>> P.27
ABCDEFGHIJKLMN1N2NFnNnwhere,N1:Total number of revolutions under load F1 rev.N2:Total number of revolutions under load F2 rev. Nn:Total number of revolutions under load Fn rev. Fm= (F1 N1 +F2 N2+…+Fn Nn)ppppp1NF1FF2Fm ……………………(19) Np0Fm= ∫Fn dN1Npwhere,Fm:Mean equivalent load,N N:Total number of revolutions,rev. Fn:Fluctuating load,N p: xponent, Roller bearing = 10/3 Ball bearing = 3Table 9 shows examples of the calculation of mean equivalent loads for various uctuating loads.Mean equivalent load corresponding to fluctuating loadWhen the load applied to the bearing uctuates, the bearing life is calculated by using the mean equivalent load Fm, which bearing a life equal to that produced under the uctu-is a constant that will give load the ating load. The mean equivalent load is obtained from the following equation:Table 9 Mean equivalent load for the fluctuation loadType of fluctuating loadMean equivalent loadFmwhere,Fmax:Maximum value of uctuating load,NFmin:Minimum value of uctuating load,NFm= (2Fmax+Fmin )13FmaxFmNFmFmNFm≒0.65FmaxFm≒0.75FmaxFFminFNFmaxSinusoidally fluctuating loadFFmaxStep loadMonotonously changing loadStationary load plus rotating loadFsFRFm=FS+FR- FSFRFS+FRwhere,FS:Stationary load,NFR:Rotating load,NA24
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