Three-Dimensional Thermoelastic Solutions of Thrust Bearings Using Code Marmac1

Ettles, C. M. McC.; Anderson, HI

doi:10.1115/1.2920636

Cited by 39 publications

(21 citation statements)

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“…1). There have been several attempts to calculate the thermal deformation of the pads of those bearings, because such deformation affects the performance of bearing [1][2][3]. In these attempts, the temperature distribution in the pads is calculated first, and then, taking into account this distribution, calculated the thermal deformation of the pads.…”

Section: Introductionmentioning

confidence: 99%

Computation of Thermal Deformation of Thrust Bearing Pad Concerning the Convection by Non-Uniform Oil Flow

Hemmi

Hagiya

Ichisawa

et al. 2005

World Tribology Congress III, Volume 2

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Tilting-pad thrust bearings are used to support the loads of large rotating machinery, such as water turbine generators. When such machines are in operation, thermal deformation is so extensive that it is comparable to deformation caused by the pressure of the oil film, and it influences the bearing’s performance. So, the temperature distribution in the pad, which determines the thermal deformation, should be calculated correctly. This requires precise estimation of the convection by the ambient oil at the pad’s surfaces, but the complexity of the pad’s shape and ambient oil flow of oil around it makes this estimation difficult. Using CFD (Computational Fluid Dynamics) software, we computed the temperature distribution in the pad by solving the heat transfer in the pad, in the oil and interfaces of them simultaneously. The thermal and stress deformation were then calculated by the FEM code and is used in oil film analysis to determine the characteristics of the bearing. Comparing its results with the experimental ones validated the computational process.

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Section: Introductionmentioning

confidence: 99%

Computation of Thermal Deformation of Thrust Bearing Pad Concerning the Convection by Non-Uniform Oil Flow

Hemmi

Hagiya

Ichisawa

et al. 2005

World Tribology Congress III, Volume 2

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“…Most of these publications focus on thrust bearings. Ettles et al [9] develop a method to model heat transfer at the free pad surfaces considering rotational speed, oil viscosity and pad length. The calculation for this method is derived from temperature measurement data of seven different thrust bearings.…”

Section: Heat Transfer In Thrust Bearingsmentioning

confidence: 99%

Influence of Active Cooling at the Trailing Edge on the Thermal Behavior of a Tilting-Pad Journal Bearing

2021

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In tilting-pad journal bearings (TPJB) with a non-flooded lubrication concept, higher maximum pad temperatures occur than with a flooded bearing design due to the lower convective heat transfer at the pad edges. In this paper, we present an approach to influence the thermal behavior of a five-pad TPJB by active cooling. The aim of this research is to investigate the influence of additional oil supply grooves at the trailing edge of the two loaded pads on the maximum pad temperature of a large TPJB in non-flooded design. We carry out experimental and numerical investigations for a redesigned test bearing. Within the experimental analysis, the reduction in pad temperature is quantified. A simulation model of the bearing is synthesized with respect to the additional oil supply grooves. The simulation results are compared with the experimental data to derive heat transfer coefficients for the pad surfaces. The experimental results indicate a considerable reduction of the maximum pad temperatures. An overall lower temperature level is observed for the rear pad in circumferential direction (pad 4). The authors attribute this effect by a cooling oil carry-over from the previous pad (3). Within the model limits, a good agreement of the simulation and experimental results can be found.

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“…paper at the World Tribology Congress in London, United Kingdom, September 8- 12,1997 Final manuscript approved June 8,1998 The pivot arrangement is more commonly used in smaller bearings. As the size of the bearing increases, the higher loads and significant thermal influences caused by shear heating within the lubricant film resuit in pad deflections which can lead to reductions in the lubricant film thickness.…”

Section: Presented As a Society Of Tribologists And Lubrication Enginmentioning

confidence: 99%

Yuan

Medley

Ferguson³

1999

Tribology Transactions

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A test facility was developed for the experimerltal investigation ofthe large spring-supported thrust bearings used in hydroelectric getzercitors. The test bearing had an outer diameter of 1.168 m, ihus making it large enough to simulate most of the features of the tlzrcisl bearings in the field, yet small enough to be placed convetlierztly in a11 engineering laboratoty. It~strumentation included a distributiotl of thennocociples and pressure taps along wirh disl~lace~nenr probes of eddy current type that were located in rhe rntor to measure oil filtn thickness. A detailed description of rhe lest facility was provided alottg with some representative results crrrrl a descriptiot~ of sotne experimental d~ficulties. A survey of the ~.elevatzt literature published in the past 40 years suggested that rlzis apparatus was ~iniqcie it1 its ability to study relatively large spring-supporied thrust bearings in the laboratory.

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Three-Dimensional Thermoelastic Solutions of Thrust Bearings Using Code Marmac1

Cited by 39 publications

References 0 publications

Computation of Thermal Deformation of Thrust Bearing Pad Concerning the Convection by Non-Uniform Oil Flow

Computation of Thermal Deformation of Thrust Bearing Pad Concerning the Convection by Non-Uniform Oil Flow

Influence of Active Cooling at the Trailing Edge on the Thermal Behavior of a Tilting-Pad Journal Bearing

Spring-Supported Thrust Bearings Used in Hydroelectric Generators: Laboratory Test Facility©

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