Design and Modeling of Fluid Power流体动力与建模

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1、DesignandModelingofFluidPowerSystemsME597/ABE591Lecture8Dr.MonikaIvantysynovaMAHAProfessorFluidPowerSystemsMAHAFluidPowerResearchCenterPurdueUniversityContents-HydraulicResistances-HydraulicBridges,halfbridgeelements-Flowgain,pressuregain-Pressure–flowmeteringcharacteristics-Flowforces-Direct

2、ionalcontrolvalves-Pressurecontrolvalves-FlowcontrolvalvesDesignandModelingofFluidPower©Dr.MonikaIvantysynova2Systems,ME597/ABE591HydraulicResistancesDesignandModelingofFluidPower©Dr.MonikaIvantysynova3Systems,ME597/ABE591HydraulicResistancesDesignandModelingofFluidPower©Dr.MonikaIvantysynova

3、4Systems,ME597/ABE591HydraulicResistancesVariableresistance(turbulent)2Q=α⋅π⋅d(y+y)⋅⋅p−pD00ρSpoolvalveDesignandModelingofFluidPower©Dr.MonikaIvantysynova5Systems,ME597/ABE591HydraulicResistancesHydraulicbridgeFourvariablehydraulicresistancesFourmeteringedgesDesignandModelingofFluidPower©Dr.M

4、onikaIvantysynova6Systems,ME597/ABE591HydraulicResistancesDefinitionofhydraulichalfbridgeelements1variable+1fixedTypeA2variableTypeBTypeCTypeD2fixed1variable+1fixedDesignandModelingofFluidPower©Dr.MonikaIvantysynova7Systems,ME597/ABE591MatrixofhydraulicbridgesResistanceincreaseOrificediameter

5、decreasethrottlevalveclosingResistancedecreaseOrificediameterincreasethrottlevalveopeningDesignandModelingofFluidPower©Dr.MonikaIvantysynova8Systems,ME597/ABE591CharacteristicvaluesofhalfbridgeelementsAFlowgain:DefinedundernoloadconditionsQA∂QAC==ttan⋅g⋅αQp0∂ypA=;y=02Flowgainincaseofelectrici

6、nput∂QAx⎛Q⎞V=⎜⎟Qi∂ixmax⎝Qmax⎠αVelocitygain:y⎛i⎞⎜⎟∂x˙Cy0⎝imax⎠QCV=p=0∂ypA=;y=0A2DesignandModelingofFluidPower©Dr.MonikaIvantysynova9Systems,ME597/ABE591CharacteristicvaluesofhalfbridgeelementsAPressuregain(sensitivity):DefinedatblockedportQA∂pAC=px˙=0;y=0∂yPressuregain(sensitivity)incas

7、eofelectricalinput:F⎛p⎞∂p⎜⎟Fmax⎝pmax⎠V=pi∂iβy⎛i⎞Forcegain:⎜⎟y0⎝imax⎠∂FC==c⋅AFx˙=0;y=0p∂yDesignandModelingofFluidPower©Dr.MonikaIvantysynova10Systems,ME597/ABE591SpoolLapConfigurationsforforfor

8、y

9、≤y0DesignandModelingofFluidPower©Dr.Monik