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 764 for “"closed-form"”.
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The closed form error expression with Parseval's theorem
The closed form error expression of optimum Wiener filter was first introduced by M. C. Yovit and J. L. Jackson in 1955. Since then, a number of people have proved the validity of this form using almost similar technique but no one has succeeded to extend the Yovit-Jackson's original formula for …
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Closed form solution of the wave equation for piles
… wave equation is solved in a relatively simple closed form without recourse to numerical methods. A review of past efforts to solve the wave equation in closed form is included. Problems that appear in previous related works are discussed and derived again, including the Prescott-Laura problem …
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Numerically efficient analysis of microstrip configurations using closed-form Green's functions
… domain Green's function. The derivation of the closed-form spatial domain Green's functions for the vector and scalar potentials is presented for a microstrip geometry with a substrate and superstrate for which the thicknesses can be arbitrary. The current distributions are computed for a …
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Transformation of closed form : design projection to "inhabit" cylindrical grain containers
… architecture that reduce the built landscape to closed, object-like, discrete physical elements. The disparity in the range of sizes from large to small intensifies the discontinuity in contemporary, mid-to-high density urban environments. The design exploration entails the transformation of an …
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Closed/Semi-Closed Form Solutions for Face/Core Debonds in Sandwich Beams
… used to incorporate the effects of crack tip deformation in beam theory. In this model, EFA is extended further to better capture the effects of transverse shear. Unlike most models, this approach can be applied for both isotropic and orthotropic face & core materials. The approach uses both …
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Characterizations of and closed-form solutions for plain vanilla and exotic derivatives
… framework. Our main contribution is to derive closed-form solutions for European plain vanilla options. A further extension to displaced gamma tails is possible while retaining full analytical tractability. We propose an efficient routine to estimate the physical model parameters through …
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Deriving a Closed-Form Solution for Over-Actuated Surface Vessels with Actuator Constraints
… constraint violations. This thesis derives a closedform, limit-aware solution for a Unmanned Surface Vessel with two independent, steerable thrusters that achieves optimal accuracy with constant-time complexity. The proposed framework recasts allocation as an analytic inverse-kinematics …
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Closed-form Solutions to Robust and Optimal Control Problems of Second-Order Systems
… To overcome these challenges, we develop closed-form solutions and expressions for various control problems that offer high accuracy, scalability, and insight. We begin by proposing novel closed-form stabilizing and destabilizing solutions to the CARE for second-order systems, explicitly …
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Closed-form description of polarization in elastic and inelastic scattering of light and heavy ions
The present work is an extension of this formalism to vector and tensor polarization in elastic and inelastic scattering of spin-s particles. Moreover, it uses the improved formalism developed by Frahn for the study of elastic and inelastic scattering of heavy ions with zero spin. With regard to …
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Validation of the ULSAP Closed-Form Method for Ultimate Strength Analysis of Cross-Stiffened Panels
This thesis presents the results of 67 ABAQUS elasto-plastic Riks ultimate strength analyses of cross-stiffened panels. These panels cover a wide range of typical geometries. Uniaxial compression is applied to the panels, and in some cases combined with lateral pressure. For eight of the panels …
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Electrodynamic Green's Functions in Layered Media: Accurate Closed -Form Approximations for Both Electric and Magnetic Sources
The proposed methodology has been implemented in a computer tool suitable for the calculation of the electrodynamic Green's function in the presence of planar media composed of layers of arbitrary material composition and thickness. Special emphasis was placed on making the computer tool robust to …
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Software for analysis of three dimensional statistical tolerance propagation in assemblies using closed-form matrix transforms
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1991.
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A Closed-Form Dynamic Model of the Compliant Constant-Force Mechanism Using the Pseudo-Rigid-Body Model
… The dynamic model is cast in generalized form to represent all possible configurations of compliant constant-force mechanism. Deriving the dynamic equation from the pseudo-rigid-body model is useful because every configuration is represented by the same model, so a separate treatment is …
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Linear Parameter Uncertainty Quantification using Surrogate Gaussian Processes
… take a previous sampling algorithm and provide a closed form expression of the resulting posterior distribution. We extend the method to weighted least squares and a Bayesian approach both with closed form expressions of the resulting posterior distributions. We test methods on 1D deconvolution …
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Parametric modeling and analysis of structural bonded joints
A closed form model of a double lap bonded joint based on the Hart-Smith Model is considered. An extensional link is added to the inner adherend in order to minimize the magnitude of the shear distribution in the adhesive along the overlap length and equations are formulated for this new model. …
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Multidimensional Geometrical Signal Representation: Constructions and Applications
… alias-free sampling with the Fourier transform of the indicator function defined on the frequency support. We also derive simple closed-form expressions of these Fourier transforms for a fairly general class of support regions consisting of arbitrary N-dimensional polytopes. With these …
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