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 20 of 27 for “"Elastic wave propagation"”.
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Elastic Wave Propagation in Rods and Bars
Made available in DSpace on 2014-12-14T14:42:18Z (GMT). No. of bitstreams: 1 8009217.pdf: 2610408 bytes, checksum: e5f3b5bd5f5af2743cfec0ca3459dfd1 (MD5) Previous issue date: 1979
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Study in visco-elastic wave propagation by photoviscoelasticity, A
Includes bibliographical references.
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Elastic wave propagation and scattering in anisotropic fractured media
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1991.
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Elastic wave propagation along a borehole in an anisotropic medium
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1990.
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Linear and nonlinear elastic wave propagation in a fluid-filled borehole
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1993.
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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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Tailoring elastic wave propagation at the macro and microscale via intentional nonlinearity
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2025-05-01
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Elastic wave propagation in anisotropic media : source theory, traveltime computations and migration
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1992.
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An axisymmetric finite element solution for elastic wave propagation through threaded connections
… element solution method is developed for axial wave propagation through a series of threaded connections in rock drills. A piston impacts axially on a string of rods held together by threaded joints and the wave propagates through these joints before reaching the bit. The energy lost in the …
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On axially symmetric elastic wave propagation in a fluid-filled cylindrical shell
The early stages of propagation of a water hammer disturbance are investigated, water hammer constituting a special case of axially symmetric elastic wave propagation in a fluid-filled cylindrical shell. Many of the objectionable features of the elementary (Joukowsky) water hammer theory are …
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Modeling of elastic wave propagation in a fluid-filled borehole excited by a piezoelectric transducer.
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1991.
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Elastic wave propagation in homogeneous transversely isotropic medium with symmetry axis parallel to the free surface.
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Science, 1973.
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Finite difference solutions to the equations of elastic wave-propagation, with application to Love waves over dipping interfaces.
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Sciences, 1970.
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Interaction of acoustic waves and anisotropic multilayered composite plates immersed in water.
In this dissertation a theoretical analysis of elastic wave propagation in multilayered anisotropic composite plates is presented. Reflection and transmission coefficients as a function of the plane wave incident angle and ultrasonic wave frequency are computed for single layered and multilayered …
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Lattice modeling of ultrasonic nondestructive evaluation of attenuating materials
… evaluation. When subjected to ultrasonic waves, nanocomposites often exhibit attenuation that is an order of magnitude higher than that of carbon fiber reinforced polymeric composites. Thus, an accurate model of ultrasonic wave propagation in nanocomposites as well as several other modem …
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Signal processing techniques for ultrasonic inspection
… is discussed in Chapter 3 with some examples of elastic wave propagation in welded steel. The limitations in applying sophisticated signal processing techniques to ultrasonic NDT~ mainly found in the transducers generating or receiving the ultrasound. Chapter 4 deals with the different …
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Seismic wave modelling using finite difference methods
… numerical approach to model numerically seismic wave propagation, and also to ascertain if rock interfaces could be inferred from signals received at a geophone.<br/><br/>We mainly employ two different models together, namely the "Parsimonious staggered grid" and the "Box" model. So far as we are …
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Modeling ultrasonic transducer in homogeneous and non-homogeneous media using DPSM method
… as: (1) point sources generating spherical wave fronts (2) line sources generating cylindrical wave fronts, or (3) planar surfaces generating plane wave fronts. In reality, the transducer front face has finite dimensions; it is neither point source nor planar source because the ultrasound …
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Long Term Health Monitoring of Anthony Wayne Bridge Main Cable with Acoustic Emission Technique
… of energy within a material generating transient elastic wave propagation, is widely used as a non-destructive technique (NDT). AE events generate a spectrum of stress waves starting at 0 Hz, and typically falling off at several MHz . Based on the characteristics of AE waveforms and wave …
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Two Innovative Applications Combining Fiber Optics and High Power Pulsed Laser: Active Ultrasonic Based Structural Health Monitoring and Guided Laser Micromachining
… fiber optic generation and detection of acoustic waves for structural health monitoring in harsh environments. Three different acoustic generation mechanisms were studied in detail, including laser induced plasma breakdown (LIB), Erbium-doped fiber laser absorption, and metal laser absorption. By …
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