Quantifizierung und Updating von Unsicherheiten in der Beschreibung des Wärme- und Feuchtetransports in heterogenen Materialien

• Antragsteller: Professor Dr. Hermann Georg Matthies
• Fachliche Zuordnung: Mechanik ; Sicherheit und Verlässlichkeit, Betriebs-, Kommunikations- und verteilte Systeme
• Förderung: Förderung von 2009 bis 2015
• Projektkennung: Deutsche Forschungsgemeinschaft (DFG) - Projektnummer 162182726

• Erstellungsjahr: 2014

Zusammenfassung der Projektergebnisse

The project focused on probabilistic methods for the description of heterogeneous materials, which can be used for the quantification of uncertainty in the structural response, or for the identification of structural model parameters given noisy measurement data. The propagation of uncertainty through the forward model is achieved in an efficient and adaptive way by using stochastic Galerkin procedures. By using these methods we achieved to substitute the computationally expensive forward model with the faster functional approximation variants–the so called proxy model. The introduction of the proxy model to the Bayesian inference has opened new ways to the computation of the posterior. With the help of functional approximation of the considered random variables (fields), we achieved to rewrite the Bayesian inference in terms of projections onto a generalised polynomial chaos basis. In this manner we developed a fully deterministic method to compute sequential updates of stochastic estimates given noisy measurements. Being irrelevant to the type of distribution for either data or measurement this method has shown to be an extensive generalisation of the Kalman type of estimates, especially when higher order terms of the prediction mismatch are taken into account.

Projektbezogene Publikationen (Auswahl)

• Parameter Identification in a Probabilistic Setting. Engineering Structures, 50: 179–196, 2013
  B. Rosić, A. Kučerová, J. Sýkora, O. Pajonk, A. Litvinenko and H. G. Matthies
  (Siehe online unter https://dx.doi.org/10.1016/j.engstruct.2012.12.029)
• A Deterministic Filter for Non-Gaussian Bayesian Estimation - Applications to Dynamical System Estimation with Noisy Measurements. Physica D: Nonlinear Phenomena, 241(7): 775–788, 2012
  O. Pajonk, B. Rosić, A. Litvinenko and H. G. Matthies
  (Siehe online unter https://doi.org/10.1016/j.physd.2012.01.001)
• Acceleration of Uncertainty Updating in the Description of Transport Processes in Heterogeneous Materials. Journal of Computational and Applied Mathematics, 236(18): 4862-4872, 2012
  A. Kučerová, J. Sýkora, B. Rosić and H. G. Matthies
  (Siehe online unter https://doi.org/10.1016/j.cam.2012.02.003)
• Sampling Free Bayesian Update of Polynomial Chaos Representations. Journal of Computational Physics, 231 (17): 5761-5787, 2012
  B. Rosić, A. Litvinenko, O. Pajonk and H. G. Matthies
  (Siehe online unter https://doi.org/10.1016/j.jcp.2012.04.044)
• Identification of Properties of Stochastic Elastoplastic Systems. In Computational Methods in Applied Sciences: Computational Methods in Stochastic Dynamics, M. Papadrakakis, G. Stefanou, and V. Papadopoulos (Eds.), 26: 237–253, Springer, Dordrecht, 2013
  B. Rosić and H. G. Matthies
  
• Sampling-free Linear Bayesian Updating of Model State and Parameters Using a Square Root Approach. Computers and Geosciences, 55:70-83, 2013
  O. Pajonk, B. Rosić, and H. G. Matthies
  (Siehe online unter https://dx.doi.org/10.1016/j.cageo.2012.05.017)