Momentum wheel Wiener process degradation modeling and life prediction

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.