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The reference speed for a given bearing represents the permissible operating speed of said bearing when subjected to the specific operating conditions of load lubrication type and method as outlined in ISO 15312 This standard has been established for oil lubrication but is also valid for grease and uses the fol-lowing reference conditions:

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Oil whirl is probably the most common cause of subsynchronous instability in hydrodynamic journal bearings Typically the oil film itself flows around the journal to lubricate and cool the bearing This develops an average speed slightly less than 50 percent of the journal surface speed (Figure 1