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	Lubrificazione Elastoidrodinamica	Accumulo di Tolleranze
Campo	Produzione industriale	Produzione industriale
Famiglia	Process / pipeline	Process / pipeline
Anno di origine	1977	2006
Ideatore	Dowson, D., Higginson, G. R.	Drake, P. J.
Tipo	Mathematical model for lubricated contacts	Method for analyzing tolerance accumulation in assemblies
Fonte seminale	Dowson, D., & Higginson, G. R. (1977). Elastohydrodynamic Lubrication: The Fundamentals of Roller and Gear Lubrication. Pergamon Press. ISBN: 0-08-021710-4	Drake, P. J. (2006). Dimensioning and Tolerancing Handbook (2nd ed.). McGraw-Hill. ISBN: 0-07-145215-8
Alias	EHL, Elastohydrodynamic film, Hydrodynamic lubrication	Stack-up analysis, Tolerance accumulation, Geometric tolerance
Correlati	4	4
Sintesi	Elastohydrodynamic lubrication (EHL) is the regime of fluid film lubrication in which elastic deformation of the surfaces plays a crucial role in maintaining a fluid layer between sliding or rolling surfaces. In applications like roller bearings and gears, the contact pressure is extremely high, causing the lubricant viscosity to increase dramatically and the surfaces to deform elastically. EHL theory, developed rigorously by Dowson and Higginson, predicts the film thickness, pressure distribution, and friction in these heavily loaded contacts.	Tolerance stack-up analysis is a method for predicting the cumulative effect of manufacturing tolerances on the final dimensions and fit of assembled components. When parts with individual tolerances are assembled together, their tolerances combine in complex ways, often producing a result that is worse than each part individually. Stack-up analysis ensures that the final assembly will function correctly despite individual part tolerances, or identifies where tighter tolerances are necessary.