Measured Performance of Tilting-Pad Journal Bearings over a Range of Preloads—Part I: Static Operating Conditions

Wygant, Karl; Flack, Ronald D.; Barrett, Lloyd

doi:10.1080/05698190490504154

Cited by 16 publications

(6 citation statements)

References 16 publications

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“…The global parameters of the bearing are obtained by Equation 18 to Equation 22 and shown in Figure 9, which include attitude angle, load capacity, and friction torque. Bearing attitude angle maintains small values from -10º to 10º with the variation of load direction, which is consistent with the experimental results from the references (Wygant et al, 2004;Jones and Marin, 1979). This can be attributed to the actively swinging characteristics of the pads.…”

Section: Response Of Global Parameters To Load Directionsupporting

confidence: 80%

“…DeCamillo compared the oil temperature profiles between the two configurations (Decamillo and Brockwell, 2001). For both structures, Wygant measured the oil film thickness and attitude angles with different preload ratios (Wygant, 2004). Jones showed the effect of load direction on the steady state behavior, especially on the minimal oil film thickness from one "between pad" position to another (Jones and Martin, 1979).…”

Section: Introductionmentioning

confidence: 99%

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Numerical study on the load direction effect on the performance of tilting pad-journal gas bearing

Lai

Hou

Niu

et al. 2014

JAMDSM

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This paper quantitatively presents the effect of load directions on the static performance of gas titling pad-journal bearing (TPJB). The gas film thickness is determined in a subsystem composed of the rotor and one pad. Based on pressure distributions obtained from Reynolds equations, integration method is used to predict the bearing static performance. Pad forces and moment balances are considered in calculating the swing angles. Local and global parameters with different load directions are discussed analytically. With the variation of load direction, the global parameters of the bearing keep relatively stable, while the local parameters can make active changes.

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Section: Response Of Global Parameters To Load Directionsupporting

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Numerical study on the load direction effect on the performance of tilting pad-journal gas bearing

Lai

Hou

Niu

et al. 2014

JAMDSM

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show abstract

“…The effects of the preload factor and clearance ratio on the performance of the TPJB were also investigated in literature. 3–8…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of the effect of manufacturing errors in pads on the behaviour of tilting-pad journal bearings

Dang

Chatterton

Pennacchi

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part J:

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In this study, the effect of the manufacturing tolerances of the pad thickness or the assembly errors on the characteristics of a five-pad tilting-pad journal bearing is analysed. In fact, the pad thickness errors correspond to a different preload factor or clearance for each pad. A sensitivity analysis was performed for several combinations of pad thickness for both load-on-pad and load-between-pad configurations using a thermo-elasto-hydro-dynamic model. Three cases of thickness variations were studied. The numerical results show that these manufacturing or assembly errors considerably affect on both the static and dynamic behaviours of the bearing.

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“…Observed transient trends in the slow variables appeared as expected though some unexpected behaviors ascribed to the transition from laminar to turbulent lubrication regime were detected. Concerning the dynamic force coefficients an isotropic behavior for both stiffness and damping was expected due to the load between pad configuration and the even number of pads (4). The observed non-isotropic behavior was ascribed to the static loader stiffness and it is still under investigation.…”

Section: Discussionmentioning

confidence: 99%

Characterization of High-Power Turbomachinery Tilting Pad Journal Bearings: First Results Obtained on a Novel Test Bench

Ciulli

Forte

Libraschi³

et al. 2018

Lubricants

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Tilting pad journal bearings are usually employed in turbomachines for their stable behavior at high rotational speeds. Devoted test rigs have been realized to validate the predictions of theoretical models. However, the design of new high-performance and large-size bearings needs to be supported by experimental investigations on high-performance large test rigs. The main characteristics of a recently built facility for testing large tilting pad journal bearings with diameters from 150 to 300 mm are described in this work. The test rig is versatile and can be used to test bearings of different size, configurations and to investigate the influence of many parameters, even the effect of misalignment. Sample results of the static characterization of a four-pad high-performance tilting pad journal bearing are reported evidencing some transient effects. A few sample dynamic results are also reported. The presented experimental results demonstrated the capabilities of the rig for investigating the static and the dynamic characteristics of the bearings accurately measuring slow and fast variables.

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Measured Performance of Tilting-Pad Journal Bearings over a Range of Preloads—Part I: Static Operating Conditions

Cited by 16 publications

References 16 publications

Numerical study on the load direction effect on the performance of tilting pad-journal gas bearing

Numerical study on the load direction effect on the performance of tilting pad-journal gas bearing

Numerical investigation of the effect of manufacturing errors in pads on the behaviour of tilting-pad journal bearings

Characterization of High-Power Turbomachinery Tilting Pad Journal Bearings: First Results Obtained on a Novel Test Bench

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