Abstract: Hydrodynamic lubrication theory based on viscous fluid mechanics has greatly devel-oped the tribology theory. However, because the mechanical equipment is developed with muchhigher speed and larger scale in recent years, lubrication failure occurs frequently. In electric gen-erator sets and mill trains, accidents caused by lubrication failure cost great lost. According tostatistics of the former Soviet Unions, 60 percent of the accidents in hydroelectric generator setsare caused by lubrication failure. The ...