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 7 of 7 for “"eigenmode analysis"”.
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A numerical eigenmode analysis of the progressive buckling of thin-walled tubes
[page 76 missing]Structural impact is concerned with the behaviour of structures subject to static and dynamic loads which produce inelastic deformations. This field is of particular interest for the crash-worthiness design of aeroplanes, motor cars, buses, trains, ships and marine structures, …
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Methodologies and Algorithms for Finite Element Analysis of Electromagnetic Devices and Systems
… are presented for two-dimensional waveguide eigenmode analysis, which provides the foundation for the development of a waveguide-mode based port excitation model. This model is used in the multiple-input, multipleoutput finite element analysis of multiport electromagnetic devices and, in …
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Photoexcited hypersonic surface acoustic waves propagating under periodic metal grating
… Further, we conduct finite element based eigenmode analysis on the Si-Al periodic composite which show a good agreement with the experimental data. Modal analysis further reveals that higher attenuation in the duty cycle regime 0.3 to 0.6 is due to radiation of the energy from the surface …
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Distributed Energy Dynamics Control for Stable Power Electronic-Enabled Electric Power Systems
… approaches, rooted in quasi-static phasor analysis and centralized architectures, inadequate for ensuring stability and scalability. This thesis adopts an energy space modeling approach grounded in first principles of energy conservation and system interconnection. It extends the previously …
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Magnetic Stability Analysis for the Geodynamo
… workers have applied eigenvalue stability analysis and although in some cases Earth-like solutions have been found, the results hinge critically on the precise choice of flow. We therefore cannot attribute physical mechanisms in such cases since it is rather case dependent. Following the …
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Ultra-low frequency wireless transmitter design using resonant oscillating permanent magnets
… in a multi-degree-of-freedom resonator. Eigenmode analysis establishes the resonator configuration necessary to achieve synchronous motion of the rotors. Calculations show that the in-phase mode has the highest eigenfrequency, and optimum mode shape can be achieved by tuning the …
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Frequency Response Modeling of Additive Friction Stir Deposition Parts with Print Defects
A change in a part's response to vibrations can be measured and utilized as a non-destructive testing method to detect deviations in the part's materials or geometry through processes such as laser acoustic resonance spectroscopy. This work focuses on leveraging vibration resonance to detect flaws …