Sökning: "Surrogate modeling"

Visar resultat 1 - 5 av 20 avhandlingar innehållade orden Surrogate modeling.

1. 1. Computer Modeling of HCCI Combustion

   Författare :Roy Ogink; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; detailed-chemistry; surrogate fuel; homogeneous charge compression ignition; internal combustion engines; modeling; HCCI; gasoline; auto-ignition; combustion;

   Sammanfattning : During the last decade an alternative to conventional internal combustion engines, i.e. spark-ignited and Diesel engines, has been under investigation by an ever-increasing number of research groups. LÄS MER

3. 2. Offshore renewable energy systems : Quantification of extreme loads using computational methods

   Författare :Eirini Katsidoniotaki; Malin Göteman; Alison Raby; Uppsala universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; offshore systems; wave energy; CFD; extreme events; machine learning; Bayesian experimental design; active learning; surrogate modeling;

   Sammanfattning : This Ph.D. thesis investigates the dynamic response of offshore energy systems in extreme waves. The use of offshore energy technologies, such as wave energy systems and offshore wind turbines, is crucial for transitioning to clean energy and mitigating the effects of climate change. LÄS MER

4. 3. MELCOR Capability Development for Simulation of Debris Bed Coolability

   Författare :Yangli Chen; Weimin Ma; Michael Buck; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Severe accident; coolability; MELCOR; COCOMO; surrogate modeling; coupling codes; uncertainty analysis.; Kärnenergiteknik; Nuclear Engineering;

   Sammanfattning : The severe accident management (SAM) strategy for a Nordic boiling water reactor (BWR) employs cavity flooding prior to vessel failure, so that the core melt (corium) discharged from the vessel could fragment and form a particulate debris bed. The key to the success of this SAM strategy is the coolability of ex-vessel debris beds. LÄS MER

5. 4. System identification of large-scale linear and nonlinear structural dynamicmodels

   Författare :Vahid Yaghoubi Nasrabadi; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Finite element model; Surrogate modeling; Bootstrapping; Polynomial chaos expansion; System identification; Exponential integration; Uncertainty quantification;

   Sammanfattning : System identification is a powerful technique to build a model from measurement data by using methods from different fields such as stochastic inference, optimization and linear algebra. It consists of three steps: collecting data, constructing a mathematical model and estimating its parameters. LÄS MER

7. 5. Modeling the economics of prevention

   Författare :Peter Lindgren; Karolinska Institutet; Karolinska Institutet; []
   Nyckelord :Cardiovascular disease; diabetes mellitus; prevention; health economics;

   Sammanfattning : Cardiovascular disease, particularly coronary heart disease and stroke, is the most common cause of death world wide, with a prevalence that is expected to increase. The consequences of the modern lifestyle such as obesity and physical inactivity are also associated with the risk of developing diabetes, another risk factor for the development of cardiovascular disease. LÄS MER