Bearing fatigue life test method

Bearing fatigue life is very discrete, to use mathematical statistics to process the data. This test uses a simple and convenient censoring method. Set the test bearing n sets, of which r sets of bearings have been destroyed, their life span, respectively, L1, L2, Lr. The remaining (nr) sets of bearings have been tested Lr + 1, Lr +2, ... Ln time, not yet destroyed. At this point can no longer be tested, the experimental data obtained has been used to calculate the estimated parameters of the original life distribution. Censoring method has two kinds of timing and fixed number, the test using the Censoring method. Given the number of sets of bearings that should be fatigue-damaged, r, also known as the truncation number, stop the test after the given number of truncations, and the fatigue life of the bearing should be made greater than the longest life in fatigue-damaged bearings . A radial load of 588 N was applied on a 204-type composite roller bearing with oil lubrication for a given number of caterpillars of 15. Test machine speed 12800r / min, the test frequency and temperature of all specimens the same. In addition, for the sake of comparison, 25 sets of 204 plastic bearings made of nylon 66 were also tested at the same time. The radial load was 392N and 20 # oil lubrication. The given number of truncations and the speed of the test machine were the same as that of the composite bearings.