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Showing 1 to 20 of 21 for “"Piezoelectric Devices"”.
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Finite Element Modeling and Active Control of an Inflated Torus Using Piezoelectric Devices
… dynamics and vibration suppression via piezoelectric actuators, using active control of an inflatable torus. A commercial finite element package, ANSYS, is used to model the inflated torus. The effect of torus aspect ratio and inflation pressure on the vibratory response of the structure …
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Piezoelectric active sensor and electric impedance approach for structural dynamic measurement
The increasing use of piezoelectric material in the last decade has led to the new discovery that piezoelectric devices may be used not only as sensors or actuators individually, but also as a sensor and actuator at the same time. This bi-directional phenomenon greatly expands the utility of …
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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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Controlling Self -Assembly of Anisotropic, Rod-Like Polypeptides on Solid Surfaces
… at interfaces is relevant to applications in piezoelectric devices, optical data storage, biological mimicry, and nonlinear optics. Our work has centered on (1) novel syntheses and characterization of polypeptides that can spontaneously assemble onto model surfaces, (2) molecular design of …
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Investigation and characterization of a high energy piezoelectric pulse
… investigates and characterizes a high energy piezoelectric pulse generator (PPG) constructed from commercially available piezoelectric materials. The high energy PPG converts mechanical energy into electrical energy, storing that energy in its internal capacitance. The energy storage of the …
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Dynamic response of simply supported beams excited by piezoelectric actuators
The use of piezoelectric devices for the purposes of active noise or vibration control has become attractive in recent times. These small, power to weight efficient devices have had some success in active vibration control; however, the force transfer mechanism by which they interact with the …
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Large-Signal Characterization of Piezoelectric Resonators for Power Conversion
… weight, and poor performance at small sizes. Piezoelectric devices, when operated in their inductive regime, can serve a purpose similar to that of magnetic components and offer favorable scaling properties as components are miniaturized. Several sources have demonstrated the viability of …
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A Study on Energy Harvesters for Physical Unclonable Functions and Random Number Generation
… sensor nodes in Internet of Things (IOT) devices increase over the years, securing personal data becomes a growing issue. Physical unclonable functions (PUFs) and random number generators (RNGs) provide methods to generate security keys for data encryption. Transducers used in the energy …
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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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Barium Titanate-Based Magnetoelectric Nanocomposites
… BTO has found applications in new, useful smart devices, such as sensors and piezoelectric devices. Not only limited to one material, multi-layers or multi-phases can lead to multifunctional applications; for example, nanocomposites can be fabricated with ferrite or metal phase with BTO. In this …
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Vibration Energy Harvesting for the Development of autonomous monitoring Systems. Application to railway Bridges
… the modelling, optimisation, and validation of piezoelectric (PEH) and magnetoelastic (MEH) energy harvesters, with particular emphasis on their application to railway bridges. Analytical lumped-parameter models are derived from a variational formulation for bimorph and unimorph cantilever …
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Harmonic poly-actuator : design and control of a new piezoelectric mechanism
Piezoelectric devices, e.g. piezoelectric stack actuators, have several salient features inherent to their structure. They are efficient, have a high bandwidth, and their capacitive loading allows for static loads to be maintained with virtually no power consumption. The major preventative drawback …
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Multimaterial acoustic fibers
… lasers, fiber diodes, and other functional fiber devices have been demonstrated with this approach. Yet, throughout this development and indeed the development of fibers in general, a key premise has remained unchanged : that fibers are essentially static devices incapable of controllably changing …
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Decoding of Facial Strains via Conformable Piezoelectric Interfaces and Three-Dimensional Digital Image Correlation
Devices that facilitate nonverbal communication typically require high computational loads or have rigid and bulky form factors that are unsuitable for use on the face or on other curvilinear body surfaces. This work reports the design and pilot testing of an integrated system for decoding facial …
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Analysis and modeling of piezoelectric resonant body transistors
… technology. To this end, both dielectric and piezoelectric transduction based resonators have been demonstrated as viable alternatives to their electrical counterparts. Dielectric (or electrostatic) based resonators take advantage of the cost-scaling of Silicon micromachining and the excellent …
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Modeling and control of quartz crystal operated in liquid for bio-sensing application
… Quartz Crystal Microbalance (QCM). The QCM is a piezoelectric mass-sensing device. A QCM device works by sending an electrical signal through a gold-plated quartz crystal, which causes a vibration at some resonant frequency. The QCM then measures the frequency of oscillation in the crystal. When …
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Advancing acoustic devices towards mmwave
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-12-01
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Active control of automobile cabin noise with conventional and advanced speakers
… vehicle using advanced, compact lightweight piezoelectric acoustic sources. First, a test structure approximately the same size as the automobile was built to study the principles of active noise control in a cavity. A finite element model of the cavity was created in order to optimize the …
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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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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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