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Статті в журналах з теми "Piezoelectric engine"
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Shi, Shuxin, Qiuqin Yue, Zuwei Zhang, Jun Yuan, Jielin Zhou, Xiaokun Zhang, Shan Lu, Xin Luo, Chongyu Shi, and Hua Yu. "A Self-Powered Engine Health Monitoring System Based on L-Shaped Wideband Piezoelectric Energy Harvester." Micromachines 9, no. 12 (November 28, 2018): 629. http://dx.doi.org/10.3390/mi9120629.
Повний текст джерелаАнотація:
Engine health monitoring is very important to maintain the life of engines, and the power supply to sensor nodes is a key issue that needs to be solved. The piezoelectric vibration energy harvester has attracted much attention due to its obvious advantages in configuration, electromechanical conversion efficiency, and output power. However, the narrow bandwidth has restricted its practical application. A self-powered engine health monitoring system was proposed in this paper, and an L-shaped wideband piezoelectric energy harvester was designed and implemented. The L-shaped beam-mass structure and the piezoelectric bimorph cantilever beam structure was combined to form the wideband piezoelectric energy harvester configuration, which realized effective output at both resonance points. The theoretical model and finite element simulation analysis of the wideband piezoelectric energy harvester were proposed and the parameters were optimized based on that to meet the requirement of the vibration frequency of the engine. The experimental results show that the proposed energy harvester can be applied into the automobile engine health monitoring system. Engine signal analysis results also demonstrate that the proposed system can be used for engine health monitoring.
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Azin, A. V., S. A. Kuznetsov, S. A. Ponomarev, S. V. Ponomarev, and S. V. Rikkonen. "Mathematical modeling of piezoelectric step-engine work." Spacecrafts & Technologies 3, no. 3 (2019): 164–70. http://dx.doi.org/10.26732/2618-7957-2019-3-164-170.
Повний текст джерелаАнотація:
In the article the results of new piezoelectric step-engine research are presented. The original construct of piezoelectric step-engine is contained in special engineering lever called grab device that can organize back and forward rod’s motion with only one piezo element activity. To choose the effective process of piezoelectric step-engine work the mathematical model was created. This mathematical model describes inner piezoelectric step-engine process like a non-linear vibrational system. The mathematical model identifies speed of piezoelectric step-engine elements over the vibration period with different frequency, load level and voltage. The prototype of piezoelectric step-engine was produced. Experimental issues were conducted. Piezoelectric step-engine’s technical specifications are positioning accuracy over 10–6 meter, speed of movement over 10 mm per minute with weight of load to 1 kg and voltage to 100 Volt. On the results of experimental research it is defined that mathematical model enables to model working process of piezoelectric stepengine with an error not more than 10 %. This research verifies viability of proposed construction and provides the way to increase output power of piezoelectric step-engine.
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Wróbel, Radosław, Monika Andrych-Zalewska, Wojciech Ambroszko, and Szymon Fryda. "Practical application of wavelets in the engine's vibroacoustic analysis." AUTOBUSY – Technika, Eksploatacja, Systemy Transportowe 19, no. 12 (December 31, 2018): 282–84. http://dx.doi.org/10.24136/atest.2018.399.
Повний текст джерелаАнотація:
Vibrations are most often measured using ceramic piezoelectric sensors - accelerometers. The accelerometer uses a piezoelectric effect to measure the dynamic acceleration of its housing. They are mounted directly on the measuring system (moving or rotating, such as gearboxes, rotating blades, turbine engines or bearings). This is not their only use, because they can also be used in shock measurements, such as NCAP in the field of automotive safety or diagnostics (unfortunately they have lower accuracy than low-frequency LDV). The main advantage of using a piezoelectric accelerometer is its linearity in a wide range frequency and a huge range of work dynamics. Engine vibration measurements are usually made at different points of the engine to be independent of each other. The engine block is a characteristic measuring point because it is best available. Accelerometers are assembled by glue, screwing or magnetic connection. The obtained vibroacoustic signal is most often analyzed using Fourier analysis. The following article presents another possibility of on-line analysis: short-term wavelet analysis "on-line".
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Wang, Xin Li, and Xu Ping. "Hardware Design of Nature Gas Engine ECU Based on Single Chip." Applied Mechanics and Materials 575 (June 2014): 576–79. http://dx.doi.org/10.4028/www.scientific.net/amm.575.576.
Повний текст джерелаАнотація:
Gas supply method plays an important role in engine performance for natural gas engines (NGE). In order to overcome the low charging efficiency of pre-mixed fuel gas supply method the multi-point injection (MPI) gas engine controller hardware system is designed in this paper. For the nature gas engine controller the main controller is selected as the microcontroller MC9S12XSl28, then the circuitry for semiconductor piezoelectric air pressure sensor, potentiometer throttle position, thermistor temperature sensor, a magnetic-electric sensor for detecting the top dead center (TDC) and simulating engine speed are designed. What have done above is the base of software design. Key Words: nature gas engine; controller; hardware design
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Azin, A. V., S. A. Kuznetsov, S. A. Ponomarev, S. V. Ponomarev, and S. V. Rikkonen. "Simulation of contact interaction of piezoelectric engine elements." Spacecrafts & Technologies 3, no. 4 (December 25, 2019): 222–29. http://dx.doi.org/10.26732/2618-7957-2019-4-222-229.
