>> P.27
A24MeanequivalentloadcorrespondingtofluctuatingloadWhentheloadappliedtothebearingfluctuates,thebearinglifeiscalculatedbyusingthemeanequivalentloadFm,whichisaconstantloadthatwillgivethebearingalifeequaltothatproducedunderthefluctu-atingload.Themeanequivalentloadisobtainedfromthefollowingequation: ……………………(19)where,Fm:Meanequivalentload,N N:Totalnumberofrevolutions,rev. Fn:Fluctuatingload,N p: Exponent,Rollerbearing=10/3Ballbearing=3Table9showsexamplesofthecalculationofmeanequivalentloadsforvariousfluctuatingloads.Fm= ∫FndN1NN0ppTable9MeanequivalentloadforthefluctuationloadpTypeoffluctuatingloadMeanequivalentloadFmSteploadMonotonouslychangingloadSinusoidallyfluctuatingloadStationaryloadplusrotatingloadwhere,N1:TotalnumberofrevolutionsunderloadF1rev.N2:TotalnumberofrevolutionsunderloadF2rev.Nn:TotalnumberofrevolutionsunderloadFnrev.where,Fmax:Maximumvalueoffluctuatingload,NFmin:Minimumvalueoffluctuatingload,NFm≒0.65FmaxFm≒0.75Fmaxwhere,FS:Stationaryload,NFR:Rotatingload,NFm= (F1N1+F2N2+…+FnNn)1NppppFm= (2Fmax+Fmin)13Fm=FS+FR- FSFRFS+FRF1F2N1N2NNnFmFnFFFminFmaxFmNFmaxFmNFFmaxFmNFFsFRABCDEFGHIJKLM
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