>> P.308
Ⅲ-14MeanEquivalentLoadforFluctuatingLoad1N=0.102kgf=0.2248lbs.1mm=0.03937inchWhentheloadontheLinearWayandLinearRollerWayvaries,insteadofdynamicequivalentloadP,themeanequivalentloadPmisusedforcalculatingformulaoflife.Themeanequivalentloadisaloadconvertedtogivelifeequaltothatforfluctuatingload.Itisobtainedbythefollowingformula:Pm=(12)where,Pm:Meanequivalentload,NL:Totaltravelingdistance,mPn:Fluctuatingload,Np:Exponent(balltype:3,rollertype:10/3)Table7givescalculationexamplesofthemeanequivalentloadfortypicalfluctuatingloads.PndLpLp0L1Table7MeanequivalentloadforfluctuatingloadExampleMeanequivalentload①StepwisechangingloadPm=L(P1pL1+P2pL2+…+PnpLn)p1where,L1:TotaltravelingdistancereceivingtheloadP1,mL2:TotaltravelingdistancereceivingtheloadP2,mLn:TotaltravelingdistancereceivingtheloadPn,m②MonotonouslychangingloadPm≒1―3(2Pmax+Pmin)where,Pmax:Maximumvalueoffluctuatingload,NPmin:Minimumvalueoffluctuatingload,NLLnL2P2P1PPnPmL1LPPmPmiPmax
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