Calculation of Oil Film Thickness from Damping Coefficients for a Piston Ring in an Internal Combustion Engine

Jens Christiansen, Peder Klit, Anders Vølund, Jong Hyun-Hwang

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In 1966 Jorgen W. Lund published an approach to find the dynamic coefficients of a journal bearing by a first order perturbation of the Reynold's equation. These coefficients made it possible to perform a rotor-bearing stability analysis for a statically loaded bearing. In the mid seventies Jorgen W. Lund pointed out in lecture notes that the dynamic damping coefficients of the bearing could be used to find the shaft orbit for dynamically loaded bearings. In the present paper this method is further developed and utilized to determine the dynamic behavior of a piston ring in a combustion engine. The basic idea is to use the fluid film damping coefficients to estimate the film thickness variation for a piston ring under cyclic varying load. Reynolds Equation is solved for a piston ring and the oil film thickness is determined. In this analysis hydrodynamic lubrication is assumed and the effect of the squeeze motion is considered.
Original languageEnglish
Title of host publicationBaltTrib'2007
Place of PublicationKaunas, Lithuania
PublisherLithuanian University of Agriculture
Publication date2007
Publication statusPublished - 2007
EventBaltTrib'2007 : International Conference in Tribology - Lithuanian University of Agriculture,Kaunas, Lithuania
Duration: 1 Jan 2007 → …


ConferenceBaltTrib'2007 : International Conference in Tribology
CityLithuanian University of Agriculture,Kaunas, Lithuania
Period01/01/2007 → …


  • Piston Ring
  • Oil Film Thickness


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