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 55 for “"Traveling Waves"”.
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Traveling waves in mode superposition
… long flexible cylinders is often in the form of traveling waves. Therefore, it was necessary to develop an excitation force model which has traveling wave characteristics. This idea has been implemented earlier using a Green's function approach. This work presents the idea of using mode …
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Numerical analysis of the method of freezing traveling waves
In der vorliegenden Arbeit werden spezielle Lösungen von parabolischen partiellen Differentialgleichungen (PDE) u_t = A u_xx + f(u, u_x), nämlich wandernde Wellen der Form u(x,t) = w(x-c t), untersucht. Dabei ist w das Wellenprofil und c die Geschwindigkeit. Das Paar (w,c) lässt sich als …
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Continual Traveling waves in Finite Structures: Theory, Simulations, and Experiments
… and control the motion of the mechanical waves through the finite medium opens up the opportunities for creating novel actuation mechanisms not possible before. However, any impedance to the path of these waves, especially in the form of finite boundaries, disperses this energy in the form …
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A Study on Steady State Traveling Waves in Strings and Rods
… work is to study how mechanical steady state traveling waves can be generated and propagated through one dimensional media by applying forces. By steady state traveling waves we refer to propagating mechanical waves in a finite medium that never exhibit reflections at the boundaries and …
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Effect of traveling waves on Vortex-Induced Vibration of long flexible cylinders
… long flexible cylinders is often in the form of traveling waves. High spatial density fiber optic strain gauge measurements are used to obtain estimates of the phase speed of the waves, the response amplitude and the added mass coefficient. The mean added mass coefficient for the bare cylinder is …
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Generating Traveling Waves in Finite Media Using Single-Point Excitation via Passive Absorber
… responsible for transducing incoming acoustic waves into electrical signals. These acoustic signals are carried as traveling waves by the BM and propagate from the base of the cochlea toward its apex where the helicotrema is located. An impressive feature of the mammalian auditory system is to …
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Viscosity and porosity contribute to both speed and decay of tectorial membrane traveling waves
… been shown that the tectorial membrane supports traveling waves [14] and that these waves may contribute to cochlear tuning and sensitivity by longitudinally coupling radial cross sections [15]. While previous work examined how TM wave properties may impact a variety of hearing properties, the …
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Turbulent Boundary Layer over a Piezoelectrically Excited Traveling Wave Surface
Recent studies have utilized spanwise traveling waves to alter the turbulent boundary layer with the aim of reducing skin friction drag. Spanwise traveling waves are a promising active drag reduction technique; however, the wave generation methods used in previous studies are bulky and could not be …
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The functional role of the mammalian tectorial membrane in the cochlear mechanics
… transmitted into the mammalian cochlea produce traveling waves that provide the mechanical tuning necessary for spectral decomposition of sound. These traveling waves of motion propagate along the basilar membrane (BM) and ultimately stimulate the mechano-sensory receptors. The tectorial …
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Design, Fabrication and Characterization of a Microfluidic Device for Ultrasound-based Cell Sorting
… cell sorting techniques by using ultrasound traveling waves and microbubble tags. A microfluidic device consisting of a flow channel was developed for effectively performing MiCS. The device was designed with the aim of obtaining traveling waves in the flow channel by using various design …
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Modal testing using high speed digital speckle pattern interferometry
… also applied the SPI to the novel measurement of traveling waves on a centre-clamped disc. Traveling waves can be caused by structural problems or damage and are difficult to measure without the ability to capture the relative phase across multiple points. This was achieved through the spatial …
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The functional role of tectorial membrane poroelasticity in cochlear mechanics
… that longitudinal coupling of the TM generates traveling waves that contribute to cochlear tuning. Here we show the importance of (1) viscosity in controlling the spread of excitation in TM traveling waves, as well as the importance of matrix porosity in determining (2) the viscosity of …
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Effect of Reynolds Number and Geometry on the Undulatory Hydrodynamics of Tapered Elastic Plates
… reflection and promotes the development of the traveling waves propagating along the propulsor length. By leveraging the acoustic black hole effect, tapered plates can generate bending patterns that vary from standing wave to traveling wave oscillations. Simulations reveal that although standing …
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Inline microring reflector for photonic applications
… looks at coupling of two contra-directional traveling waves within the ring whereas the second aspect investigates relative excitation of the two competing microring resonant modes. In the former method, we relate the steady state amplitudes of the two traveling waves to the reflection …
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Modulational instability in some shallow water wave models
… is a well known phenomenon of Stokes' periodic waves on the water surface. In this dissertation, we study this phenomenon for periodic traveling wave solutions of various shallow water wave models. We study the spectral stability or instability with respect to long wave length perturbations of …
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FREQUENCY AND AMPLITUDE CONTROL OF CORTICAL OSCILLATIONS BY LIPID METABOLISM
Dynamic patterns, such as oscillations and waves, of signaling factors are of great importance to cell physiology in single and multicellular systems. Currently, majority of the studies focus primarily on cytoskeleton-dependent feedbacks. In contrast, information on signaling mechanisms upstream of …
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Numerical Investigation of Crossflow Instability on the HIFiRE-5
… Growth rates for crossflow and second-mode waves computed with 2pLPSE were compared to Spatial BiGlobal (SBG) analysis. Crossflow growth rates agreed well between 2pLPSE and SBG, indicating that the more expensive SBG approach is unnecessary for crossflow computation over the acreage. …
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Coherent structures in incompressible fluid flows
… The search for relative periodic orbits and traveling waves in pipe---the constituents solutions to periodic orbit theory---are discussed. The successful search for relative periodic orbits at transitional Reynolds numbers gave a catalogue of invariant solutions; many of these solutions were …
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Stochastic electron trajectories and wave interaction in relativistic gyro-traveling wave amplifiers
Gyro-traveling-wave amplifiers (gyro-TWAs) are types of gyrodevices, which take advantage of the cyclotron maser instability to produce coherent electromagnetic (EM) radiation from electrons gyrating in an external magnetic field and interacting with fast traveling waves. For high power …
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Solute Transport and Biodegradation Characteristics for Models of Enhanced Subsurface Bioremediation
… (front coherence) and promotes the formation of traveling waves. If the acceptor is not consumed during microbial decay, the long-term biodegradation rate is a function only of the stoichiometric ratio of acceptor to substrate consumption, initial and input solute concentrations, and the …
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