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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 23 for “"Piezoelectrics"”.
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Power Electronics Meet Piezoelectrics: Converters, Components, and Miniaturization
… era of miniaturization for power electronics. Piezoelectrics offer several potential size, performance, and manufacturability advantages to power electronics, but harnessing these advantages requires fundamental re-evaluation of both power electronic circuits and piezoelectric components …
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Edge-defined film-fed growth of single-crystal piezoelectrics
Many transducer technologies would benefit tremendously from the development of shaped, oriented single-crystals, of a high-strain, piezoelectric material. Recently, unusually high electrostrictive and piezoelectric actuation has been observed in polycrystals and flux-grown <100> single-crystals of …
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A low-cost automated micromanipulator
… 3D-printing market, as well as advances in piezoelectrics and imaging technologies from the last five years. By accomplishing this, the barrier of entry for work requiring sub-micron measurement will be lowered significantly.
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Analysis of energy flow in controlled structures subject to initial conditions
… of a spring-mass-damper system and a beam-piezoelectrics-electronics system over the transient period of the systems’ response to initial conditions. The systems studied were broken down into capacitive, inertial, resistive and sourcing primitives. All systems containing primitives from all …
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Novel probe structures for high-speed atomic force microscopy
… actuation, eliminating the need for piezoelectrics while demonstrating large - micron scale - actuation and sensitive displacement detection. These new probe designs can potentially demonstrate a wide bandwidth frequency response (e.g. 100 kHz) ideal for high-speed video-rate imaging. …
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A design study to harvest electrical energy from walking and running motions
… turned the design study away from the use of piezoelectrics and a design incorporating a miniature air turbine coupled with an electromagnetic generator was introduced. Initial testing on this proof of concept device yielded peak power values on the order of 10- 4W to 10- 3W with much room for …
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Modeling and design considerations for a micro-hydraulic piezoelectric power generator
… energy domains, namely fluids, structures, piezoelectrics and circuitry. The simulation architecture allows for integration of the elastic equations of structural members into the dynamic simulations as well as monitoring of important parameters such as chamber pressure, flowrate, and …
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Decoding of Facial Strains via Conformable Piezoelectric Interfaces and Three-Dimensional Digital Image Correlation
… mechanically-active functional material, such as piezoelectrics, will be placed. Similar to how chemical assays of a body part would be conducted before designing medication for disorders of that body part, so too does 3D-DIC allow for the mechanical study of biological soft tissue before …
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Dynamics and Control of Smart Structures for Space Applications
… controller is designed to allow the piezoelectrics to form the basis of an ultra-precise 2-D Fabry-Perot interferometer as the gap spacing of the device could be controlled at the nanometer level. Next, an output feedback linear integral control law is examined explicitly for the …
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High Performance Lead--free Piezoelectric Materials
… interesting candidates in the class of lead-free piezoelectrics. Absence of any poisonous element makes it unique among all the other lead-free candidates having presence of bismuth. Curie temperature of 400"C, even higher than that of PZT is another advantage from the point of view of device …
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Structure-Property Relationships of Multifeorric Materials: A Nano Perspective
… and metallic actuators are under development: piezoelectrics, electrostrictors, magnetostrictors, and shape-memory alloys. All of these materials undergo at least two phase transformations with coupled thermodynamic order parameters. These transformations lead to complex domain wall behaviors, …
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Tools and methods for the quality assurance of force platforms in human movement analysis
… force transducers, such as strain gauges and piezoelectrics transducers. Then, description of the two category of FPs, three- and six-component, the signals acquisition (hardware structure), and the signals calibration. Finally, a brief description of the use of FPs in HMA, for balance or gait …
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Aerodynamic and Electromechanical Design, Modeling and Implementation Of Piezocomposite Airfoils
Piezoelectrics offer high actuation authority and sensing over a wide range of frequencies. A Macro-Fiber Composite is a type of piezoelectric device that offers structural flexibility and high actuation authority. A challenge with piezoelectric actuators is that they require high voltage input; …
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Remote plasma assisted fabrication of functional organic and hybrid thin films and supported nanostructures
… as semiconducting devices and superconductors, piezoelectrics, ferroelectrics, optical fibres and liquid crystals. On the other hand, functional materials include ceramics, metals, polymers and organic molecules. In recent years, one of the main goals of materials science is the fabrication of …
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Evaluating the Aerodynamic Performance of MFC-Actuated Morphing Wings to Control a Small UAV
The purpose of this research is to evaluate certain performance characteristics of a morphing<br />wing system that uses Macro Fiber Composites (MFC) to create camber change. This<br />thesis can be broken into two major sections. The first half compares a few current MFC<br />airfoil designs to …
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Preparation and investigation of polymer-foam films and polymer-layer systems for ferroelectrets
… have recently become a new group of piezoelectrics. Ferroelectrets are functional polymer systems for electromechanical transduction, with elastically heterogeneous cellular structures and internal quasi-permanent dipole moments. The piezoelectricity of ferroelectrets stems from …
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Tunable Piezoelectric Transducers via Custom 3D Printing: Conceptualization, Creation, and Customer Discovery of Acoustic Applications
In an increasingly data-driven society, sensors and actuators are the bridge between the physical world and the world of "data." Electroacoustic transducers convert acoustic energy into electrical energy (or vice versa), so it can be interpreted as data. Piezoelectric materials are often used for …
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Investigation of Zinc Oxide Nanowires for Impedance Based Structural Health Monitoring
The goal of this work is to investigate the piezoelectricity of composite laminates embedded with layers of zinc oxide (ZnO) nanowires. ZnO nanowire embedded composites have the potential to sense and actuate giving the potential for these smart composites to serve the function of being load …
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SIlver Tower - A New Paradigm for Tall Building Design
The events of September 11, 2001, seemed to many to presage the end of the skyscraper as an urban form. Some 15 years later, the skyscraper is more prevalent than ever before, owing to its unique advantages over other building forms in an urban, environmental, and sociological context. Skyscrapers …
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