Effect of Thermal Boundary Condition on Tilting Pad Journal Bearing Behavior

Suh, Junho; Kim, Changwon; Han, Je‐Heon

doi:10.3390/app10217540

Cited by 4 publications

(4 citation statements)

References 35 publications

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“…It can be seen that the performance difference between the smooth bearing and the bearing with composite texture is more obvious when thermal effects are considered. As Figures [13][14][15][16][17][18][19][20][21][22] show that, the carry capacity of composite textured bearing is increased by about 40%-50% compared to smooth bearing, and the friction coefficient of composite textured bearing can be reduced to about 25% of the smooth bearing. Take the optimal values in each figure to obtain the increase rate of carry capacity and the decrease rate of friction coefficient as shown in Table 3.…”

Section: Resultsmentioning

confidence: 99%

“…It is concluded that ceramic bearing can improve working temperature of bearing. Suh et al 14 obtained the influence law of different thermal boundary conditions and lubricants on the performance of journal bearings. Zhao et al 15 solved the generalised Reynolds equation and calculated bearing deformation under action of oil film pressure and heat by the compliance matrix method.…”

Section: Introductionmentioning

confidence: 99%

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Coupling effect of partial composite texture and thermal effect on the performance of hydrostatic bearing

Chen,

Cui,

Sun

et al. 2024

Lubrication Science

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This work is focused on performance computation of high speed rotor bearing system with partial composite texture. Since its viscosity at varying speeds affects working performance in different partial composite texture, therefore at design and development stage, it is necessary to know the composite texture and thermal effect acting on rotor‐bearing system that causes variation of performance. The effects of partial composite texture size and position on the performance of the bearing are studied. After the optimal structural parameters are determined, the effects of the partial composite texture and fluid thermos structure coupling on the bearing capacity, stiffness, and friction coefficient of the oil film are analysed. The results show that after considering the influence of thermal effect, the performance enhancement of composite texture bearing is better than that of smooth bearing. Considering the temperature effect, the bearing capacity of the composite textured bearing is increased by 51.4% compared with that of the smooth bearing, and the friction coefficient is reduced to 22.4%, which is better than the value without considering the temperature effect, the accuracy of the results is verified by experiments. This study provides a theoretical basis for the design of hydrostatic bearing and improving its performance.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Coupling effect of partial composite texture and thermal effect on the performance of hydrostatic bearing

Chen,

Cui,

Sun

et al. 2024

Lubrication Science

View full text Add to dashboard Cite

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“…However, the use of synchronous coefficients tends to overestimate stability, especially in the case of a high Sommerfeld number [13] so the sub-synchronous dynamic coefficients are quite important. Suh studied the effects of thermal boundary condition on the stiffness and damping coefficients for tilting pad bearings [14]. Experimental studies of tilting pad bearings also indicated the frequency dependence of dynamic coefficients [15].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Coefficients of Tilting Pad Bearing by Perturbing the Turbulence Model

Han

Chen

et al. 2022

Applied Sciences

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Tilting pad bearings are appropriate for the trend of high efficiency and reliability design of rotating machinery due to their high stability. The laminar and turbulent flow states exist in the lubricating oil film of high-speed and heavy-load tilting pad bearings simultaneously. By perturbing the multiple flow state lubrication model with a partial derivative method, together with the pad-pivot structural perturbations, the frequency-dependent stiffness and damping coefficients of tilting pad bearings, embracing the effect of dynamical variations of both turbulence and pressure-viscous, were numerically solved in this research. The importance of each perturbed variable was studied, and the results indicate that the perturbed film thickness included in turbulence coefficients perturbations is significant enough to be taken into account otherwise the equivalent stiffness coefficients will be obviously overestimated. Unlike the perturbed film thickness, the consideration of the perturbed viscosity is optional, because it makes the stiffness and damping coefficients larger at both laminar and turbulent flow states. For a simplified simulation and conservative prediction results, the perturbed viscosity can be neglected.

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“…Chatterton et al [39] predicted the performance of the tilting pad journal bearing when the pad cooled by various methods and compared it with the experimental results. Suh et al [40] predicted the change of static and dynamic characteristics under various temperature boundary conditions around the tilting pad journal bearing.…”

Section: Introductionmentioning

confidence: 99%

Thermal Preload for Predicting Performance Change Due to Pad Thermal Deformation of Tilting Pad Journal Bearing

Chun

Lee

et al. 2022

Lubricants

Self Cite

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Thermal deformation of journal bearings operating under high-temperature conditions can have a significant effect on changes in bearing performance. However, no attempt has been made to quantify this amount of thermal deformation and link it to the performance change of the bearing. The aim of this study is to investigate the quantitative performance change due to thermal deformation of the tilting pad journal bearing (TPJB) pad in terms of the change in preload amount. The variable viscosity Reynolds equation and the energy equation were coupled using the relationship between viscosity and temperature, and the solution was obtained using the finite element method. Heat transfer between the spinning journal, oil film and pads is considered, and a three-dimensional (3D) finite element (FE) model was used to calculate the thermal deformation of the bearing structure. The steady state of the rotor-bearing system was predicted using a bearing performance prediction algorithm with three closed loops. State variables for this steady-state prediction include the amount of thermal deformation of the structure. In order to investigate the amount of thermal deformation of the bearing pad in terms of bearing performance, the concepts of thermal offset preload and thermal performance preload were suggested and the change in thermal preload under various conditions was investigated.

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Effect of Thermal Boundary Condition on Tilting Pad Journal Bearing Behavior

Cited by 4 publications

References 35 publications

Coupling effect of partial composite texture and thermal effect on the performance of hydrostatic bearing

Coupling effect of partial composite texture and thermal effect on the performance of hydrostatic bearing

Dynamic Coefficients of Tilting Pad Bearing by Perturbing the Turbulence Model

Thermal Preload for Predicting Performance Change Due to Pad Thermal Deformation of Tilting Pad Journal Bearing

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