Tilting Pad Journal Bearing Ball and Socket Pivots: Experimental Determination of Stiffness
Tilting pad journal bearings (TPJB) are used in turbomachinery for their stability at high speeds. For design purposes, it is necessary to preliminarily investigate the turbomachine rotor dynamic behavior by simulation. The dynamic characteristics of all components must be known as precisely as poss...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2022-01-01
|
| Series: | Machines |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2075-1702/10/2/81 |
| _version_ | 1827654261214806016 |
|---|---|
| author | Enrico Ciulli Paola Forte Flavio Antonelli Roberto Minelli Daniele Panara |
| author_facet | Enrico Ciulli Paola Forte Flavio Antonelli Roberto Minelli Daniele Panara |
| author_sort | Enrico Ciulli |
| collection | DOAJ |
| description | Tilting pad journal bearings (TPJB) are used in turbomachinery for their stability at high speeds. For design purposes, it is necessary to preliminarily investigate the turbomachine rotor dynamic behavior by simulation. The dynamic characteristics of all components must be known as precisely as possible and experimental validation of each single model is required. While a lot of work has been carried out on bearings, the ball-and-socket stiffness is still estimated by means of Hertzian formulas. Recently, some authors have used the finite element method, but it seems that nothing has been done experimentally to date. This paper describes the test rig designed to determine the stiffness of a TPJB ball-and-socket pivot by equipping the grippers of a tensile universal testing machine with specifically designed interfaces. A methodology for evaluating the stiffness from the experimental results is reported. Preliminary compression results are presented and compared with the analytical ones obtained using Hertz’s formula showing significant differences for the ball-and-socket conformal contact. |
| first_indexed | 2024-03-09T21:34:51Z |
| format | Article |
| id | doaj.art-f3341fabf80b411c9336b1464536a865 |
| institution | Directory Open Access Journal |
| issn | 2075-1702 |
| language | English |
| last_indexed | 2024-03-09T21:34:51Z |
| publishDate | 2022-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Machines |
| spelling | doaj.art-f3341fabf80b411c9336b1464536a8652023-11-23T20:48:00ZengMDPI AGMachines2075-17022022-01-011028110.3390/machines10020081Tilting Pad Journal Bearing Ball and Socket Pivots: Experimental Determination of StiffnessEnrico Ciulli0Paola Forte1Flavio Antonelli2Roberto Minelli3Daniele Panara4Department of Civil and Industrial Engineering, University of Pisa, 56122 Pisa, ItalyDepartment of Civil and Industrial Engineering, University of Pisa, 56122 Pisa, ItalyDepartment of Civil and Industrial Engineering, University of Pisa, 56122 Pisa, ItalyDepartment of Civil and Industrial Engineering, University of Pisa, 56122 Pisa, ItalyBaker Hughes, 50127 Florence, ItalyTilting pad journal bearings (TPJB) are used in turbomachinery for their stability at high speeds. For design purposes, it is necessary to preliminarily investigate the turbomachine rotor dynamic behavior by simulation. The dynamic characteristics of all components must be known as precisely as possible and experimental validation of each single model is required. While a lot of work has been carried out on bearings, the ball-and-socket stiffness is still estimated by means of Hertzian formulas. Recently, some authors have used the finite element method, but it seems that nothing has been done experimentally to date. This paper describes the test rig designed to determine the stiffness of a TPJB ball-and-socket pivot by equipping the grippers of a tensile universal testing machine with specifically designed interfaces. A methodology for evaluating the stiffness from the experimental results is reported. Preliminary compression results are presented and compared with the analytical ones obtained using Hertz’s formula showing significant differences for the ball-and-socket conformal contact.https://www.mdpi.com/2075-1702/10/2/81tilting pad journal bearingball-and-socket pivotconformal contactHertzian contactcontact stiffnessHertzian formulas |
| spellingShingle | Enrico Ciulli Paola Forte Flavio Antonelli Roberto Minelli Daniele Panara Tilting Pad Journal Bearing Ball and Socket Pivots: Experimental Determination of Stiffness Machines tilting pad journal bearing ball-and-socket pivot conformal contact Hertzian contact contact stiffness Hertzian formulas |
| title | Tilting Pad Journal Bearing Ball and Socket Pivots: Experimental Determination of Stiffness |
| title_full | Tilting Pad Journal Bearing Ball and Socket Pivots: Experimental Determination of Stiffness |
| title_fullStr | Tilting Pad Journal Bearing Ball and Socket Pivots: Experimental Determination of Stiffness |
| title_full_unstemmed | Tilting Pad Journal Bearing Ball and Socket Pivots: Experimental Determination of Stiffness |
| title_short | Tilting Pad Journal Bearing Ball and Socket Pivots: Experimental Determination of Stiffness |
| title_sort | tilting pad journal bearing ball and socket pivots experimental determination of stiffness |
| topic | tilting pad journal bearing ball-and-socket pivot conformal contact Hertzian contact contact stiffness Hertzian formulas |
| url | https://www.mdpi.com/2075-1702/10/2/81 |
| work_keys_str_mv | AT enricociulli tiltingpadjournalbearingballandsocketpivotsexperimentaldeterminationofstiffness AT paolaforte tiltingpadjournalbearingballandsocketpivotsexperimentaldeterminationofstiffness AT flavioantonelli tiltingpadjournalbearingballandsocketpivotsexperimentaldeterminationofstiffness AT robertominelli tiltingpadjournalbearingballandsocketpivotsexperimentaldeterminationofstiffness AT danielepanara tiltingpadjournalbearingballandsocketpivotsexperimentaldeterminationofstiffness |