A Numerical Model for the Analysis of the Bearings of a Diesel Engine Subjected to Conditions of Wear and Misalignment
In the present work, a numerical model is developed to investigate the influence of wear and misalignment on the bearings of a stationary diesel engine. The model implemented considers the effects of surface wear on the bearing, cavitation effects, and surface roughness. For the numerical analysis,...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-04-01
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| Series: | Lubricants |
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| Online Access: | https://www.mdpi.com/2075-4442/9/4/42 |
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| author | Carlos Pardo García Jhan Piero Rojas Sofia Orjuela Abril |
| author_facet | Carlos Pardo García Jhan Piero Rojas Sofia Orjuela Abril |
| author_sort | Carlos Pardo García |
| collection | DOAJ |
| description | In the present work, a numerical model is developed to investigate the influence of wear and misalignment on the bearings of a stationary diesel engine. The model implemented considers the effects of surface wear on the bearing, cavitation effects, and surface roughness. For the numerical analysis, changes in the surface roughness of <inline-formula>σμ<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi mathvariant="sans-serif">σ</mi><mo>=</mo><mn>0.75</mn><mrow><mtext> </mtext><mi mathvariant="sans-serif">μ</mi><mi mathvariant="normal">m</mi></mrow></mrow></semantics></math></inline-formula>, <inline-formula>σμ<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi mathvariant="sans-serif">σ</mi><mo>=</mo><mn>1</mn><mrow><mtext> </mtext><mi mathvariant="sans-serif">μ</mi><mi mathvariant="normal">m</mi></mrow></mrow></semantics></math></inline-formula>, and <inline-formula>σμ<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi mathvariant="sans-serif">σ</mi><mo>=</mo><mn>1.25</mn><mrow><mtext> </mtext><mi mathvariant="sans-serif">μ</mi><mi mathvariant="normal">m</mi></mrow></mrow></semantics></math></inline-formula> are defined, and changes in the bearing load of 50%, 75%, and 100%. The results demonstrated that increasing the surface roughness intensifies the bearing wear, which represents 18% and 140% of the bearing clearance for the roughness of <inline-formula>σμ<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi mathvariant="sans-serif">σ</mi><mo>=</mo><mn>1</mn><mrow><mtext> </mtext><mi mathvariant="sans-serif">μ</mi><mi mathvariant="normal">m</mi></mrow></mrow></semantics></math></inline-formula> and <inline-formula>σμ<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi mathvariant="sans-serif">σ</mi><mo>=</mo><mn>1.25</mn><mrow><mtext> </mtext><mi mathvariant="sans-serif">μ</mi><mi mathvariant="normal">m</mi></mrow></mrow></semantics></math></inline-formula>, respectively. Additionally, the surface roughness causes a considerable increase in the bearing wear rate. The results described a maximum wear rate of <inline-formula>μ<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>20</mn><mrow><mtext> </mtext><mi mathvariant="sans-serif">μ</mi><mi mathvariant="normal">m</mi></mrow><mo>/</mo><mi mathvariant="normal">s</mi></mrow></semantics></math></inline-formula>. In general, increasing the bearing load by 25% doubles the hydrodynamic pressure conditions increases friction force by 33%, and reduces lubrication film thickness by 12%. The analysis of the angle of deflection, <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>ϕ</mi><mi>x</mi></msub></mrow></semantics></math></inline-formula> and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>ϕ</mi><mi>y</mi></msub></mrow></semantics></math></inline-formula>, shows that the moment and the degree of misalignment tend to increase significantly with the increase in the magnitude of the angle <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>ϕ</mi><mi>y</mi></msub></mrow></semantics></math></inline-formula>. Negative angles of deflection, <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>ϕ</mi><mi>x</mi></msub></mrow></semantics></math></inline-formula>, produce a greater increase in the degree of misalignment and the moment. This implies a greater chance of contact with the bearing surface. In conclusion, the proposed methodology serves as a reliable tool to simultaneously evaluate key parameters on the tribological behavior of bearings that further extend their endurance and minimize wear damage. |
| first_indexed | 2024-03-10T12:28:31Z |
| format | Article |
| id | doaj.art-f415bd0338b54bbc9cfcd505e078779c |
| institution | Directory Open Access Journal |
| issn | 2075-4442 |
| language | English |
| last_indexed | 2024-03-10T12:28:31Z |
| publishDate | 2021-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Lubricants |
