Rozprawy doktorskie na temat „Piezoelectric”
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Yang, Xiaomei, i 楊笑梅. "Computational models for piezoelectrics and piezoelectric laminates". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2004. http://hub.hku.hk/bib/B31246217.
Pełny tekst źródłaFlynn, Anita M. "Piezoelectric Ultrasonic Micromotors". Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/7086.
Pełny tekst źródłaBruna, Magali. "Piezoelectric ceramic devices". Thesis, University of Cambridge, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.615866.
Pełny tekst źródłaLeinvuo, J. "Flextensional piezoelectric motors". Thesis, Cranfield University, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.409514.
Pełny tekst źródłaBoestad, Albin, i Fabian Rudberg. "Piezoelectric Guitar Tuner". Thesis, KTH, Mekatronik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-296320.
Pełny tekst źródłaI följande kandidatexamensarbete kontrueras en automatisk gitarrstämmare med hjälp av en piezosensor, en stegmotor och en Arduino-mikrokontroller. E4-strängen på en akustisk gitarr användes som substitut för hur stämningsproceduren skulle kunna fungera för vilken annan gitarrsträng som helst. Noggrannheten samt stämningshastigheten undersöktes genom experiment. Genomsnittet av frekvensskillnaderna mellan de piezo-kalibrerade avläsningsvärdena och E4-strängens värden definierade måttet på noggrannhet. Hastigheten på strängstämningen beräknades i form av hur många gånger en sträng behövdes slås an innan strängen var inom ett godkänt intervall. Den automatiska gitarrstämmaren visade sig pålitiligt kunna stämma E4-strängen på ett försök inom ett noggrannhetsintervall på ±2Hz från det teoretiska värdet. Stämmaren kunde stämma inom +3.4 cents och−5.1 cents samt var var i genomsnitt −3.4 cents i från det teoretiska värdet.
Barham, Oliver M. "Microfabricated Bulk Piezoelectric Transformers". Thesis, University of Maryland, College Park, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10615552.
Pełny tekst źródłaPiezoelectric voltage transformers (PTs) can be used to transform an input voltage into a different, required output voltage needed in electronic and electro- mechanical systems, among other varied uses. On the macro scale, they have been commercialized in electronics powering consumer laptop liquid crystal displays, and compete with an older, more prevalent technology, inductive electromagnetic volt- age transformers (EMTs). The present work investigates PTs on smaller size scales that are currently in the academic research sphere, with an eye towards applications including micro-robotics and other small-scale electronic and electromechanical sys- tems. PTs and EMTs are compared on the basis of power and energy density, with PTs trending towards higher values of power and energy density, comparatively, indicating their suitability for small-scale systems. Among PT topologies, bulk disc-type PTs, operating in their fundamental radial extension mode, and free-free beam PTs, operating in their fundamental length extensional mode, are good can- didates for microfabrication and are considered here. Analytical modeling based on the Extended Hamilton Method is used to predict device performance and integrate mechanical tethering as a boundary condition. This model differs from previous PT models in that the electric enthalpy is used to derive constituent equations of motion with Hamilton’s Method, and therefore this approach is also more generally applica- ble to other piezoelectric systems outside of the present work. Prototype devices are microfabricated using a two mask process consisting of traditional photolithography combined with micropowder blasting, and are tested with various output electri- cal loads. 4mm diameter tethered disc PTs on the order of .002cm
3 , two orders smaller than the bulk PT literature, had the followingperformance: a prototype with electrode area ratio (input area / output area) = 1 had peak gain of 2.3 (± 0.1), efficiency of 33 (± 0.1)% and output power density of 51.3 (± 4.0)W cm
-3 (for output power of80 (± 6)mW) at 1M? load, for an input voltage range of 3V-6V (± one standard deviation). The gain results are similar to those of several much larger bulk devices in the literature, but the efficiencies of the present devices are lower. Rectangular topology, free-free beam devices were also microfabricated across 3 or- ders of scale by volume, with the smallest device on the order of .00002cm
3 . These devices exhibited higher quality factorsand efficiencies, in some cases, compared to circular devices, but lower peak gain (by roughly 1/2 ). Limitations of the microfab- rication process are determined, and future work is proposed. Overall, the devices fabricated in the present work show promise for integration into small-scale engi- neered systems, but improvements can be made in efficiency, and potentially voltage gain, depending on the application
Zhu, Zangyuan. "Lead-free piezoelectric ceramics". Thesis, University of Leeds, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.581971.
