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Automated Design Of A High-Velocity Channel, Jacqueline Pettway Hallberg
Automated Design Of A High-Velocity Channel, Jacqueline Pettway Hallberg
Theses and Dissertations
Engineering design is a decision-making process. Optimization techniques can be used to insure that better decisions are made. One design of great interest to engineers is that of high-velocity channels used for routing floodwater out of urban areas. In the design of these channels it is very important to avoid such hydraulic phenomena as standing waves, hydraulic jumps, and shocks. These will require higher wall heights and more expense. These channels can be modeled with physical models, but they are expensive and time consuming. To minimize the cost of building and changing the physical models and the time required to …
Quasi 3d Multi-Stage Turbomachinery Pre-Optimizer, Chad Eric Burdyshaw
Quasi 3d Multi-Stage Turbomachinery Pre-Optimizer, Chad Eric Burdyshaw
Theses and Dissertations
A pre-optimizer has been developed which modifies existing turbomachinery blades to create new geometries with improved selected aerodynamic coefficients calculated using a linear panel method. These blade rows can then be further refined using a Navier-Stokes method for evaluation. This pre-optimizer was developed in hopes of reducing the overall CPU time required for optimization when using only Navier-Stokes evaluations. The primary method chosen to effect this optimization is a parallel evolutionary algorithm. Variations of this method have been analyzed and compared for convergence and degree of improvement. Test cases involved both single and multiple row turbomachinery. For each case, both …
Identification Of Preferred Operational Plan Force Mixes Using A Multiobjective Methodology To Optimize Resource Suitability And Lift Cost, David J. Wakefield Jr.
Identification Of Preferred Operational Plan Force Mixes Using A Multiobjective Methodology To Optimize Resource Suitability And Lift Cost, David J. Wakefield Jr.
Theses and Dissertations
AFIT research in support of the Advanced Logistics Project is directed at developing a Mission-Resource Value Assessment Tool for rationally assigning relative value to resources and identifying alternative force mixes to logistics and operational planners. Research of factors that affect force mix composition has been strictly limited to how the operating environment of USAF combat aircraft influences their performance in specified aerospace missions. In contrast, this research makes use of an aircraft's designed suitability to perform specified aerospace missions in order to examine the tradeoff between mission suitability and the amount of lift needed to deploy and operate the asset. …