Tilting Pad Journal Bearing Ball and Socket Pivots: Experimental Determination of Stiffness

Ciulli, Enrico; Forte, Paola; Antonelli, Flavio; Minelli, Roberto; Panara, Daniele

doi:10.3390/machines10020081

Cited by 10 publications

(3 citation statements)

References 25 publications

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“…Contact mechanics studies are also part of this branch. The applicability of some classical formulas is questionable for some particular contacts, as evidenced experimentally in the work presented in [27], while the formulas can be implemented in modern programs to allow a more comprehensive analysis [28]. Molecular dynamics simulations can also be considered among the fundamental studies, but they can also be included in the Tribology of Materials and in the Lubricants and Micro and Nanotribology branches, similarly to all basic studies on different materials and lubricants up to the micro-nano level.…”

Section: Fundamental Tribologymentioning

confidence: 99%

Vastness of Tribology Research Fields and Their Contribution to Sustainable Development

Ciulli

2024

Lubricants

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Tribology is related to all studies on friction, wear, and lubrication. One of the main aims of these studies is a reduction in friction and wear. Tribology is extremely vast, being also multidisciplinary and interdisciplinary. Therefore, it is very difficult to organize the several tribology subjects in an unique way and different classifications have been proposed by different authors. In this work, several subjects treated by tribology are reviewed and organized in six branches: Fundamental Tribology, Tribology of Materials and Lubricants, Micro and Nanotribology, Industrial Tribology, Biotribology, and New Frontiers of Tribology. The main subjects treated by the six branches are briefly reviewed in this paper in order to highlight the vastness of tribology and its important contribution to sustainability. Particularly, friction and wear reductions are strictly related to greater efficiency and material saving, which means less energy losses and material wastes, less pollution and therefore a more sustainable life according to the sustainable development goals. The connections among the latter and the several different tribological subjects are discussed.

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Section: Fundamental Tribologymentioning

confidence: 99%

Vastness of Tribology Research Fields and Their Contribution to Sustainable Development

Ciulli

2024

Lubricants

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“…Contact mechanics studies are also part of this branch. The applicability of some classical formulas is questionable for some particular contacts, as evidenced experimentally in [27], while the formulas can be implemented in modern programs to allow a more comprehensive analysis, [28]. Molecular dynamics simulations can also be considered among the fundamental studies, but they can be included also in the Tribology of Materials and in the Lubricants and Micro and Nanotribology branches, as well as all basic studies on different materials and lubricants up to the micro-nano level.…”

Section: Fundamental Tribologymentioning

confidence: 99%

Vastness of Tribology and its Contribution for a Sustainable Development

Ciulli

2024

Preprint

View full text Add to dashboard Cite

Tribology is related to all studies on friction, wear and lubrication. One of the main aims of these studies is a reduction in friction and wear. Tribology is extremely vast, being also multidisciplinary and interdisciplinary. Therefore, it is very difficult to organize the several tribology subjects in an unique way and different classifications have been proposed by different authors. In this work, the several subjects treated by tribology are reviewed and organized in six branches: Fundamental Tribology, Tribology of Materials and Lubricants, Micro and Nanotribology, Industrial Tribology, Biotribology and New Frontiers of Tribology. The main subjects treated by the six branches are briefly reviewed in the paper in order to highlight the vastness of tribology and its important contribution to sustainability. Particularly friction and wear reductions are strictly related to greater efficiency and material saving, which mean less energy losses and material wastes, less pollution and therefore a more sustainable life according to the Sustainable Development Goals. The connections among the latter and the several different tribological subjects are discussed.

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“…The radial stiffness of an RB or B&S pivot can be evaluated through classical Hertz theory if the contact is non-conformal [8]. However, Hertz's formulas are not reliable for quasi-conformal contacts, as observed experimentally in [9], and whenever Hertz's hypotheses are not satisfied and contact stiffness assessment is important, the latter should be evaluated more accurately [10]. Recently, Fang et al proposed a theory for the estimation of radial stiffness of quasi-conformal B&S contact [11].…”

Section: Introductionmentioning

confidence: 99%

Investigation on Pivot Rolling Motion Effect on the Behavior of Rocker Back Tilting Pad Journal Bearings

Betti

Forte

Panara³

et al. 2023

Applied Sciences

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The rolling motion of the pads with rocker back (RB) and ball and socket pivots is normally neglected in common software programs for the study of the rotor dynamic behavior of tilting pad journal bearings (TPJB). In other words, the theoretical contact point of the pivot is considered fixed. The aim of this work is to provide a novel way to implement in commercial software the effect of the variation of the circumferential coordinate of the theoretical contact point due to the pad rolling motion in RB TPJB. This is done by introducing an equivalent pivot rotational stiffness evaluated with an analytically derived formula, validated through finite element analysis. Such a stiffness is a function of the pad load and the radii of the contact pair, increasing with the load, the radii, and the degree of conformity of the contact. The static and dynamic characteristics of a five pad RB TPJB are then evaluated with a commercial software with and without the rotational stiffness contribution for two different pivot geometries. Non-negligible differences were found, particularly regarding the cross-coupled dynamic coefficients that show the higher sensitivity to the rotational stiffness. The inclusion of a pivot rotational stiffness among the data of commercial software for simulation of RB TPJB could contribute to fill the gap between numerical and experimental results.

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Tilting Pad Journal Bearing Ball and Socket Pivots: Experimental Determination of Stiffness

Cited by 10 publications

References 25 publications

Vastness of Tribology Research Fields and Their Contribution to Sustainable Development

Vastness of Tribology Research Fields and Their Contribution to Sustainable Development

Vastness of Tribology and its Contribution for a Sustainable Development

Investigation on Pivot Rolling Motion Effect on the Behavior of Rocker Back Tilting Pad Journal Bearings

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