Fast model updating coupling Bayesian inference and PGD model reduction

Paul-Baptiste Rubio (1) , François Louf (2) , Ludovic Chamoin (1)

1 LMT - Laboratoire de Mécanique et Technologie
2 LMT - Laboratoire de Mécanique et Technologie

The paper focuses on a coupled Bayesian-Proper Generalized Decomposition (PGD) approach for the real-time identification and updating of numerical models. The purpose is to use the most general case of Bayesian inference theory in order to address inverse problems and to deal with different sources of uncertainties (measurement and model errors, stochastic parameters). In order to do so with a reasonable CPU cost, the idea is to replace the direct model called for Monte-Carlo sampling by a PGD reduced model, and in some cases directly compute the probability density functions from the obtained analytical formulation. This procedure is first applied to a welding control example with the updating of a deterministic parameter. In the second application, the identification of a stochastic parameter is studied through a glued assembly example.

Mots clés: Model updating; Reduced order model; Bayesian inference; PGD

Domaines: Mécanique [physics.med-ph]; Mécanique des structures [physics.class-ph]

Paul-Baptiste Rubio, François Louf, Ludovic Chamoin. Fast model updating coupling Bayesian inference and PGD model reduction. Computational Mechanics, 2018, 62 (6), pp.1485-1509. ⟨10.1007/s00466-018-1575-8⟩. ⟨hal-01774547⟩