Повний текст джерелаАнотація:
In the article the results of a new type of piezo-electric step-engine research are presented. The original construct of piezo-electric step-engine is contained in special engineering lever called grab device that can organize back and forward rod’s motion with only one piezo element activity. To choose the effective process of piezo-electric step-engine work the mathematical model was created. This mathematical model describes inner piezo-electric step-engine process with features of contact and electroelastic deformation. Using the ANSYS application package, а finite element model of the piezo-electric step-engine has been developed. This finite element model allows estimate the stress-strain state of structural elements of the piezo-electric step-engine and determine the effective step-by-step operation mode of the piezo-electric step-engine. Using the finite element model, the influence of the piezo-electric step-engine operating mode parameters on the amount of displacement of the rod is studied. According to results of experimental studies, the proposed numerical model allows to simulate the dynamic process of step-operation of a piezo-electric step-engine with an error of no more than 6 %. This finite element model include the external load on piezo-electric step-engine and can be used to design piezo-electric step-engine of various fields of application.
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Shijer, Sameera Sadey. "Simulation of Piezoelectric in Engine Knock Sensor with Different Frequency Modes." ECS Transactions 107, no. 1 (April 24, 2022): 17271–88. http://dx.doi.org/10.1149/10701.17271ecst.
Повний текст джерелаАнотація:
A numerical study on deformation piezoelectric sensors is described in this study. Major objectives of this research are to compare the impacts of direct current voltage on piezoelectric structure, the effects of direct current voltage on the resonance frequency of piezoelectric knock sensors, and the effects of these parameters on the sensitivity and accuracy of the sensors. The impedance properties of the transient structure are studied under different engine operating conditions and in relation to various forms of sensor damage. Determining the degree of damage sensors and the prediction quality of the piezoelement within the sensor may be accomplished by measuring material flaws and fluctuations in material coefficients that are connected to the frequency characteristic of the sensor. To some extent, the preceding can be used in the calculations of several structural parts of knock sensors. On a prototype knock sensor, ranges of modes were tested using piezoelectric elements with varying numbers of cracks. In this work, it has discussed seven scenarios of frequency analysis to examine the piezoelectric in engine knock sensor with different electricity modes of operation. These scenarios include the engine normal operation mode, start engine operation mode, and different frequency of operation mode (2Hz, 200Hz, 2KHz, 20KHz, 200KHz).
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Khalatkar, A. M., and V. K. Gupta. "Piezoelectric energy harvester for low engine vibrations." Journal of Renewable and Sustainable Energy 9, no. 2 (March 2017): 024701. http://dx.doi.org/10.1063/1.4979501.
Повний текст джерела
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Pipitone, E., and L. D'Acquisto. "Development of a low-cost piezo film-based knock sensor." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 217, no. 8 (August 1, 2003): 691–99. http://dx.doi.org/10.1243/09544070360692087.
Повний текст джерелаАнотація:
It is well known that spark advance is a key parameter in spark ignition engine management. Increasing fuel cost and emission regulation strictness require a higher engine efficiency, which can be improved by an accurate regulation of the spark advance. Under high load conditions, an optimal spark advance choice leads the engine to run next to the knock limit, so the management and control system needs to be equipped with a knock sensor in order to preserve the engine from damage. The authors developed a low-cost knock sensor whose sensing element is a thin washer of polyvinylidine fluoride (PVDF), a fluoropolymer characterized by a great piezoelectric e ect if polarized. The sensor has been tested on a spark ignition CFR engine (the standard single-cylinder test engine used by ASTM for octane number determination of spark ignition engine fuel) and compared with a commercial accelerometer and a pressure sensor, in terms of knocking detection capability, measured knock intensity (KI) and signal-to-noise ratio (SNR). Knocking tests have also been carried out on a Renault series production engine. The collected data show that PVDF ensures a reliable detection of knock, a precise measurement of knock energy and accurate information about the frequency content of the perceived vibration. The sensor worked for several hours without depolarizing and, above all, owing to the great piezoelectric e ect of PVDF, the use of a charge amplifier was unnecessary. PVDF proved to have great potential as a knock detector in spark ignition engines at a very low cost.
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Yanaseko, Tetsuro, Hiroshi Sato, Isao Kuboki, Karla Mossi, and Hiroshi Asanuma. "Vibration Viscosity Sensor for Engine Oil Monitoring Using Metal Matrix Piezoelectric Composite." Materials 12, no. 20 (October 18, 2019): 3415. http://dx.doi.org/10.3390/ma12203415.
