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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    Abstract

    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
    Pages162-167
    Publication statusPublished - 2007
    EventBALTTRIB' 2007: International Tribology Conference - Lithuanian University of Agriculture, Kaunas, Lithuania
    Duration: 21 Nov 200723 Nov 2007

    Conference

    ConferenceBALTTRIB' 2007: International Tribology Conference
    LocationLithuanian University of Agriculture
    Country/TerritoryLithuania
    CityKaunas
    Period21/11/200723/11/2007

    Keywords

    • Piston Ring
    • Oil Film Thickness

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