Computational Scattering Models for Elastic and Electromagnetic Waves in Particulate Media

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" Computational Scattering Models for Elastic and Electromagnetic Waves in Particulate Media "

Document Type	:	Latin Dissertation
Language of Document	:	English
Record Number	:	150017
Doc. No	:	ET21809
Main Entry	:	Timothy Edwin Doyle, Doctor of Philosophy
Title Proper	:	Computational Scattering Models for Elastic and Electromagnetic Waves in Particulate Media
Note	:	This document is digital این مدرک بصورت الکترونیکی می باشد
Abstract	:	Numerical models were developed to simulate the propagation of elastic and electromagneticwaves in an arbitrary, dense dispersion of spherical particles. The scattering interactions were modeledwith vector multipole fields using pure-orbital vector spherical harmonics, and solved using the full vectorform of the boundary conditions. Multiple scattering was simulated by translating the scattered wave fieldsfrom one particle to another with the use of translational addition theorems, summing the multiple-scattering contributions, and recalculating the scattering in an iterative fashion to a convergent solution.The addition theorems were rederived in this work using an integral method, and were shown to benumerically equivalent to previously published theorems. Both ordered and disordered collections of up to5,000 spherical particles were used to demonstrate the ability of the scattering models to predict the spatialand frequency distributions of the transmitted waves.The results of the models show they are qualitatively correct for many particle configurations andmaterial properties, displaying predictable phenomena such as refractive focusing, mode conversion, andphotonic band gaps. However, the elastic wave models failed to converge for specific frequency regions,possibly due to resonance effects. Additionally, comparison of the multiple-scattering simulations withthose using only single-particle scattering showed the multiple-scattering computations are quantitativelyinaccurate. The inaccuracies arise from nonconvergence of the translational addition theorems, introducing..tested for theQ1 PC1 bus cardBoth these projects mere sofixare des elopment efforts tonards contributing to dlfferentaspects of Roboucs and lZ1echatronics projects m the Controls and Roboucs Group..
Subject	:	Electericl tess
	:	برق
electronic file name	:	TL44995.pdf
Title and statement of responsibility and	:	Computational Scattering Models for Elastic and Electromagnetic Waves in Particulate Media [Thesis]