Download or read book High Power Piezoelectrics and Loss Mechanisms written by Kenji Uchino and published by CRC Press. This book was released on 2020-09-09 with total page 351 pages. Available in PDF, EPUB and Kindle. Book excerpt: As one of the pioneers of "Piezoelectric Actuators", I have contributed to the commercialization of various products for over 45 years, including million-selling devices, micro-ultrasonic motors for smart-phone camera modules by Samsung Electromechanics, piezoelectric transformers for backlight inverters by Apple laptops, multilayer PZT actuators for diesel injection valves by Denso Corporation, and piezoelectric energy harvesting modules for Programable Air-Burst Munition by the US Army. During the development period for "piezoelectric actuators and transformers," I found that the bottleneck for device miniaturization was heat generation under a high-power drive condition. Thus, in parallel to the piezo-actuator developments, I have been developing various high-power density piezo-ceramic materials with the loss mechanism clarification. Hence, I considered that it was time to organize a textbook based on the previous studies, including my materials development philosophy to stimulate younger generations to reach to the energy density of up to 100 W/cm3 in the future. Increasing efficiency and saving energy and space (compactness) are one of the important approaches in this 21st-century "sustainable society." High-Power Piezoelectrics and Loss Mechanisims introduces the theoretical background of piezoelectrics, electromechanical phenomenology, loss mechanisms, practical materials, device designs, drive and characterization techniques, and typical applications, and looks forward to the future perspectives in this field. This book is NOT an overall review of this area, but it focuses on important and basic ideas under my development philosophy to understand how to design and develop high-power piezoelectric materials and devices. This textbook is designed for self-learning by the reader aided by the availability of: • Chapter Essentials – Summary for quick memory recovery • Check Points – Answers are provided in the Appendix • Example Problems – To enhance the reader’s understanding with full, detailed solutions • Chapter Problems – For the final exam or further consideration
Download or read book High Power Piezoelectrics and Loss Mechanisms written by Kenji Uchino and published by CRC Press. This book was released on 2020-09-09 with total page 381 pages. Available in PDF, EPUB and Kindle. Book excerpt: As one of the pioneers of "Piezoelectric Actuators", I have contributed to the commercialization of various products for over 45 years, including million-selling devices, micro-ultrasonic motors for smart-phone camera modules by Samsung Electromechanics, piezoelectric transformers for backlight inverters by Apple laptops, multilayer PZT actuators for diesel injection valves by Denso Corporation, and piezoelectric energy harvesting modules for Programable Air-Burst Munition by the US Army. During the development period for "piezoelectric actuators and transformers," I found that the bottleneck for device miniaturization was heat generation under a high-power drive condition. Thus, in parallel to the piezo-actuator developments, I have been developing various high-power density piezo-ceramic materials with the loss mechanism clarification. Hence, I considered that it was time to organize a textbook based on the previous studies, including my materials development philosophy to stimulate younger generations to reach to the energy density of up to 100 W/cm3 in the future. Increasing efficiency and saving energy and space (compactness) are one of the important approaches in this 21st-century "sustainable society." High-Power Piezoelectrics and Loss Mechanisims introduces the theoretical background of piezoelectrics, electromechanical phenomenology, loss mechanisms, practical materials, device designs, drive and characterization techniques, and typical applications, and looks forward to the future perspectives in this field. This book is NOT an overall review of this area, but it focuses on important and basic ideas under my development philosophy to understand how to design and develop high-power piezoelectric materials and devices. This textbook is designed for self-learning by the reader aided by the availability of: • Chapter Essentials – Summary for quick memory recovery • Check Points – Answers are provided in the Appendix • Example Problems – To enhance the reader’s understanding with full, detailed solutions • Chapter Problems – For the final exam or further consideration
