Efficient Models of Three-Dimensional Tilting Pad Journal Bearings for the Study of the Interactions Between Rotor and Lubricant Supply Plant

Rindi, Andrea; Rossin, Stefano; Conti, Roberto; Frilli, Amedeo; Galardi, Emanuele; Meli, Enrico; Nocciolini, Daniele; Pugi, Luca

doi:10.1115/1.4030509

Cited by 14 publications

(9 citation statements)

References 21 publications

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“…It confirms partly simulation conclusions in the present study. In the further work, the acoustic performance of the compound textured bearing under the condition considering the bearing interaction with its coupled components will be studied. 33,34 …”

Section: Discussionmentioning

confidence: 99%

Influences of operation parameters on noise of journal bearing with compound texture considering lubricant thermal effect

Meng

Shu

Chen

2019

Proceedings of the Institution of Mechanical Engineers, Part J:

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Effects of operation parameters on the noise of the compound textured journal bearing are analyzed using computation fluid dynamic method and broadband noise source theory. After a three-dimensional model of the compound textured bearing is established, the lubrication performances of the bearing are compared under the isothermal and thermal situations. Further, the noise performances of the textured and smooth bearings are studied at the varied operation parameter. Numerical results show that appropriately decreasing the eccentricity ratio or rotational speed can reduce the noise of the compound textured bearing. Moreover, there is a critical length–diameter ratio of the bearing for suppressing the noise of the compound textured bearing. A part of the above conclusions is also verified experimentally.

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Section: Discussionmentioning

confidence: 99%

Influences of operation parameters on noise of journal bearing with compound texture considering lubricant thermal effect

Meng

Shu

Chen

2019

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…A more complex approach is proposed in [8], in which leaked mass flowrate is introduced. The calculation of the supply and leakage flows in the system is based on the sump and the duct models.…”

Section: Oil Mixing Modelmentioning

confidence: 99%

“…Thorat et al in [6] compared pad temperature measurements with predictions using a TEHD model by investigating the effects of manufacturing tolerances on bearing assembled clearance and preload. The state of art of thermal models for tilting-pad journal bearings is represented by the work of Suh and Palazzolo in [7], where they developed a full three-dimensional thermal model by including pad thermal deformation, shaft thermal expansion and pivot flexibility, and by the work of Rindi et al in [8], in which they improved the three-dimensional thermal model by including the model of the oil supply.…”

Section: Introductionmentioning

confidence: 99%

Cooled Pads for Tilting-Pad Journal Bearings

et al. 2019

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Tilting-pad journal bearings (TPJBs) are widely installed in rotating machines owing to their high stability, but some drawbacks can be noted, such as higher cost with respect to cylindrical journal bearings and thermal issues. High temperatures in the pads correspond to low oil-film thicknesses and large thermal deformations in the pads. Therefore, the restriction of the maximum temperature of the bearing is a key aspect for oil-film bearings. The temperature reduction is generally obtained by adopting higher oil inlet flowrates or suitable oil nozzles. In this paper, the idea of using cooled pads with internal channels in which an external cooling fluid is circulated will be applied to a TPJB for the first time. The three-dimensional TEHD model of the TPJB, equipped with a cooled pad, will be introduced, and the results of the numerical simulations will be discussed. Several analyses have been performed in order to investigate the influence of cooling conditions, such as the type, flowrate, inlet temperature and number of cooled pads. Two types of pad geometry with different cross-sections of the cooling circuit, namely, circular and six-square multi-channel sections, have been compared to the reference bearing with solid pads. Simple experimental tests were performed by means of a test rig equipped with a cooled pad bearing obtained with the additive manufacturing process, thus showing the effectiveness of the solution and the agreement with the predictions.

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“…Rindi et al. 9,10 discussed efficient models of three-dimensional tilting pad journal bearings for turbomachinery applications. Litwin and Dymarski 11 studied water-lubricated marine stern tube bearings in conditions of improper, insufficient lubrication through experimental research.…”

Section: Introductionmentioning

confidence: 99%

“…Monmousseau and Fillon 8 investigated transient thermoelastohydrodynamic performance for safe operating conditions of a tilting-pad journal bearing. Rindi et al 9,10 discussed efficient models of threedimensional tilting pad journal bearings for turbomachinery applications. Litwin and Dymarski 11 studied water-lubricated marine stern tube bearings in conditions of improper, insufficient lubrication through experimental research.…”

Section: Introductionmentioning

confidence: 99%

Effects on lubrication characteristics of water-lubricated rubber bearings with journal tilting and surface roughness

2019

Proceedings of the Institution of Mechanical Engineers, Part J:

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To study the effect of surface roughness on the lubrication characteristics of water-lubricated rubber bearings (WLRBs) when the stern shaft is tilted, the surface roughness of the bearings was measured by a surface roughness measuring instrument. Considering the tilting stern shaft and surface roughness, a mathematical model was constructed and water film thickness equation was deduced. By adopting the finite difference method, the film thickness and pressure distribution of WLRBs with tilt angle and roughness were analysed. The effects of tilt angle on film thickness and pressure under different surface roughness amplitudes and wavelengths were studied, and the results were then compared with those of smooth surface bearings without tilt angle. Finally, the minimum film thickness and maximum film pressure were analysed. The results showed that when the tilt of rotor and surface roughness of bearing were considered simultaneously, the film thickness exhibited a jagged distribution in the circumferential direction and decreased gradually in the axial direction. The film pressure had slightly irregular fluctuations and a sharp pressure peak. The tilt angle and roughness reduced the minimum film thickness, and the film thickness difference increased. The film pressure increased rapidly and local pressure exhibited slight, sudden changes. The surface roughness amplitude and wavelength had a considerable influence on the water film thickness, and the roughness amplitude had a clear effect on the film pressure. As the roughness amplitude increased, the minimum film thickness gradually declined and film pressure peak fluctuation grew. As the roughness wavelength increased, the film thickness fluctuated irregularly within a certain range of magnitude, and the minimum film thickness was almost constant.

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Efficient Models of Three-Dimensional Tilting Pad Journal Bearings for the Study of the Interactions Between Rotor and Lubricant Supply Plant

Cited by 14 publications

References 21 publications

Influences of operation parameters on noise of journal bearing with compound texture considering lubricant thermal effect

Influences of operation parameters on noise of journal bearing with compound texture considering lubricant thermal effect

Cooled Pads for Tilting-Pad Journal Bearings

Effects on lubrication characteristics of water-lubricated rubber bearings with journal tilting and surface roughness

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