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 6 of 6 for “"Bloch-wave"”.
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Influence of geometric parameters on 3D periodic lattice effective properties
… numerical methods are crucial. Specifically, the Bloch-wave homogenization approach allows one to characterize the effective static properties of the lattice unit cell while simultaneously analyzing wave propagation properties. While this analysis has been used for some time, a thorough study of …
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Resonance and double negative behavior in metamaterials
… intervals imply the existence of propagating Bloch waves inside sub-wavelength structures. The branches of the dispersion relation associated with Bloch modes are shown to be explicitly determined by the Dirichlet spectrum of the high dielectric phase and the generalized electrostatic spectra …
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Ruga mechanics of composite media with soft inclusions
… with local modes of instability. Through Bloch wave analysis it is observed that due to the complex deformation modes of buckled fibrils with soft inclusions widening band-gaps that are proportional to the prescribed load emerge. The findings presented in this thesis provide alternatives …
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Acoustic Metamaterials at the Microscale
… resulting from Bragg scattering occurs at wavelengths which are dictated by the characteristic dimensions of the metamaterials, while local resonance remains wavelength-independent. Therefore, micro-architected materials have the potential to allow control of mechanical waves both at high …
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Electron tomography of defects
… intensity may be from changes to TDS from Bloch wave transitions at the dislocation; assessing this as a function of tilt is for further work. On simple assessment, only three possible axial channeling orientations were found over the tilt range for GaN; if this is typical, dechanneling …
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An Investigation on Acoustic Metamaterial Physics to Inspire the Design of Novel Aircraft Engine Liners
Attenuation of low frequency turbofan engine noise has been a challenging task in an industry that requires low weight and tightly-packed solutions. Without innovative advancements, the technology currently used will not be able to keep up with the increasingly stringent requirements on aircraft …