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 55 for “"Perturbation Analysis"”.
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Singular-perturbation analysis of climb-cruise-dash optimization
The method of singular-perturbation analysis is applied to the determination of range-fuel-time optimal aircraft trajectories. The problem is shown to break down into three sub-problems which are studied separately. In particular, the inner layer containing the altitude path-angle dynamics is …
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Interlaminar stresses in composite laminates: a perturbation analysis
… extension has been developed based upon a perturbation analysis of a limiting free body containing an interfacial plane. The solution satisfies more physical requirements and boundary conditions than previous investigations, predicts smooth continuous interlaminar stresses with no …
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Analysis of Perturbation-based Testing Methodology as applied to a Real-Time Control System Problem
Perturbation analysis is a software analysis technique used to study the tail function of a program by inserting an error into an executing program using data state mutation. The impact of this induced error on the output is then measured. This methodology can be used to evaluate the effectiveness …
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Steady State Modeling and Dynamic Analysis of Film Blowing
Perturbation analysis, which has never been applied to film blowing, was used to explore the effect of system disturbances on the process. Results showed that perturbations related to heat transfer and inflation pressure were more significant than the effect of die swell. In addition, crystallinity …
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Active Control of a Cable -Stayed Bridge Against Earthquake Excitations
… those of the LQG and H2 designs. A stiffness perturbation analysis was also completed. The time and frequency responses showed no signs of instability for perturbations of +/-7%. Therefore, it was concluded that the mu-tools-based controller would perform well.
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The Solution of a Parabolic Partial Differential Equation via Domain Decomposition: The Synthesis of Asymptotic and Numerical Analysis
… decomposition that is dictated by singular perturbation analysis. The analysis is used to determine regions where certain reduced equations may be solved in place of the full equation. Parallelism is evident at two levels. Domain decomposition provides parallelism at the highest level, and …
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Estudo analítico da convecção natural junto a uma placa inclinada para números de Prandtl baixos
The present work performs a perturbation analysis of laminar free convection about an inclined isothermal plate, using the classical boundary layer solution as the zeroth-order perturbation. The analysis is extended to second-order perturbations and the effects of the additional terms considered in …
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Computer simulation of finite amplitude standing waves in rigid-walled ducts.
… data, to agree with the Coppens-Sanders perturbation analysis, and to extend the theoretically describable regime closer to strengths leading to the formation of the shock front.
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The temperature distribution on a rotating cylindrical shell in the presence of a primary radiative source and a reflecting and radiating infinite plane
… The non-linear problem is approximated through a perturbation analysis to obtain a linear problem. The solution to the linear equation is found by the Green's function technique. Then some numerical results are obtained for variations in the non-dimensional parameters.
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Triad Interactions among Surface Waves Propagating through an Ice Sheet
… a thin floating ice sheet. Using multiple-scale perturbation analysis verified against regular perturbation for short distances past the ice edge, we obtain theoretical predictions of the wave amplitude evolution as a function of distance travelled past the ice edge for a semi-infinite ice sheet. …
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Nonlinear dynamics in power systems
We use a perturbation analysis to predict some of the instabilities in a single-machine quasi-infinite busbar system. The system’s behavior is described by the so-called swing equation, which is a nonlinear second-order ordinary-differential equation with additive and multiplicative harmonic terms …
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Type-C wind turbine model order reduction and parameter identification
… or needlessly complex. Through use of singular perturbation analysis, this research shows that under normal system operating conditions the power injected in the network by a Type-C wind turbine generator (WTG) can be described by a first-order nonlinear dynamical model that relates the WTG …
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Application of optimization techniques to the design and maintenance of satellite constellations
… maintain stability, even when subjected to full perturbation analysis. The global optimization technique of parallel genetic algorithms was also used to create an optimization approach capable of maintaining the designed orbits over specified lengths of time. Although the global method proved …
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Design of multidimensional radiofrequency pulses in magnetic resonance imaging
… methods. In addition, we have performed a perturbation analysis to investigate the effects of B1 mapping errors on excitation accuracies in parallel excitation. A closed-form solution of the perturbations on the excitation patterns caused by B1 mapping errors is derived by locally …
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Exploiting insensitivity in stochastic systems to learn approximately optimal policies
… How sensitive is the obtained control policy to perturbations? These are the central questions addressed in this dissertation. For most real-world robotic systems, the state of the system is observed only indirectly through limited sensor modalities. Since the actual state of the robot is not …
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Viscous-inviscid interaction for incompressible flows over airfoils
… procedure. This procedure is derived from a perturbation analysis of the linearized versions of the governing equations. The resulting method is subjected to a stability analysis, which shows that it will break down when used in conjunction with separated-flow boundary-layer solvers. The …
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Analysis of Acceleration Techniques and Fast Nonlinear Solvers
This dissertation focuses on the analysis and development of acceleration techniques and fast solvers for nonlinear systems of equations. Building upon the fixed-point and extrapolation frameworks introduced in the early chapters, we explore structural connections between residual-based …
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Cellular automata models for excitable media
… for the diffusion component and on singular perturbation analysis for the reaction component. The cellular automaton is used to model spiral waves in the Belousov-Zhabotinskii reaction. The behavior of the spiral waves and the movement of the spiral tip are analyzed. By comparing these …
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Rotationally Resolved Laser Spectroscopy of the 3s2Σ+ ← 2p2II Transition in 6Li20Ne and 7Li20Ne Van Der Waals Molecules
… states have been obtained through an inverse perturbation analysis. For the 2p<sup>2</sup>II state, a well depth of 212(5) cm<sup>-1</sup> and an equilibrium separation of 4.36(2) a,, have been obtained. Analysis of the 3s<sup>2</sup>Σ<sup>+</sup> electronic state has revealed a barrier …
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