牵引力测试中传感器信号的前置处理.pdf

k.|-)尹丽菊a,彭荣群b,陈null平b,申null晋a(va.0；b.9S/,*pnull255049)K1:对农业机械进行牵引力测试时,所采用的拉力传感器输出信号微弱,而且伴有噪声,必须将该信号进行前置处理才能给后续测试仪器提供适当的输入b采用前置放大电路和有源低通滤波器处理信号可以得到理想的效果b1oM:.；-)；bv；roms|:TN911.7nullnullnullnullnullDSM:BnullnullnullnullnullcI|:1006-0006(2007)04-0047-02SignalPreprocessofSensorinTractiveForceTestYINLinulljua,PENGRongnullqunb,CHENPingb,SHENJina(a.SchoolofElectricalandElectronicEngineering；b.SchoolofComputerScienceandTechnology,ShandongUniversityofTechnology,Zibo255049,China)Abstrac:tInordertosupplyproperinputsignalforinstrument,itnullsnecessarytopreprocesstheoutputsignalsoftractiveforcesensorinagriculturalmachinerytestduetotheyareveryweak.Keywords:Tractiveforcesensor；Preprocess；Amplifier；Filternullnull?B1S,C3k!k,Na_!93b!P.TkdS11Tb1null|+.?s?$ivB?pV|q,Yqqb,q.?s$s；q.?|qa.|sb.EMT.,T1,.G|1(015mV),H.2,1bv.)b2null-bv!9rFbv|,EFa.2aMbv-bv2,m1Ubm1null-bvFig.1Preamplifiernullnull)bbvEF,?LC.EF,NbA1,A24EFb,MMh,B)sbvA3|bymR2=R2,R1=R1,R4=R4,F|UIH,5ER3|,NHA1Tfm2bAv1=U01-U02UI=1+2R2R3；nullAv2=U0U01-U02=-R4R1T,U01A1bv；U02A2bv；U0A3bv,-bvbvAv=Av1!Av2=-R4R11+2R2R31.bv30,Av=30,5sY|R2=R2=R3=2knull,R1=R1=10knull,R4=R4=100knullbm2nullA1TfsFig.2AnalysisofA1Behavior3null|F!99|.,InV.2,NAro)b.|,Jq+,=RCYro(m3)bl:2006-09-13；l:2006-10-21:81S(2004ZX30)!47!344nullnullnullnullnullnullnullnullnullnullnullnullnullnullnulljnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullVo.l34No.42007M8nullnullnullnullnullnullnullnullnullnullnullnullnullnullnullTractor&FarmTransporternullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullAug.,2007m3null=RCYroFig.3SecondnullorderRCActiveLownullpassFilter=RCYro.fG(S)=Uo(s)Ui(s)=Af/(R1R2C1C2)S2+(R1C1)-1+(R2C1)-1+(1-Af)(R2C2)-1S+(R1R2C1C2)-1AfVU,9m,Af=1+RfRa7R1=R2=RnullnullC1=C2=CG(s)=Af1+(3-Af)jnullRC+(jnullRC)2Vq+A(null)=Afnull20null4+null2null20(2-2)+null40=Afnullnull04+nullnull02(2-2)+1=Afff04+ff02(2-2)+1T,null0f0sYYqYq,null0=1RC,f0=12!RC；ED,Vroqqf0EDT,=3-AfbYroq|q+bq+1|%+(Q)null0,51p!9q,InY9mb=RCYro+nm4bmV:EDVvVlabv,null=null0H,hv；l,null=null0H,vb=1.414H,+A(null)=11+nullnull04=11+ff0420lgA(null)=-10lg1+ff04|VUff0H,20lgA(null)=-10lgff04=-40lgff0,NH+40db/10h,Vrsb!Yq10Hz,4/R1=R2=R=10knullnullnullPbE,PRa/Rf=2R=20knull,Ra=Rf=40knullm4null=RCYro+Fig.4SecondnullorderRCActiveLownullpassFilter4null|Yk.15mVH,Vm5Mm6ombnullnull.sPH,BUIaYU0nV1bV1null.kTab.1DebuggingofTractiveForceSensorP/tUI/mVU0/V0.10.750.1050.32.250.3150.53.750.52517.51.051.511.251.5752152.1NVnYV),jkH,.|V.,7OYVgV