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 862 for “"piezoelectric"”.
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Piezoelectric ultrasonic micromotors
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1995.
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Bending mechanism for piezoelectric transducer footstep energy harvesting using piezoelectric tile
… that have been exhausted in these few decades. Piezoelectric material that has been widely used in sensor technologies is able to produce electrical energy from mechanical energy. Therefore, this transducer can be used to harvest the wasted mechanical energy from human body action. Many …
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Piezoelectric and Magnetostrictive Transducers
Made available in DSpace on 2014-12-04T21:03:03Z (GMT). No. of bitstreams: 1 5805501.pdf: 8039716 bytes, checksum: b087be9bf8848dbe16937d1aa3bd5632 (MD5) Previous issue date: 1958
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Piezoelectric effects in GaAs MESFET's
… shifts in GaAs MESFET structures due to the piezoelectric nature of the gallium arsenide lattice. This work develops a framework of mathematical models and experimental techniques by which the intrinsic stresses in the film and the GaAs substrate can be evaluated. Specifically, this work …
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Acoustically driven piezoelectric radiating elements
This Dissertation was approved for publication on 2020-05-01 at 17:01.
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Multifunctional Piezoelectric Energy Harvesting Concepts
… vibration energy into electrical energy using piezoelectric materials, which exhibit electromechanical coupling between the electrical and mechanical domains. Typical piezoelectric energy harvesting systems are designed as add-on systems to a host structure located in a vibration rich …
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Piezoelectric Energy Harvesting for Roadways
… of roadway accessories in different scales. Piezoelectric energy harvesting consisting of PZT piezoceramic disks sealed in a protective package is developed in this work to harness the deformation energy of pavement induced by traveling vehicles and generate electrical energy. Six energy …
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Tiny Piezoelectric Energy-Harvesting CMOS Charger
… to support the functionality. Fortunately, piezoelectric transducer can draw kinect energy from ambient vibrations to constantly replenish the batteries. Tiny piezoelectric transducers, however, only draw a small portion of the energy from vibration. Moreover, the charger is lossy, and …
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OPTIMIZATION OF A PIEZOELECTRIC ACOUSTICAL COMPRESSOR
… model describing a fluid interacting with a piezoelectric actuator is developed. This system is used to generate finite amplitude standing waves in an acoustic cavity with rigid walls. The model includes the effects of viscous and thermal damping of the fluid at the boundary of the cavity, …
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Impedance matching circuit for piezoelectric transducers.
Thesis. 1978. M.S.--Massachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science.
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Piezoelectric fiber composites for structural actuation
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1994.
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Frequency synthesis using MEMS piezoelectric resonators
(cont.) Ultimately, this thesis presents two approaches to frequency synthesizer design. The first uses frequency windows of approximately 200 MHz. The 800 MHz to 1 GHz matching network is presented in detail along with predicted performance capabilities across this frequency range. The second …
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Piezoelectric actuators for helicopter rotor control
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1989.
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High Performance Lead--free Piezoelectric Materials
Piezoelectric materials find applications in number of devices requiring inter-conversion of mechanical and electrical energy. These devices include different types of sensors, actuators and energy harvesting devices. A number of lead-based perovskite compositions (PZT, PMN-PT, PZN-PT etc.) have …
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Lead - Free Piezoelectric Based Magnetoelectric Composites
… to design, synthesize and characterize lead-free piezoelectric based magnetostrictive components based magnetoelectric (ME) composites that exhibit self-bias characteristics and high amplitude of ME coupling. The secondary goal of this thesis was to lay down the foundation for nanoscale and …
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Electromechanical Modeling of Piezoelectric Energy Harvesters
… be used for vibration-to-electricity conversion, piezoelectric transduction has received the most attention in the literature. Piezoelectric materials are preferred in energy harvesting due to their large power densities and ease of application. Typically, piezoelectric energy harvesters are …
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Size-dependent Electroelastic Properties of Piezoelectric Nanoplates
With the development of nanotechnology, piezoelectric nanostructures have attracted a surge of interests in research communities for the potential applications as transistors, sensors, actuators, resonators and energy harvesters in nanoelectromechanical systems (NEMS) due to their high …
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Piezoelectric Control of Structures Prone to Instabilities
Thin-walled structures such as stiffened panels fabricated out of high strength materials are ubiquitous in aerospace structures. These are prone to buckle in a variety of modes with strong possibility of adverse interaction under axial compression and/or bending. Optimally designed stiffened …
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ARTERIAL WAVEFORM MEASUREMENT USING A PIEZOELECTRIC SENSOR
… monitor peripheral arterial pulse using a PVDF piezoelectric sensor. After comparing different locations of sensor placement, a specific sensor wrap for the finger was developed. Its composition, size, and location make it inexpensive and very convenient to use. In order to monitor the …
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