Response surface based multi criteria optimization of turbine wheels fir-tree attachments
Résumé
Designing turbine wheels fir-tree attachments implies to satisfy numerous criteria. It involves three-dimensional finite elements analysis taking into account plasticity and time dependent behaviour. These numerical analysis are time consuming and very expensive. Consequently, they cannot be directly used to optimize strength and robustness. To work around this difficulty, we use mathematical response surfaces. They are built with a few calls to the finite elements model. With the great advantage of their short response time, response surfaces allow deploying optimization algorithms. The best geometries regarding performance and geometry mismatch robustness can then be obtained. An example of mixed continuous-discrete variables optimization will illustrate our presentation.