>> P.308
MeanEquivalentLoadforFluctuatingLoadWhentheloadontheLinearWayandLinearRollerWayvaries,insteadofdynamicequivalentloadP,themeanequivalentloadPmisusedforcalculatingformulaoflife.Themeanequivalentloadisaloadconvertedtogivelifeequaltothatforfluctuatingload.Itisobtainedbythefollowingformula:where,Pm:Meanequivalentload,NL:Pn:p:Totaltravelingdistance,mFluctuatingload,NExponent(balltype:3,rollertype:10/3)Table7givescalculationexamplesofthemeanequivalentloadfortypicalfluctuatingloads.Table7MeanequivalentloadforfluctuatingloadExampleMeanequivalentload(12)Pm=PndLpL0L1pPmaxPmLL3(2Pmax+Pmin)Pm≒1―where,PmaxPmin:Maximumvalueoffluctuatingload,N:Minimumvalueoffluctuatingload,N1N=0.102kgf=0.2248lbs.1mm=0.03937inchⅢ-14where,L1L2Ln:TotaltravelingdistancereceivingtheloadP1,m:TotaltravelingdistancereceivingtheloadP2,m:TotaltravelingdistancereceivingtheloadPn,mP1pL1+P2pL2+…+PnpLn)L(1pP=mP1P2PmPnLnL1L2①StepwisechangingloadPP②MonotonouslychangingloadPmi
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