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Optimization of a leading edge groove tilting pad journal bearing for application in a small, high speed, multistage steam turbine is described. Rotordynamics constraints to meet a design objective maximum operating speed of 18000 rpm resulted in a rotor with a 51.0 in bearing span and 5.0...

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The trend towards higher speed for increased aerodynamic performance of turbomachinery has aroused much interest in the subject of bearing influenced rotordynamics. A major contribution to this was the development of the variable geometry tilting pad journal bearing. The inherent stability...

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Optimization of a leading edge groove tilting pad journal bearing for application in a small, high speed, multi-stage steam turbine is described. Rotordynamics constraints to meet a design objective maximum operating speed of 18,000 rpm resulted in a rotor with a 5 1. 0 in. bearing span and 5. 0...

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...flatlines. A typical sintered journal bearing develops cracks when subjected to repeated impact loading. Many engineers consider external lubrication systems for journal bearings a necessary evil. The approach adds design complexity and another item to be routinely serviced. Not to mention, liquid...

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Impact loading is a significant concern when specifying a journal bearing. There are applications that present difficulties for composite or bronze bearing materials. For applications where impact is a known design limitation, there are a few considerations to be made when specifying a journal...

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...very slowly. Wear occurs during start-up and slowdown when speed is too low to produce sufficient fluid pressure to support the bearing surfaces on a lubricant film. If hard debris imbeds in a babbitt or plastic bearing and protrudes above the bearing surface, the journal can wear seriously during...

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TECHNOLOGIES USED: Oil Analysis. Opened bearing showing the poor condition of the lubricant, sludge build up on non-contact surfaces, thrust bearing groves nearly filled in with sludge. Journals and thrust plate surfaces in good condition. In September 05, Dodge SleeveOil bearings were installed...

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Numerous oil and grease-lubricated bearing designs rely on adequate lubricant film thickness for smooth and trouble-free operation. Engineers must check that films are sufficiently thick so asperities peaks of surface roughness between mating surfaces don't touch. Dow Chemical Endowed Chair...

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...as a result of the wear surface degrading or the engineered backing material going through a gradual reduction in mechanical or physical properties. The calculation of PV can vary slightly depending on the type of bearing being evaluated (journal bearing, thrust washer, flanged bearing or linear...

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High-operating temperature can spell trouble for journal bearings. Here are some ways to avoid it. Director, Center for Rotating Machinery Plastic flow at 305 F in a 16-in.-diameter babbitt journal bearing. Journal bearings that overheat signal-a problem with lubrication, misalignment...

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