Pełny tekst źródłaDe, Poumeyrol Benjamin. "Characterization of piezoelectric paint". Thesis, University of Newcastle Upon Tyne, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.273485.
Pełny tekst źródłaHack, Thorsten. "Stick-slip piezoelectric actuators". Thesis, University of Cambridge, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.624403.
Pełny tekst źródłaLai, Ming-Liang. "Developing piezoelectric biosensing methods". Thesis, University of Glasgow, 2015. http://theses.gla.ac.uk/6109/.
Pełny tekst źródłaBarthe, Peter Girard. "Analysis of tapered-thickness piezoelectric ceramics for ultrasonic transducers". Diss., Georgia Institute of Technology, 1991. http://hdl.handle.net/1853/15434.
Pełny tekst źródłaGiurgea, Constantin. "Precise motion with piezoelectric actuator". Thesis, University of Ottawa (Canada), 2002. http://hdl.handle.net/10393/6184.
Pełny tekst źródłaHaigh, Richard. "Novel piezoelectric thick film actuators". Thesis, Cranfield University, 2005. http://dspace.lib.cranfield.ac.uk/handle/1826/3814.
Pełny tekst źródłaKwon, Dongwon. "Piezoelectric kinetic energy-harvesting ics". Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/47571.
Pełny tekst źródłaBaker, Daniel William. "Lead-free piezoelectric niobate perovskites". Thesis, University of Warwick, 2010. http://wrap.warwick.ac.uk/3894/.
Pełny tekst źródłaWu, Zhengbin. "Bondlines in piezoelectric ultrasonic transducers". Thesis, University of the West of Scotland, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.427721.
Pełny tekst źródłaWright, Darryn John. "New piezoelectric and pyroelectric polymers". Thesis, University of Leeds, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.437100.
Pełny tekst źródłaSanson, Alessandra. "Modified bismuth titanate piezoelectric ceramics". Thesis, Cranfield University, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.401625.
Pełny tekst źródłaRayner, Philip. "Piezoelectric ultrasonic motors and micromotors". Thesis, Cranfield University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.323890.
Pełny tekst źródłaPathak, Shrey. "Piezoelectric microsensors for semiochemical communication". Thesis, University of Warwick, 2012. http://wrap.warwick.ac.uk/57210/.
Pełny tekst źródłaPantzare, Sandra, i Elin Wollert. "Wireless Piezoelectric Horse Sensor System". Thesis, Linköpings universitet, Fysik och elektroteknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-150152.
Pełny tekst źródłaEly, Kevin Jon. "Piezoelectric effects in GaAs MESFET's". Diss., Virginia Tech, 1993. http://hdl.handle.net/10919/40029.
Pełny tekst źródłaPh. D.
Bazilo, C. V., V. M. Zaika, Yu Yu Bondarenko, Yu A. Petrushko i L. O. Fedoruk. "Piezoelectric Transducers for Ultrasonic Surgery". Thesis, Sumy State University, 2017. http://essuir.sumdu.edu.ua/handle/123456789/65125.
Pełny tekst źródłaAnton, Steven Robert. "Multifunctional Piezoelectric Energy Harvesting Concepts". Diss., Virginia Tech, 2011. http://hdl.handle.net/10919/27388.
Pełny tekst źródłaThe concept of multifunctional piezoelectric self-charging structures is explored throughout this work. The operational principle behind the concept is first described in which piezoelectric layers are directly bonded to thin-film battery layers resulting in a single device capable of simultaneously harvesting and storing electrical energy when excited mechanically. Additionally, it is proposed that self-charging structures be embedded into host structures such that they support structural load during operation. An electromechanical assumed modes model used to predict the coupled electrical and mechanical response of a cantilever self-charging structure subjected to harmonic base excitation is described. Experimental evaluation of a prototype self-charging structure is then performed in order to validate the electromechanical model and to confirm the ability of the device to operate in a self-charging manner. Detailed strength testing is also performed on the prototype device in order to assess its strength properties. Static three-point bend testing as well as dynamic harmonic base excitation testing is performed such that the static bending strength and dynamic strength under vibration excitation is assessed. Three-point bend testing is also performed on a variety of common piezoelectric materials and results of the testing provide a basis for the design of self-charging structures for various applications.