Повний текст джерелаАнотація:
Lubricants such as engine oil play an important role in preventing machine wear and damage. Monitoring the deterioration of lubricating oils is a significant technical issue in machine maintenance. In this study, a sensor for monitoring engine oil viscosity was developed using a metal-core piezoelectric fiber/aluminum composite. This composite is a piezoelectric ceramic that is reinforced by a metal matrix; it is expected to be utilized in harsh environments such as the inside of an engine. An active type measurement method was employed to monitor variations in the viscosity of glycerin solution as a model liquid. In this method, a self-generated vibration is correlated to the viscosity of a liquid by measuring the damped vibration amplitude and the variation in the resonance frequency. The results showed that the vibration had a high sensitivity to the liquid viscosity; further, it was observed that the shift in resonance frequency correlated to a wider range of measurable viscosity. Both measured parameters indicate that the metal-core piezoelectric fiber/aluminum composite is a viable sensor for engine oil monitoring.
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d’Ambrosio, Stefano, Alessandro Ferrari, Alessandro Mancarella, Salvatore Mancò, and Antonio Mittica. "Comparison of the Emissions, Noise, and Fuel Consumption Comparison of Direct and Indirect Piezoelectric and Solenoid Injectors in a Low-Compression-Ratio Diesel Engine." Energies 12, no. 21 (October 23, 2019): 4023. http://dx.doi.org/10.3390/en12214023.
Повний текст джерелаАнотація:
An experimental investigation has been carried out to compare the performance and emissions of a low-compression-ratio Euro 5 diesel engine featuring high EGR rates, equipped with different injector technologies, i.e., solenoid, indirect-acting, and direct-acting piezoelectric. The comparisons, performed with reference to a state-of-the-art double fuel injection calibration, i.e., pilot-Main (pM), are presented in terms of engine-out exhaust emissions, combustion noise (CN), and fuel consumption, at low–medium engine speeds and loads. The differences in engine performance and emissions of the solenoidal, indirect-acting, and direct-acting piezoelectric injector setups have been found on the basis of experimental results to mainly depend on the specific features of their hydraulic circuits rather than on the considered injector driving system.
Дисертації з теми "Piezoelectric engine"
1
Bertin, Michael. "Piezoelectric actuation of an aero engine fuel metering valve." Thesis, University of Bath, 2017. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.723329.
Повний текст джерелаАнотація:
Servo valves are used in a broad variety of flow modulation applications. In the field of aerospace, servo valves are used in aero engines to meter fuel flow. The existing valves are labour intensive to manufacture and highly optimised such that to achieve improvements in performance requires a novel design. This research investigates smart material actuators and valve concepts. Specifically, a prototype pilot stage nozzle flapper valve is developed for the purpose of actuating a main stage spool. The typical nozzle flapper type servo valve uses a torque motor to actuate the flapper. In this research project, the torque motor has been substituted for two piezoelectric ring bender actuators. A novel mounting mechanism has been developed to secure the ring benders within the valve. Analytical and finite element models have been made to understand the displacement mechanism of a ring bender and the effects of the mount on the displacement and force from a ring bender, and the results were compared with experiment. The mounting stiffness at the inner and outer edges was found to decrease the displacement of the ring bender and it was found that the stiffness of the mount at the outer edge has a greater negative effect on displacement than the stiffness of the mount at the inner edge. The displacement of a ring bender was tested across the operational temperature range of an aero engine. It was found that the displacement of the ring bender is reduced at low temperatures and increases at high temperature. The variation of stiffness of the elastomeric mount was also tested with temperature and it was found that the displacement of a ring bender is significantly reduced when the mounting elastomer approaches its glass transition temperature. A prototype valve was built to test the pressures and flows that could be achieved at two control ports by using a ring bender as actuator. A single ring bender and two ring benders, mounted in tandem to provide redundancy, have been tested. An analytical model was developed and the predictions are compared with experimental results for pressures and flow. The full stroke of the valve was 300m when mounted and reduced to 150m when mounted in tandem with an inactive ring bender. The hysteresis of the valve is +/-10%. The pressures and flow at and between the control ports of the valve are consistent with the predictions.
2
Wekin, Andrew Brian Evans. "Characterization and comparison of piezoelectric materials for transducing power from a thermoacoustic engine." Online access for everyone, 2008. http://www.dissertations.wsu.edu/Thesis/Summer2008/A_wekin_051908.pdf.
Повний текст джерела
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Землянський, Михайло Володимирович. "Дослідження ресурсних характеристик п’єзоелектричного двигуна". Master's thesis, КПІ ім. Ігоря Сікорського, 2019. https://ela.kpi.ua/handle/123456789/31231.
Повний текст джерелаАнотація:
Магістерська дисертація містить пояснювальну записку на 91 сторінках формату А4, 40 ілюстрацій, 25 таблиці, 31 літературне джерело, 1 додаток.
