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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 20 of 43 for “"Elastic waves"”.
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Elastic Waves Along a Fracture Intersection
… examined the effect of fracture intersections on elastic wave propagation. Intersections play a key role in the connectivity of a fracture network that ultimately affects the hydraulic integrity of a rock mass. In this dissertation two new types of coupled waves are examined that propagate along …
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Velocity of elastic waves in sand, The
Includes bibliographical references (pages 61-63).
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Domain decomposition methods for time-harmonic elastic waves
The construction of optimal solvers for high frequency Helmholtz-type equations is highly problematic. After discretisation of the previous equations by a finite element method,the underlying linear systems are usually large and difficult to solve both by direct and iterative methods. Domain …
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Scattering of elastic waves around a compressional source.
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Science, 1972.
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Scattering of elastic waves using non-orthagonal expansions
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1996.
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Interaction of Plane Elastic Waves With an Elastic Cylindrical Shell
Made available in DSpace on 2014-12-05T17:37:41Z (GMT). No. of bitstreams: 1 6305166.pdf: 3600840 bytes, checksum: 956658a5d616f34c0d92791bf15fb7fa (MD5) Previous issue date: 1963
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Theoretical and Experimental Studies of Manipulation of Elastic Waves in Helix Metamaterials
… Carrera Unified Formulation Abstract Elastic metamaterials exhibit mechanical properties unattainable in natural materials and demonstrate vast potential in vibration and noise reduction, acoustic functional devices, acoustic stealth, energy harvesting, and fault diagnosis. To fully …
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Spatial spectral analysis of elastic waves in a three-dimensional truss structure
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1996.
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Full-scale simulation of multiple scattering of elastic waves in fiber reinforced composites
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1998.
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ΔΙΑΔΟΣΗ ΤΑΣΙΚΩΝ ΚΥΜΑΤΩΝ ΣΕ ΣΥΝΘΕΤΑ ΥΛΙΚΑ ΚΑΙ ΠΡΟΣΔΙΟΡΙΣΜΟΣ ΤΩΝ ΔΥΝΑΜΙΚΩΝ ΤΟΥΣ ΙΔΙΟΤΗΤΩΝ
IN THE WORK WITH SUBJECT "WAVE PROPAGATION OF ELASTIC WAVES IN COMPOSITE MATERIALS" HAVE BEEN DEVELOPED THE LOW-FREQUENCY SCATTERING THEORY OF ELASTIC WAVES BY A PENETRABLE SCATTERER WITH A PENETRABLE CORE. ANALYTICAL EXPANTIONS FOR THE SCATTERING AMPLITUDES AND FOR THE SCATTERING CROSS-SECTION …
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Broadband microwave inverse scattering: Theory and experiment
… Emphasis is placed on the use of microwaves to probe the unknown object, although much of the theory presented applies to other types of waves such as acoustic and elastic waves.
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Destructive disassembly of bolts and screws using impact
… process by studying the characteristics of elastic waves caused by impact. This research presents a new method for increasing the shear stress applied on the bolt head without increasing the energy input invested on launching striker. The equations are developed for the elastic waves in …
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Scattering Techniques for the Geophysical Inverse Problem
… the inverse problem for the propagation of elastic waves in stratified media. The one-dimensional inverse problem for the propagation of shear waves is studied in the context of spectral theory. We generalize certain inverse scattering methods in quantum mechanics to determine the properties …
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Analysis of seismo-acoustic emission from ice fracturing events during SIMI’94
… direct measurements of ice-borne seismo-acoustic waves generated by ice fracturing processes. A major reason for studying this phenomenon is that this acoustic emission is a significant contributor to Arctic ocean ambient noise. Also the Arctic contains rich mineral and oil resources and in order …
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Nonlinear ultrasonic guided waves for quantitative life prediction of structures with complex geometries
… of these nascent cracks leads to non-linear elastic response of the material. These non-linearities can be detected from harmonic generation for propagating elastic waves. The long term goal of this study is to investigate the non-linear elastic propagation in parts with complex geometry. …
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Topics in diffuse field ultrasonics
… primary aims of Diffuse Field Theory. When the waves of interest are elastic waves at frequencies above 20kHz, the subject can be called Diffuse Field Ultrasonics. Here, three topics of Diffuse Field Ultrasonics are presented. The first concerns the identification of the Green’s function with …
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Modeling and characterization of elastic wave propagation in micro-scale photonic crystals
… another material, leading to periodic changes in elastic properties of the composite structure. Such devices exhibit elastic bandgaps, which are very useful in many commercial applications. Filtering, guiding and mirroring of elastic waves are a few applications in which phononic crystals can be …
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Group Velocity Of Acoustic Waves In Plates Of Electronic Materials
… and dispersion characteristics of plate acoustic waves (PAW) in electronic materials are investigated experimentally. Plate acoustic waves are elastic waves that travel along a plate with thickness comparable to the wavelength of the waves. Lamb waves, a type of plate acoustic wave, have particle …
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