TY - GEN
T1 - Epistemic uncertainty in reliability-based design optimization
AU - Zhuang, Xiaotian
AU - Pan, Rong
PY - 2012
Y1 - 2012
N2 - Reliability-based design optimization (RBDO) needs to take into account of both aleatory and epistemic uncertainties. It is critical to explore these uncertainty sources and evaluate their impacts on RBDO. This paper provides a comprehensive study of uncertainties, in which the uncertainty sources are listed, categorized and their impacts are discussed. Epistemic uncertainty is of our interest, which is due to lack of knowledge and can be reduced. We specifically discuss the epistemic uncertainties due to unknown constraint function and unknown random variable distribution. The strategies to address epistemic uncertainty are summarized. An I-beam case study is employed to illustrate the impact of epistemic un certainty on RBDO, in which a Kriging model is used to approximate the unknown true constraint function and the root-mean-square error (RMSE) parameter estimate is used to replace the unknown distribution parameters.
AB - Reliability-based design optimization (RBDO) needs to take into account of both aleatory and epistemic uncertainties. It is critical to explore these uncertainty sources and evaluate their impacts on RBDO. This paper provides a comprehensive study of uncertainties, in which the uncertainty sources are listed, categorized and their impacts are discussed. Epistemic uncertainty is of our interest, which is due to lack of knowledge and can be reduced. We specifically discuss the epistemic uncertainties due to unknown constraint function and unknown random variable distribution. The strategies to address epistemic uncertainty are summarized. An I-beam case study is employed to illustrate the impact of epistemic un certainty on RBDO, in which a Kriging model is used to approximate the unknown true constraint function and the root-mean-square error (RMSE) parameter estimate is used to replace the unknown distribution parameters.
KW - Epistemic Uncertainty
KW - Reliability-Based Design Optimization
UR - http://www.scopus.com/inward/record.url?scp=84860627965&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84860627965&partnerID=8YFLogxK
U2 - 10.1109/RAMS.2012.6175496
DO - 10.1109/RAMS.2012.6175496
M3 - Conference contribution
AN - SCOPUS:84860627965
SN - 9781457718496
T3 - Proceedings - Annual Reliability and Maintainability Symposium
BT - 2012 Annual Reliability and Maintainability Symposium, RAMS 2012 - Proceedings and Tutorials
T2 - 2012 Annual Reliability and Maintainability Symposium, RAMS 2012
Y2 - 23 January 2012 through 26 January 2012
ER -