В даній роботі розглянуті ресурсні характеристики реверсивного п’єзоелектричного двигуна на прикладі двигуна РМ-20Я8. Головною характеристикою п’єзоелектричних двигунів, яка дозволяє порівняти їх з іншими електродвигунами є коефіцієнт корисної дії (ККД). Оцінка цього параметру для п’єзоелектричних двигунів досить складна, оскільки ККД залежить від конструкції цих двигунів, сили і кута притиску штовханів до ротора та матеріалу самого ротора. Але основним параметром, який змінюється в процесі ресурсних іспитів двигуна і від якого залежить його ККД, є зміна його моменту самогальмування. Саме тому в основі ресурсної моделі повинні бути покладені експериментальні залежності моменту самогальмування двигуна від кількості напрацьованих ним обертів.
Об’єктом дослідження є ресурсні характеристики п’єзоелектричного двигуна, предметом дослідження - реверсивний п’єзоелектричний двигун.
Досліджено ресурсні характеристики реверсивних п’єзоелектричних двигунів конкретного типу.
Побудовано ресурсну модель ККД реверсивного п’єзоелектричного двигуна в основу якої покладено експериментальні залежності моменту самогальмування від кількості напрацьованих обертів.
В результаті виконання дисертаційної роботи визначено елементи, що мають відношення до ресурсної надійності двигуна.
Ресурсна модель залежності ККД п’єзоелектричного двигуна від моменту самогальмування дає можливість вдосконалити його ресурсні характеристики, забезпечивши цим самим надійність і раціональність використання таких двигунів.The master’s thesis contains an explanatory note on 91 A4 pages, 40 illustrations, 25 tables, 31 literary sources, 1 appendix. This paper discusses the resource characteristics of a reversible piezoelectric motor using the example of the RM-20Y8 engine. The main feature of piezoelectric motors that compares them to other electric motors is the efficiency. The estimation of this parameter for piezoelectric motors is quite difficult, since the efficiency depends on the design of these motors, the force and the angle of pressure of the pushers against the rotor and the material of the rotor itself. But the main parameter that changes in the process of engine resource tests and on which its efficiency depends, is the change in its torque. That is why the resource model should be based on the experimental dependence of the moment of self-deceleration of the engine on the number of revolutions it has produced. The subject of the study is the resource characteristics of the piezoelectric motor and the subject of the study is the reversible piezoelectric motor. The resource characteristics of reversible piezoelectric motors of a particular type are investigated. A resource model of the efficiency of a reversible piezoelectric motor is constructed, which is based on the experimental dependences of the moment of self-deceleration on the number of revolutions worked. As a result of the dissertation, the elements related to the engine resource reliability were determined. The resource model of the dependence of the piezoelectric motor efficiency on the moment of self-deceleration makes it possible to improve its resource characteristics, thus ensuring the reliability and rational use of such motors.
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Sénéchal, Aurélien. "Réduction de vibrations de structure complexe par shunts piézoélectriques : application aux turbomachines." Phd thesis, Conservatoire national des arts et metiers - CNAM, 2011. http://tel.archives-ouvertes.fr/tel-00862517.
Повний текст джерелаАнотація:
L'objet de cette thèse est d'étudier différents dispositifs d'amortissement de vibrations en basses fréquences des aubes de rotor de soufflante ("fan") d'un turboréacteur. Les solutions étudiées utilisent des pastilles piézoélectriques, liées à l'aube et connectées à un circuit électrique passif ou semi-passif. Dans la première partie, il s'agit de mettre en pratique le modèle électromécanique développé dans la thèse de Julien Ducarne, puis de l'étendre au cas tridimensionnel par l'utilisation de la méthode des éléments finis. Ce modèle de comportement prend en compte le couplage entre une structure mécanique quelconque et des pastilles piézoélectriques planes ou courbes. Par la suite, un modèle réduit à faible nombre de degrés de liberté est construit, ce qui permet après résolution de prédire l'efficacité des dispositifs amortissants. Deux techniques, nommées "shunt" et "switch" sont appliquées au cas d'une aube fan. La première consiste à utiliser un circuit électrique résistif ou résonant. La seconde, encore à l'état de recherche, comporte un circuit muni d'un interrupteur synchronisé aux oscillations de la structure, ce qui produit un amortissement analogue à celui d'un frottement sec. La modélisation et l'optimisation électrique de ces circuits, issus de différents travaux antérieurs, ne font l'objet que d'un rappel dans ce mémoire. Une procédure d'optimisation est développée pour pouvoir trouver les géométries et les emplacements des pastilles qui maximisent le couplage électromécanique. Deux algorithmes différents (recuit simulé et recherche avec liste taboue) sont utilisés et mis en interaction avec les outils de calcul éléments finis pour trouver des solutions optimisées. Afin de valider sur un cas industriel l'ensemble des travaux sur les dispositifs piézoélectriques, une campagne d'essai est menée sur une aube fan de CFM56-7b. Les niveaux d'atténuation mesurés et ceux prévus par le modèle sont ensuite comparés. La seconde partie est consacrée à l'évaluation de l'effet des nonlinéarités géométriques sur la dynamique d'une structure tournante. Initialement prévue pour être intégrée à la partie shunt piézoélectrique, ceci afin de pouvoir estimer l'efficacité de ce dernier lorsque la structure tourne et vibre en grande amplitude, l'étude n'a pas été poursuivie et constitue une partie sans lien avec les techniques de réduction de vibrations. Néanmoins, les résultats obtenus en 1D, ainsi que la méthode de prise en compte des nonlinéarités dans le cas 3D viennent compléter et enrichir les différentes études actuelles menées sur le sujet, raison pour laquelle ce chapitre a été ajouté à ce mémoire. La détermination des caractéristiques dynamiques modales et leurs évolutions en fonction de certains paramètres de fonctionnement de l'aube constituent l'objet de cette partie. Plusieurs modèles sont développés et comparés pour pouvoir juger de la présence et de l'importance des divers phénomènes non linéaires dans la réponse forcée d'une poutre en rotation.
