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 8 of 8 for “"High-Frequency Vibrations"”.
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Low magnitude high frequency vibrations applied to the foot through the pedal of a human powered artificial gravity (HPAG) cycle
… Current countermeasures employ impact and high force loading to maintain bone health. An astronaut runs on a treadmill to impact load the weight bearing components of the musculoskeletal system. Elastic bands provide the "down" force for the astronaut while running. For high force loading, …
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ms-Scale temporal coding in the thalamus predicted by whisker dispersive vibrational transduction
… as small as 10μs, there is potential for ultrahigh capacity information channel in kb/s. To study temporal structures in the stimuli that could be encoded by this information channel, highly sensitive acoustic methods were used to listen to fast whisker vibrations up to 10kHz. The observed …
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Design and Development of an Autonomous Line Painting System
… an input desired trajectory and cancel any high frequency vibrations due to the uneven terrain that the vehicle is traversing. Also, the stabilizing system is able to eliminate the long-term drift (due to inaccurate GPS waypoint navigation) using the complementary vision system.
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Optical fiber detection of ultrasonic vibration and acoustic emission
Several techniques for measuring high frequency vibrations are presented. The goal of the study is to develop a sensor for detecting acoustic emissions (AE) inside composite structures. The basics of wave propagation inside of materials has been presented along with an overview of typical acoustic …
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To Couple or not to Couple? Exploring Vibronic Coupling in Organic Semiconductors
… temperatures, rising sea levels, and a growing frequency of extreme climate events. Mitigating this crisis demands a fundamental shift in how we produce, distribute, and use energy. To limit warming below 2◦C, as outlined in the Paris Agreement, there is an urgent need to transition from fossil …
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MITIGATION OF GEAR MESH-FREQUENCY VIBRATIONS UTILIZING A HYDROSTATIC BEARING
<p>In the current environment of noise abatement, high frequency noises are especially objectionable. For gear drives, high frequency noises are symptoms of gear mesh-frequency vibrations which are ever-present due to the imperfect conjugate action between the gears. These vibrations are then …
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Droplet Rebound and Atomization Characteristics of Vibrating Surfaces
… droplets when passing through clouds at high altitudes, causing loss of lift obtained by the wings. It was found that droplet impact characteristics are dependent on droplet size, surface roughness, surface material hydrophobicity, and droplet impact velocity. As a continuation of the …
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Analysis of the sensing region of a PZT actuator-sensor
A high frequency impedance-based qualitative non-destructive evaluation (NDE) technique has been successfully applied for structural health monitoring at the Center for Intelligent Material Systems and Structures (CIMSS) [1-3]. This new technique uses piezoceramic (PZT) patches as actuator-sensors …