弹性箔片动压径向气体轴承动特性的实验研究

264Vol26,No420067TRIBOLOGYJuly,20061,2,1,1,1(1.,710049;2.,730070):,60N9000r/min,,8,.:;;,;,,,.:;;;;:TH133.35:A:100420595(2006)0420353205,,1953Blok[1],1994Hayashi[2],Heshmat[3],.,,2,[47].,,.[8,9],,.[10,11],(FFT)8,,,[12].,,,,[12,13]8.11.11.,,,,.5InconelX750,,..,.,,.,,,,,.,.:(50275116,50475088);863(2002AA503020).:2005207222;:2005209229/,e2mail:[e-mail]:,,1948,,,2.Fig1Structureoffoiljournalairbearing150mm,1.2,0.18mm0.08mm,5.,DLC(),,,,.1.2,2.,.,72000r/min,,.Fig2Schematicofjournalairbearingtestrig2,,012000r/min.(30#).,.,.,2HEV250(3),245,.1.3.48V/mm,Fig3Sketchdiagramofexciterandsensorsposition32,290,45326.E3S2CL,11.CL2YB261,1,110mm.2BLR212B.,,,.86416,LABVIEW.29000r/min(150Hz),60N,228N,(50250Hz)6400Hz.8.,.,,12,,,.,.450250Hz.,,;Fig4Centerorbitsofbearingandmaximalvibrationamplitudeatdifferentexcitingfrequency45534:,[11,12,14].5.,Fig5Dimensionallinearstiffnessanddampingatdifferentexcitingfrequency5.5(a)kxxkyy,kxykyx,.,(y)kyy(x)kxx.5(b),,,dxxdyy,,0,,,dyydxx,dyy.[10,11].45,,,.(150Hz),,,[4(e)],,.,,,,,.3a.,,.b..,,,..c.,,.:[1]BlokH,VanRossumJJ.Thefoilbearinganewdepartureinhydrodynamiclubrication[J].ASLEJournalofLubricationEngi2neering,1953,9:3162330.[2]HayashiK.Developmentofaerodynamicsfoilbearingsforhigh2speedrotor[J].21thLeeds2LyonSymposiumTribology,1994.[3]HeshmatH,ShapiroW,GrayS.Developmentoffoiljournalbear2ingsforhighloadcapacityandhighspeedwhirlstability[J].TransactionofASMEJournalofLubricationTechnology,1982,104:1492156.[4],,,.[J].,1999,4:2312235.HouY,XiongLY,WangJ,etal.Experimentalstudyofthenewself2actingjournalgasbearingforcryogenicturbo2expander[J].CyrogenicEngineering,1999,4:2312235.[5]HeshmatH.Afeasibilitystudyontheuseoffoilbearingsincryo2genicturbopumps[J].AIAAPaperNo.9122103,The27thAIAA/SAE/ASMEJointPropulsionConference,Sacremento,CA,1991.[6]HeshmatH,HermelP.Compliantfoilbearingtechnologyandtheirapplicationtohighspeedturbomachinery[J].19thLeeds2LyonSymposiumonTribology,ThinFilmsinTribology,Leeds,65326UK,1992.[7],,.[J].,2005,48(4):4142429.YuL,QiSM,GengHP.Ageneralsolutionofelasto2aerodynamiclubricationforaerodynamiccompliantfoilbearings[J].ScienceinChina,Ser.EofEngineeringandMaterialScience,2005,48(4):4142429.[8]LundJW.Calculationofstiffnessanddampingpropertiesofgasbearings[J].TransactionofASMEJournalofLubricationTechnol2ogy,1968,10:7932803.[9]CzolczynskiK.Howtoobtainstiffnessanddampingcoefficientsofgasbearings[J].Wear,1996,201:2652275.[10]HeshmatH,RogerKuCP.Structuraldampingofself2actingcompliantfoiljournalbearings[J].TransactionofASMEJournalofTribology,1994,116:76282.[11]Yang2BokLee,Tae2HoKim,Nam2SooLee,etal.Dynamiccharacteristicsofaflexiblerotorsystemsupportedbyaviscoelas2ticfoilbearing(VEFB)[J].TribologyInternational,2004,37:6792687.[12].[D].:,2003.ZhaoSX.Astudyonnonlineardynamicpropertiesofjournal[D].Xian:XianJiaotongUniversity,2003.[13]ZhouH,ZhaoSX,XuH,etal.Anexperimentalstudyonoil2filmdynamiccoefficients[J].TribologyInternational,2004,37:2452253.[14],.-[M].:,2001.ExperimentalStudyonDynamicPerformanceofCompliantAerodynamicFoilJournalAirBearingsYANGLi2hua1,2,SHIJian2hua1,LIUHeng1,YULie1(1.MechatronicsandInformationSystemInstituteofXianJiaotongUniversity,Xian710049,China;2.MechatronicsEngineeringDepartmentofLanzhouJiaotongUniversity,Lanzhou730070,China)Abstract:Atestrigwasbuilttostudytheperformancesofnewcompliantaerodynamicfoiljournalairbearings.Thispaperintroducedanexperimentalmethodtoidentifyeightlineardynamiccoefficientsofthefoilgasbearingsunderdifferentexcitationfrequencies.Theexperimentwasperformedwhenthestaticloadandtherotatingspeedwere60Nand9000rpm,respectively.Thedisturbedspeedandaccelerationofthejournalcenterwereobtainedbythemethodofcenterdifferenceofitsdisplacement.Intimedomain,thelinearstiffnessanddampingcoefficientsofeachexcitationfrequencywerecalculatedbymeansofleastmeansquare.Finally,theeffectoftheexcitationfre2quencyonthedynamiccharacteristicsofthebearingwasinvestigated.Experimentalresultsshowthatthevibrationorbitofthejournalcenteriselliptic.Andwiththeexcitationfrequencyincreasing,theperturbationamplitudesofthejournalcenterincrease,butthedirecttermsofthestiffnessanddampingcoefficientsofthebearingdecrease.Thecross2couplingtermschangelittlewiththechangesofdynamicexcitationfrequency,andtheirvaluesaremuchsmallerthanthoseofthedirectterms.Whentheexcitationfrequencyisequaltotheworkingfrequencyoftherotor,becauseoftheeffectofthecomponentsoftheworkingfrequency,theperturbationamplitudeofthejournalcenterincreasesignificantlyandthedirecttermsofthestiffnessanddampingcoefficientsaremuchsmallerthanthoseofotherexcitationfrequencies.Keywords:turbomechinery,foilairbearings,excitationfrequency,linearstiffnessanddampingcoefficients,cen2terdifferenceAuthor:YULie,male,bornin1948,Ph.D.,Professor,e2mail:[e-mail]7534: