For the problem that there is no failure data to use in momentum wheel's life prediction

a model of the degradation of momentum wheel' bear temperature was established using Wiener process with drift.At the same time

considering of the uncertainty which was made by the process technics and manufacturing error

the drift and the diffusion parameters were described as stochastic variables

and the bias correction estimate was obtained using bootstrap method.And then

the sample path was simulated based on the established model.At last

the life prediction and residual life prediction were performed at the uncertain failure threshold.The model provides a method for the degradation modeling and life prediction of momentum wheel

and the theory and method can be generalized for the degradation modeling and life prediction of some similar high reliability and long life products.