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200666-207-200666-208-wT·PGT31w3µ=1Gµ=µPhT·+=ηω0whiTT0ωi0ωi+η0hT·2h0h0hDFT⋅=0hFhDmaxaT·0hhmaxaTTT−=0h0wTiT−+ηωF=FmaxaTgrgrmaxPSmax/PF)(422dDS−=200666-209-Dd2/25.121dv××=1d2Q0Qv××S×610−1Q1Q0Q2QmaxnqQn/1max=yPmax1yPQP×=iT·mmaxi2η××=qPTmηneTeP602eee⋅⋅=VTP····200666-210-DesignMethodDiscussionoftheElectro-hydraulicPowerSteeringSystemGENGGuo-qingMIAOLi-dongLIQiang(JiangsuProvinceKeyLaboratoryofAutomotiveEngineering,JiangsuUniversity,Zhenjiang212013,China)Abstract:Inordertoimprovetheperformanceofautomobilepowersteeringsystemandreducetheenergyconsumptionofthissystem,thestructureandoperationprincipleofanElectro-HydraulicPowerSteeringSystem(EHPS)withamotor-pumparedescribed,andanalysesofitsfunctioniscarriedout.Accordingtothestudyresultandwiththefunctionrequirementofsteeringsystem,andbyusingautomobiledesignandfluiddrivetheory,thedesignmethodofthissystemanditsmatchingwiththewholecararepresented.Designandcalculationbasedonthismethodwerecarriedouttargetingforadomesticcar,andtheresultcomparedwiththeforeigncounterpartprovesthatitiscorrectand.effective.Keywords:vehicleengineering;electro-hydraulicpowersteering;theoreticalresearch;structureandprincipleAbstractID:1003-188X(2006)06-0204-EATheEstablishmentandApplicationofEnvironmentalGeochemistryInformationSystemLIHua1,2,LIFang-lin3,XIABin1(1.GuangzhouGeochemistryResearchInstitute,ChinaScientificAcademy,Guangzhou510640,China;2.GraduateSchoolofChinaScientificAcademy,Beijing100039,China;3.CalculationGeochemistryResearchOffice,ChinaGeologicUniversity,Wuhan430074,China)Abstract:TheauthormadeuseofthereconstructionfunctionofMapGIStoexploitaenvironmentalgeochemistryinformationsystemincludingtheregionalgeologyintroductionsubsystem,theattributiondatabasemanagementandanalyzesubsystem,thespatialdatabasemanagementandanalyzesubsystem.Therealizationandthedesignmethodofthesystemhasbeenintroduced,andthespatialdatabasemanagementandanalyzesubsystemhasbeenelaborated.ThenthesystemhasbeenappliedtotheregionofHubeiHuangshitoanalyzeandqualityevaluatestotheenvironmentalgeochemistrydata,whichhasprovedthevalidityandfeasibilityofthesystem.Keywords:environmentalscientifictechnicalbasicscience;environmentalgeochemistryinformationsystem;design;MapGIS