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 26 for “"Cross sectional shape"”.
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Flying snakes: Aerodynamics of body cross-sectional shape
… its entire length as a reconfigurable wing. Its cross-sectional shape transforms into a thick, airfoil shape with a concave ventral surface, outwards protruding lips at the leading and trailing edges, a somewhat triangular dorsal surface with a round apex, and fore-aft symmetry. This study …
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2-D CFD design of the cross-sectional shape of arterial stents
… is implemented. A paramaterization of the cross- sectional shape of the stent wire using Hicks-Henne functions is described. The strategies used in the commercial optimization software, DAKOTA, to minimize the cost equation are described. The solver is validated using well known fluid flow …
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Performance of RC Bridge Columns under Cyclic Combined Loading including Torsion
… ratio of torsion-to-bending moment (T/M), (ii) cross sectional shape, and (iii) transverse reinforcement configurations. The torsional and flexural hysteretic responses, plastic hinge formation, strength and stiffness degradation, rotation and displacement ductility limits, energy dissipation …
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Feasibility of helically stiffened construction for a formula racing car structural shell
… deformation behavior of circular and square cross-section shells is analyzed as an approximation to the real car structure. Shells with different sandwich and helically stiffened configurations are analyzed with finite elements. For closed square and circular cross-section shells, the highest …
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Direct laser sintering of stainless steel : thermal experiments and numerical modelling
… Manufactured scans are found to have a variable cross-sectional shape, whereas the cross-sectional shape of modelled scans does not change. Modelled parts are found to be significantly smaller than manufactured parts. Reasons for these two differences are suggested.
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Shock wave interaction in a tee junction
… shock strength. Two tee junctions of different cross-sectional shape were constructed, and instrumented with three piezoelectric pressure transducers and two hot wire anemometers. Tests were run in air for a Mach number range of 1.5 to 3.0, the different pressure ratios being obtained by varying …
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STUDY OF THE LOADING OF PILES USING A SEMI-ANALYTICAL METHOD AND THE DIGITAL IMAGE CORRELATION TECHNIQUE
… finite difference method. The piles can have any cross-sectional shape, and the soil profiles can comprise as many layers as needed. The pile and soil materials are assumed linear elastic. Analysis results are in a good agreement with results from the finite element method (FEM), with the …
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A ray tracing investigation of light trapping due to grooves in solar cells
… Our objective was to determine the optimal cross-sectional shape by using Zemax, a ray-tracing program that models light striking the cell. Solid Models of the solar cell with different texturing schemes were created, and then imported to Zemax where optical properties were modeled. Using a …
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Crash behavior of three dimensional thin-walled structures under combined loading
… several new design concepts of strengthening "S" shaped frame with regard to weight efficiency and energy absorption are proposed. The mechanics of biaxial bending collapse and the collapse under combined bending and compression of thin-walled prismatic member are formulated and initial and …
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A Survey on the Microscopical and Chemical Analysis of Synthetic Wig Fibers
… sign of elongation. Feature vectors based upon cross-sectional shape and color were compared using cosine similarity measurements to show the high discrimination potential of these two characteristics. Fourier Transform infrared spectroscopy (FTIR) confirmed modacrylic to be the most popular …
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The generalised beam theory with finite difference applications
… and twisting) i. e. the member retains its cross sectional shape without distortion. In a hot rolled member the warping stresses which arise due to violation of the assumption that plane sections remain plane can often be neglected. In thin walled sections, however, these warping stresses …
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Towards a better interpretation of bone morphology: The effect of obesity on bone
… linear measurements (LM), geometric morphometric shape analysis (GMSA) and cross sectional shape analysis (CSSA). LM, GMSA and CSSA were performed on a set of 18 landmarks representing the overall shape of the right femur, using the MorphoJ package and Avizo 9.0 software. Cross-sections were …
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A Clearer Picture of Musculoskeletal Disorders of the Knee and Thumb Through the Lens of Image-Based Finite Element Analysis
… design parameters such as handle diameter, cross-sectional shape, and other features. The third goal of this work was to utilize the modular MRI-compatible micropipette simulator to analyze the effects of three handle diameters (12 mm, 25 mm, and 40 mm) and finger rest inclusion on basilar …
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Systematics and taxonomy of polyclad flatworms with a special emphasis on the morphology of the nervous system
… of the CNS probably were related to the body shape and behavior of the species, three categories could be established. These categories were based on the presence and development of globuli cell masses, the cross-sectional shape of the main nerve cords, and the tissue type surrounding the …
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Physical mechanisms of control of gliding in flying snakes
… flatten their body to make a roughly triangular cross-sectional shape to produce lift and gain horizontal acceleration. Also, the snakes assume an S-like posture and start to undulate by sending traveling waves down the body. The present study aims to answer how the snakes are able to control …
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Investigation of hydrologic and sediment transport processes on riparian hillslopes
… with slope gradient. Distributions of catchment shape revealed that catchment shape elongates with increasing gradient. Distributions of drainage channel cross-sectional shape data showed a decreasing trend in width to depth ratio with increasing slope gradient. These results indicate that …
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The Method of Constructal Design in Heat Exchangers
… search for the optimal geometry of flow channel cross-sections that meet two objectives simultaneously: reduced resistances for heat transfer and fluid flow. Two elemental cross-sections are considered, squared and equilateral triangular. The results show that the two objectives are best met when …
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Numerical Constitutive Models of Woven and Braided Textile Structural Composites
… is described by the sine function, and that the cross-sectional area of a yarn and the thickness of a yarn, normal to the centerline, are uniform along the centerline. For the balanced plain weave architecture, equations for the fiber volume fraction and the cross-sectional shape of the yarn are …
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Application of evolutionary computation to open channel flow modelling
… a free overfall is exampled for a variety of cross section shapes. In total, 18 datasets representing 1373 experiments were interrogated. It was found that an expression of form \(h_c\)=A\(h_e\)\(^{B\sqrt S_o}\), where \(h_c\) is the critical depth, \(h_e\) is the depth at the brink, \(S_o\) …
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Micromechanical Modelling of Wood and Fibre Properties
… unaltered fibres of simplified geometrical shape was also studied in a preliminary way by means of micromechanical modelling. Three-dimensional finite element models of straight fibres of undeformed and of collapsed cross-sectional shape were involved. Both the force-displacement …
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