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 20 of 22 for “"wing shape"”.
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Evolution of the ZRS and the Regulation of SHH Expression in the Forelimbs of Bats.
… and Rhinolophus clivosus (which have different wing shapes) was linked to a β-globin-LacZ reporter construct and used in transgenic mice experiments. A mouse ZRS with bat mutations as well as a wild type mouse ZRS (the control) were also tested. Transgenic results suggest that the bat ZRS has …
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Design, Development, and Analysis of a Morphing Aircraft Model for Wind Tunnel Experimentation
Morphing aircraft combine both radical and subtle wing shape changes to improve vehicle performance relative to a rigid airframe. An aircraft wind tunnel model with considerable wing-shape freedom can serve as a tool in learning to model, control, and fully exploit the potential of such vehicles. …
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Variation in wing area and prey detection volume of Rhinolophus Capensis in response to different climates
Wing shape and echolocation are two novel adaptations in the Chiroptera and are strongly influenced by environmental conditions. Wing shape is influenced by environmental clutter. Shorter, broader wings allow for more maneuverable flight, and are advantageous for bats living in highly cluttered …
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Adaptive output-feedback control and applications to Very Flexible Aircraft
… dynamics critically depends on its flexible wing shape, and has been investigated as a potential solution to generate high-altitude low-endurance flights. The dominant presence of model uncertainties and potential actuator anomalies motivate an adaptive approach for control of VFA. Another …
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Wing flexibility and design for animal flight
The wings of flying animals change shape dramatically during flight, yet the control and effects of these shape changes have received little attention. In Chapter 1, I discuss the potential effects of wing flexibility and dynamic shape changes in flying vertebrates (who can actively control wing …
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Optimal Design and Analysis of Bio-inspired, Curvilinearly Stiffened Composite Flexible Wings
Large-aspect-ratio wings and composite structures both have been considered for the next-generation civil transport aircraft to achieve improved aerodynamic efficiency and to save aircraft structural weight. The use of the large-aspect-ratio and the light-weight composite wing can lead to an …
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Geometric Trimming and Curvature Continuous Surface Blending for Aircraft Fuselage and Wing Shapes
… for surface blending of an aircraft fuselage shape and a wing shape at a closed trimming intersection curve, and verifies the properties of the newly created surface. In order to distinguish how well the new surface approximates the original, an error comparison tool developed in MATLAB has …
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Phylogenetic Relationships and Character Evolution of the Neotropical Butterfly Genus Hamadryas (Nymphalidae: Biblidinae)
… associated with an specific behaviour on wing shape. Furthermore, this dissertation provides testable evolutionary hypotheses about the pattern of change for some of their most interesting natural history characters such as sound production and sexual dimorphism. The dissertation is …
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The function of chromatin regulators during patterning and growth in Drosophila wing disc regeneration
… in response to ablation in Drosophila imaginal wing discs, which was induced through a temporally and spatially controllable genetic ablation system, to determine how chromatin regulators regulate the changes in gene expression. Many of these genes are indeed important for promoting or …
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Multidisciplinary optimization of high-speed civil transport configurations using variable-complexity modeling
… transport (HSCT). Methods to parameterize the wing shape, fuselage shape and nacelle placement are described. Variable-complexity design strategies are used to combine conceptual and preliminary-level design approaches, both to preserve interdisciplinary design influences and to reduce …
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Local adaptation of Geoffroy's horseshoe bat, Rhinolophus clivosus, to the Cape floristic region of South Africa
… allometric responses in flight morphology. The wing shape of R. clivosus at De Hoop has not changed, resulting in a reduction in wing loading with a consequent increase in manoeuvrability. Thus R. clivosus at De Hoop is simply a scaled-down version of R. clivosus elsewhere and a scaled-up …
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Position and strain feedback control for shaping an active truss
… is to aid the evaluation of active airfoil and wing shape control using an active truss. This specific research addresses the effect of replacing position feedback with strain feedback for shape control of an active truss. There are two research objectives: a comparison of multiple-beam shape …
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An experimental study of the relationship between velocity and pressure fluctuations in a wing-body junction
… tunnel in the plane of symmetry in front of a wing-body junction at an approach free-stream velocity U<sub>ref</sub>=28.3 m/s and momentum thickness Reynolds number Re<sub>θ</sub>=6900. The cylindrical wing shape was a 3:2 elliptic nose attached to a NACA 0020 tail at maximum thickness. A two …
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Interference Drag Due to Engine Nacelle Location for a Single-Aisle, Transonic Aircraft
… of the interference drag between nacelles and wing-fuselage systems suitable for the inclusion in a multidisciplinary design optimization (MDO) framework. The target aircraft was a single-aisle, transonic aircraft with a freestream Mach number of 0.8 at 35,000 feet and a design lift coefficient …
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A Hybrid Optimization Framework with POD-based Order Reduction and Design-Space Evolution Scheme
… Environment (M3 DOE), in context of aircraft wing optimization. M3 DOE provides the user a capability to optimize configurations with a choice of (i) the level of fidelity desired, (ii) the use of a single-step or multi-step optimization strategy, and (iii) combination of a series of …
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Adaptation to altitude in Heliconius butterflies
… genus. Firstly, using a collection of over 3500 wings I discovered that wing morphology varies predictably across elevations, with species and populations in the highlands having rounder wings than those in the lowlands. This study also highlighted that life-history, whether larvae are gregarious …
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Scaling Bayesian optimization for engineering design : lookahead approaches and multifidelity dimension reduction
… illustrate the proposed algorithm on an ONERA M6 wing shape-optimization problem.
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Aspects of infraspecific phylogeography of Calopteryx splendens
… Asia. There is great variation among males in wing coloration. Traditionally subspecific taxa have been distinguished by the size and position of the pigmented wing spot, and by (mating) behavior. About a dozen of subspecies have been recognized. Calopteryx splendens splendens; C. s. …
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