In this topic I want to mention some parts of your precious work entitled “Surrogate-assisted reliability-based design optimization: a survey and a unified modular framework” and benefit from your comments/clarifications regarding the QMC-based RBDO problem:
In the case-3 analysis, the following statements are mentioned in your paper with Prof. Sudret:
“we consider a two-stage enrichment scheme”
“The idea behind is to locate the limit-state surface without necessarily focusing on extreme accuracy”
“The remaining epistemic uncertainty due to surrogate modelling is taken care of in the second stage where optimization is coupled with enrichment”
“case no. 3 does not exactly illustrate the proposed framework and is qualified here as gray-box because of the coupling between optimization and surrogate modelling.
I was wondering if the implemented QMC-based RBDO in UQLab benefits from the mentioned two-stage enrichment scheme or not? In other words, It seems the grey-box modelling is already implemented in the RBDO module of UQLab or this two-stage configuration is not supported in UQLab yet.
Last but not least, as always, I really appreciate any help from RSUQ and other community members.