| 1. |
- Glavatskih, Sergei, et al.
(author)
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TEHD analysis of thrust bearings with PTFE-faced pads
- 2004
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In: Proceedings of the ASME/STLE Joint International Tribology Conference - 2004. - New York. - 0791841812 ; , s. 603-613
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Conference paper (peer-reviewed)abstract
- Results of a combined theoretical and experimental investigation into the operation of thrust bearings with PTFE-faced pads are reported. Bearing performance is analysed in terms of temperature, power loss, oil film thickness and pressure. These parameters are first calculated using a THD model. The effect of PTFE facing on bearing thermal performance is then presented and discussed. A TEHD model is subsequently employed. Obtained TEHD results show that oil film thickness and temperature are strongly affected by the PTFE layer. Theoretical results are compared with measured temperature, oil film thickness and pressure.
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| 2. |
- Sahlin, Fredrik, et al.
(author)
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2D CFD-analysis of micro-patterned surfaces in hydrodynamic lubrication
- 2004
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In: Proceedings of the ASME/STLE international joint tribology conference 2004. - New York. ; , s. 1637-1645, s. 1637-1645
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Conference paper (peer-reviewed)abstract
- Results of a numerical study of the influence of micro-patterned surfaces in hydrodynamic lubrication of two parallel walls are reported. Two types of parameterized grooves with the same order of depth as the film thickness are used on one stationary wall. The other wall is smooth and is sliding with a specified tangential velocity. Isothermal incompressible two dimensional full film fluid flow mechanics is solved using a Computational Fluid Dynamics method. It is shown that, by introducing a micro-pattern on one of two parallel walls, a net pressure rise in the fluid domain is achieved. This produces a load carrying capacity on the walls which is mainly contributed by fluid inertia. The load carrying capacity increases with Reynolds number. The load carrying capacity is reported to increase with groove width and depth. However, at a certain depth a vortex appears in the groove and near this value the maximum load carrying capacity is achieved. It is shown that the friction force decreases with deeper and wider grooves. Among all geometries studied, optimum geometry shapes in terms of hydrodynamic performance are reported.
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| 3. |
- Ukonsaari, Jan, et al.
(author)
-
Tribological studies on oscillating bronze bearings lubricated with environmentally adapted lubricants (EALs)
- 2004
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In: ASME/STLE 2004 International Joint Tribology Conference 2004. - New York : American Society of Mechanical Engineers. - 0791841812 ; , s. 387-394
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Conference paper (peer-reviewed)abstract
- Different compositions of bronze materials are used for sliding bearings in various applications including those involving oscillatory motion and moderate temperatures. The compatibility of new environmentally adapted synthetic esters with different contacting surface materials is important to ensure good tribological performance. The present work deals with tribological studies on oscillatory journal bearings manufactured with three different compositions of bronze materials lubricated with EALs under boundary lubricated conditions. Under certain operating conditions, dissolution of alloying constituents from the bronze bearing material dissolute into the synthetic ester lubricant occur leading to the formation of a copper enriched bearing surface layer. Tin-bronze with synthetic ester lubricant showed more stable friction values and roughly ten times better wear results than the harder aluminium- and manganese-bronze and also outperformed the mineral oil under the same conditions.
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