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 46 for “"vibrate"”.
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Rotational movement of a harbor seal whisker during vortex induced vibrations
… that allowed the whisker to rotate as well as vibrate. Experiments with this whisker holding it to rotation only, rotation with spring force, and rotation with vibration showed that the whisker experienced the effects of the Munk moment at higher speeds when allowed to vibrate, also the …
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Improvisation and Healing: Wayfinding as a praxis of knowledge
… because the wind causes the bell to strike and vibrate the air, but there is no sound until that vibration reaches my ear and is interpreted by the mind. Sound exists thus only inside of our mind.' The Master says this is not true: ‘Even if my mind is working, if the wind does not blow, the bell …
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Trans-skull Ultrasound for Imaging and Therapy
… microbubble agents, which scatter sound and vibrate in response to the incident ultrasound, it can enable a range of new therapeutic interventions and open new possibilities for imaging. Despite these advancements, the skull remains a major challenge both for therapy and imaging. This work …
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Vibration of a cantilever beam that slides axially in a rigid frictionless hole
… out of a rigid frictionless hole and is free to vibrate laterally outside the hole. Two Euler equations describing the lateral and axial motion of the beam are presented. A transformation of coordinates to eliminate the moving boundary, and spatial non dimensionalization are used to transform the …
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SOUND MODE APPLICATION
… should manually modify the sound mode (ring, vibrate, silent). So, it’s slightly inconvenient to constantly monitor whether the phone is in general or silent mode. Sometimes user might forget to switch the mobile mode and may create a disturbance in the classroom or in the work area.</p> <p>To …
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Investigation of the behavior of continuous beams under steady state forced vibration
… the experiment. A mechanical shaker was used to vibrate the beam. The experimental and nautical curves showed good agreement with the experimental values being consistently higher. Although the weight of the shaker's moving parts was less than one-tenth the weight of the beam it had considerable …
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The Acoustics of Cerebral Aneurysms
… model. Previously, the hypothesis that aneurysms vibrate at their preferred frequencies had been subject to debate as some researchers suggested that aneurysms are in fact stable (i.e. aneurysms do not vibrate at their natural frequency). This thesis constitutes an experimental proof that aneurysm …
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NONLINEAR DYNAMICS OF CABLE GALLOPING VIA A TWO-DEGREE-OF-FREEDOM NONLINEAR OSCILLATOR
… of a single transmission cable that may vibrate transversely and torsionally has been investigated via a two-degree-of-freedom oscillator. The analytical solutions of periodic motions for this two-degree-of-freedom system are represented by the finite Fourier series. The analytical …
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Passive wake detection using seal whisker-inspired sensing
… on a four-armed flexure, allowing it to freely vibrate, and using strain gauges to measure deflections at the whisker base. Finally, this whisker device is towed behind an upstream cylinder with larger diameter. In the wake, the whisker oscillates with large amplitude and at the Strouhal …
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A MEMS-based precision operational amplifier
… The 'drive loop' utilizes closed-loop control to vibrate the MEMS structure at its mechanical resonant frequency to produce a modulating capacitance. The 'sense loop' senses the up-modulated signal from the MEMS structure, and provides gain and demodulation to this signal. Global feedback around …
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The Live Room : transducing resonant architectures
… creating a place where resonant structures vibrate in sympathy to induced frequencies. By using various transducing devises and signal generating equipment, the project effectively 'tunes in' the space by delivering resonant frequencies. The installation engages directly a unique floor …
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Stress analysis of parabolic arches and their dynamic behavior
… of loading is assumed to cause the structure to vibrate freely. Then, a method of separating variables for partial differential equations is used to get the equations of deflection components. Each special characteristic function is derived for each special set of boundary conditions so as to get …
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Versatile and Sensitive Optical Sensing and Imaging with Spectral Interferometry
… image microscopic mechanical sensors while they vibrate. This dissertation also describes calibration and estimation algorithms for spectral interference, or computer procedures that extract the most information from the camera for a measured signal.
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Detection of defects in FRP-reinforced concrete with the acoustic-laser vibrometry method
… where the FRP has debonded from concrete will vibrate excessively compared to intact material. In order to investigate this method, a laboratory system consisting of a commercial laser vibrometer system and conventional loudspeaker was used to perform tests with fabricated FRP-reinforced …
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Adaptive Communication Interfaces for Human-Robot Collaboration
… complete: for instance, a haptic wristband may vibrate when the human is moving quickly and stop when the user is stationary. But people interpret the same signals in different ways, so what one user finds intuitive another user may not understand. In the absence of task knowledge, conveying …
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Characterization, modeling and mitigation of vortex-induced vibration of slender cylinders
… structural members have often been observed to vibrate at large amplitudes under wind excitation. Vortex-shedding was found to be one of the primary excitation mechanisms which manifests itself as distinct characteristics of the resultant problematic vibrations. The objectives of the proposed …
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On the playability of stringed instruments
As first noticed by Helmholtz, strings vibrate in a “V-shape” when they are bowed correctly and a full tone is produced, where the vertex of the “V” shuttles back and forth along the visible envelope of the string’s motion. If the instrument is bowed incorrectly, i.e. the instrument does not …
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Vibrating transducers for fluid measurements
When a body vibrates in a fluid, some of the fluid is carried with it and the mass loading lowers its resonant frequency. Similarly, when compression of the fluid occurs, there is an added stiffness which by design can be made to predominate. In addition, there is an energy dissipation arising from …
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Thermowell Design Methods and their Implementation in an Expert System
… it is immersed in as it can cause the sensor to vibrate and subsequently damage it. Thermowells have to be designed in such a way that they can resist the vibration caused by the flowing fluid, do not collapse due to the surrounding pressure and the thermowell's material has to be compatible with …
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The construction, development and application of potential simulation models to the filling of carbon nanotubes by molten salts
… As a result, the nanotube is free to rotate, vibrate and translate within the simulation cell and analysis techniques are developed to account for this behaviour. Molecular dynamics simulations are performed using different molten salt models. These salt models are chosen so as to reflect …
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