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Monin, Thomas. "Études de systèmes thermo-fluidiques auto-oscillants pour des applications de récupération d'énergie thermique." Thèse, Université de Sherbrooke, 2017. http://hdl.handle.net/11143/11868.
Повний текст джерелаАнотація:
Les progrès technologiques considérables menés depuis ces dernières décennies
nous permettent aujourd’hui de disséminer dans notre environnement une nuée de
noeuds de capteurs communicants combinant la taille micrométrique et la consommation
dérisoire caractéristiques des MEMS avec la puissance des protocoles de
communications Internet. L’Internet des Objets, formé par ce réseau de capteurs,
possède le potentiel d‘optimiser un grand panel d’applications industrielles et domotiques.
Le nouveau défi, que la communauté du Energy Harvesting tente de relever
depuis une décennie maintenant, est de rendre ces noeuds de capteurs autonomes
en les alimentant grâce à l’énergie perdue dans leur environnement.
Dans ces travaux de recherche, nous explorons le potentiel d’un principe thermo-fluidique
auto-oscillant pour la génération d’énergie utile à partir d’une source thermique
de faible qualité. L’implémentation de cette technologie en tant que machine
thermique est étudiée et mène à la caractérisation d’un nouveau cycle thermodynamique
caractéristique du SOFHE (Self Oscillating Fluidic Heat Engine).
Nous montrons, par une approche phénoménologique, que notre machine thermique
se comporte comme un oscillateur mécanique, excité par les évaporations
et condensations successives du fluide de travail. Ces changements de phase alternatifs
mettent en mouvement une colonne d’eau, jouant le rôle de masse, couplée
à une zone de vapeur, jouant le rôle d’un ressort.
Une étude de l’influence du couplage du SOFHE avec un transducteur électromécanique,
représenté par un oscillateur, mène à la conception et la fabrication d’une spirale
piézoélectrique. L’intégration de cette spirale à notre machine thermique forme
un générateur thermo-électrique dont les capacités de conversion sont démontrées
par la charge d’une capacité.
Finalement, la miniaturisation du principe thermo-fluidique SOFHE est rendue possible
par la réalisation d’un procédé de fabrication utilisant les techniques MEMS.
Des dispositifs miniatures parviennent à exhiber un comportement oscillatoire montrant
le potentiel d’intégration de cette technologie.Abstract : The tremendous technological progresses realized in the last decades allow us to swarm our environment with Wireless Sensors Networks. These WSNs combine the MEMS’ miniature size and low energy consumption, and the powerful Internet communication protocols. This Internet of Things shows great potential in many applications such as industry or housing. For a decade now, the Energy Harvesting community wants to build autonomous WSNs by enabling them to feed off energy wastes. In this work, we study the electricity generation capabilities of a Self-Oscillating Fluidic Heat Engine (SOFHE) and present its characteristic thermodynamic cycle. Our model shows that the SOFHE acts as a mechanical resonator excited by the successive evaporation and condensation processes underwent by the working fluid. These phase changes put a liquid mass in motion, coupled with a vapor spring. The coupling of our heat engine with an electromechanical transducer is studied and leads to a piezoelectric spiral conception and fabrication. Their association forms a thermo-electrical generator able to power and charge an electrical capacitor. Eventually, we demonstrate the miniaturization prospects and integration potential of this SOFHE technology. A micro-fabrication process enables a SOFHE MEMS implementation. Our process includes a deep glass wet etching step as well as a Au-Si eutectic wafer bonding.
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Aquino, Paul. "Piezoelectric flexing and output voltage of a microchannel heat engine." Thesis, 2010. http://hdl.handle.net/10155/117.
