Dr. Monika IvantysynovaMAHA Professor Fluid Power SystemsDesign and Modeling of Fluid Power SystemsME 597/ABE 591 Lecture 12MAHA Fluid Power Research CenterPurdue UniversitySICFP’05, June 1-3, 2005, Linköping © Dr. Monika IvantysynovaDesign and Modeling of Fluid PowerSystems, ME 597/ABE 5912Contents- Classification of power supply systems- Modeling of pump control - Load sensing systems- Pump control systemsUxControllerxcomSICFP’05, June 1-3, 2005, Linköping © Dr. Monika IvantysynovaDesign and Modeling of Fluid PowerSystems, ME 597/ABE 5913Classification of hydraulic actuatorsSICFP’05, June 1-3, 2005, Linköping © Dr. Monika IvantysynovaDesign and Modeling of Fluid PowerSystems, ME 597/ABE 5914Overview pressure supply systemsUxControllerxcomFixed displacement pumpsVariable displacement pumpsFlow sourcePressure sourcePressure controlled systems14SICFP’05, June 1-3, 2005, Linköping © Dr. Monika IvantysynovaDesign and Modeling of Fluid PowerSystems, ME 597/ABE 5915EMArten der Verstellsysteme von Verdrängermaschinen mechanische Verstellungelektromechanische Verstellungelektrohydraulische Verstellunghydraulische Verstellung15Classification pump controlsystemsOpen and closed loop controlManual actuationHydraulic controlElectro-hydraulic actuationElectro-mechanical actuationSICFP’05, June 1-3, 2005, Linköping © Dr. Monika IvantysynovaDesign and Modeling of Fluid PowerSystems, ME 597/ABE 5916Volumetrische Verluste f (p)Direktgesteuerte Regelung von Pumpen und Motoren - Nullhubregelung Ziel: konstanter Systemdruck bei minimalen Leistungsverlusten QFederkennlinie0 Qmax17DruckregelungenPump controlPressure compensated pump – direct hydraulically operated & controlledSpringVolumetric losses f(p)SICFP’05, June 1-3, 2005, Linköping © Dr. Monika IvantysynovaDesign and Modeling of Fluid PowerSystems, ME 597/ABE 5917Axial piston pump – force analysisFTGAFRKyxPump ModeODPFSKzFSKFSKypFDKFTKsFKF'KFaKFRKyzvK0yAF'K ßFTGls1ls2lKPressure force: ekeKDKppdppAF 42Inertia force:2 RmamFKuKKCentrifugal force:costan2 RmamFKKKaKPiston friction force: KRKKTKvsignFfF Slipper friction force:GGRrTGdrrF2FSK… reaction force of swash platefriction coefficientKfKf13withATSICFP’05, June 1-3, 2005, Linköping © Dr. Monika IvantysynovaDesign and Modeling of Fluid PowerSystems, ME 597/ABE 5918Forces applied on the pistonFTGAFRKyxPump ModeODPFSKzFSKFSKypFDKFTKsFKF'KFaKFRKyzvK0yAF'K ßFTGls1ls2lKResultant radial force:FSK… reaction force of swash plateKf14cosAKSKFF TKaKDKAKFFFF AT 22TGxKxTGyKySKyRKFFFFFF Resultant axial piston force:Reaction force of swash plate:SICFP’05, June 1-3, 2005, Linköping © Dr. Monika IvantysynovaDesign and Modeling of Fluid PowerSystems, ME 597/ABE 5919Forces exerted on swash plateßxMsxi=1i=2i=3i=4i=5i=6i=7i=8i=9FAKiFNiFNxi izyMszMsyATITyTKiaKiDKiAKiFFFF tansin AKiNSiSyiFFFFNSiziNSiNFF1FSyiTrajectory of origin of FN0SxFziAKiSzFF1SICFP’05, June 1-3, 2005, Linköping © Dr. Monika IvantysynovaDesign and Modeling of Fluid PowerSystems, ME 597/ABE 59110Pressure forces dependent oncylinder pressureNormal force FN changes its origin during one shaft rotationxi=1i=2i=3i=4i=5i=6i=7i=8i=9xi iye1e2ATITPressure force FDKidepends oninstantaneous cylinder pressure pi190SxFziAKiSzFF1ziAKiziSyiSyFFF11tanTKiaKiDKiAKiFFFF SICFP’05, June 1-3, 2005, Linköping © Dr. Monika IvantysynovaDesign and Modeling of Fluid PowerSystems, ME 597/ABE 59111Moments acting on swashplate0SxFziAKiSzFF1 ziSiSyiSiSziSxzFyFM1iSiSiiSiiSiRyzRyRxcostantancossin 21tan1cos iziAKiSxFRMiziAKiSxFRMcoscos12iziAKiziSiSziSyFRxFMsin11TSziziAKiTSzSiziSyiSzMFRMxFM sintan11Moment due to friction force of slipper FTG21ziAKiziSyiSyFFF11tanßxMsxi=1i=2i=3i=4i=5i=6i=7i=8i=9FAKiFNiFNxi izyMszMsySICFP’05, June 1-3, 2005, Linköping © Dr. Monika IvantysynovaDesign and Modeling of Fluid PowerSystems, ME 597/ABE 5911222Moments acting on swash plateslipperSwash plateFriction forces FTS exerted on swash plate due to slippermovement:iTSiTSyiFFsinTGiTSiFF iTSiTSxiFFcos0TSziF ziTSiTSxiTSiTSyiTSzyFxFM1 ziTSiziiiTSiTSzFRFRM1122cossin ziiziAKiTSiTSzSiziSyiSzFFRMxFM1 11sintaniSiiSiiSiRzRyRxcostancossinSICFP’05, June 1-3, 2005, Linköping © Dr. Monika IvantysynovaDesign and Modeling of Fluid PowerSystems, ME 597/ABE 59113Forces exerted on swash plateResulting force FSexerted on swash plate:22SzSySFFF iziAKiziSiSziSyFRxFMsin11and moments about y- and z-axis: ziiziAKiTSiSzFFRM1 1sintanmust be carried by swash platebearing23Moment MSxiziAKiSxFRMcoscos12In case of variable displacement pumpsMSxmust be overcome by the swash platecontrol systemßxMsxi=1i=2i=3i=4i=5i=6i=7i=8i=9FAKiFNiFNxi izyMszMsyyzMSxyxMSzSICFP’05, June 1-3, 2005, Linköping © Dr. Monika IvantysynovaDesign and Modeling of Fluid PowerSystems, ME 597/ABE 59115Pumpendruckregelung mit EinkantensteuerungSchaltplandarstellung18Pump controlPressure compensated pump using one variable hydraulic resistanceSICFP’05, June 1-3, 2005, Linköping © Dr. Monika IvantysynovaDesign and Modeling of Fluid PowerSystems, ME 597/ABE 59116Hydraulische Pumpendruckregelung mit ZweikantenvorsteuerungSchaltplan19DruckregelungenPump controlPressure compensated pump using two variable hydraulic resistancesSICFP’05, June 1-3, 2005, Linköping © Dr. Monika IvantysynovaDesign and Modeling of Fluid PowerSystems, ME 597/ABE 59117Load sensingLoad-Sensing mit VerstellpumpeLoad-Sensing mit KonstantpumpeEM EM20with variable displacement pump with fixed displacement pumpSICFP’05, June 1-3, 2005, Linköping © Dr. Monika IvantysynovaDesign and Modeling of Fluid PowerSystems, ME 597/ABE 59118Prinzip der
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