Multifunctional vibration energy harvesting in unmanned aerial vehicles (UAVs) is also investigated as a case study in this dissertation. A flight endurance model recently developed in the literature is applied to model the effects of adding piezoelectric energy harvesting to an electric UAV. A remote control foam glider aircraft is chosen as the test platform for this work and the formulation is used to predict the effects of integrating self-charging structures into the wing spar of the aircraft. An electromechanical model based on the assumed modes method is then developed to predict the electrical and mechanical behavior of a UAV wing spar with embedded piezoelectric and thin-film battery layers. Experimental testing is performed on a representative aluminum wing spar with embedded self-charging structures in order to validate the electromechanical model. Finally, fabrication of a realistic fiberglass wing spar with integrated piezoelectric and thin-film battery layers is described. Experimental testing is performed in the laboratory to evaluate the energy harvesting ability of the spar and to confirm its self-charging operation. Flight testing is also performed where the fiberglass spar is used in the remote control aircraft test platform and the energy harvesting performance of the device is measured during flight.
Ph. D.
Morvan, Jason. "HIGHLY PIEZOELECTRIC SOFT COMPOSITE FIBERS". Kent State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=kent1334585220.
Pełny tekst źródłaXiong, Haocheng. "Piezoelectric Energy Harvesting for Roadways". Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/51361.
Pełny tekst źródłaPh. D.
Zhang, Jin. "Mechanical behaviours of piezoelectric nanostructures". Thesis, Swansea University, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.678635.
Pełny tekst źródłaCapobianco, Joseph A. Shih Wan Y. Shih Wei-Heng. "Piezoelectric microcantilever serum protein detector /". Philadelphia, Pa. : Drexel University, 2009. http://hdl.handle.net/1860/2993.
Pełny tekst źródłaSullivan, Timothy Michael. "Development of a novel method for measuring the transverse piezoelectric coefficients of thin piezoelectric films". Online access for everyone, 2004. http://www.dissertations.wsu.edu/Thesis/Summer2004/t%5Fsullivan%5F072604.pdf.
Pełny tekst źródłaBing, Yonghong. "Synthesis, structure and properties of high piezo-and ferroelectric complex perovskite systems /". Burnaby B.C. : Simon Fraser University, 2005. http://ir.lib.sfu.ca/handle/1892/2032.
Pełny tekst źródłaMtawa, Alexander Nikwanduka. "Influence of geometry and material properties on the optimum performance of the C-shape piezo-composite actuator". Thesis, Cape Peninsula University of Technology, 2008. http://hdl.handle.net/20.500.11838/1301.
Pełny tekst źródłaIn recent years, due to rapid advances in technology there has been an increasingly high demand for large displacement and large force, precise positioning, fast response, low power consuming miniature piezoelectric actuators. In certain smart structure applications, the use of curved piezoelectric actuators is necessary. The present work extends the earlier investigations on the C- shape actuator by providing a detailed investigation on the influence of geometric and material properties of the individual layers of the C-shape piezocomposite for its optimal performance as an actuator. Analytical models have. been used to optimize the geometry of the actuator. Experimental and finite element analyses (using general purpose finite element software i.e. CoventerWare and MSC. Marc) have been used for validation. The present work has established that, by maintaining the thickness of the substrate and piezoceramic layers constant; changing the external radius, for example increasing it, the stiffness of the structure decreases and thus yielding large displacement This has a negative effect on the force produced by the actuator. With fixed thickness of the substrate and varying the thickness of the piezoceramic (for fixed external radius) the result is as follows: Increasing the thickness of the piezoceramic layer has the effect of decreasing the displacement while the force increases. With fixed PZT thickness as well as the external radius, varying the substrate thickness has the following effect: As the thickness of the substrate increases the displacement increases reaching a maximum. Subsequent increase in the thickness of the substrate the displacement is reduced. The force continues increasing at least for the ratios up to 1.0, further increase of the substrate, subsequent decrease of force is also noted. In addition to changing the thickness of the substrate, the choice of different material for the substrate has the following effect: For substrate/PZT ratios of up to 0.6. an actuator with substrate material having higher elastic modulus will produce larger displacement while for ratios beyond this ratio the situation is reversed. The causes for this kind of behaviour have been addressed. In all cases both force and displacement are found to be directly proportional to applied voltage.
Shen, Zuyan Shih Wan Y. Shih Wei-Heng. "Synthesis, fabrication, and characterization of self-exciting, self-sensing PZT/SiO2 piezoelectric micro-cantilever sensors /". Philadelphia, Pa. : Drexel University, 2006. http://hdl.handle.net/1860/1227.
Pełny tekst źródłaStoll, William Allard III. "Nonlinear constitutive behavior of PZT". Thesis, Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/17117.
Pełny tekst źródłaMika, Bartosz. "Design and testing of piezoelectric sensors". [College Station, Tex. : Texas A&M University, 2007. http://hdl.handle.net/1969.1/ETD-TAMU-1565.
Pełny tekst źródłaGomis-Bellmunt, Oriol. "Identification and control of piezoelectric actuators". Saarbrücken VDM Verlag Dr. Müller, 2007. http://d-nb.info/988454696/04.
Pełny tekst źródłaDickens, Robert A. "Optimization of a piezoelectric acoustical compressor". College Park, Md. : University of Maryland, 2004. http://hdl.handle.net/1903/181.
Pełny tekst źródłaThesis research directed by: Dept. of Mechanical Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
Wang, Weijian. "Electrode shape optimization of piezoelectric transducers". [Gainesville, Fla.] : University of Florida, 2003. http://purl.fcla.edu/fcla/etd/UFE0001041.
Pełny tekst źródłaLin, Ting-Kuang, i 林廷光. "Research of Dielectrics and Piezoelectrics in Piezoelectric Ceramics". Thesis, 1998. http://ndltd.ncl.edu.tw/handle/97778568764655146235.
Pełny tekst źródłaShivashankar, P. "Analytical Modelling and Non-linear Characterisation of Piezoelectric Materials for Actuation and Vibration Control of Beams". Thesis, 2017. http://etd.iisc.ac.in/handle/2005/4011.
Pełny tekst źródłaShivashankar, P. "Analytical Modelling and Non-linear Characterisation of Piezoelectric Materials for Actuation and Vibration Control of Beams". Thesis, 2017. http://etd.iisc.ernet.in/2005/3990.
Pełny tekst źródłaChien-Cheng, Chen. "A Thermo-piezoelectric Finite-element Solver for Piezoelectric Transformers". 2006. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-1807200613280900.
Pełny tekst źródłaHuang, I.-Ren, i 黃以仁. "Piezoelectric Properties of Cement Piezoelectric Composites with Reactive Powders". Thesis, 2015. http://ndltd.ncl.edu.tw/handle/737gbm.
Pełny tekst źródła國立高雄應用科技大學
土木工程與防災科技研究所
103
0-3 cement-based piezoelectric composite (PP material) consisting of PZT as the inclusion and cement as the binder, with 50% by volume each. While 11.1% and 11.4% of cement were replaced, respectively, by quartz flour and silica fume, the composite is called reactive powders cement piezoelectric composites (PR material). To investigate the effect of silica-based materials, six admixtures: slag, fly ash, glass powder, diatomaceous earth, silicon and silicon carbide were added to PR material to examine its piezoelectric properties. The admixture was a replacement of partial silica fume in PR material. The content of admixture for slag and fly ash is 10% to 50%, and the others are 2% to 10%. Specimens were fabricated by 80MPa compression and cured at 90℃ for 24h. After that, specimens were put in 150℃ silicon oil bath by applying 1.5kV/mm electric field for 40 min to obtain piezoelectric properties. Experimental results indicate that PR materials with no water during the process of manufacturing always have the optimum piezoelectric strain constant d33 and dielectric constant r, compared with that adding water. This is because water will provide more voids inside the specimen that affects the propagation of applied stress inducing lower piezoelectric properties. From the observations of optical microscope, adding quartz flour and silica fume to PP material can reduce the content of voids. However, void content of PR materials increases with increasing slag and fly ash. Before the polarization, the capacity C and dielectric loss of PR materials increase with increasing admixtures, and this leads to extend trigger time during the polarization. The age for saturated values of piezoelectric properties of PR material is about 30 days, and that is early than for PP material with 50 days. PR materials with 2% glass powder (PG-2) always the highest value of d33 and r, where d33=124.4pC/N and r =593. The resonance frequency of PP materials is 105.025 kHz ~ 125.126 kHz and that is lower than the PP material.
Chen, Chien-Cheng, i 陳建誠. "A Thermo-piezoelectric Finite-element Solver for Piezoelectric Transformers". Thesis, 2006. http://ndltd.ncl.edu.tw/handle/05047937446431794167.
