実験計画法を用いたガスタービン高温部品の実働境界条件の同定手法 : 第1報,逆問題解析を用いた余寿命評価手法

Gas turbine operating conditions are severe, especially for hot-gas-path components. The components are subjected to the conditions of thermal load, dynamic pressure oscillation, and environmental attack due to hot gas. However, the service conditions are complex and difficult to determine. To improve the accuracy of the life assessment of such components, an analytical method for estimating the service boundary conditions for these components has been developed. This method consists of FEA (finite element analysis), design of experiments, and metallurgical inspection of actual machine components. The FEAs varied with boundary conditions are analyzed using an orthogonal array. In each analysis, difference between results of an FEA and results of the metallurgical inspection are estimated. The model is modified to reduce the difference by using analyses of variance. The modified model is applied to damage analyses and life assessment. The method was applied to a gas turbine blade and the good agreement between the analysis results and the inspection data confirmed the validity of the method.