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Showing 1 to 20 of 59 for “"Piezoelectric Transducers"”.
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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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Uniform-electric-field-approximation based modelling of longitudinal piezoelectric transducers
Longitudinal piezoelectric transducers (LPT), which collectively refer to piezoelectric actuators, vibrators, sensors and actuators designed for longitudinal deformations or vibrations, are the most widely used piezoelectric devices. LPT model, which can be used to predict the behavior or …
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Optical Measurement Methods and an Optically Induced Phenomenon in Piezoelectric Transducers
本文データは平成22年度国立国会図書館の学位論文(博士)のデジタル化実施により作成された画像ファイルを基にpdf変換したものである
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Tunable Piezoelectric Transducers via Custom 3D Printing: Conceptualization, Creation, and Customer Discovery of Acoustic Applications
… 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 transducer manufacturing, and recent advancements in additive manufacturing have enabled this …
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Structural health monitoring of polymer-matrix composites (PMCs) using embedded piezoelectric transducers: experimental and numerical approaches
… Composites (PMC) embedding ceramic and polymeric piezoelectric transducers. The primary objective was to enhance their intelligent functionality to establish experimental/numerical Structural Health Monitoring (SHM). The numerical model, using the Carrera Unified Formulation (CUF) developed at …
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Electromechanical Coupling of Distributed Piezoelectric Transducers for Passive Damping of Structural Vibrations: Comparison of Network Configurations
In this work passive piezoelectric devices for vibration damping are studied. It is developed the basic idea of synthesizing electrical wave guides to obtain an optimal electro-mechanical energy exchange and therefore to dissipate the mechanical vibrational energy in the electric form. Modular …
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Fatigue Enhancement of Undersized, Drilled Crack-Stop Holes
… holes. The technique under development uses piezoelectric transducers operated at ultrasonic frequencies to improve upon recognized coldworking techniques. The piezoelectric transducers duplicate the residual compressive stresses produced by static cold expansion and hopefully change grain …
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Energy-efficient Interfaces for Vibration Energy Harvesting
… of vibration energy harvesting. In terms of the piezoelectric transducers, the open-circuit voltage is usually low, which limits its power while extracted by a full-bridge rectifier. In terms of the interface circuits, most reported circuits are limited by the power efficiency, suitability to …
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A New Approach to Wide Bandwidth Energy Harvesting for Piezoelectric Cantilever Based Harvesters
… a control system to widen the bandwidth of piezoelectric transducers (PZTs) for vibration energy harvesting while extracting maximum power. A straightforward complex conjugate match achieves maximum power transfer only at a single frequency while requiring an impractically large inductance. …
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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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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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Directing acoustic radiation using a phased array of piezoelectric transmitters
… an acoustic phased array system utilizing piezoelectric transducers. The system is capable of operating at arbitrary frequencies into the low megahertz range, with a trade-off between phase accuracy and operational frequency. A maximum of sixteen elements can be introduced to the array and …
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Some rock mechanics problems with application for hydraulic fracturing
… (i.e., stable or stick-slip sliding). Calibrated piezoelectric transducers were used to measure acoustic emissions (AE) generated during HF and fault slip.
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Gallium Nitride phononic crystal resonator
… dimension and to enable routing access of piezoelectric transducers inside the resonant cavity. This provides a clean spectrum over a wide frequency range and improves series resistance relative to transmission line or tethered resonators by allowing a low-impedance path for drive and sense …
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ΠΡΟΓΝΩΣΗ ΣΕΙΣΜΩΝ ΜΕ ΤΗΝ ΤΕΧΝΙΚΗ ΤΗΣ ΑΚΟΥΣΤΙΚΗΣ ΕΚΠΟΜΠΗΣ
… A NETWORK OF 3 MONITORING STATIONS CONSISTING OF PIEZOELECTRIC TRANSDUCERS IN DEEP BOREHOLES, CONDITIONING AMPLIFIERS, VHF FM TRANSMITTERS, MULTIPLEXERS/TIMERS AND SOLAR CELLS, HAVE BEEN INSTALLED AROUND THE TIP OF THE CORINTH GULF NEAR AN SEISMICALLY ACTIVE GEOLOGICAL FAULT, WHICH CONSTITUTES A …
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Piezoelectric energy harvesting: vortex induced vibrations in plants, soap films, and arrays of cylinders
… the collective oscillating motion of multiple piezoelectric devices. These devices would be an alternative to rotating turbine designs for low power generation, for use in applications such as remote power generation. A series of inexpensive devices were developed that harvested energy from …
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A conformable ultrasound patch for cavitation enhanced transdermal cosmeceutical delivery
… the patch and the skin. The cUSP consists of piezoelectric transducers embedded in a soft elastomer to create localized cavitation pockets (0.8 cm², 1 mm deep) over larger areas of conformal contact (20 cm²). Multiphysics simulation models, acoustic spectrum analysis and high-speed videography …
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Neural Network Fatigue Life Prediction in 7075-T6 Aluminum from Acoustic Emission Data
… 7075-T6 aluminum specimens using broad-band piezoelectric transducers. A Kohonen self organizing map was used to classify the AE flaw growth signals. The signals were classified into three categories based on their AE parameters: plastic deformation, plane strain fracture and mixed mode …
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Design and Fabrication of Piezoelectric Sensors and Actuators for Characterization of Soft Materials
… supports the overall goal of creating piezoelectric measurement technology for the analysis and characterization of soft materials that serve as feedstocks (inputs) and products (outputs) of emerging biomanufacturing processes, including cell and additive biomanufacturing processes. The …
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Design and modeling of a PZT thin film based piezoelectric micromachined ultrasonic transducer (PMUT)
The design and modelling framework for a piezoelectric micromachined ultrasonic transducer (PMUT) based on the piezoelectric thin film deposition of lead zirconate titanate (PZT) is defined. Through high frequency vibration (1-16MHz) of a thin plate, the PMUT transmits and receives pressure pulses …
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