Probabilistic learning for modeling and quantifying model‐form uncertainties in nonlinear computational mechanics. (14th November 2018)

• Record Type: Journal Article
• Authors: Soize, C.; Farhat, C.
• Is Part Of: International journal for numerical methods in engineering. Volume 117:Number 7(2019)
• Page Start: 819
• Page End: 843
• Publication Date: 2018-11-14
• Subjects: machine learning -- model reduction -- model‐form uncertainties -- nonparametric probabilistic method -- probabilistic learning -- uncertainty quantification; Numerical analysis -- Periodicals; Engineering mathematics -- Periodicals; 620.001518
• DOI: 10.1002/nme.5980
• Languages: English
• ISSNs: 0029-5981

Abstract

Summary: Recently, a novel nonparametric probabilistic method for modeling and quantifying model‐form uncertainties in nonlinear computational mechanics was proposed. Its potential was demonstrated through several uncertainty quantification (UQ) applications in vibration analysis and nonlinear computational structural dynamics. This method, which relies on projection‐based model order reduction to achieve computational feasibility, exhibits a vector‐valued hyperparameter in the probability model of the random reduced‐order basis and associated stochastic projection‐based reduced‐order model. It identifies this hyperparameter by formulating a statistical inverse problem, grounded in target quantities of interest, and solving the corresponding nonconvex optimization problem. For many practical applications, however, this identification approach is computationally intensive. For this reason, this paper presents a faster predictor‐corrector approach for determining the appropriate value of the vector‐valued hyperparameter that is based on a probabilistic learning on manifolds. It also demonstrates the computational advantages of this alternative identification approach through the UQ of two three‐dimensional nonlinear structural dynamics problems associated with two different configurations of a microelectromechanical systems device.