Download or read book Advanced Piezoelectric Materials written by Kenji Uchino and published by Woodhead Publishing. This book was released on 2017-06-20 with total page 850 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advanced Piezoelectric Materials: Science and Technology, Second Edition, provides revised, expanded, and updated content suitable for those researching piezoelectric materials or using them to develop new devices in areas such as microelectronics, optical, sound, structural, and biomedical engineering. Three new chapters cover multilayer technologies with base-metal internal electrodes, templated grain growth preparation techniques for manufacturing piezoelectric single crystals, and piezoelectric MEMS technologies. Chapters from the first edition have been revised in order to provide up-to-date, comprehensive coverage of developments in the field. Part One covers the structure and properties of a range of piezoelectric materials. Part Two details advanced manufacturing processes for particular materials and device types, including three new chapters. Finally, Part Three covers materials development for three key applications of piezoelectric materials. Dr. Kenji Uchino is a pioneer in piezoelectric actuators, Professor of Electrical Engineering at Penn State University, and Director of the International Center for Actuators and Transducers. He has authored 550 papers, 54 books and 26 patents in the ceramic actuator area. - Features an overview of manufacturing methods for a wide range of piezoelectric materials - Provides revised, expanded, and updated coverage compared to the first edition, including three new chapters - Suitable for those researching piezoelectric materials or using them to develop new devices in areas such as microelectronics, optical, sound, structural, and biomedical engineering
Download or read book MicroMechatronics written by Kenji Uchino and published by CRC Press. This book was released on 2003-04-25 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt: This reference reveals the most significant technologies, procedures, and trends in the design and application of actuator devices for micromechatronic systems. It addresses critical design and manufacturing concepts, as well as challenges in the modeling and regulation of electromechanical losses and heat generation in actuator devices. Accompanied by a CD-ROM demonstrating examples of finite-element modeling and previously developed and commercially available actuators, Micromechatronics provides insight into the future of this evolving field, and considers recent developments in micropositioning technology and displacement transducer, motor, and ultrasonic motor applications.
Download or read book Handbook of Advanced Dielectric Piezoelectric and Ferroelectric Materials written by Z-G Ye and published by Elsevier. This book was released on 2008-03-20 with total page 1091 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive book covers recent developments in advanced dielectric, piezoelectric and ferroelectric materials. Dielectric materials such as ceramics are used to manufacture microelectronic devices. Piezoelectric components have been used for many years in radioelectrics, time-keeping and, more recently, in microprocessor-based devices. Ferroelectric materials are widely used in various devices such as piezoelectric/electrostrictive transducers and actuators, pyroelectric infrared detectors, optical integrated circuits, optical data storage and display devices.The book is divided into eight parts under the general headings: High strain high performance piezo- and ferroelectric single crystals; Electric field-induced effects and domain engineering; Morphotropic phase boundary related phenomena; High power piezoelectric and microwave dielectric materials; Nanoscale piezo- and ferroelectrics; Piezo- and ferroelectric films; Novel processing and new materials; Novel properties of ferroelectrics and related materials. Each chapter looks at key recent research on these materials, their properties and potential applications.Advanced dielectric, piezoelectric and ferroelectric materials is an important reference tool for all those working in the area of electrical and electronic materials in general and dielectrics, piezoelectrics and ferroelectrics in particular. - Covers the latest developments in advanced dielectric, piezoelectric and ferroelectric materials - Includes topics such as high strain high performance piezo and ferroelectric single crystals - Discusses novel processing and new materials, and novel properties of ferroelectrics and related materials
Download or read book Frontiers of Ferroelectricity written by Sidney B. Lang and published by Springer Science & Business Media. This book was released on 2007-12-31 with total page 275 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents theory, fundamentals and applications of ferroelectricy. 24 chapters gather reviews and research reports covering the spectrum of ferroelectricity. It describes the current levels of understanding of various aspects of ferroelectricity as presented by authorities in the field. Topics include relaxors, piezoelectrics, microscale and nanoscale studies, polymers and composites, unusual properties, and techniques and devices. The book is intended for physicists, engineers and materials scientists working with ferroelectric materials.
