A Computational Approach for Mixed-Lubrication Effects in Sealing Applications.pdf

《A Computational Approach for Mixed-Lubrication Effects in Sealing Applications.pdf》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、Chapter18AComputationalApproachforMixed-LubricationEffectsinSealingApplicationsMarkusAndr´eProfessorWriggersintroducedmetothesecretsofsolidandcomputationalme-chanics.IenjoyedtoworktogetherwithhimattheUniversitiesofDarmstadtandHanoverandIstillprofitfrom

2、theachievedknowledge.Ithankhimforthecontinu-oussupportandwishhimahappybirthday!(M.Andr´e).Abstract.Frictionandwearofdynamicsealsinhydraulicsystemsarestronglyin-fluencedbythelubricationstatebetweenthesurfacesofthesealingstructureandthemovingpiston.Theco

3、ntactandlubricationstateisaresultofthecouplingbe-tweenthedeformablesealstructureandhydrodynamiceffectsinthelubricatingfluidfilm.Thispaperpresentsanefficientcomputationalmethodforthedetermina-tionofmixed-lubricationstatesinsuchcontactregions.Astandardfinit

4、eelementmodelisusedinordertocomputethedeformationofthesealstructure,whilesi-multaneouslyauser-definedinterfaceelementsolvestheReynoldsequationthatdescribesthefluidfilm.Inthiswayanimplicitandnumericallystablecouplingbetweenthesolidandthefluidregionisachiev

5、ed.1IntroductionInhydrauliccylindersystemstherodsealshavetoprovideareliablesealingfunc-tionatminimalfrictionandwearevenathighfluidpressureandhighrodvelocities.Theserequirementsareusuallyachievedthroughasufficienthydrodynamiclubri-cationwithinthesealingc

6、ontact.Asuitabledesignofthesealingshapeisnecessarytogeneratesuchafluidfilm.Theindustrialstandardistoestimatethehydrody-namicfluidfilmfromtheinversehydrodynamiclubrication(IHL)theory[2],[6],wherethefluidfilmthicknessiscomputedfromtheinversesolutionofthestead

7、y-stateReynoldsequation.InsuchapproachesthecontactpressureisconsideredtoMarkusAndr´eRobertBoschGmbH,Waiblingene-mail:markus.andre@de.bosch.com156M.Andr´ebeknown,e.g.fromasolidmechanicscomputation,andafulllubricationstateisassumed.Lateron,theinversemet

8、hodshavebeenextendedtoelasto-hydrodynamiclubricationtheories[5],[3],inwhichtheelasticdeformationofthesolidstructureisconsideredandiscoupledtothefluidfilmthickness.Nevertheless,almostallap-proachesassumelinear-elasticbehaviour.Recentlysomeworksha