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 110 for “"trapezoidal"”.
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Boundary shear stresses in curved trapezoidal channels
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Civil and Sanitary Engineering, 1961.
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Optimization of Trapezoidal Fin Systems With Mutual Irradiation
Made available in DSpace on 2014-12-05T19:16:02Z (GMT). No. of bitstreams: 1 6206171.pdf: 2886153 bytes, checksum: 77c31abd1dc4bc2568e591b13f3afb70 (MD5) Previous issue date: 1962
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Single phase trapezoidal AC power supplies for hybrid fiber/coax networks
… These power supplies are required to produce a trapezoidal-shaped voltage waveform. Conventional power supplies having a front-end diode bridge rectifier and a large dc bus capacitor are an unacceptable approach for this application as they draw a highly distorted current waveform resulting in a …
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Evaluation of redundancy in trapezoidal box-girder bridges using finite element analysis
The AASHTO Bridge Design specifications define a fracture-critical member as a component in tension whose failure is expected to result in the collapse of a bridge. The tension flanges of twin box-girder bridges are thus labeled as fracture-critical. In order to avoid the catastrophic collapse …
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End depth and flow relationships for smooth open trapezoidal and circular channels
… the discharge rate for smooth open channels with trapezoidal and circular cross sections. To accomplish this, the momentum equation was used. The velocity and pressure head distributions at the end depth Y$\sb{\rm e}$ were determined to obtain the corresponding velocity and pressure coefficients, …
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Investigation of a trapezoidal microchannel for hydrodynamic detachment of cells or biomolecules.
… detachment assays and NSA removal methods, a trapezoidal microchannel was investigated as a hydrodynamic method of cell or biomolecule detachment. This design utilizes the characteristic pressure-driven flow of microfluidics to detach cells or biomolecules at the narrow region of interest …
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Buckling response of symmetrically laminated composite plates having a trapezoidal planform area
… load and W(x) is the plate width which, for the trapezoidal planform, varies linearly with the lengthwise coordinate x. The out-of plane displacement is approximated by a double trigonometric series. This analysis is posed in terms of four nondimensional parameters representing orthotropic and …
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The Development and Application of a Trapezoidal Shear Panel for Use in Finite Element Codes
<p>This thesis documents the efforts of the writer and his colleagues over the past several years to improve the theoretical foundation of the arbitrary quadrilateral shear panel used in structural analysis codes to model aircraft structures. An equilibrium stress-based element with pure shear …
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Natural frequencies and an atlas of mode shapes for generally-laminated, thick, skew, trapezoidal plates
… response of generally-laminated, thick, skew, trapezoidal plates is investigated as there appears to be a lack of information in this area. In the method developed, Chebychev polynomials are used as displacement functions in the Rayleigh-Ritz method. Various edge supports are considered, and …
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Mixed-signal analog-digital circuits design on the pre-diffused digital array using trapezoidal association of transistors
… novel technique proposed is the use of TAT (Trapezoidal Associations of Transistors) composite transistors on the semi-custom Sea-Of-Transistors (SOT) array. The analysis and advantages of TAT arrangement are extensively analyzed and demonstrated, with simulation and measurement comparisons …
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Evaluation of a direct time integration scheme for dynamic analysis
… widely used direct integration schemes is the trapezoidal rule. It is favored because it is a method that requires single steps and its results are second-order accurate. However, in cases where there are large deformations and longer integration times, the trapezoidal rule fails. A new …
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Time integration schemes for piecewise linear plasticity
The formulation of a generalized trapezoidal rule for the integration of the constitutive equations for a convex elastic-plastic solid is presented. This rule, which is based on an internal variable description, is consistent with a generalized trapezoidal rule for creep. It is shown that by …
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Finite element algorithms for the static and dynamic analysis of time-dependent and time-independent plastic bodies
… schemes which include the generalised trapezoidal rule and a generalised Newton-Raphson scheme. This approach provides theoretical foundations for the generalised trapezoidal rule and the generalised Newton-Raphson scheme that have some geometrical insights as well as an interpretation …
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An analysis of the TR-BDF2 integration scheme
… our understanding of how the combined L-stable 'Trapezoidal Rule with the second order Backward Difference Formula' (TR-BDF2) integrator and the standard A-stable Trapezoidal integrator perform on systems of coupled non-linear partial differential equations (PDEs). It was originally Professor …
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3-dimensional autostereoscopic displays with 4K televisions
… by integrating a Pepper's Ghost effect (using a trapezoidal prism) with 3D integral imaging (using a lenticular array). In the MEng thesis the complexity of the illusion was increased by utilizing a cone in place of a trapezoidal prism, and a radial parallax barrier in place of a lenticular …
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Measurement Drift in 3-Hole Yaw Pressure Probes From 5 Micron Sand Fouling at 1050° C
… fouling. In this study, Wedge, Cylindrical, and Trapezoidal probes were exposed to realistic hot section turbine environments of 1050 C at 65-70 m/s. 0-5 micron Arizona Road Dust(ARD) is heated under these conditions and used to foul the yaw probes. The sand deposited on the probe was observed to …
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Multidisciplinary Analysis and Design Optimization of an Efficient Supersonic Air Vehicle
… MDO. This resulted in an optimal ESAV with a trapezoidal wing planform. The NSGA-II optimizer considered arrow wing planforms in early generations during the process, but these were later discarded in favor of the trapezoidal planform. Sensitivities around this optimal design were computed …
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