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外文翻译--液压系统的控制元件隔振 英文版.pdf

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外文翻译--液压系统的控制元件隔振 英文版.pdf

ARCHIVESOFCIVILANDMECHANICALENGINEERINGVOLXI2011NO1VIBRATIONINSULATIONOFHYDRAULICSYSTEMCONTROLCOMPONENTSMSTOSIAKWROCG225AWUNIVERSITYOFTECHNOLOGY,WYBRZEG298EWYSPIAG276SKIEGO25,50370WROCG225AW,POLANDTHISPAPERDEALSWITHTHEEFFECTSOFEXTERNALMECHANICALVIBRATIONSONHYDRAULICVALVESATHEORETICALANALYSISOFTHECONTRIBUTIONOFSELECTEDVIBRATIONINSULATORSTOAREDUCTIONINHYDRAULICVALVEHOUSINGVIBRATIONSWASCARRIEDOUTTHERESULTSOFPRELIMINARYEXPERIMENTALTESTSOFSIMPLEVIBRATIONINSULATORSAREREPORTEDKEYWORDSMECHANICALVIBRATIONS,PRESSUREFLUCTUATIONS,HYDRAULICVALVE1INTRODUCTIONMAJORFEATURESOFHYDRAULICSYSTEMSAREPERIODICCHANGESOFPRESSUREAROUNDANAVERAGEVALUE,COMMONLYREFERREDTOASPRESSUREFLUCTUATIONSTHEIRCONSEQUENCESAREDEFINITELYNEGATIVETHECYCLICOPERATIONOFTHEPUMP’SDISPLACEMENTCOMPONENTS1ORTHESELFEXCITATIONOFTHECONTROLCOMPONENTSINHYDRAULICVALVES2DUETOTHEACTIONOFTHEFLOWINGLIQUID4ORTOEXTERNALMECHANICALVIBRATIONS3,5,6AREAMONGTHECAUSESOFPRESSUREFLUCTUATIONSPRESSUREFLUCTUATIONSCAUSETHEINDIVIDUALSYSTEMCOMPONENTSTOVIBRATETHISHASANADVERSEEFFECT,PARTICULARLYONTHEPRECISIONOFPOSITIONINGOF,FOREXAMPLE,THECUTTINGTOOLINAMACHINETOOLTHISALSOAPPLIESALTHOUGHTOASMALLERDEGREETOMOBILEMACHINESWHICHARETHESOURCEOFVIBRATIONSAFFECTINGTHERIGIDLYFIXEDHYDRAULICVALVESGENERALLY,THECOMPLEXPROBLEMOFTHETRANSMISSIONOFVIBRATIONSBYAMACHINEORAPIECEOFEQUIPMENTCANBEDIVIDEDINTOTHREEINTERCONNECTEDCATEGORIESG120VIBRATIONSOURCES,G120VIBRATIONTRANSMISSIONPATHS,G120EFFECTSTHEMOSTFREQUENTCAUSEOFVIBRATIONSAREDISTURBANCESCONNECTEDWITHTHEMOTIONOROPERATIONOFTHEMACHINE,FOREXAMPLEWHENAMOBILEMACHINEMOVESONANUNEVENSURFACEORWHENTHEROTATINGPARTSAREUNBALANCEDDURINGMATERIALMACHININGANOTHERMAJORVIBRATIONSOURCEAREDRIVEUNITS,FOREXAMPLEACOMBUSTIONENGINEPERFORMINGAPERIODICVARIABLECHARACTERISTICWORKCYCLE7,8ANOPERATINGHYDRAULICSYSTEMISALSOASOURCEOFMECHANICALVIBRATIONSCAUSEDMAINLYBYPRESSURESURGESANDTHEPERIODICOPERATIONOFTHEDISPLACEMENTPUMPSINCETHEGENERATEDVIBRATIONSHAVEDIFFERENTFREQUENCIESTHEPATHSOFTHEIRTRANSMISSIONAREALSODIFFERENTTHEIRREGULARITIESOFTHESURFACEONWHICHAMOBILEMACHINEMOVESCAUSEEXCITATIONSINAFREQUENCYRANGEOF05–250HZ9–11THELATTERINCLUDESEXCITATIONSGENERATEDBYTHEDRIVINGCOMBUSTIONENGINEANDTHEDISPLACEMENTPUMPKINEMATICS,MANIFESTINGTHEMSELVESINPRESMSTOSIAK238SUREFLUCTUATIONSINTHEMACHINE’SHYDRAULICSYSTEMTHEVIBRATIONSDUETOTHERESISTANCEOFFLOWINGAIRAREINAFREQUENCYRANGEOF250–16000HZANDTHEYARECAUSEDBYAIRFLOWSEPARATIONFROMTHEMACHINE’SCOMPONENTSALSOTHEFLOWOFTHEWORKINGMEDIUMINTHEHYDRAULICSYSTEMCAUSESVIBRATIONANDNOISESOMETIMESCAVITATIONOCCURS,GENERATINGHIGHFREQUENCYNOISETHEVIBRATIONSGENERATEDANDTRANSMITTEDBYAMACHINEPRODUCEVARIOUSEFFECTSMECHANICALVIBRATIONSAFFECTTHEMACHINEOPERATORTHECOMPONENTSOFTHESYSTEMSWITHWHICHTHEMACHINEISEQUIPPED,PARTICULARLYHYDRAULICCOMPONENTSANDSYSTEMSAREALSOSUBJECTTOMECHANICALVIBRATIONSSUCHCOMPONENTSAREREQUIREDTOHAVEGOODDYNAMICPROPERTIESANDTOBECHARACTERIZEDBYSTABILITY,POSITIONINGPRECISION,OPERATINGRELIABILITYANDCERTAINTYANDLITTLENOISINESSMODERNPROPORTIONALHYDRAULICVALVESORHYDRAULICMICROVALVESAREPARTICULARLYEXPOSEDTOEXTERNALMECHANICALVIBRATIONSSINCETHEDISTURBINGFORCESINTHEMCANAMOUNTTOTHECONTROLLINGFORCES,WHICHMAYLEADTOMANYADVERSEEFFECTS,SUCHASSTABILITYLOSS,POSITIONINGINACCURACY,DAMAGETOSEALSANDINCREASEDNOISINESS122FLEXIBLEFIXINGOFHYDRAULICVALVEASMENTIONEDABOVE,INORDERTOMINIMIZETHEVIBRATIONOFTHEHYDRAULICVALVE’SCONTROLELEMENTITSEEMSSENSIBLETOISOLATETHEVALVEHOUSINGFROMTHEEXTERNALMECHANICALVIBRATIONSOFTHEBASEFOREXAMPLETHEVIBRATINGFRAMEOFAMOBILEMACHINEORAMACHINETOOLFORTHEANALYSISOFTHEEFFECTOFTHEFLEXIBLEFIXINGOFAHYDRAULICVALVEONTHEVIBRATIONOFITSHOUSINGASPECIALCLAMPINGHOLDERFORTHEHYDRAULICDISTRIBUTORWASDESIGNEDTHELATTERISONITSTWOSIDESSUPPORTEDBYASYSTEMOFSPRINGSWITHAKNOWNLINEARCHARACTERISTICANDAKNOWNPREDEFLECTIONFIGURE1FIG1VALVEHOLDER1–HYDRAULICVALVEDISTRIBUTOR,2–HOLDERBASE,3–SPRINGPREDEFLECTIONBOLTS,4–SPRINGS,5–SECURINGCATCHESTHEDESIGNOFTHEHOLDERISSUCHTHATTHEVALVEMOUNTEDINITISCONSTRAINEDBYSPRINGSWITHANEQUIVALENTSTIFFNESSANDITMOVESONTHEHOLDERBASE2INFIGURE1RUBBINGAGAINSTITINACCORDANCEWITHTHEDRYFRICTIONMODELONITSTWOSIDESTHEVALVEVIBRATIONINSULATIONOFHYDRAULICSYSTEMCONTROLCOMPONENTS239ISSUPPORTEDBYSPRINGSASCHEMEOFTHEHYDRAULICSYSTEMINWHICHTHEPROPORTIONALDISTRIBUTORTYPE4WRE6E0812/24Z4/MOPERATESISSHOWNINFIGURE2TPAB413WW0SIN2G83FTFIG2SCHEMEOFHYDRAULICSYSTEMINCORPORATINGINVESTIGATEDCOMPONENT1–FEEDPUMP,2–RELIEFVALVE,3–INVESTIGATEDCOMPONENT,4–ADJUSTABLETHROTTLEVALVEFORATWOMASSSYSTEMTHEMODELOFTHEPROPORTIONALDISTRIBUTOROPERATINGINTHEHYDRAULICSYSTEMSHOWNINFIGURE2CANBEREPRESENTEDBYTHEFOLLOWINGSYSTEMOFFOUREQUATIONSG11G12G11G12G11G12G11G12G11G12G11G12G11