Повний текст джерелаАнотація:
In this thesis, a new model is formulated for a piezoelectric membrane and fluid motion in a microchannel heat engine. A new slug flow model is developed for droplet motion in a circular cross-section channel. The model includes friction, pressure, viscous and thermocapillary forces on the droplet. This thesis examines the concept of a piezoelectric device at one end of the channel to generate electricity from thermocapillary pumping of the droplet within the microchannel. The slug flow model is used to predict the flow energy needed to convert the thermocapillary pumping into electrical energy. A thin membrane design of a piezoelectric device is developed and modelled with the slug flow approximation. The deformation of the piezoelectric membrane is analyzed. The deformation is found to be a function of the air pressure in the closed microchannel and the displacement of the droplet along the microchannel. This was formulated based on the bending of a thin plate (representing the membrane). The displacement relates to the final output voltage of the design. The direct piezoelectric effect was also examined to determine a relationship between the output voltage and induced stress on the membrane by the force of air. Results are presented for a micro heat engine configuration containing a single membrane on one side of the droplet. It was found that the deformation of the membrane and the output voltage were directly proportional to the displacement of the droplet. A relatively small output voltage was gained from a complete cycle of
the droplet. A sensitivity study was performed by varying the channel dimensions along with the dimensions of the piezoelectric membrane. The coupling factor of the piezoelectric membrane was varied to examine its effect on the output voltage. It was found that a larger channel and thinner membrane resulted in a larger output voltage. Materials with a large piezoelectric constant were found to have the largest output voltage, as opposed to those with a lower dielectric constant.UOIT
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Green, Darren Vincent Santavicca Domenic A. Sharp Kendra V. "Development of a piezoelectric micro engine using pulsed catalytic combustion." 2008. http://etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-3644/index.html.
Повний текст джерела
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Nouraei, Hirmand. "Design and Development of a Direct-acting Piezoelectric Fuel Injector." Thesis, 2012. http://hdl.handle.net/1807/33480.
Повний текст джерелаАнотація:
Manufacturers face the challenge of enhancing fuel efficiency, engine performance, and reducing harmful emissions. Novel fuel injection technologies can assist in meeting such demands. This dissertation summarizes the stages in the design, prototyping and experimental analysis of a direct-acting piezoelectric fuel injector concept. In the proposed design, a piezoelectric stack actuator is used to directly control the injection of fuel in order to enhance the injection characteristics by utilizing the fast response time of the actuator. The direct-acting concept was implemented by developing a motion inverter in the form of a disc that reverses the direction of the input and allows the actuator to directly control injections. Tests with input signals similar to those used in diesel engines confirmed the theoretical calculations and verified the prototype’s performance. This design can control the quantity of injected fuel more precisely than currently available commercial injectors.
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Cheng, Penghui. "Macroscopic Properties of Hollow Cone Spray Using an Outwardly Opening Piezoelectric Injector in GCI Engine." Thesis, 2016. http://hdl.handle.net/10754/618810.
Повний текст джерелаАнотація:
Fuel mixture formation and spray characteristics are crucial for the advancement of Gasoline Compression Ignition (GCI) engine. For investigations of spray characteristics, a high-pressure high-temperature spray chamber with constant volume has been designed, tested and commissioned at CCRC, KAUST. Back light illumination technique has been applied to investigate the macroscopic spray properties of an outwardly opening piezoelec- tric injector. Three parameters including injection pressure, ambient pressure, and ambient temperature have been involved. A total of 18 combinations of experimental conditions were tested under non-reactive conditions.
Through qualitative analysis of spray morphology under different operating conditions, an apparent distinction of spray morphology has been noticed. Spray morphology and propagation have shown strong dependencies on ambient pressure and ambient tempera- ture while injection pressure has a negligible effect on spray shape. Increasingly compact and bushier spray patterns were observed in the cases of high ambient pressure due to in- creasing aerodynamic drag force on spray boundary. It should also be noted that ambient temperature plays a fairly important role in fuel evaporation rate. At 200 °C, oscillating and considerably short spray shape was produced. Also, circumferential ring-like vortices and distinctive string-like structures have been identified for the fuel spray exiting this hollow cone injector. It has been observed that high ambient pressure conditions (Pamb = 4 bar and
10.5 bar) are favorable to the vortices generation, which has also been reported in previous literature.
The quantitative description of macroscopic spray properties reveals that ambient pres- sure and ambient temperature are found to be the most influential parameters on liquid penetration length. The rise of ambient pressure results in considerably shorter liquid pen- etration length. Ambient temperature also appears to be a very effective factor of reducing penetration length. Injection pressure contributes to a notable increase of liquid penetra- tion length under ambient pressure of 1 atm. However, the influence of injection pressure is substantially reduced under ambient pressures of 4 bar and 10.5 bar, which indicates that ambient pressure exerts much stronger influence than injection pressure on liquid penetra- tion length.
Furthermore, it has been revealed that the increase of injection pressure and ambient pressure are the predominant sources contributing to the enlargement of spray cone angle. The effect of injection pressure on spray cone angle has been amplified by the increase of ambient pressure. With increasing ambient pressure, the penetration of injected fuel tends to propagate axially in a much slower manner that leads to wider fuel distribution in the radial direction. Ambient temperature exerts a similar influence on spray cone angle as on liquid penetration length. The spray cone angle experiences a noticeable decline when ambient gas is increased to 200 °C.
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Liu, Chia-Ming, and 劉家民. "Study on the Characteristics of Diesel/butanol/Biodiesel Blends in Reducing Pollution Emission Characteristics of Diesel Engine Generators by Normal Piezoelectric Technology." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/dj826a.
