Technical>Mean load
Mean load
The load on bearings used in machines under normal circumstances will, in many cases, fluctuate according to a fixed time period or planned operation schedule. The load on bearings operating under such conditions can be CONVERTED TO A MEAN LOAD (Fm), this is a load which gives bearings the same life they would have under constant operating conditions.

(1) Fluctuating stepped load
The mean bearing load, Fm, for stepped loads is calculated from following formula. F1 , F2 ....... Fn are the loads acting on the bearing; n1, n2.......nn and t1, t2....... tn are the bearing speeds and operating times respectively.

(2) Consecutive series load
Where it is possible to express the function F(t) in terms of load cycle to and time t, the mean load is found by using formula as following:

(3) Linear fluctuating load
The mean load, Fm , can be approximated by formula:

(4) Sinusoidal fluctuating load
The mean load, Fm, can be approximated by following formulas:

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