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 14 of 14 for “"Small Disturbance"”.
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A multidomain pseudospectral solution for the general-frequency unsteady transonic small disturbance equation
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1989.
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An investigation into the capabilities of three simulation tools for small-disturbance stability analysis
… of three power system simulation tools for small-disturbance angle stability analysis, namely PST, MatNetEig and CPAT Computers today have become fast, efficient with high memory capacities and advanced in data processing capabilities. Many power system simulation tools are available on the …
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Characterization of turbine rim seal flow and its sealing effectiveness
… however, lead to ingestion with the ratio of disturbance wavelength to the trench depth emerging as a key parameter. Varying rotational speed alone does not drive ingestion as a stagnation point is formed on the outer shroud that is ingestion resistant. It is shown that excitation at …
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Theoretical And Computational Study of Steady Transonic Flows of Bethe-Zel\'dovich-Thompson Fluids
… the single phase regime. We derive the transonic small disturbance equation (TSDE) capable of capturing the qualitative behavior of BZT fluids. The shock jump conditions, and shock existence conditions consistent with the derived TSDE are presented. The flux function is seen to be quartic in the …
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Development of 3-phase inverter with PID voltage control
… to a variety of loads and able to mitigate any small disturbance in the system. PID controller is chosen for this project because the PID controller can solve a very complex control for nonlinear element. The PID controller is developed in Matlab Simulink simulation and coded into TMS320F28335 …
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Designing Active Control Laws in a Computational Aeroelasticity Environment
… in this dissertation solves the transonic small disturbance equation using a time-accurate, finite-difference scheme. Linear structural dynamics equations are integrated simultaneously with the computational fluid dynamics equations to determine the time responses of the structural outputs. …
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Stability of flows in channels
… the "WKB' method in which regions of growth of a small disturbance to the basic flow and regions of decay were determined. A modification of this method was employed by some authors as a distinct improvement on quasi-parallel theory which provides the formal lowest-order growth rates but is …
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Design and Control Considerations for a Skid-to-Turn Unmanned Aerial Vehicle
… target drone that is intended to simulate a small aircraft threat. However, in the interest of increasing functionality, enabling NXT to accomplish wings level skidding turns provides the basis for a UAV that can simulate a threat from a missile. Research was conducted to investigate the …
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Efficient and robust design optimization of transonic airfoils
… in transonic flow based on the transonic small-disturbance (TSD) and Euler equations. A sequential approximation optimization technique was implemented for solving the design problem of lift maximization with wave drag and area constraints. A simple linear approximation was utilized for …
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Dynamic Stability of Uncertain Laminated Beams Subjected to Subtangential Loads
… stability is studied by giving the structure a small disturbance about an equilibrium configuration, and observing if the resulting response remains small. In order to study the dynamic behavior by including uncertainties into the problem, three models were developed: Exact Monte Carlo …
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Transonic aeroelastic analysis of systems with structural nonlinearities
… been obtained by solving the unsteady Transonic Small Disturbance ( TSD ) flow equation using finite-difference techniques. An Alternating Direction Implicit ( ADI ) algorithm was used for two-dimensional flow model, and an Approximate Factorization ( AF ) algorithm was used for three-dimensional …
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ON GLOBAL LINKAGES OF ECONOMIES AND ECONOMIC INTEGRATION IN LATIN AMERICA
… world to another just in the blink of an eye. A small disturbance in USA for instance can create ripples and tides at the same time all over the world. The European integration has been a successful and an iconic example of economic integration in other regions. This dissertation consists of …
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Axisymmetric and non-axisymmetric modes of instability for flow between rotating cylinders with a transverse pressure gradient
… case where the annulus between the cylinders is small and the numerical results are confined to the case where the outer cylinder is stationary. In considering the stability of such a system one seeks to determine the reaction of the system when subjected to small disturbances. If the …
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Modeling, control and stability analysis of VSC-HVDC links embedded in a weak multi-machine AC system.
… primary aim of this thesis is to investigate the small-signal dynamic performance of high voltage direct current (HVDC) transmission links based on voltage source converter (VSC) technology operating in parallel with the existing longitudinal Australian power system. This thesis presents the …