Storage life assessment for solid propellant based on generalized linear model

To describe the influence of performance degradation on storage life and reliability for solid propellant, a method of storage life and reliability assessment based on generalized linear model was proposed. According to the characteristic of solid propellant degradation data, the local scale model was introduced to relate the solid propellant tensile strength to storage time, and the storage life and reliability model for solid propellant was established. The maximum likelihood estimations of the model coefficients were obtained with the generalized linear model for Poisson distribution. Furthermore, the approximated confidence interval for the reliability function was obtained with Fisher information matrix according to the normal law. The instance analysis shows that the performance data under varied storage time was used synthetically to enlarge the sample size and increase the information for storage reliability assessment. Thus, the storage life and reliability assessment precision was improved.