numerical Investigation of the Effects of Groove Texture on the Dynamics of a Water-Lubricated Bearing–Rotor SystemHuihui Feng0Zhiwei Gao1Ron. A. J. Van Ostayen2Xiaofeng Zhang3College of Mechanical and Electrical Engineering, Hohai University, Changzhou 213022, ChinaCollege of Mechanical and Electrical Engineering, Hohai University, Changzhou 213022, ChinaDepartment of Precision and Microsystems Engineering, Delft University of Technology, 2628 CD Delft, The NetherlandsCollege of Mechanical and Electrical Engineering, Hohai University, Changzhou 213022, ChinaThis paper aims to investigate the combined effects of working condition and structural parameters of groove texture on the dynamic characteristics, stability and unbalance response of a water-lubricated hydrodynamic bearing–rotor system to avoid instability and excessive vibration of the rotor. The Navier–Stokes equation, standard <i>K-ε</i> model with enhanced wall treatment and Zwart–Gerber–Belamri cavitation model are considered using the commercial software Fluent to calculate the stiffness and damping coefficients of a groove-textured, water-lubricated bearing based on the dynamic mesh method; the critical mass to express the stability and the unbalance response solved by the fourth order Runge–Kutta method of the rotor are calculated based on dynamic equations. The results indicate that shallower and longer groove textures can improve the direct stiffness along the load direction <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>k</mi><mrow><mi>y</mi><mi>y</mi></mrow></msub></mrow></semantics></math></inline-formula>, weaken the stiffness in the orthogonal direction <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>k</mi><mrow><mi>x</mi><mi>x</mi></mrow></msub></mrow></semantics></math></inline-formula>, improve stability and decrease the unbalance response amplitude of the water-lubricated bearing–rotor system at a greater rotational speed and smaller eccentricity ratio; however, the impact of grooves on damping parameters is not as great as it is on stiffness—there exists an optimum groove width to achieve a best dynamic performance.https://www.mdpi.com/2075-4442/11/6/242surface texturewater-lubricated hydrodynamic bearingdynamic characteristicsstabilityunbalance responserigid rotor |
| spellingShingle | Huihui Feng Zhiwei Gao Ron. A. J. Van Ostayen Xiaofeng Zhang A Numerical Investigation of the Effects of Groove Texture on the Dynamics of a Water-Lubricated Bearing–Rotor System Lubricants surface texture water-lubricated hydrodynamic bearing dynamic characteristics stability unbalance response rigid rotor |
| title | A Numerical Investigation of the Effects of Groove Texture on the Dynamics of a Water-Lubricated Bearing–Rotor System |
| title_full | A Numerical Investigation of the Effects of Groove Texture on the Dynamics of a Water-Lubricated Bearing–Rotor System |
| title_fullStr | A Numerical Investigation of the Effects of Groove Texture on the Dynamics of a Water-Lubricated Bearing–Rotor System |
| title_full_unstemmed | A Numerical Investigation of the Effects of Groove Texture on the Dynamics of a Water-Lubricated Bearing–Rotor System |
| title_short | A Numerical Investigation of the Effects of Groove Texture on the Dynamics of a Water-Lubricated Bearing–Rotor System |
| title_sort | numerical investigation of the effects of groove texture on the dynamics of a water lubricated bearing rotor system |
| topic | surface texture water-lubricated hydrodynamic bearing dynamic characteristics stability unbalance response rigid rotor |
| url | https://www.mdpi.com/2075-4442/11/6/242 |
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