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This article contains electromechanical analysis of a piezoelectric bimorph actuator at high electric field by incorporating second-order constitutive equations of piezoelectric material. Tip deflection, block force, block moment,...
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This article contains electromechanical analysis of a piezoelectric bimorph actuator at high electric field by incorporating second-order constitutive equations of piezoelectric material. Tip deflection, block force, block moment, block load, output strain energy, output energy density, input electrical energy, and energy efficiency are analytically derived for the actuator at high electric field. The analysis shows that output energy and energy density increase more rapidly at high electric field, compared to the prediction by the linear model. The analysis shows energy efficiency depends on electric field. Some analytical results are validated with the published experimental results.
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Over 100 years ago, Jacques and Pierre Curie experimentally confirmed the presence of the piezoelectric effect in quartz, Rochelle salts and tourmaline single crystals. Within the last 50 years, a number of ceramic and polymer mat...
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Over 100 years ago, Jacques and Pierre Curie experimentally confirmed the presence of the piezoelectric effect in quartz, Rochelle salts and tourmaline single crystals. Within the last 50 years, a number of ceramic and polymer materials with non-symmetrical crystal structures have also been found to exhibit the piezoelectric effect. The discovery of strong piezoelecticity in these materials has led to their commercialization and has been a major factor in the development of a wide range of applications.
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Piezoelectric coefficients of alpha-quartz are derived from symmetry arguments based on Neumann's principle using three different methods: Fumi, Landau-Lifshitz and Royer-Dieulesaint. While the Fumi method is tedious and the Landa...
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Piezoelectric coefficients of alpha-quartz are derived from symmetry arguments based on Neumann's principle using three different methods: Fumi, Landau-Lifshitz and Royer-Dieulesaint. While the Fumi method is tedious and the Landau-Lifshitz method requires additional physical principles to evaluate the piezoelectric coefficients, the Royer-Dieulesaint method is the most elegant and most efficient of the three techniques.
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Abstract In recent years, smart materials have piqued the interest of scientists and physicians in the biomedical community owing to their ability to modify their properties in response to an external stimulation or changes in the...
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Abstract In recent years, smart materials have piqued the interest of scientists and physicians in the biomedical community owing to their ability to modify their properties in response to an external stimulation or changes in their surroundings. Biocompatible piezoelectric materials are an interesting group of smart materials due to their ability to produce electrical charges without an external power source. Electric signals produced by piezoelectric scaffolds can renew and regenerate tissues through special pathways like that found in the extracellular matrix. This review summarizes the piezoelectric phenomenon, piezoelectric effects generated within biological tissues, piezoelectric biomaterials, and their applications in tissue engineering and their use as biosensors.
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Development of sensors technology steady trends toward miniaturization and multi-functionality. The presented in this work new sensor configurations, fabricated from subsequent layers of piezoelectric ceramics and magnetostrictor,...
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Development of sensors technology steady trends toward miniaturization and multi-functionality. The presented in this work new sensor configurations, fabricated from subsequent layers of piezoelectric ceramics and magnetostrictor, was realised by superposition two different effects - piezoelectric and magnetostrictive in one compact structure of piezoelectric transformer. This construction exhibits many interesting and unusual piezoelectric andmagnetic properties. The oscillation amplitude, phase and resonance frequency are modified by magnetic field induced interaction forces. Additional advantage of this device is simplified construction, in which the vibration detection is realized avoiding any additional coil for magnetic field generation as in previous solutions. A demonstration of voltage gain and efficiency, as well as gain reversal via the application of magnetic field across a multiferroic heterostructure is presented.
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Piezoelectric 0-3 composites have been prepared by mixing crystalline Sn_2P_2S_6 powder with epoxy. These composites exhibit a large hydrostatic voltage sensitivity g_h. Maximum values of g_h (150-155 mVm/N) were obtained for a sa...
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Piezoelectric 0-3 composites have been prepared by mixing crystalline Sn_2P_2S_6 powder with epoxy. These composites exhibit a large hydrostatic voltage sensitivity g_h. Maximum values of g_h (150-155 mVm/N) were obtained for a sample with crystalline phase volume percentage of above 65 percent. A sharp increase of g_h and d_h coefficients decrease of the sample thickness below approximately 1 mm is found. The effect allows fabrication of highly sensitive composites for hydrophone application.
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摘要 :
Over 100 years ago, Jacques and Pierre Curie experimentally confirmed the presence of the piezoelectric effect in quartz, Rochelle salts and tourmaline single crystals. Within the last 50 years, a number of ceramic and polymer mat...
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Over 100 years ago, Jacques and Pierre Curie experimentally confirmed the presence of the piezoelectric effect in quartz, Rochelle salts and tourmaline single crystals. Within the last 50 years, a number of ceramic and polymer materials with non-symmetrical crystal structures have also been found to exhibit the piezoelectric effect. The discovery of strong piezoelecticity in these materials has has led to their commercialization and has been a major factor in the development of a wide range of applications. This paper begins with a review of the fundamental properties of piezoelectric materials. A description of the important types of piezoelectric materials and their characteristics are presented next, followed by discussions of selected applications, with additional applications listed in tabular format.
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In this work, commercial piezoelectric materials are electromechanically characterized, in different configurations for potential use in harvesting devices of mechanical energy, in order to store and use in the feeding of low powe...
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In this work, commercial piezoelectric materials are electromechanically characterized, in different configurations for potential use in harvesting devices of mechanical energy, in order to store and use in the feeding of low power electronic systems.
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Piezoelectric ceramic-polymer composites have been conceptualized, prototyped, fabricated by rapid prototyping in order to surpass those fabricated with traditional processing methods in novelty as well as performance. Rapid proto...
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Piezoelectric ceramic-polymer composites have been conceptualized, prototyped, fabricated by rapid prototyping in order to surpass those fabricated with traditional processing methods in novelty as well as performance. Rapid prototyping offers unmatched design and fabrication flexibility in achieving structural complexity and hierarchy in developing piezoelectric composites. A detailed account of all salient aspects of Fused Deposition of Ceramics (FDC) and Fused Deposition of Multi-Materials (FDMM), two major technologies pioneered at Rutgers University, are discussed. Structure-processing-property relations are elaborated on using connectivity as the unifying central concept. Examples of novel piezoelectric ceramic-polymer composites fabricated using FDC and FDMM are given, and pertinent electromechanical properties are discussed. Pending challenges in this line of research are also elaborated on.
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Transformation of square pulse signals by the multilayer Rosen type piezoelectric transformer (PT) is investigated with the goals to preserve the signal waveform and achieve maximum efficiency for power electronics and LED lightin...
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Transformation of square pulse signals by the multilayer Rosen type piezoelectric transformer (PT) is investigated with the goals to preserve the signal waveform and achieve maximum efficiency for power electronics and LED lighting applications. The voltage gain of the transformer is calculated from equations of linear piezoelectricity and motion for a broad frequency range that includes multiple resonant frequencies of PT. The transformation of the square pulse is simulated numerically by applying the voltage gain function to the Fourier spectrum of the input signal, and then, restoring the time-domain output signal from its spectrum. A half-bridge MOSFET amplifier is built to drive the PT in the experimental setup. The measurements of the input and output waveforms and their Fourier spectra verify the calculations. It is shown that the components of the spectrum and the waveform of the square pulse signal can be preserved in the output signal by using multiple resonant frequencies of the transformer. With the accurate match between the signal harmonics and the resonant frequencies of the transformer voltage gain, the square pulse signal provides higher output power than a sine or a square wave, provided that the dominant harmonics of all signals have the same amplitude.
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