AMESim液阻库仿真建模---lib_hydraulic_resistance

LMSImagine.LabAMESimHydraulicResistanceLibraryRev12User’sguideHowtocontactLMSImagine.Lab:®User’sGuides©CopyrightLMSImagineS.A.1995-2013Thesoftwaredescribedinthisdocumentationisfurnishedunderalicenseagreement.Thesoftwaremaybeusedorcopiedonlyunderthetermsofthelicenseagreement.Nopartofthismanualmaybephoto-copiedorreproducedinanyformwithoutpriorwrittenconsentfromLMSImagineS.A.TrademarksAMESim®isaregisteredtrademarkofLMSImagineS.A.AMESet®isaregisteredtrademarkofLMSImagineS.A.AMERun®isaregisteredtrademarkofLMSImagineS.A.AMECustom®isaregisteredtrademarkofLMSImagineS.A.LMSImagine.Lab®isaregisteredtrademarkofLMSInternationalN.V.LMSVirtual.LabMotion®isaregisteredtrademarkofLMSInternationalN.V.SysDM®isaregisteredtrademarkofLMSInternationalN.V.SystemSynthesis®isaregisteredtrademarkofLMSInternationalN.V.Otherproductorbrandnamesaretrademarksorregisteredtrademarksoftheirrespectiveholders.MMaarrcchh22001133TTaabblleeooffccoonntteennttss11//11TABLEOFCONTENTS1.Introduction..............................................................................................................................12.GettingstartedwiththeHydraulicResistanceLibrary.........................................................13.PressuresusedinAMESim...................................................................................................103.1.AMESim®standardcomponents.......................................................................................103.2.NotionofrelativeandabsolutepressuresinAMESim.......................................................103.3.HydraulicResistanceLibrarycomponents........................................................................114.ModelinganetworkwithHydraulicResistancecomponents:importantrules................125.Tutorialexample.....................................................................................................................136.Formulationofequationsandunderlyingassumptions.....................................................196.1.Basicequations.................................................................................................................196.2.Furtherassumptions..........................................................................................................207.Reynoldsnumber...................................................................................................................218.HydraulicResistancesubmodels:classification................................................................238.1.Frictionaldragcategory.....................................................................................................238.2.Localresistancecategory..................................................................................................268.3.Frictionalandlocalresistancecategory............................................................................268.4.Plainjournalbearingcategory...........................................................................................279.Causalityinthehydraulicresistancelibrary.......................................................................3410.Theconnectors:steadystateandquasi-steadystateproblems.....................................3511.References............................................................................................................................3612.APPENDIXA.........................................................................................................................3713.APPENDIXB.........................................................................................................................44MMaarrcchh22001133HHyyddrraauulliiccRReessiissttaanncceeLLiibbrraarryy11//44441.IntroductionFlowresistancehasastronginfluenceonthedesignoffluidpowercircuitsinwhichpressuresarerelativelylowbutflowratesarehigh.ThisisthereasonforthecreationoftheAMESim®HydraulicResistanceLibrary.Thislibrarycomprisesasetofcomponentsfromwhichitiseasytomodellargehydraulicnetworks,evaluatepressuredropsthroughtheelementsand,ifrequired,modifythedesignofthesystem.Fluidsaremovedbyadifferenceofpressure.Resistancetoflowcanbecharacterizedbyfriction(regularpressuredrops)andchangesinstreamdirectionorvelocity(singularpressuredrops).PressuredropsineachhydraulicresistancelibrarycomponentareevaluatedbasedontheIdel'cik[1]formulaeandexperimentdata.Beforesummarizingtheparticularcharacteristicsofthislibrary,wepresentasmalltutorialexample.Next,rulesandadvicearegivenonhowtotakeadvantageofthepossibilitiesofferedbythehydraulicresistancelibrary.Anadditionaltutorialexampleispresented.Thiswillintroducesomeconceptswhichwillleadtoabriefdescriptionofthebackgroundtheory.Finallyaclassificationofthesubmodelsisgivenfollowedbysomemoregeneralinformation.Itisassume