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 7 of 7 for “"high frequency vibration"”.
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Analysis of an Intervention to Reduce Truck Drivers' Exposure to Whole-Body Vibration
Introduction. The high prevalence of low back pain in drivers of commercial motor vehicles is well-documented. A number of interventions to reduce low back pain in commercial motor vehicle operators have focused on reducing exposures to wholebody vibration (WBV). Objective. An intervention to be …
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Design and modeling of a PZT thin film based piezoelectric micromachined ultrasonic transducer (PMUT)
… zirconate titanate (PZT) is defined. Through high frequency vibration (1-16MHz) of a thin plate, the PMUT transmits and receives pressure pulses to construct medical ultrasound images as an alternative to bulk piezoelectric transducers currently in use. Existing transducers are difficult to …
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Characterization of Structure-Borne Tire Noise Using Virtual Sensing
… noise has two main sources, 1) travellinglow frequency excitation below 800 Hz from road surface through a structure- borne pathand 2) the high frequency (above 800 Hz) air-borne noise that is caused by air- pumpingnoise caused by tread pattern.The structure-borne waves of the circumference of …
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Numerical Study of Nutrient Mixing in Trabecular Bone in Microgravity, Disuse and Normogravity
… loss. This thesis investigates how oscillation frequency and trabecular bone density jointly control nutrient mixing and wall shear stress within trabecular cavities.</p> <p>A computational fluid dynamics (CFD) framework is developed in STAR-CCM+ using a soft-cap oscillation model that mimics …
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Vibration-Induced Atomization Of Liquids With Application To Ultrasonic Medical Nebulizers
… generation, but it can be demonstrated that the high frequency vibration of these devices is sufficient to produce appropriately-sized aerosol droplets. A sufficiently small volume or "thin film" of liquid that is vibrated under correct conditions will produce a fountain of atomized liquid …
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Computational modeling of intrinsic dissipation in nano-structure
… to model intrinsic damping is developed. The high frequency vibration in NEMS have important applications. A few examples include the sensing of atomic mass, detection of biological molecules and observation of quantum effects in macroscopic objects. For all these potential applications, …
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High Frequency Modeling and Experimental Analysis for Implementation of Impedance-based Structural Health Monitoring
… the squared sum of the Z-statistic for each frequency point. Preferred excitation frequencies for macro-fiber composite (MFC) active sensors are statistically determined for a long composite boom under development for use in rigidizable inflatable space structures.