TY - CONF A1 - Unger, Jörg F. A1 - Titscher, Thomas A1 - Robens-Radermacher, Annika A1 - Muth, Thilo A1 - Coelho Lima, Isabela T1 - Stochastische Modellkalibrierung eines digitalen Zwillings N2 - Ein Digitaler Zwilling repräsentiert ein reales Objekt in der digitalen Welt. Die Digitalen Zwillinge sind aus Daten und Modellen/Algorithmen aufgebaut und kontinuierlich über Sensoren mit der realen Welt gekoppelt. Anwendung z.B. Modellbewertung, Monitoring, Schadensdetektion. T2 - DVM-Online-Workshop "Grundlagen und Beispiele zur Digitalisierung für die Materialforschung und -prüfung" CY - Online meeting DA - 20.10.2020 KW - Modellkalibrierung KW - Stochastischen Verfahren KW - Realtime model updating KW - Demonstrator PY - 2020 AN - OPUS4-52175 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Titscher, Thomas A1 - Coehlo Lima, Isabela A1 - Unger, Jörg F. T1 - Model selection and model calibration for a digital twin N2 - The quality of a model - and thus its predictive capabilities - is influenced by numerous uncertainties. They include possibly unknown boundary and initial conditions, noise in the data used for its calibration and uncertainties in the model itself. Here, the latter part is not only restricted to uncertain model parameters, but also refers to the choice of the model itself. Inferring these uncertainties in an automatic way allows for an adaption of the model to new data sets and for a reliable, reproducible model assessment. Note that similar concepts apply at the structural level, where a continuously updated digital twin allows virtual measurements at inaccessible positions of the structure and a simulation based lifetime prediction. This work presents an inference workflow that describes the difference of measured data and simulated model responses with a generic interface that is independent from the specific model or even the geometry and can easily incorporate multiple data sources. A variational Bayesian inference algorithm is then used to a) calibrate a set of models to given data and to b) identify the best fitting one. The developed concepts are applied to a bridge Demonstrator equipped with displacement sensors, force sensors and a stereophotogrammetry system to perform a system identification of the material parameters as well as a real-time identification of a moving load. T2 - 6th GAMM AG Data Workshop CY - Berlin, Germany DA - 20.10.2020 KW - Digital twin KW - Demonstrator PY - 2020 AN - OPUS4-51532 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -