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Dissertations / Theses on the topic 'Energy transducers'

Author: Grafiati

Published: 28 May 2022

Last updated: 31 July 2025

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1

Chen, Yu-Yin. "Piezoelectric power transducers and its interfacing circuitry on energy harvesting and structural damping applications." Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2013. http://tel.archives-ouvertes.fr/tel-00847336.

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Nowadays with the world oil price soaring, the energy issue is becoming a significant topic and the possibility of harvesting ambient energy receiving much attention. In this dissertation, the main topic surrounds improving the piezoelectric energy harvesting device in several aspects and the final objective is to integrate it with low power consumption device, for example a wireless sensor network (WSN) node to extend the battery lifetime and further supply the energy to device directly. Based on the high mechanical quality factor of the structure, the output power of the piezoelectric energy

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2

Carnell, Mark Thomas. "The application of optical diagnostics to high energy electromagnetic acoustic transducers." Thesis, Loughborough University, 1995. https://dspace.lboro.ac.uk/2134/11239.

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This thesis is concerned with the design and construction of an electromagnetic acoustic transducer (EMAT) and the characterisation of its acoustic field both conventionally, using a hydrophone and with high resolution laser illuminated schlieren techniques. During the early 80s the introduction of the EMA T along with the other types of shock wave source used for lithotripsy, revolutionised the treatment of stone disease. The process of shock wave induced destruction of calculi and the use of shock waves in other areas of medicine will be discussed, along with the causes and effects of stone

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3

Röscher, Mark [Verfasser]. "Lead-free piezoelectric transducers for vibration-based energy harvesting devices / Mark Röscher." Aachen : Hochschulbibliothek der Rheinisch-Westfälischen Technischen Hochschule Aachen, 2012. http://d-nb.info/1020250992/34.

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4

Dhar, Romit. "Growth and optimization of piezoelectric single crystal transducers for energy harvesting from acoustic sources." Pullman, Wash. : Washington State University, 2009. http://www.dissertations.wsu.edu/Dissertations/Spring2009/R_Dhar_031309.pdf.

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5

Shen, Dongna Kim Dong Joo. "Piezoelectric energy harvesting devices for low frequency vibration applications." Auburn, Ala., 2009. http://hdl.handle.net/10415/1603.

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6

Aponte, Erick. "A Study on Energy Harvesters for Physical Unclonable Functions and Random Number Generation." Thesis, Virginia Tech, 2017. http://hdl.handle.net/10919/78673.

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As the broad implementation and use of wireless 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 harvesting systems of wireless sensor nodes, can generate the PUFs and RNGs. These transducers include piezoelectric devices (piezo), thermoelectric generators (TEG) and solar cells. This research studies the electrical properties of transducers at normal and

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7

Alrowaijeh, Jamal Salem. "Fluidic Energy Harvesting and Sensing Systems." Diss., Virginia Tech, 2018. http://hdl.handle.net/10919/96241.

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Smart sensors have become and will continue to constitute an enabling technology to wirelessly connect platforms and systems and enable improved and autonomous performance. Automobiles have about two hundred sensors. Airplanes have about eight thousand sensors. With technology advancements in autonomous vehicles or fly-by-wireless, the numbers of these sensors is expected to increase significantly. The need to conserve water and energy has led to the development of advanced metering infrastructure (AMI) as a concept to support smart energy and water grid systems that would respond to emergenc

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Rocha, Rodrigo Tumolin. "On saturation phenomenon in energy harvesting based on nonlinear piezoelectric materials coupled to a portal frame foundation with ideal and non-ideal excitations /." Bauru, 2016. http://hdl.handle.net/11449/143867.

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Orientador: José Manoel Balthazar<br>Banca: Airton Nabarrete<br>Banca: Angelo Marcelo Tusset<br>Banca: Vinicius Piccirillo<br>Banca: Atila Madureira Bueno<br>Abstract: Recently, the interest and research about energy harvesting has been increasing substantially in the technical-scientific community. With the great world demand for electrical energy, many researchers, in Brazil and in the World, have concentrated their efforts to seek new energy sources. In addition, with the technological advances is possible to use low-power consumption devices, that are, most of time, powered by a battery, w

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9

Hobbs, William Bradford. "Piezoelectric energy harvesting: vortex induced vibrations in plants, soap films, and arrays of cylinders." Thesis, Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/33811.

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The goal of this project was to develop a wind generator that utilizes 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 vortex shedding, both as independent and cooperative devices. The behavior of single devices was studied, but more interestingly, the way that multiple devices arranged together can increase power output was studied. It was shown that i

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10

Du, Sijun. "Energy-efficient interfaces for vibration energy harvesting." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/270359.

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Ultra low power wireless sensors and sensor systems are of increasing interest in a variety of applications ranging from structural health monitoring to industrial process control. Electrochemical batteries have thus far remained the primary energy sources for such systems despite the finite associated lifetimes imposed due to limitations associated with energy density. However, certain applications (such as implantable biomedical electronic devices and tire pressure sensors) require the operation of sensors and sensor systems over significant periods of time, where battery usage may be imprac

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11

Bakhtiari, Nejad Marjan. "Dynamics of Multi-functional Acoustic Holograms in Contactless Ultrasonic Energy Transfer Systems." Diss., Virginia Tech, 2020. http://hdl.handle.net/10919/102414.

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Contactless ultrasonic power transfer (UPT), using piezoelectric transducers, is based on transferring energy using acoustic waves, in which the waves are generated by an acoustic source or transmitter and then transferred through an acoustic medium such as water or human tissue to a sensor or receiver. The receiver then converts the mechanical strain induced by the incident acoustic waves to electricity and delivers to an electrical load, in which the electrical power output of the system can be determined. The execution and efficiency of this technology can be significantly enhanced through

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12

Cardoso, Tárik Kaiel Machado. "Transdutores a fibra ótica baseados em redes de período longo em cascata para avaliação da mistura petrodiesel-biodiesel." Universidade Tecnológica Federal do Paraná, 2010. http://repositorio.utfpr.edu.br/jspui/handle/1/903.

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CAPES; FINEP; Fundação Araucária<br>O biodiesel desponta como uma das mais promissoras alternativas ambientalmente corretas aos combustíveis fósseis. A falta de um sensor apropriado para medir sua quantidade na mistura petrodiesel-biodiesel surge como uma grande oportunidade de pesquisa. Este trabalho apresenta um estudo sobre a fabricação e a caracterização de dispositivos intrínsecos a fibra ótica com o intuito de constituir um transdutor capaz de determinar a concentração de biodiesel presente em misturas petrodiesel-biodiesel. A gravação destes dispositivos, as redes de período longo, foi

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13

Ghasemi, Negareh. "Improving ultrasound excitation systems using a flexible power supply with adjustable voltage and frequency to drive piezoelectric transducers." Thesis, Queensland University of Technology, 2012. https://eprints.qut.edu.au/61091/1/Negareh_Ghasemi_Thesis.pdf.

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The ability of a piezoelectric transducer in energy conversion is rapidly expanding in several applications. Some of the industrial applications for which a high power ultrasound transducer can be used are surface cleaning, water treatment, plastic welding and food sterilization. Also, a high power ultrasound transducer plays a great role in biomedical applications such as diagnostic and therapeutic applications. An ultrasound transducer is usually applied to convert electrical energy to mechanical energy and vice versa. In some high power ultrasound system, ultrasound transducers are applied

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14

Cremonezi, Alcides Oliveira. "Projeto de transdutor de corrente elétrica para alta tensão com nova abordagem de detecção magnetostritiva e sensoriamento óptico, utilizando Terfenol-D e grade de Bragg em fibra óptica." [s.n.], 2011. http://repositorio.unicamp.br/jspui/handle/REPOSIP/258978.

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Orientador: Elnatan Chagas Ferreira<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de Computação<br>Made available in DSpace on 2018-08-19T01:27:01Z (GMT). No. of bitstreams: 1 Cremonezi_AlcidesOliveira_M.pdf: 4474466 bytes, checksum: 5a33efaeb2ab330c00861ab393b6c732 (MD5) Previous issue date: 2011<br>Resumo: Os sensores a fibra óptica são imunes à interferência eletromagnética (EMI), eles são normalmente encontrados em ambientes eletricamente ruidosos, especialmente em linhas de transmissão de alta voltagem. Essa é a característica principa

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15

Kiyono, César Yukishigue. "Projeto de transdutores piezocompósitos de casca multi-camada utilizando o método de otimização topológica." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/3/3152/tde-30072013-210104/.

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Transdutores baseados em cascas piezocompósitas têm uma vasta aplicação no campo de estruturas inteligentes, principalmente como atuadores, sensores e coletores de energia. Essas estruturas piezocompósitas são geralmente compostas por dois ou mais tipos de materiais, como por exemplo materiais piezelétricos, ortotrópicos elásticos (possuem fibras de reforçamento) e isotrópicos (materiais homogêneos). Vários fatores devem ser considerados no projeto de transdutores baseados em cascas piezocompósitas, como o tamanho, a forma, a localização e a polarização do material piezelétrico, bem como a ori

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16

Bäckström, Thomas. "Integrated energy transducer drive for hybrid electric vehicles." Doctoral thesis, KTH, Elkraftteknik, 2000. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-2990.

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17

Varela, Ruben Andres Salas. "Projeto dinâmico de estruturas piezocompósitas laminadas (EPLA) utilizando o método de otimização topológica (MOT)." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/3/3152/tde-26062017-133333/.

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Materiais piezocompósitos laminados são compostos por camadas de material piezelétrico, metálico e compósito (matriz epóxi com fibras de carbono ou de vidro), que possibilitam obter vantagens em relação aos materiais piezelétricos convencionais, permitindo obter características superiores que não podem ser conseguidas pelos seus componentes de forma isolada como, por exemplo, maior flexibilidade e resistência mecânica ou menor peso. Sob esse enfoque, este trabalho tem por objetivo o desenvolvimento de Estruturas Piezocompósitas Laminadas (EPLA) que consistem basicamente em estruturas multicama

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18

Шинкаренко, В. Ф., А. А. Шиманская та Ю. В. Гайдаенко. "Принципы управления структурной эмерджентностью при создании сложных технических систем с электромеханическими преобразователями энергии". Thesis, Сумский государственный университет, 2016. http://essuir.sumdu.edu.ua/handle/123456789/46803.

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Свойство эмерджентности относится к категории общесистемных свойств, которое проявляется на различных уровнях структурной организации и этапах жизненного цикла систем, независимо от их физической природы. Cущность эмерджентности состоит в том, что произвольная целостная система обладает особыми свойствами (системным эффектом), отсутствующими в ее составляющих, т.е., свойствами, которые при декомпозиции системы исчезают.

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19

Bäckström, Thomas. "Integrated enerty transducer drive for hybrid electric vehicles." Doctoral thesis, KTH, Electric Power Systems, 2000. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-2990.

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20

Deterre, Martin. "Toward an energy harvester for leadless pacemakers." Phd thesis, Université Paris Sud - Paris XI, 2013. http://tel.archives-ouvertes.fr/tel-00868838.

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This work consists in the development and design of an energy harvesting device to supply power to the new generation pacemakers, miniaturized leadless implants without battery placed directly in heart chambers. After analyzing different mechanical energy sources in the cardiac environment and associated energy harvesting mechanisms, a concept based on regular blood pressure variation stood out: an implant with a flexible packaging that transmits blood forces to an internal transducer. Advantages compared to traditional inertial scavengers are mainly: greater power density, adaptability to hea

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21

Carter, David. "Interactions between energy transducer TonB and ferric hydroxamate transport proteins from «Escherichia coli»." Thesis, McGill University, 2010. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=86876.

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The ferric hydroxamate uptake (Fhu) system of Escherichia coli transports ferric hydroxamate-type siderophores. This system comprises outer membrane (OM) receptor FhuA, periplasmic binding protein FhuD, and ABC permease FhuB/C. In addition, transport through FhuA requires energy input provided by the cytoplasmic membrane (CM)-embedded TonB/ExbB/ExbD multi-protein complex.<br>This thesis focuses on identification and characterization of protein-protein interactions that facilitate siderophore transport. Phage display technology predicted protein-protein interactions involved in TonB-dependen

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22

Domme, Daniel Joseph. "Experimental and Analytical Characterization of a Transducer for Energy Harvesting Through Electromagnetic Induction." Thesis, Virginia Tech, 2008. http://hdl.handle.net/10919/32112.

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Advances in mechatronics have renewed interest in the harvesting and storage of ambient vibration energy. This work documents recent efforts to model a novel electromagnetic transducer design that is intended for use in energy harvesting. The thesis details methods of experimental characterization as well as model validation. Also presented are methods of state space and parametric modelling eforts. In addition, this thesis presents equivalent electrical circuit models with a focus on switched pulse-width-modulated topologies that seek to maximize harvested energy.<br>Master of Science

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23

Kloub, Hussam Abdelhamid [Verfasser], and Yiannos [Akademischer Betreuer] Manoli. "High effectiveness micro electro mechanical capacitive transducer for kinetic energy harvesting = Hocheffizienter mikroelektromechanischer kapazitiver Wandler für bewegungsbasiertes Energy Harvesting." Freiburg : Universität, 2011. http://d-nb.info/1123468230/34.

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24

Kawano, Marianne Sumie. "Aplicação de transdutores óticos para a monitoração da qualidade de biocombustíveis." Universidade Tecnológica Federal do Paraná, 2015. http://repositorio.utfpr.edu.br/jspui/handle/1/1930.

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CAPES; CNPq; Fundação Araucária<br>No presente trabalho foram estudadas as respostas de sensores óticos baseados em rede de período longo em cascata (CLPG) na avaliação de biocombustíveis (biodiesel de soja e etanol) em diferentes situações de não conformidade, simulando casos de possíveis adulterações ou ainda falhas no processo de fabricação. Para tanto, os dispositivos serviram como transdutores de índice de refração das substâncias analisadas. Em uma das aplicações dos sensores foram avaliadas misturas entre biodiesel de soja e óleo de soja comercial, sendo observado o desempenho do sensor

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25

Sanches, Fabricio Marqui. "Sistema de geração e armazenamento de energia elétrica utilizando transdutor piezelétrico na forma pulsada /." Ilha Solteira, 2015. http://hdl.handle.net/11449/132420.

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Orientador: Nobuo Oki<br>Banca: João Antonio Pereira<br>Banca: Giuliano Pierre Estevam<br>Resumo: Neste trabalho é investigada a viabilidade energética do emprego de buzzers piezelétricos, circuito retificador de onda completa e conversor DC-DC elevador em um sistemas de power harvesting submetido a esforços mecânicos causados pelo tráfego de veículos e/ou caminhar de pedestres, demonstrando a possibilidade de reutilização dessa energia no carregamento de baterias para alimentação de circuitos autônomos de monitoramento, indicação, iluminação, etc., em locais remotos, eliminando ou estendendo

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26

Wei, Jie. "Circuits de récupération d’énergie très basse puissance pour transducteurs à capacité variable." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS220.

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La récupération d'énergie mécanique de vibration à l’aide de transducteurs à capacité variable mène à l’étude de systèmes non linéaires complexes, mais présente des perspectives applicatives très prometteuses. Notre travail a porté sur l’étude d’une nouvelle famille de circuits d'interface pour transducteurs capacitifs. Entre autres avantages, ces circuits sont réalisables avec des rendements élevés à très basse puissance, typiquement dès quelques dizaines de nano-watts de puissance moyenne, ce qui les distingue des solutions présentées dans de l’état de l’art. De plus, Les circuits étudiés da

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Santos, Maraiza Prescila dos. "Sistema eletrônico energeticamente autônomo com colheita de energia por indução magnética." Universidade Federal da Paraíba, 2015. http://tede.biblioteca.ufpb.br:8080/handle/tede/8455.

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Submitted by Morgana Silva (morgana_linhares@yahoo.com.br) on 2016-07-27T17:45:52Z No. of bitstreams: 1 arquivototal.pdf: 2648831 bytes, checksum: 9541497365622df815ae71c695bd6f89 (MD5)<br>Made available in DSpace on 2016-07-27T17:45:52Z (GMT). No. of bitstreams: 1 arquivototal.pdf: 2648831 bytes, checksum: 9541497365622df815ae71c695bd6f89 (MD5) Previous issue date: 2015-02-24<br>In recent decades, the growing demand for miniaturized, portable and autonomous electronics has intensified the search for new and appropriate energy sources. Following this context, the purpose of this work is

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Risquez, Sarah. "Microsystème électrostatique tridimensionnel de récupération d'énergie pour alimenter un stimulateur cardiaque sans sonde." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS044/document.

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Cette thèse s’inscrit dans un contexte d’activité en forte croissance dans le domaine des implants médicaux, stimulée par de nombreux progrès dans le domaine des micro-capteurs et de la micro-électronique. L’autonomie en énergie des implants demeure cependant un facteur limitant. Notre travail a pour objectif de repousser les limites actuelles en termes de miniaturisation et de durée de vie. Il contribue au développement d’une solution basée sur la récupération d’énergie mécanique du cœur pour alimenter durablement un pacemaker miniaturisé sans sonde de nouvelle génération, dit « pacemaker lea

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Pignatti, Alex Almeida. "O impacto da topologia de conexão de transdutores na obtenção de indicadores de qualidade de energia." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/3/3143/tde-15072013-154428/.

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A Agência Nacional de Energia Elétrica (ANEEL) deverá estabelecer a regulamentação para distúrbios de qualidade de energia em um futuro próximo. Há ainda questões em aberto sobre os procedimentos de medição e limites máximos para os indicadores de qualidade de energia. Este trabalho aborda uma dessas questões, que é a conexão de transdutores e os impactos nos índices de qualidade de energia associados. Simulações em ATPDraw e campanhas de medição foram realizadas de modo a identificar o comportamento dos indicadores de distorção harmónica sob as duas configurações possíveis de conexão de trans

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Huang, Tianwen. "Study of Self-Biased Magnetoelectric Materials for Future Micro Energy Sources." Electronic Thesis or Diss., Sorbonne université, 2024. http://www.theses.fr/2024SORUS224.

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Cette thèse mène une étude approfondie sur les composites magnétoélectriques (ME) auto-polarisés fabriqués par la technologie de pulvérisation RF : ces composites pourraient répondre aux besoins d'énergie dans les applications de l'Internet des objets (IoT) et être utilisés pour des applications d'implants biomédicaux grâce au transfert d'énergie sans contact via un champ magnétique. Cette caractéristique permet non seulement de réduire l'utilisation de piles et de batteries, mais aussi de diminuer les besoins de maintenance des implants. Avec le déploiement généralisé des appareils IoT, il ex

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Malleron, Kevin. "Modélisation multiphysique, caractérisation et conception de transducteurs magnétoélectriques pour l'alimentation de capteurs biomédicaux autonomes." Thesis, Sorbonne université, 2018. http://www.theses.fr/2018SORUS203.

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Afin d'éviter une opération de remplacement de la batterie d'un dispositif biomédical, nous proposons d'utiliser une technique innovante de rechargement sans fils utilisant des matériaux magnétoélectriques. L'effet magnétoélectrique extrinsèque est principalement issu de la combinaison de deux phénomènes : piézoélectricité et magnétostriction. L'idée est de réaliser une transmission d'énergie sans fils basée sur les techniques d'induction en champ proche : on applique un champ magnétique, le récepteur qui servira de transducteur d'énergie sera composé d'un matériau magnétostrictif, qui, sous l

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Cleante, Vinícius Germanos. "An investigation into harvesting energy from sleeper vibration due to a passing train /." Ilha Solteira, 2019. http://hdl.handle.net/11449/191195.

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Orientador: Michael John Brennan<br>Abstract: The advances in microelectromechanical systems to power supply devices for monitoring the structural integrity, mainly for applications in remote areas or with difficult access, have made energy harvesting from ambient vibration a highly researched topic. Although several electromechanical mechanisms have been proposed for applications in a variety of fields, harvesting energy from railway track vibrations is relatively new, and only a small amount of research is ongoing in this topic. This thesis aims to determine the factors that govern the sleep

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Laaraibi, Abdo-rahmane Anas. "Development of an autonomous system based on piezoresistive sensors for quantitative sports movement." Electronic Thesis or Diss., Université de Rennes (2023-....), 2024. http://www.theses.fr/2024URENE001.

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L’analyse du mouvement humain intervient dans de nombreux domaines, permettant par exemple de comprendre les subtilités de la performance physique ou de la biomécanique. Les données et les informations issues de cette analyse des mouvements peuvent permettre d’améliorer les performances, de prévenir les blessures ou d’optimiser la rééducation. De nombreux systèmes existent comme la vidéo, mais sa mise en place et le traitement des données constituent des limites. Une solution consiste à développer des systèmes portables intégrés offrant un suivi discret et continu des activités. Les enjeux se

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Souza, Flavilene da Silva. "Extração de energia através da técnica power harvesting baseada em vibrações mecânicas e transdutores piezelétricos." Universidade Estadual Paulista (UNESP), 2018. http://hdl.handle.net/11449/153706.

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Submitted by FLAVILENE DA SILVA SOUZA (flavilener3@gmail.com) on 2018-04-24T19:08:16Z No. of bitstreams: 1 tese_flavilene_final.pdf: 13353047 bytes, checksum: d43d4d8f0c658e67b155882a0640ae05 (MD5)<br>Approved for entry into archive by Cristina Alexandra de Godoy null (cristina@adm.feis.unesp.br) on 2018-04-24T19:20:49Z (GMT) No. of bitstreams: 1 souza_fs_dr_ilha.pdf: 13353047 bytes, checksum: d43d4d8f0c658e67b155882a0640ae05 (MD5)<br>Made available in DSpace on 2018-04-24T19:20:49Z (GMT). No. of bitstreams: 1 souza_fs_dr_ilha.pdf: 13353047 bytes, checksum: d43d4d8f0c658e67b155882a0640ae05

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Lombardi, Giulia. "Unified nonlinear electrical interfaces for hybrid piezoelectric-electromagnetic small-scale harvesting systems." Thesis, Lyon, 2020. http://www.theses.fr/2020LYSEI101.

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Ce travail de recherche présente des interfaces électroniques non-linéaires pour des systèmes hybrides de récupération d'énergie combinant des transducteurs piézoélectriques et électromagnétiques. Ces systèmes ont reçu un grand intérêt en raison de leur capacité à convertir les vibrations mécaniques en énergie électrique suffisante pour alimenter des capteurs à faible puissance. Afin d'alimenter ces appareils microélectroniques, une fois l'énergie convertie, une extraction efficace et intelligente doit être mise en place avec une unité dédiée. Les interfaces hybrides non-linéaires proposées da

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Saddi, Zied. "Conception d'un dispositif de récupération d'énergie mixte vibratoire-électromagnétique pour l'alimentation des dispositifs à faible consommation." Thesis, Paris Est, 2016. http://www.theses.fr/2016PESC1065/document.

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L’alimentation des systèmes communicants à partir des sources d’énergies existantes dans l’environnement est une solution pertinente pour prolonger leur autonomie énergétique. Cela peut permettre de s’affranchir des sources d’énergie embarquées comme les piles et les batteries, qui présentent une durée de vie limitée, nécessite un remplacement périodique et un coût de recyclage. Parmi les sources d’énergies récupérables, les ondes électromagnétiques et les vibrations mécaniques sont considérées parmi les plus prometteuses en raison de leur disponibilité notamment dans les milieux urbains. Notr

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Guillemet, Raphaël. "Etude et réalisation d'un récupérateur d'énergie vibratoire par transduction électrostatique en technologie MEMS silicium." Thesis, Paris Est, 2012. http://www.theses.fr/2012PEST1082/document.

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Une solution pertinente afin d'alimenter des capteurs isolés consiste à récupérer l'énergie disponible dans leur environnement immédiat. Parmi les sources d'énergie envisageables, notre choix s'est porté sur les vibrations mécaniques ambiantes. Notre contribution porte sur l'étude et la réalisation, par un procédé de fabrication collective, d'un transducteur électrostatique sans électrets en technologie MEMS Silicium. Nous proposons une étude analytique permettant d'optimiser l'efficacité du générateur électrostatique, tout en considérant une limite sur la tension maximale aux bornes du transd

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Maaroufi, Seifeddine. "Conception et réalisation d’un banc pour l’étude de fiabilité des micros dispositifs piézoélectriques de récupération d’énergie dédiés aux implants cardiaques." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS187/document.

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Dans le cadre de cette thèse de doctorat, nous présentons la conception et la réalisation d’un banc dédié à l’étude de la fiabilité de structures piézoélectriques et plus précisément des micro-dispositifs de récupération d'énergie destinés aux implants médicaux autonomes actifs (stimulateurs cardiaques de nouvelle génération). Les structure étudiées se présentent sous la forme d’un bimorphe piézoélectrique encastré-libre comportant une masse sismique à leur extrémité. Une bonne compréhension du vieillissement des matériaux et des modes de défaillance mécanique et électrique est essentielle pou

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Boisseau, Sébastien. "Récupération d'énergie vibratoire à électrets." Phd thesis, Université de Grenoble, 2011. http://tel.archives-ouvertes.fr/tel-00644697.

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Issus de l'industrie de la microélectronique, les MEMS (Micro Electro Mechanical Systems) envahissent progressivement le marché avec des applications dans de nombreux domaines tels que l'aérospatiale, la médecine, l'industrie ou encore le grand public. Une des vocations de ces microstructures est de permettre le déploiement de réseaux de capteurs autonomes, c'est-à-dire d'un ensemble de systèmes capables de collecter des informations de leur environnement, de les traiter, de les transmettre et d'interagir entre eux, et ceci, sans intervention humaine. Comment rendre ces microsystèmes énergétiq

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Zhou, Biao. "Etude de l'amortissement piézoélectrique shunté appliqué aux roues aubagées désaccordées." Phd thesis, Ecole Centrale de Lyon, 2012. http://tel.archives-ouvertes.fr/tel-00945457.

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Ce travail porte sur l'étude d'amortissement piézoélectrique shunté pour les roues aubagées désaccordées de turbomachines. Les problèmes vibratoires sont de première importance pour les motoristes aéronautiques et, parmi ceux-ci, les vibrations causées par le désaccordage des aubes tiennent une place importante puisqu'elles sont à l'origine des phénomènes de fatigue oligocyclique et des risques de défaillance associés. L'usage de technologies d'amortissement est donc assez répandu pour réduire l'amplitude vibratoire. Ici, on s'intéresse à l'étude de l'amortissement piézoélectrique shunté appli

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Chen, Chia-Wen, and 陳嘉雯. "Research on energy transfer by ultrasonic transducers." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/26jnv6.

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碩士<br>國立雲林科技大學<br>機械工程系碩士班<br>96<br>The thesis explores wireless energy transfer via ultrasonic transducers. Similar to the commonly used “electromagnetic induction” methods which exploit the resonance in electromagnetic fields, this research is based on the resonance of ultrasonic waves in a pair of piezoelectric transmitter and receiver. A concentric holding tool is first devised to ensure good alignment of the pair of transducers. In the resistance-load experiments it is found that maximum energy can be transferred if the load resistor is 1.922kΩ, and the frequency of ultrasound is

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Khan, Mohammed Asadullah. "Magnetic Polymer Composite Transducers for Integrated Systems." Diss., 2019. http://hdl.handle.net/10754/660156.

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Compact, autonomous computing systems with integrated transducers are imperative to deliver advances in healthcare, navigation, livestock monitoring, point of care diagnostics, remote sensing, internet-of-things applications, smart cities etc. Reflecting this need, there has been sustained growth in the market for transducers. Polymer based transducers, which meld highly desirable properties such as low cost, light weight, high manufacturability, biocompatibility and flexibility, are quite attractive. Doping polymers with magnetic materials results in the formation of magnetic composite poly

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Chang, Wei-Tsai, and 張瑋才. "Study of thin-film piezoelectric transducers for vibration-energy harvesting." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/10863201117593879296.

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博士<br>國立中山大學<br>電機工程學系研究所<br>100<br>The piezoelectric transducer for vibration-energy harvesting is constructed of a piezoelectric layer, bottom electrode and a top electrode. In order to obtain an appropriate transducer for the low-frequency operating; environmentally-friendly and long-term, the flexible substrate, the piezoelectric layer, and the additional mass-loading (tip mass) have been investigated thoroughly. This study investigates the feasibility of a high-performance ZnO and AlN based piezoelectric transducer for vibration-energy harvesting applications. Firstly, the piezoelectric t

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"An extended rotary energy harvester using multiple piezoelectric cantilevers." 2011. http://library.cuhk.edu.hk/record=b5894523.

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Du, Xiaona.<br>Thesis (M.Phil.)--Chinese University of Hong Kong, 2011.<br>Includes bibliographical references (leaves 65-74).<br>Abstracts in English and Chinese.<br>ABSTRACT --- p.i<br>摘要 --- p.iii<br>ACKNOWLEDGEMENTS --- p.iii<br>TABLE OF CONTENTS --- p.iv<br>LIST OF FIGURES --- p.xi<br>LIST OF TABLES --- p.ix<br>Chapter CHAPTER ONE --- INTRODUCTION --- p.1<br>Chapter 1.1 --- Background --- p.2<br>Chapter 1.1.1 --- Development of portable devices --- p.2<br>Chapter 1.1.2 --- Energy harvesting --- p.2<br>Chapter 1.1.3 --- Piezoelectric energy harvesting --- p.5<br>Chapter 1.1.4 --

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Chiu, Jhen-Yao, and 邱鉦耀. "New Polymer-based Capacitive Micromachined Ultrasonic Transducers with Low Resonance Frequency and Low Energy Consumption." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/39291734394465091336.