G12G11G12G11G12G11G12G11G12G11G12G11G12G176G176G176G176G176G176G176G176G175G176G176G176G176G176G176G176G176G174G173G32G152G152G152G16G14G14G16G152G16G16G16G152G152G152G14G14G16G152G14G16G152G14G16G152G14G152G32G152G152G152G16G152G16G152G16G152G16G32G152G16G152G16G16G152G152G16G152G152G16G32G16G152G14G14G16G152G16G152G152G152G152G14G16G152G152G152G152G14G15201,02,0251,217202222022212112122212211111111212121121212111GIMWXSINGWXSINGWXLHGMWXCXXKXXCXMPACPCPCPAQPCPAPPXXXSQFXXCPPXXXSXXHLDXMZAQKKPPKPMPSPMMPSTG80G80G85G85G91G80G83G5G5G5G5G5G5G5G5G5G5G5G5G5G5G51MSTOSIAK240THEFOURTHEQUATIONDESCRIBESTHEFORCESACTINGONTHEVALVEHOUSINGINTHECONSIDEREDCASEFURTHERONTHISEQUATIONWILLBEMODIFIEDTODESCRIBETHECHARACTERISTICSOFTHEPROPOSEDVIBRATIONINSULATIONELEMENTSSOMESIMPLIFYINGASSUMPTIONSTOEQUATIONS1G120WORKINGLIQUIDDOESNOTCHANGEITSPROPERTIES,G120COULOMBFRICTIONISNEGLECTEDINPAIRSPOOLMUFFINSIDEDIRECTIONALCONTROLVALVE,G120COULOMBFRICTIONREPRESENTSCOOPERATIONBETWEENVALVEBODYANDVALVEHOLDER,G120AFTERPLAYBETWEENVALVEBODYANDSECURINGCATCHESISCANCELLEDCOULOMBFRICTIONREPRESENTSCOOPERATIONBETWEENVALVEBODYANDSECURINGCATCHES,G120SPRINGSCHARACTERISTICSARELINEARANDDESCRIBEDBYSTIFFNESSCOEFFICIENTC,G120DESCRIPTIONOFHYDRAULICSYSTEMISBASEDONCONCENTRATEDPARAMETERMODEL,G120THEMODELDOESNOTREPRESENTINFLUENCEPIPESONVALVEBODYVIBRATIONSLISTOFMAJORSYMBOLSSYMBOLPARAMETERDIMENSIONINSIAP1LEAKAGECOEFFICIENTM4S/KGAATHROTTLEVALVEGAPAREAM2C1EQUIVALENTSTIFFNESSOFVALVECENTRINGSPRINGSN/MCZEQUIVALENTSTIFFNESSOFSPRINGSFIXINGVALVEINHOLDERN/MCQ1THROTTLEVALVEFLOWRATIO–DTPISTONDIAMETERMFFREQUENCYHZGEARTH’SACCELERATIONM/S2HVALVESLEEVEPAIRGAPTHICKNESSMHHEAVISIDESTEPFUNCTION–K1,K2DAMPINGINRESPECTIVELYVALVESLEEVEPAIRANDHOUSINGHOLDERPAIRNS/MLPISTONLENGTHML0GAPOFVALVEBODYANDSECURINGCATCHESMM1MASSOFPISTONVALVEAND1/3OFSPRINGMASSKGM2MASSOFDISTRIBUTORHOUSINGKGP1PRESSUREBEFOREDISTRIBUTORPAP2PRESSUREAFTERDISTRIBUTORPAPZSINKLINEPRESSUREPAG39P2THROTTLEVALVEPRESSUREDROPPASSMAXIMUMGAPWIDTHMTTIMESWEXCITATIONVIBRATIONAMPLITUDEMQPTHEORETICALPUMPDELIVERYM3/SXMGAPLENGTHMXPMUTUALSHIFTOFVALVEANDHOUSINGEDGESMX1DISPLACEMENTOFPISTONVALVEMX2DISPLACEMENTOFDISTRIBUTORHOUSINGMG802COEFFICIENTOFFRICTIONOFVALVEHOUSINGAGAINSTSECURINGCATCHES–G80ICOEFFICIENTOFFRICTIONOFVALVEHOUSINGAGAINSTHOLDERBASE–G85WORKINGLIQUIDDENSITYKG/M3G90ANGULARFREQUENCYRAD/S

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