Повний текст джерелаАнотація:
碩士國立中山大學
環境工程研究所
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This study was configured with different proportions of diesel (Diesel, 50、60、70、80、90、100 vol%), butanol (Butanol, 10、20、30、40 vol%) and waste edible oil transesterified biodiesel (WCO-Biodiesel, 10 vol%). The mixed oil is used for the diesel engine combustion test, and the front air inlet uses the normal piezoelectric slurry equipment (voltages 0, 4-7 kV) to free the gas entering the engine combustion chamber (hydrogen radicals). The blending can effectively improve the combustion efficiency while achieving the goal of reducing the amount of air pollutants emitted by diesel engines. The results of this study show that the test is carried out in the state of no plasma equipment (0 V). The engine is operated at a maximum output of 6.6 kW at 3600 rpm/min, and is tested with different mixed oil. The output voltage is in the range of (4、5、6、7) kV. When the optimum operating conditions of the plasma equipment is 6 kV and mixed oil ratio (D70B20W10), the reduction rates of pollutants such as CO, NOx, PM10 and PM2.5 are about 24.4%, 23.9%, 22.8% and 22.4%; In aldehydes and ketones, the biggest proportions of formaldehyde, acetaldehyde and acrolein were 55.0%, 18.2% and 11.8%, and the reduction rates were about 13.2%, 13.2% and 13.6%. The brake unit fuel consumption rate was reduced by 9.4%; whereby the brake heat efficiency would be rise by 13.6%. The experimental results show that the diesel engine pollution emissions show a downward trend. It is estimated that when 30-40 % of butanol is added instead of 10-20 %, the calorific value is higher, and the combustion of the diesel engine is more complete and eventually decrease the amount of pollution discharged.
Книги з теми "Piezoelectric engine"
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Venugopal, Vijay. Smart materials and its applications [sic]: A feasability [sic] study of using piezoelectric devices in diesel engine applications. Saarbrücken: VDM Verlag Dr. Müller, 2008.
Знайти повний текст джерелаЧастини книг з теми "Piezoelectric engine"
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Perederko, Anatoly. "Correction of the Temperature Component of Error of Piezoelectric Acceleration Sensor." In Handbook of Research on Artificial Intelligence Applications in the Aviation and Aerospace Industries, 263–78. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-1415-3.ch011.
Повний текст джерелаАнотація:
In the aviation and aerospace industries, systems of artificial intelligence are being intensively implemented. For their effective functioning, it is necessary to provide reliable primary information. Information is collected by primary converters. In various systems of aviation technology, piezoelectric accelerometers are widely used as primary transducers. In particular, they are part of inertial navigation systems. These systems do not need external sources of information and are not affected by external interference. Therefore, they are widely used in aircraft for various purposes. These accelerometers are also used in other aircraft systems. In systems for monitoring the operation of gas turbine engines, systems for registering overloads. However, in conditions of high-temperature differences, shocks, vibrations, and significant accelerations, piezoelectric transducers have inherent flaws that affect the linearity and accuracy in measuring these values. Especially piezoelectric transducers are critical to extreme temperatures.
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M'boungui, Gasta, Abdul-Ganiyu Adisa Jimoh, Betty Semail, and Frederic Giraud. "Stateflow® Aided Modelling and Simulation of Friction in a Planar Piezoelectric Actuator." In MATLAB Applications for the Practical Engineer. InTech, 2014. http://dx.doi.org/10.5772/57569.
Повний текст джерелаТези доповідей конференцій з теми "Piezoelectric engine"
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Sumali, Hartono, and Harley Cudney. "An active engine mount with a piezoelectric stacked actuator." In 35th Structures, Structural Dynamics, and Materials Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1994. http://dx.doi.org/10.2514/6.1994-1466.
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Matveev, Konstantin I., Andy Wekin, Cecilia D. Richards, and Najmeddin Shafrei-Tehrany. "On the Coupling Between Standing-Wave Thermoacoustic Engine and Piezoelectric Transducer." In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-41119.
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Small thermoacoustic engines integrated with piezoelectric elements can be effective small-scale power sources to convert heat to electricity. A simplified mathematical model is developed to illustrate the effect of transducer parameters on the frequency and onset temperature difference in a standing-wave engine and to estimate efficiencies of energy conversion. Results of sample calculations show that efficiencies for the acoustic-electric energy conversion on the order of 10% are feasible.
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Wekin, A., C. Richards, K. Matveev, and M. Anderson. "Characterization of Piezoelectric Materials for Thermoacoustic Power Transduction." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-67725.
Повний текст джерелаАнотація:
In this work an experimental study of the performance of piezoelectric transducers for power production from a small-scale thermoacoustic engine is presented. Four piezoelectric samples are identified and characterized. These samples are tested on a variable acoustic driver and electrical power produced is measured. Finally, the samples are tested on four experimental thermoacoustic engines to verify the results from the acoustic setup. The maximum power produced is 177 μW from a closed thermoacoustic engine coupled to a 15mm PZT disk.
