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 8 of 8 for “"Floquet Analysis"”.
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Finescale abyssal turbulence: sources and modeling
… through direct numerical simulations (DNS) and Floquet analysis. Turbulence is sustained throughout the tidal period in the DNS on extra-critical slopes characterized by small slope Burger numbers, leading to the formation of turbulent stratified Stokes-Ekman layers. Floquet analysis suggests …
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Analysis and design of linear-to-circular polarising reflector antennas exploiting periodic metallodielectric arrays
… first part of the thesis is concerned with the analysis of single reflector antennas, focusing on their depolarisation properties. MATLAB® codes are developed to obtain the far-field from the reflector and are successfully compared against the preferred tool in the market for the analysis and …
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Stability of nonlinear oscillatory systems with application to ship dynamics
… The procedure is based on the application of Floquet analysis to determine the stability of second-order perturbation approximations of the solutions of the system in the neighborhoods of specific resonances. As a control parameter is varied, a combination of elementary concepts of bifurcation …
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Rotational locks for gravity gradient satellites
… and their variational stability investigated by Floquet analysis. The results which are presented on stability charts show that for satellites that deviate appreciably from axial symmetry, the stable periodic solutions occur at eccentricities which tend to increase as the absolute value of the …
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Response of a parametrically-excited system to a nonstationary excitation
… governing equation is examined through a Floquet analysis. The response to a nonstationary excitation having (a) a frequency that varies linearly with time, or (b) an amplitude that varies linearly with time, is studied. The response is computed from digital computer integration of the …
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An Analytical Investigation of Flapping Wing Structures for Micro Air Vehicles
… this need. A time-periodic assumed-modes beam analysis of a flapping, flexible wing undergoing linear deformations is developed from a beam analysis of a helicopter blade. The resultant structural model includes bending and torsion degrees of freedom. The model is non-dimensionalized. The ratio …
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Studies on secondary instabilities
… of a spectral collocation method Following Floquet theory, previous analysis looked for subharmonic (wavelength 2 λ) and fundamental (wavelength λ) types of solutions. We extend the Floquet theory to solutions having arbitrary wavelengths, hence including the previous solutions as special …
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Dynamical System Representation and Analysis of Unsteady Flow and Fluid-Structure Interactions
… approximation of the unsteady aerodynamics. The analysis showed a new stability region that could not be determined under the assumption of a quasi-steady flow. In the third chapter, I implement the unsteady vortex lattice method to quantify the effects of tail flexibility on the propulsive …