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 10 of 10 for “"Minimum Drag"”.
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Prediction and experimental evaluation of planar wing spanloads for minimum drag
… were conducted to evaluate the changes in drag as the design constraints differed. The results indicate that an optimized spanload having equal lift and wing-root bending moment to that of an elliptically-loaded wing can experience significant decreases in drag. Comparisons between the …
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Drag considerations for flight in atmospheric turbulence
… determine the combination that would produce the minimum drag for a given lift. Further, the center of gravity (CG) position which gives the desired lift distribution and at the same time, maintains aircraft trim is determined. Furthermore, a classic set of non-linear equations of motion for …
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Efficient inverse methods for supersonic and hypersonic body design, with low wave drag analysis
… of target pressure distributions, a study of minimum drag body shapes was conducted over a Mach number range from 3 to 12. Numerical results show that the power law bodies result in low drag shapes, where the n=.69 (l/d = 3) or n=.70 (l/d = 5) shapes have lower drag than the previous …
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A simulator study of the horizontal landing characteristics and piloting techniques for manned re-entry gliders
… of proposed vehicles with maximum lift to drag ratios of 3 to 5. The problem was Investigated from final approach to touchdown, In still and turbulent air, simulating longitudinal equations of motion only. A three phase landing consisting of a steady glide final approach, a nearly constant …
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Design optimization of aerodynamic drag at the rear of generic passenger cars using nurbs representation
… were performed on these geometries to obtain drag coefficients. Once the results of CFD simulations were available, a response surface model was constructed using linear regression technique. Finally, the design exploration was performed using the response surface model instead of actual CFD …
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Computational analysis of planar wings designed for optimum span-load
… Computational results indicated different drag characteristics between the three span-load optimized wings at the design CL. The Viscous Optimized Wing produced the minimum drag while the Elliptic Wing produced the largest drag at design CL. The Inviscid Optimized Wing had the largest …
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Shape optimization using feature-based CAD systems and adjoint methods
… for certain objective functions (for e.g. minimum pressure loss, minimum drag, maximum lift etc.). In this thesis, an automated optimization process is presented, which uses the parameters defining the features in a feature-based CAD model as design variables. This process exploits adjoint …
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Optimum Spanloads Incorporating Wing Structural Considerations And Formation Flying
The classic minimum induced drag spanload is not necessarily the best choice for an aircraft. For a single aircraft configuration, variations from the elliptic, minimum drag optimum load distribution can produce wing weight savings that result in airplane performance benefits. For a group of …
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Active/Passive Controls and Energy Harvesting from Vortex-Induced Vibrations
… the most effective control law that requires minimum power to achieve a desired controlled amplitude. Furthermore, we investigate, in detail, the feasibility of using a nonlinear energy sink to control the vortex-induced vibrations of a freely oscillating circular cylinder. It has been …
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Airfoil design framework for optimized boundary-layer integral parameters
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-04-12 without embargo terms