Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 7 of 7 for “"variable fidelity"”.
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Variable Fidelity Studies in Wake Vortex Evolution, Safety, and Control
<p>The purpose of this research is to develop a variable-fidelity approach for addressing the safety of unmanned aerial system (UAS) operations in the national aerospace system (NAS). This task is implemented on the basis of safety investigation toolkit for analysis and reporting wake vortex safety …
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Accelerating Monte Carlo neutron transport with variable fidelity nuclear data
… and multi-group (MG) data. CE is the highest fidelity option, since it allows each cross section resonance to be represented precisely. However, due to the need to perform lengthy binary searches and expensive memory look-ups, CE MC is normally computationally expensive. Some alternatives, …
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Efficient Global Optimization of Multidisciplinary System using Variable Fidelity Analysis and Dynamic Sampling Method
… for multidisciplinary problems. First, a fidelity-calibration method is developed and applied to lower-fidelity samples. Function values analyzed by lower fidelity analysis methods are updated to have equivalent accuracy to that of the highest fidelity samples, and these calibrated data …
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Variable Fidelity Monte Carlo Neutron Transport: On Combining Multi-Group and Continuous Energy Representation in Monte Carlo Calculations
… significant loss of accuracy, if the high fidelity CE representation is constrained to a small spatial region around an estimate of interest, while the rest of the domain is represented with a more efficient MG model. The possibility of combined MG-CE MC calculations has been suggested in …
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Design and Flight-Path Simulation of a Dynamic-Soaring UAV
… properties are captured with the integration of variable fidelity aerodynamic analyses. In addition to this, a 6 degree-of-freedom flight simulation environment is designed to include the effects of atmospheric wind conditions. A simple flight control system aids in the development of the dynamic …
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Numerical Study in Wind Energy Extraction from Controlled Limit-Cycle Oscillations in Modified Glauert Airfoil
… an MG airfoil under LCO, this thesis evaluates variable-fidelity numerical schemes. A high-fidelity implicit large eddy simulation (ILES) solver FDL3DI is employed to directly compute the flow field around the moving airfoil, and especially the effects of SJA control. For a low-fidelity tool, …
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A Hybrid Optimization Framework with POD-based Order Reduction and Design-Space Evolution Scheme
… this research is to develop an innovative multi-fidelity multi-disciplinary design, analysis and optimization suite that integrates certain solution generation codes and newly developed innovative tools to improve the overall optimization process. The research performed herein is divided into two …