Pełny tekst źródła國立臺灣大學
機械工程學研究所
94
In this work, we develop a 3-D FEM solver, NTUPZE-T for analyzing piezoelectric transformers. This solver is capable of estimating the device thermal effects. In order to estimate the device temperature distribution when the device operates, we calculate the dissipation of energy based on the internal damping effects. The dissipated energy is considered as the heat source of the heat transfer equation for calculating the temperature distribution of a device. Material constants of piezoelectric materials are usually dependent on temperature. Therefore, a self-consistent thermo-piezoelectric analysis procedure is proposed. In this work, we employ the relaxation algorithm for self-consistently computing the solutions in the piezoelectric domain and the thermal domain. Then the voltage gains, phase difference, efficiencies, as well as the temperature distribution of the device at difference frequencies and loadings can be obtained by the solver. The solver employs 20-node brick-element formulation for the discretization. We analyzed Rosen -modal-type piezoelectric transformer. The simulated results of voltage gains, efficiencies, resonant frequencies, and temperature increase of the device were also verified with the measured results.
Tseng, Wen-Tse, i 曾文澤. "Studies on Piezoelectric Properties of Porous Piezoelectric Ceramic╱Polymer Composites". Thesis, 1995. http://ndltd.ncl.edu.tw/handle/92029441850716683061.
Pełny tekst źródła國立成功大學
電機工程研究所
83
In the underwater sonar system, traditional lead zirconate titanate (PZT) piezoelectric ceramics have been widely used as all kinds of electro-acostical transducers due to their excellent piezoelectricity. However, when PZT ceramics applied in the underwater pressure sensor and hydrophone fields,they become low efficient because their sensitivity will reduce due to the high dielectric constants. In order to improve the efficiency, the composite and porous technology have been developed and applied on electro-acostical transducers gradually. This article uses the method of composing the porous PZT ceramic and polymer and hopes to reduce their dielectric constants to increase their sensitivity. Besides, we will study the changes of piezoelectricity of different polymer composites to get a better piezoelectric composite material for the underwater applications.
SU, I.-HSUAN, i 蘇逸軒. "Piezoelectric and Electromechanical Properties of Piezoelectric Cement with Quartz Powder". Thesis, 2017. http://ndltd.ncl.edu.tw/handle/2n69rc.
Pełny tekst źródła國立高雄應用科技大學
土木工程與防災科技研究所
105
Piezoelectric Cement (Cement Piezoelectric Composites) is a new type of sensor that can be used as the health detection and diagnosis of RC structures. The piezoelectric constants of piezoelectric cement are closely related to their electromechanical properties. Constant piezoelectric cement by the load will have a higher output voltage, in order to create a higher piezoelectric constant piezoelectric cement, the study added the right amount of quartz powder to form a new type of sensor for the quartz powder piezoelectric cement The In this study, the PZT ceramic content of piezoelectric cement is 30 ~ 70%, and the volume of quartz powder is 1%, 2%, 3%, 4%, 5% and 6%. Temperature treatment variables are AA = 23℃-23℃, AB = 23℃-140℃, BA = 140℃-23℃, BB = 140℃-140℃ four. To 100N, 200N, 300N load and 1Hz, 2Hz, 4Hz frequency load, the measurement of quartz powder piezoelectric cement output voltage. The results show that quartz powder PZT fixed 50% content, mixed with quartz powder content from 1% to 6%, of which 4% quartz powder piezoelectric cement piezoelectric properties of the best = 96.55pC / N, = 859.64, 4% quartz powder piezoelectric cement = 17.12%, the amount of mixed with quartz powder to enhance the piezoelectric properties. The piezoelectric cement is between 19.14 and 103.45 pC / N, BB is between 61.70 and 137.46 pC / N, and the quartz powder piezoelectric cement AA is between 44.14 and 96.55 pC / N, and BB were between 92.45 and 148.44 pC / N, indicating that the temperature of the sample could increase the piezoelectric strain constant. The electromechanical coupling constant of piezoelectric cement is between 10.11% and 19.00%, and the quartz powder piezoelectric cement is between 12.99% and 17.12%, but the electromechanical coupling constant after temperature treatment has some slight decrease. Force test results, 50% of the piezoelectric cement in the load of 300N obtained by the best output voltage of 850mV, quartz powder piezoelectric cement mixed with 4% content of the piezoelectric strain constant is best = 148.44 pC / N, the 300N output voltage Is 1121mV, showing that the higher the piezoelectric strain constant of the quartz powder is given, the higher the output voltage is.
Yeh, Yu-Chung, i 葉俞均. "Piezoelectric Ceramics Transformer". Thesis, 2004. http://ndltd.ncl.edu.tw/handle/21807343980157655421.