| spelling | doaj.art-f415bd0338b54bbc9cfcd505e078779c2023-11-21T14:54:33ZengMDPI AGLubricants2075-44422021-04-01944210.3390/lubricants9040042A Numerical Model for the Analysis of the Bearings of a Diesel Engine Subjected to Conditions of Wear and MisalignmentCarlos Pardo García0Jhan Piero Rojas1Sofia Orjuela Abril2Programa de Ingeniería de Sistemas, Universidad Francisco de Paula Santander, Avenida Gran Colombia No. 12E-96 Barrio Colsag, San José de Cúcuta 540001, ColombiaFacultad de Ingeniería, Universidad Francisco de Paula Santander, Avenida Gran Colombia No. 12E-96 Barrio Colsag, San José de Cúcuta 540001, ColombiaPrograma de Administración de Empresas, Universidad Francisco de Paula Santander, Avenida Gran Colombia No. 12E-96 Barrio Colsag, San José de Cúcuta 540001, ColombiaIn the present work, a numerical model is developed to investigate the influence of wear and misalignment on the bearings of a stationary diesel engine. The model implemented considers the effects of surface wear on the bearing, cavitation effects, and surface roughness. For the numerical analysis, changes in the surface roughness of <inline-formula>σμ<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi mathvariant="sans-serif">σ</mi><mo>=</mo><mn>0.75</mn><mrow><mtext> </mtext><mi mathvariant="sans-serif">μ</mi><mi mathvariant="normal">m</mi></mrow></mrow></semantics></math></inline-formula>, <inline-formula>σμ<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi mathvariant="sans-serif">σ</mi><mo>=</mo><mn>1</mn><mrow><mtext> </mtext><mi mathvariant="sans-serif">μ</mi><mi mathvariant="normal">m</mi></mrow></mrow></semantics></math></inline-formula>, and <inline-formula>σμ<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi mathvariant="sans-serif">σ</mi><mo>=</mo><mn>1.25</mn><mrow><mtext> </mtext><mi mathvariant="sans-serif">μ</mi><mi mathvariant="normal">m</mi></mrow></mrow></semantics></math></inline-formula> are defined, and changes in the bearing load of 50%, 75%, and 100%. The results demonstrated that increasing the surface roughness intensifies the bearing wear, which represents 18% and 140% of the bearing clearance for the roughness of <inline-formula>σμ<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi mathvariant="sans-serif">σ</mi><mo>=</mo><mn>1</mn><mrow><mtext> </mtext><mi mathvariant="sans-serif">μ</mi><mi mathvariant="normal">m</mi></mrow></mrow></semantics></math></inline-formula> and <inline-formula>σμ<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi mathvariant="sans-serif">σ</mi><mo>=</mo><mn>1.25</mn><mrow><mtext> </mtext><mi mathvariant="sans-serif">μ</mi><mi mathvariant="normal">m</mi></mrow></mrow></semantics></math></inline-formula>, respectively. Additionally, the surface roughness causes a considerable increase in the bearing wear rate. The results described a maximum wear rate of <inline-formula>μ<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>20</mn><mrow><mtext> </mtext><mi mathvariant="sans-serif">μ</mi><mi mathvariant="normal">m</mi></mrow><mo>/</mo><mi mathvariant="normal">s</mi></mrow></semantics></math></inline-formula>. In general, increasing the bearing load by 25% doubles the hydrodynamic pressure conditions increases friction force by 33%, and reduces lubrication film thickness by 12%. The analysis of the angle of deflection, <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>ϕ</mi><mi>x</mi></msub></mrow></semantics></math></inline-formula> and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>ϕ</mi><mi>y</mi></msub></mrow></semantics></math></inline-formula>, shows that the moment and the degree of misalignment tend to increase significantly with the increase in the magnitude of the angle <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>ϕ</mi><mi>y</mi></msub></mrow></semantics></math></inline-formula>. Negative angles of deflection, <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>ϕ</mi><mi>x</mi></msub></mrow></semantics></math></inline-formula>, produce a greater increase in the degree of misalignment and the moment. This implies a greater chance of contact with the bearing surface. In conclusion, the proposed methodology serves as a reliable tool to simultaneously evaluate key parameters on the tribological behavior of bearings that further extend their endurance and minimize wear damage.https://www.mdpi.com/2075-4442/9/4/42engine bearingsdeflection anglemisalignmentsurface roughness |
| spellingShingle | Carlos Pardo García Jhan Piero Rojas Sofia Orjuela Abril A Numerical Model for the Analysis of the Bearings of a Diesel Engine Subjected to Conditions of Wear and Misalignment Lubricants engine bearings deflection angle misalignment surface roughness |
| title | A Numerical Model for the Analysis of the Bearings of a Diesel Engine Subjected to Conditions of Wear and Misalignment |
| title_full | A Numerical Model for the Analysis of the Bearings of a Diesel Engine Subjected to Conditions of Wear and Misalignment |
| title_fullStr | A Numerical Model for the Analysis of the Bearings of a Diesel Engine Subjected to Conditions of Wear and Misalignment |
| title_full_unstemmed | A Numerical Model for the Analysis of the Bearings of a Diesel Engine Subjected to Conditions of Wear and Misalignment |
| title_short | A Numerical Model for the Analysis of the Bearings of a Diesel Engine Subjected to Conditions of Wear and Misalignment |
| title_sort | numerical model for the analysis of the bearings of a diesel engine subjected to conditions of wear and misalignment |
| topic | engine bearings deflection angle misalignment surface roughness |
| url | https://www.mdpi.com/2075-4442/9/4/42 |
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