Дисертації з теми "Piezoelectric electro acoustic transducer"
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Sharapov, V. M., K. V. Bazilo, and R. V. Trembovetskaya. "Electro-Acoustic System with Piezoelectric Sensor." Thesis, Sumy State University, 2015. http://essuir.sumdu.edu.ua/handle/123456789/41006.
Повний текст джерелаChiou, Chwei-Chi. "Electroacoustics of a piezoelectric cylindrical transducer in a fluid-filled borehole." Diss., Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/19300.
Повний текст джерелаДрозденко, Олександр Іванович. "Конструювання електроакустичних перетворювачів з урахуванням кавітаційних, електричних та теплових навантажень". Doctoral thesis, Київ, 2012. https://ela.kpi.ua/handle/123456789/3982.
Повний текст джерелаLarson, Gregg D. "The analysis and realization of a state switched acoustic transducer." Diss., Georgia Institute of Technology, 1996. http://hdl.handle.net/1853/16008.
Повний текст джерелаYavuz, Siar Deniz. "Design Of A Multi-frequency Underwater Transducer Using Cylindrical Piezoelectric Elements." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613392/index.pdf.
Повний текст джерелаParmar, Biren Jagadish. "Development Of Point-Contact Surface Acoustic Wave Based Sensor System." Thesis, Indian Institute of Science, 2006. http://hdl.handle.net/2005/279.
Повний текст джерелаThiercelin, Mickael. "Piézoélectriques cryogéniques pour actuateurs dans l'espace et matériaux piézoélectriques sans plomb pour transducteurs acoustiques." Thesis, Châtenay-Malabry, Ecole centrale de Paris, 2012. http://www.theses.fr/2012ECAP0040/document.
Повний текст джерелаSpace borne observation requires extremely high resolution systems with large dimensions. The design of such systems implies associating sensing and actuation systems to insure a highly stable positioning of optical components. However, the currently used PZT materials for piezoelectric actuation show strongly diminished strain at cryogenic temperatures. This work explores the performances of PMN-xPT piezoelectric materials at cryogenic temperatures. Temperature dependence of PMN-xPT ceramics is compared with hard PZT (PZT-4) and soft PZT (PZT5H) ceramics from RT to 10 K. PMN-PT tetragonal compositions exhibit stable piezoelectric constant in the 250-100 K range. The highest values of piezoelectric constant are observed for PMN-38PT in the 200-50 K range. All ceramics exhibit decreasing performances versus cooling temperature. This behaviour is attributed to a “freezing out” of extrinsic contributions to piezoelectricity [12] but is also due to a contribution of quantum effects [13, 14]. The mechanical quality factor (Qm) increases very quickly from 50 K to 10 K for all samples. This fact could be due to low relaxation processes at very low temperatures. Today acoustic transducers operate with lead-based ceramics, and more particularly lead–zirconate–titanate (PZT). This material is very powerful thanks to these high electromechanical properties. However cause of lead toxicity we have to find new materials without lead in order to replace PZT. In this paper, main guidelines to develop lead-free ceramics are given specially for acoustic transducer. A conventional mixed oxide and carbonate route to synthesis (K,Na,Li)(Nb,Ta,Sb)O3 lead-free ceramics is presented. Excellent density (98% dth) and good electromechanical properties were observed at room temperature
Jenne, Kirk E. "Acoustic cymbal transducers-design, hydrostatic pressure compensation, and acoustic performance." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2004. http://library.nps.navy.mil/uhtbin/hyperion/04Mar%5FJenne.pdf.
Повний текст джерелаThesis advisor(s): Thomas R. Howarth, Dehua Huang. Includes bibliographical references (p. 67-69). Also available online.
Falcetelli, Francesco. "Modelling of Pencil-Lead Break Acoustic Emission Sources using the Time Reversal Technique." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/16554/.
Повний текст джерелаTabrizian, Roozbeh. "Temperature-compensated silicon-based bulk acoustic resonators." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/52929.
Повний текст джерелаArapan, Lilia. "Thin Film Plate Acoustic Resonators for Frequency Control and Sensing Applications." Doctoral thesis, Uppsala universitet, Fasta tillståndets elektronik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-178592.
Повний текст джерелаLombardi, Giulia. "Unified nonlinear electrical interfaces for hybrid piezoelectric-electromagnetic small-scale harvesting systems." Thesis, Lyon, 2020. http://www.theses.fr/2020LYSEI101.
Повний текст джерелаIn this research work, electronic nonlinear interfaces for hybrid energy harvesting systems combining piezoelectric and electromagnetic transducers are presented. Such systems have received great attention due to their ability to detect mechanical vibrations and convert them into electrical energy sufficient to power low-power sensors. In order to supply these microelectronic devices the generated sinusoidal signal needs to be rectified into a constant DC voltage. In other words, once the energy is converted, a proper and smart extraction of such energy needs to be implemented with a dedicated unit. The proposed nonlinear hybrid interfaces developed in this work, aimed at incorporating as much as electroactive parts as possible in the circuit, not only increase the final output power of the involved transducers but also provide a solution for obtaining a common optimal load value, despite dealing with elements singularly presenting different working principles and values of optimal load, without the use of additional load adaptation stages. A first solution is derived from the previously developed SSHI (Synchronized Switch Harvesting on Inductor) and based on the Synchronized Switching technique. This method aims at replacing the passive inductor in the SSHI interface with an active electromagnetic system, leading to an all-active microgenerators interface and increasing the final output power. A second solution is derived from a combination of the SECE (Synchronous Electric Charge Extraction) and SMFE (Synchronous Magnetic Flux Extraction) techniques. Its main principle consists of transferring the energy from the piezoelectric to the electromagnetic transducer and then extracting the boosted energy from the electromagnetic system. The strategy of including as much as electroactive parts within the same electrical interface open many different possibilities of interfacing more than one electroactive system, constituting hybrid energy harvesters, without including extra circuit stages, thus maintaining a relative simplicity without high power losses
Матвійчук, Я. В. "Використання п'єзокерамічних перетворювачів в системах активної звукоізоляції". Thesis, Сумський державний університет, 2015. http://essuir.sumdu.edu.ua/handle/123456789/41319.
Повний текст джерелаBossut, Régis. "Modélisation de transducteurs piézoélectriques annulaires immergés par la méthode des éléments finis." Valenciennes, 1985. https://ged.uphf.fr/nuxeo/site/esupversions/39364c80-50ea-4a42-9b4a-6380d9ebefdd.
Повний текст джерелаBoissinot, Philippe. "Impedance acoustique de rayonnement dans les antennes planes : impedances mutuelles avec un milieu de propagation de type viscoelastique et application aux directivites d'antenne." Paris 6, 1988. http://www.theses.fr/1988PA066092.
Повний текст джерелаSturtzer, Eric. "Modélisation en vue de l'intégration d'un système audio de micro puissance comprenant un haut-parleur MEMS et son amplificateur." Phd thesis, INSA de Lyon, 2013. http://tel.archives-ouvertes.fr/tel-00940463.
Повний текст джерелаBoubenider, Fouad. "Capteur de niveau a ondes elastiques guidees." Paris 6, 1987. http://www.theses.fr/1987PA066276.
Повний текст джерелаDejaeger, Rémy. "Modélisations multiphysiques, réalisation et expérimentations d'un haut-parleur digital matriciel piézoélectrique MEMS." Phd thesis, INSA de Lyon, 2014. http://tel.archives-ouvertes.fr/tel-01035451.
Повний текст джерелаIshak, Dany. "La conception d'un système ultrasonore passif couche mince pour l'évaluation de l'état vibratoire des cordes vocales." Thesis, Valenciennes, 2017. http://www.theses.fr/2017VALE0043/document.
Повний текст джерелаIn this work, a speaker recognition approach using a contact microphone is developed and presented. The contact passive element is constructed from a piezoelectric material. In this context, the position of the piezoelectric transducer on the individual’s neck may greatly affect the quality of the collected signal and consequently the information extracted from it. Thus, the multilayered medium in which the sound propagates before being detected by the transducer is modeled. The best location on the individual’ neck to place a particular transducer element is determined by implementing Monte Carlo simulation techniques and consequently, the simulation results are verified using real experiments. The recognition is based on the signal generated from the vocal cords’ vibrations when an individual is speaking and not on the vocal signal at the output of the lips that is influenced by the resonances in the vocal tract. Therefore, due to the varying nature of the collected signal, the analysis was performed by applying the Short Term Fourier Transform technique to decompose the signal into its frequency components. These frequencies represent the vocal folds’ vibrations (50-1000 Hz). The features in terms of frequencies’ interval are extracted from the resulting spectrogram. Then, a 1-D vector is formed for identification purposes. The identification of the speaker is performed using two evaluation criteria, namely, the correlation similarity measure and the Principal Component Analysis (PCA) in conjunction with the Euclidean distance. The results show that a high percentage of recognition is achieved and the performance is much better than many existing techniques in the literature
Zhang, Yuwen. "Excitation des ondes élastiques au sein d'un demi-espace anisotrope à l'aide des transducteurs interdigites : Application au quartz et au niobate de lithium." Besançon, 1988. http://www.theses.fr/1988BESA2034.
Повний текст джерелаLin, Shih-huang, and 林士煌. "The study of applying Electro Magnetic Acoustic Transducer (EMAT) to detect flaw within cylinder pipe." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/89404981395321762927.
Повний текст джерела國立雲林科技大學
環境與安全工程系碩士班
97
There are not only many complex pipelines but also a great number of machines in fossil fuel plants. These complex pipelines in plants transport chemicals or natural gases. Due to corrosion from long-time use, these pipelines become thinner and perforated with tiny holes. Therefore, pipelines that have been used for a long time increase the risk of accidents happening in plants. Electromagnetic Acoustic Transducer is a non-contacting technique requiring no fluid couplant to detect defects or rough surfaces on pipelines at elevated temperatures in hazardous locations. This experiment uses EMAT to detect long-time-use defects in pipelines, and we discuss the relationship between pipelines and signals transmitted by this experiment. The measurements taken in the experiment indicate that a pipeline with deep or long defects increases the attenuation of amplitude signals. Moreover, a defective pipeline with a greater diameter increases the attenuation of amplitude signals as well. Therefore, according to the results of the experiment, EMAT can detect the relationship between amplitude signals and deep or long defects.