Abstract:

Aiming at the mechanical & electrical product that its lifetime obeys to Weibull distribution and has used in field, a single-stress & time-switching step-stress accelerated life test is done to study the integrated assessment problem between field using data and accelerated life test (ALT) data. Considering the difference between field multi-stress environment and laboratory single-stress environment, a distribution parameter model with the correction factors is constructed. Statistical analysis for the integrated process of field -using and the ALT is done. Its cumulative distribution function relationship under each stress is built. The maximum likelihood function of integrated filed using and ALT data is built. The data iteration method is used to determine the estimation value of unknown parameters. A certain mechanical & electrical product is used to design a simulation project. The sample data is obtained by Monte Carlo simulation. A contrastive analysis shows that the proposed model is more accurate.