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Dempsey, Adam B., Patrick J. Seiler, and Simon Johnson. "Comparison of Cylinder Pressure Measurements on a Heavy-Duty Diesel Engine Using a Switching Adapter." In ASME 2018 Internal Combustion Engine Division Fall Technical Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/icef2018-9776.
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In this study, a variety of piezoelectric pressure transducer designs and mounting configurations were compared for measuring in-cylinder pressure on a heavy-duty single-cylinder diesel engine. A unique cylinder head design was used which allowed cylinder pressure to be measured simultaneously in two locations. In one location, various piezoelectric pressure transducers and mounting configurations were studied. In the other location, a Kistler water-cooled switching adapter with a piezoresistive pressure sensor was used. The switching adapter measured in-cylinder pressure during the low pressure portion of the cycle. During the high pressure portion of the cycle the sensor is protected from the high pressure and high temperature gases in the cylinder. Therefore, the piezoresistive sensor measured in-cylinder pressure highly accurately, without the impacts of short term thermal drift, otherwise known as thermal shock. Additionally, the piezoresistive sensor is an absolute pressure sensor which does not require a baseline or “pegging” on every engine cycle. With this measurement setup, the amount of thermal shock and induced measurement variability was accurately assessed for the piezoelectric sensors. Data analysis techniques for quantifying the accuracy of a piezoelectric cylinder pressure measurements are also presented and discussed. It was observed that all the piezoelectric transducers investigated yielded very similar results regarding compression pressure, start of combustion, peak cylinder pressure, and the overall heat release rate shape. Differences emerged when studying the impact of the transducer mounting (e.g., recessed vs. flush-mount). Recessed-mount transducers tended to yield a more accurate measurement of the cycle-to-cycle variability when compared to the baseline piezoresistive sensor. This is thought to be due to reduced levels of thermal shock, which can vary from cycle-to-cycle.
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Lin, J., C. Scalo, and L. Hesselink. "High-fidelity simulations of a standing-wave thermoacoustic-piezoelectric engine." In Third international workshop on thermoacoustics. Enschede: University of Twente, Faculty of Engineering Technology, Laboratory of Thermal Engineering, 2015. http://dx.doi.org/10.3990/2.280.
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Khameneifar, Farbod, Siamak Arzanpour, and Mehrdad Moallem. "Piezo-Actuated Active Decoupler Hydraulic Engine Mount." In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-39542.
Повний текст джерелаАнотація:
Hydraulic mounts are widely used in the automotive industry to isolate the engine and chassis from each other. For these passive economic vibration isolators the parameter values and characteristics are fixed. As a result, they cannot properly attenuate the complicated vibration transmitted from the engine. In this paper development of a new active mount using piezoelectric materials is described. The typical decoupler of the mount has been replaced by a set of piezoelectric actuators. The actuator consists of two piezoelectric bimorph cantilevers and the beams are covered by a thin rubber layer. The actuator moves upon receiving the signal from the controller, and it changes the dynamic performance of the mount accordingly. Mathematical modeling of the active mount is derived and the simulated results are presented for different voltage signals. Simulations demonstrate the performance of the designed active engine mount to deal with complicated vibration patterns.
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Ambur, Ramakrishnan, Xiaonan Zhao, and Stephan Rinderknecht. "Fault Diagnosis on an Aircraft Engine Model Equipped With Self-Sensing Piezoelectric Actuators." In ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/gt2016-56975.
Повний текст джерелаАнотація:
Piezoelectric actuators provide an active solution for vibration control in aircraft engines compared to the state-of-the-art squeeze film dampers. The property of piezoelectric materials enable them to be used as sensors and actuators simultaneously. This self-sensing property of the actuator is analyzed in this paper for its ability to detect unbalance faults, which are common in rotor systems. In this paper two different actuator configurations are studied for its ability to diagnose unbalance faults in an aircraft engine. Three parameters of unbalances such as its magnitude, its position in the circumferential and axial direction in a rotor are estimated through simulations. Finally a suitable position to achieve a better fault diagnosis is identified.
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Gordon, Robert, and Joseph Hollkamp. "An experimental investigation of piezoelectric coupling in jet engine fan blades." In 41st Structures, Structural Dynamics, and Materials Conference and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2000. http://dx.doi.org/10.2514/6.2000-1700.
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SONG, H. J., S. B. CHOI, Y. S. JEON, and N. M. WERELEY. "VIBRATION CONTROL OF ENGINE MOUNT USING ER FLUID AND PIEZOELECTRIC ACTUATOR." In Proceedings of the 10th International Conference on ERMR 2006. WORLD SCIENTIFIC, 2007. http://dx.doi.org/10.1142/9789812771209_0102.
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Kaloko, Bambang Sri, Widjonarko, and Zulfikar Febrian. "Application The Method Direct Effect Piezoelectric (DEP) Using Vibrator Engine Diesel." In 2021 International Conference on Computer Science, Information Technology, and Electrical Engineering (ICOMITEE). IEEE, 2021. http://dx.doi.org/10.1109/icomitee53461.2021.9650118.
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