Stochastic characteristic analysis of turbine rotor based on response surface method

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