Effect of the load direction on non-nominal five-pad tilting-pad journal bearings

Dang, Phuoc Vinh; Chatterton, Steven; Pennacchi, Paolo; Vania, A.

doi:10.1016/j.triboint.2016.02.028

Cited by 61 publications

(43 citation statements)

References 28 publications

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“…For the sake of brevity, only the direct terms of stiffness (K xx and K yy ) and damping (C xx and C yy ) coefficients are reported in Table 6. The method used for the estimation of the dynamic coefficients is based on the reduction of the full set of dynamic coefficients as already described by the authors in in [22]. The main results of all the simulations are listed in Table 6, including: the mean (T mean oil-film #1) and the maximum (T max oil-film #1) temperatures of the oil film d #1; the maximum temperature among all the oil-films (T max among all oil-films); the temperature in correspondence of the tip of the temperature probe of the pad #1 (T probe #1) that roughly corresponds to the centre of the pad, as shown in Figure 1b,c and Figure 15; the maximum pressure on oil-film of pad #1 which is the highest loaded pad (P max oil-film #1); the minimum oil-film thickness on oil-film of pad #1 (Thick.…”

Section: Simulation Results and Discussionmentioning

confidence: 99%

“…For the sake of brevity, only the direct terms of stiffness (Kxx and Kyy) damping (Cxx and Cyy) coefficients are reported in Table 6. The method used for the estimation of ynamic coefficients is based on the reduction of the full set of dynamic coefficients as already ribed by the authors in in [22]. The maximum temperature in the oil-film of pad #1 is always lower than the maximum temperature among all the oil-films, highlighting the cooling effect of the proposed solution.…”

Section: Simulation Results and Discussionmentioning

confidence: 99%

“…The TEHD model of the TPJB bearing is similar to that developed and described by the same authors in [22,23] and improved with respect to the thermal aspect, as partially undertaken in [24] for sleeve journal bearings. The model primarily includes the laws of hydrodynamic lubrication, the three-dimensional thermal model of the oil-films, pads and shaft and the flexibility of the pivots.…”

Section: Bearing Modelmentioning

confidence: 99%

“…Simple experimental tests were performed by means of the test rig of the Department of Mechanical Engineering of Politecnico di Milano widely described in [22] and [29]. Some pictures of the experimental setup are shown in Figure 23.…”

Section: Experimental Testsmentioning

confidence: 99%

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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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Section: Simulation Results and Discussionmentioning

confidence: 99%

Section: Simulation Results and Discussionmentioning

confidence: 99%

Section: Bearing Modelmentioning

confidence: 99%

Section: Experimental Testsmentioning

confidence: 99%

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Cooled Pads for Tilting-Pad Journal Bearings

et al. 2019

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“…The next publication [7] shows that by changing operating parameters of the rotating system or the measuring method the authors obtained different values of the bearing dynamic coefficients.…”

Section: Introductionmentioning

confidence: 99%