Stochastic Characteristic Analysis of Turbine Blade Based on Response Surface Method

In order to improve the reliability of the turbine blade design, response surface method was introduced into probability finite element, material parameters and load parameters of the blade were considered as input random variables, the statistical characteristics and cumulative distribution function of stochastic response of the blade were obtained. Then, probability sensitivities analysis was applied to evaluate how much the output parameters were influenced by the random input parameters. In the last, how to improve the reliability of the blade was advanced through analyzing scatter plots of structural responses with respect to the random input variables. The results show that using this method leads to fast speed, much less amount of calculation and high accuracy.