Global ETD Search
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Showing 1 to 6 of 6 for “"Model Discrepancy"”.
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Multifidelity methods for multidisciplinary design under uncertainty
… often have available many different simulation models. The output of each model has an associated uncertainty that is a result of the modeling process. This uncertainty is referred to as model discrepancy and is defined as the deviation of the model output relative to the "true" physical value. …
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Metamodel-based inverse uncertainty quantification of nuclear reactor simulators under the Bayesian framework
Mathematical modeling and computer simulations have long been the central technical topics in practically all branches of science and technology. Tremendous progress has been achieved in revealing quantitative connections between numerical predictions and real-world observations. However, because …
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Assessment of Model Validation, Calibration, and Prediction Approaches in the Presence of Uncertainty
Model validation is the process of determining the degree to which a model is an accurate representation of the true value in the real world. The results of a model validation study can be used to either quantify the model form uncertainty or to improve/calibrate the model. However, the model …
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Effect of System Dynamics on Shape Memory Alloy Behavior and Control
While the existing thermomechanical constitutive models can predict the behavior of SMA-actuated systems in most cases, in this study, we have shown that there are certain situations in which these models are not able to predict the behavior of SMAs. To this end, a rotary SMA-actuated robotic arm …
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MEASUREMENTS AND MODEL PREDICTIONS OF HYDROXYL RADICAL, PEROXY RADICALS, AND NITROUS ACID: EVIDENCE OF MISSING SOURCES OR SINKS IN FORESTED AND INDOOR ENVIRONMENTS
… disagreement between measurements and modeled concentrations of ROX. While progress has been made in improving OH agreement in deciduous forests, HO2 and RO2 model disagreement persists. Measurements of radicals spanning three forested campaigns are compared through a chemical …
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Bayesian-based simulation model validation for spacecraft thermal systems
… of space flight, spacecraft thermal system modeling software has advanced significantly, but the model validation process, in general, has changed very little. Although most thermal systems are successful, there is evidence of some model inaccuracy and thermal system overdesign due to the …