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碩士<br>國立高雄應用科技大學<br>機械與精密工程研究所<br>103<br>The purpose of this thesis is to improve ultrasound attenuation in the air by reducing acoustic frequency of the capacitive micromachined ultrasonic transducer (CMUT). The ultrasound attenuation decreases with lower natural resonant frequency of membrane. There are three critical factors affecting natural resonant frequency of membrane including diameter, thickness and vibration mode. A new polymer-based CMUT with a large membrane diameter of 300m is developed to achieve low attenuation in the air. In this study, the center deflection and natural res

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Chen, Yu-Yin, and 陳昱因. "Piezoelectric power transducers and its'' interfacing circuitry on energy harvesting and structural damping applications." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/11004090983056704125.

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博士<br>國立臺灣大學<br>應用力學研究所<br>101<br>Nowadays with the world oil price soaring, the energy issue is becoming a significant topic and the possibility of harvesting ambient energy receiving much attention. In this dissertation, the main topic surrounds improving the piezoelectric energy harvesting device in several aspects and the final objective is to integrate it with low power consumption device, for example a wireless sensor network node to extend the battery lifetime and further supply the energy to device directly. Based on the high mechanical quality factor of the structure, the output power

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Smith, Keith Cameron. "Coupled Dynamic Analysis of Flow in the Inlet Section of a Wave Rotor Constant Volume Combustor." 2011. http://hdl.handle.net/1805/2969.

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Indiana University-Purdue University Indianapolis (IUPUI)<br>A wave rotor constant volume combustor (WRCVC) was designed and built as a collaborative work of Rolls Royce LibertyWorks, Indiana University-Purdue University at Indianapolis (IUPUI), and Purdue University, and ran experimental tests at Purdue's Zucrow Laboratories in 2009. Instrumentation of the WRCVC rig inlet flow included temperature and pressure transducers upstream of the venturi and at the fuel delivery plane. Other instrumentation included exhaust pressures and temperatures. In addition, ion sensors, dynamic pressure senso

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Chang, Wei-Chen, and 張維辰. "Design and Implementation of an Ultrasonic Transducer Energy Harvester Circuit with Mechanical Wave Wireless Charging." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/65669669347801533483.

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碩士<br>國立臺灣大學<br>電子工程學研究所<br>102<br>This thesis presents an ultrasonic transducer energy harvester interface circuit. This circuit can apply to the receiver of wireless power transmitter system with mechanical wave. The ultrasonic transducer is made of piezoelectric material, which can convert between electrical and mechanical energy. However, the performance of conventional energy harvesters are limited by the electrical characteristic of the piezoelectric, which leads to low efficiency. In addition, the harvested power of it will be affected by the load variation. This thesis utilizes the sy

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Alotaibi, Ahmed Mohammed. "Development of a Mechatronics Instrument Assisted Soft Tissue Mobilization (IASTM) Device to Quantify Force and Orientation Angles." Thesis, 2016. http://hdl.handle.net/1805/10333.

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Indiana University-Purdue University Indianapolis (IUPUI)<br>Instrument assisted soft tissue mobilization (IASTM) is a form of massage using rigid manufactured or cast devices. The delivered force, which is a critical parameter in massage during IASTM, has not been measured or standardized for most clinical practices. In addition to the force, the angle of treatment and frequency play an important role during IASTM. As a result, there is a strong need to characterize the delivered force to a patient, angle of treatment, and stroke frequency. This thesis proposes two novel mechatronic designs f

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Rutherford, C., C. Speirs, Jamie J. L. Williams, et al. "Phosphorylation of Janus kinase 1 (JAK1) by AMP-activated protein kinase (AMPK) links energy sensing to anti-inflammatory signaling." 2016. http://hdl.handle.net/10454/10881.

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yes<br>AMP-activated protein kinase (AMPK) is a pivotal regulator of metabolism at the cellular and organismal levels. AMPK also suppresses inflammation. We found that pharmacological activation of AMPK rapidly inhibited the Janus kinase (JAK)–signal transducer and activator of transcription (STAT) pathway in various cells. In vitro kinase assays revealed that AMPK directly phosphorylated two residues (Ser515 and Ser518) within the SH2 domain of JAK1. Activation of AMPK enhanced the interaction between JAK1 and 14-3-3 proteins in cultured vascular endothelial cells and fibroblasts, an ef

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