Pełny tekst źródła國立中央大學
光電科學研究所
92
Along with the invention of piezoelectric ceramic, there were many other small-sized but highly efficiency- transformed devices being researched and developed since then. In order to reduce the volume of power supplies and raise its efficiency simultaneously, researchers use piezoelectric transformers made by piezoelectric ceramic to serve their purpose. This thesis focuses in the piezoelectricity of piezoelectric ceramic, how to motivate a piezoelectric transformer, and how to use piezoelectric transformers to drive the backlight source.
Lin, Chih-Ting, i 林致廷. "Redeployment of Piezoelectric Point Sensor by Using Distributed Piezoelectric Sensor Technology". Thesis, 1998. http://ndltd.ncl.edu.tw/handle/01602834485433449821.
Pełny tekst źródła國立臺灣大學
應用力學研究所
86
Point sensors and distributed sensors have both been developed for several decades. The advantages of point sensors as compared to distributed sensors are quite different and both have their own limitations. Based on the linear piezoelectric sensor theory, piezoelectric point sensors and piezoelectric distributed sensors have been developed. A sensor model has been investigated and established. The experimental result to verify the unique characteristics of the piezoelectric sensor as well as the distributed point sensor. Based on the integrated distributed and point sensor, an innovative distributed accelerometer has been developed. The design principle as well as application implications of this newly developed accelerometer are detailed.
YOUNG, SHIN WEN, i 楊實文. "Piezoelectric Inkjet Head- Design and Fabrication of Micro Array Piezoelectric Actuator". Thesis, 2003. http://ndltd.ncl.edu.tw/handle/14146311682979223353.
Pełny tekst źródła大葉大學
機械工程學系碩士班
91
With the development of inkjet printing application technology, the inkjet print-head is not only occupying the traditional office printing market, but also making us to focus on it’s application, such as new organic/polymer lighting emitting display, optical communication devices, and MEMS devices, and engine technology etc. In many kinds of inkjet printing technology, the most favor type of inkjet printing technology is the piezoelectric driven printing technology. This study uses finite elements code, ANSYS, to analyze and design an actuator of a new type of shear mode piezoelectric ink jet head. Base on the actuated displacement and stoke volume change, the newly designed actuator model was optimized. The advantage of the model is use the most developed technology of making piezoelectric bulk. The piezoelectric actuator is poled by surface poling process, and owned different poling direction in the same piezoelectric material. Using electroplate process to fabricate a vibration membrane. Bonding both by epoxy and cutting the modulus by dicing saw. Measure the modulus properties such as displacement and compare with numerical simulation.
Hung, Sheng-Wei, i 洪聖瑋. "Synchronized Switch Harvesting Using Piezoelectric Oscillators for Piezoelectric Energy Harvesting System". Thesis, 2019. http://ndltd.ncl.edu.tw/handle/u794m8.
Pełny tekst źródła國立臺灣大學
工程科學及海洋工程學研究所
107
In order to replace the traditional battery, the concept of energy harvesting has been proposed and attracted widespread attention. Using the micro-piezoelectric transducer for extracting ambient energy is now a popular research topic. The piezoelectric energy harvesting system consists of a piezoelectric transducer, a load device, and interface circuits, which usually includes a rectifier and a DC/DC converter. In general, a full-bridge rectifier is used to convert AC source into DC voltage because it is easy to implement. However, the it has low power efficiency since its low power factor and forward voltage of the diodes consume large amounts of energy. As a result, more and more rectifiers with nonlinear synchronous switch harvesting techniques are proposed to improve the efficiency. Majority of which use inductors extract more energy by realizing voltage inversion and load independent; however, the inductor which is magnetic a component would generate electromagnetic waves and induce the electromagnetic interference. Therefore, this thesis proposes a new architecture-Synchronized Switch Harvesting using Piezoelectric Oscillators (SSHO) for solving these problem. Without bulky external inductors SSHO achieves voltage inversion which increases the voltage amplitude and then the output power. In this thesis, the SSHO rectifier fabricated in TSMC 0.25 μm HV-CMOS process has executed and tape-out. According to the post-layout simulation results, the circuit can boost the output power up to 475% when the equivalent current source of the piezoelectric source is 25 μA, the parasitic capacitance is 15 nF, and the vibration frequency is 125 Hz.
Patterson, Eric Andrew. "Development, characterization, and piezoelectric fatigue behavior of lead-free perovskite piezoelectric ceramics". Thesis, 2012. http://hdl.handle.net/1957/34828.
Pełny tekst źródłaGraduation date: 2013