Reliability assessment and probabilistic analysis of static response for turbine blade

Stochastic finite element methods and reliability techniques are used to determine the safety degree of the turbine blade with parametric uncertainty. The material, geometric parameters and rotating speed of blade exhibit notable random fluctuations, so the conventional deterministic analysis of blade can't provide complete information. The Stochastic analysis can tackle the uncertainties in structural parameters and obtain the probabilistic characters of the response. In this paper, the study focuses on the safety analysis of the blade with uncertainty parameters based on the stochastic finite element method (SFEM) and the mean-variance method. The second-order perturbation stochastic finite element method (PSFEM) is used to calculate probabilistic characters of the static response of the turbine blade. The random response of a rotating, blade subjected to transverse distributed force is analyzed using perturbation stochastic finite element method and the direct Monte Carlo simulating. Based on the SFEM the mean-variance method is used to calculate the reliability. The example shows that the present method is valid.