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 17 of 17 for “"Piezoelectric ceramic"”.
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Modeling and Synthesis of a Piezoelectric Ceramic-Reinforced Metal Matrix Composite
… capability in the form of Joule heat for any piezoelectric ceramic-reinforced metal matrix composite system. Specifically, barium titanate (BaTiO₃), lead titanate (PbTiO₃), and zinc oxide (ZnO) piezoelectric ceramics have been modeled as dispersed particles shaped as spheres, prolate …
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Design and fabrication of a piezoelectric stack actuator for use in a needle-free jet injector
This thesis presents the design of a piezoelectric ceramic stack actuator for use with needle-free jet injection (NFJI) devices. While NFJI devices have been in use for over 60 years only recently have they been electronically actuated which allows for precise control of jet velocity, penetration …
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Structural Damage Classification using Support Vector Machines
… and support vector machines is investigated. Piezoelectric ceramic actuators are utilized to generate guided wave signals on a set of aluminum beam coupons with different damage features, such as types, locations, and thicknesses. The short-time Fourier transform is applied to analyze the …
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Electromagnetic nanopositioner
… in these applications is often provided using piezoelectric ceramic actuators. The drawbacks to using piezoelectric actuators include high hysteretic heating, lightly damped structural resonances, the need for preload on the actuator stack, as well as the requirement for a high voltage …
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Low-Power System Design for Impedance-Based Structural Health Monitoring
… results. Impedance-based SHM utilizes a piezoelectric ceramic as a collocated actuator and sensor, which measures the electrical impedance of the piezoelectric ceramic over a certain frequency range. The impedance profile of a structure under monitoring is compared against a reference …
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Some experimental investigation on effect of light and vibration on nano coated piezo for energy harvesting
<p>PZT is a promising piezoelectric ceramic material which has a wide range of applications in a variety of fields such as acoustic sensors and transducers, electrical switches, medical instrumentation, artificial sensitive skin in robotics, automotive detection on roads, nondestructive testing , …
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Microfabrication and electrical characterization of lead-free sodium potassium niobate thin film ribbons on conformal substrates
… and disposal of the predominantly used leaded piezoelectric ceramic- Lead Zirconate Titanate (PZT). The European Union has initiated restricting the use of lead in commercial products, with countries such as China and Japan. These regulations provide further motivation for the development of an …
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Active control of broadband acoustic radiation from structures
… The control inputs were implemented with piezoelectric ceramic actuators (PZT). Both far-field microphones and polyvinylidene fluoride (PVDF) structural sensors designed to optimally control the efficient acoustic radiating modes were used as error sensors. The disturbance was band-limited …
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Nonlinear Control of Plate Vibrations
… shaker. Strain gages are used as sensors, while piezoelectric ceramic patches are used as actuators. The control technique is implemented using a dSPACE digital signal processing board and a modeling software (SIMULINK). Both numerical and experimental results show that the control strategy is …
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Nonlinear Mechanical and Actuation Characterization of Piezoceramic Fiber Composites
The use of piezoelectric ceramic materials for structural actuation is a fairly well developed practice that has found use in a wide variety of applications. However, actuators with piezoceramic fibers and interdigitated electrodes have risen to the forefront of the intelligent structures community …
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Application and development of finite element techniques for transducer design and analysis
… the class I flextensional transducer driven by a piezoelectric ceramic stack is selected as being suitable for OAT. Finite element (FE) techniques are applied to the design of this transducer. By observing the change in pertinent performance characteristics of the device in response to altering …
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Piezoelectric Transformer Characterization and Application of Electronic Ballast
The characterization and modeling of piezoelectric transformers are studied and developed for use in electronic ballasts. By replacing conventional L-C resonant tanks with piezoelectric transformers, inductor-less piezoelectric transformer electronic ballasts have been developed for use in …
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Investigating Ferroelastic and Piezoelectric Vibration Damping Behavior in Nickel-Barium Titanate and Nickel-PZT Composites
Ferroelectric and piezoelectric ceramic reinforced metal matrix composites are new materials being explored for vibration damping purposes. The high damping ability of ferroelectric and piezoelectric ceramics such as barium titanate (BaTiO3) and lead zirconate titanate (PZT) is due to the anelastic …
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Development and Characterization of a Mechanically Prestressed Piezoelectric Composite
Piezoelectric composites have been investigated for use in a variety of areas, including flow control, structural control, energy harvesting, and fuel ignition systems. While many of the investigations conducted in these areas have utilized traditional piezo actuation systems, such as unimorphs or …
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Magnetoelectric Composites for On-Chip Near-Resonance Applications
… that the composite structures consisting of piezoelectric and magnetostrictive phases possess stronger ME coupling in comparison to that of single phase materials. Giant magnetoelectric effect has been reported in variety of composites consisting of bulk-sized ME composites and thin film ME …
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Generating Traveling Waves in Finite Media Using Single-Point Excitation via Passive Absorber
In the mammalian auditory system, specifically in the cochlea of the inner ear, the Basilar Membrane (BM) and hair cells are responsible for transducing incoming acoustic waves into electrical signals. These acoustic signals are carried as traveling waves by the BM and propagate from the base of …
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MnO2 Nanoscale Interface Modification
<p>Interface modification of carbon fibers has been shown to improve the mechanical performance of composites. In addition, interface modification of carbon fiber composites can impart multifunctionality into the resulting composite. This work will explore ZnO and MnO2 as interface modifications …