Download or read book Piezoelectric Energy Harvesting written by Alper Erturk and published by John Wiley & Sons. This book was released on 2011-04-04 with total page 377 pages. Available in PDF, EPUB and Kindle. Book excerpt: The transformation of vibrations into electric energy through the use of piezoelectric devices is an exciting and rapidly developing area of research with a widening range of applications constantly materialising. With Piezoelectric Energy Harvesting, world-leading researchers provide a timely and comprehensive coverage of the electromechanical modelling and applications of piezoelectric energy harvesters. They present principal modelling approaches, synthesizing fundamental material related to mechanical, aerospace, civil, electrical and materials engineering disciplines for vibration-based energy harvesting using piezoelectric transduction. Piezoelectric Energy Harvesting provides the first comprehensive treatment of distributed-parameter electromechanical modelling for piezoelectric energy harvesting with extensive case studies including experimental validations, and is the first book to address modelling of various forms of excitation in piezoelectric energy harvesting, ranging from airflow excitation to moving loads, thus ensuring its relevance to engineers in fields as disparate as aerospace engineering and civil engineering. Coverage includes: Analytical and approximate analytical distributed-parameter electromechanical models with illustrative theoretical case studies as well as extensive experimental validations Several problems of piezoelectric energy harvesting ranging from simple harmonic excitation to random vibrations Details of introducing and modelling piezoelectric coupling for various problems Modelling and exploiting nonlinear dynamics for performance enhancement, supported with experimental verifications Applications ranging from moving load excitation of slender bridges to airflow excitation of aeroelastic sections A review of standard nonlinear energy harvesting circuits with modelling aspects.
Download or read book Applications of ATILA FEM software to smart materials written by K. Uchino and published by Elsevier Inc. Chapters. This book was released on 2012-11-27 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt: Finite element analysis can be applied to smart structures with piezoelectric or magnetostrictive materials rather successfully when neither the applying electric field nor the generating AC strain is very large and when the linear relation can be supposed in the strain vs electric field or the strain vs stress. However, further improvement in the FEM algorithm is required for high field or high power drive of the piezoelectric system, where nonlinear and hysteretic characteristics should be taken into account, as well as heat generation. In this chapter, we will discuss the high power issues. There are three hysteresis loss components for piezoelectric vibrators, i.e., dielectric, elastic and piezoelectric losses. Mechanical quality factors play a significant role in the loss study of piezoelectrics, and they are basically related to all dielectric, elastic and piezoelectric loss factors. Besides, a higher quality factor at the antiresonance is usually observed in the PZT based experiments, in comparison with that at the resonance. ATILA is the unique software for adopting dielectric, elastic and piezoelectric losses separately to calculate the impedance/admittance curve.
Download or read book Applications of ATILA FEM Software to Smart Materials written by Kenji Uchino and published by Elsevier. This book was released on 2012-11-27 with total page 411 pages. Available in PDF, EPUB and Kindle. Book excerpt: ATILA Finite Element Method (FEM) software facilitates the modelling and analysis of applications using piezoelectric, magnetostrictor and shape memory materials. It allows entire designs to be constructed, refined and optimized before production begins. Through a range of instructive case studies, Applications of ATILA FEM software to smart materials provides an indispensable guide to the use of this software in the design of effective products.Part one provides an introduction to ATILA FEM software, beginning with an overview of the software code. New capabilities and loss integration are discussed, before part two goes on to present case studies of finite element modelling using ATILA. The use of ATILA in finite element analysis, piezoelectric polarization, time domain analysis of piezoelectric devices and the design of ultrasonic motors is considered, before piezo-composite and photonic crystal applications are reviewed. The behaviour of piezoelectric single crystals for sonar and thermal analysis in piezoelectric and magnetostrictive materials is also discussed, before a final reflection on the use of ATILA in modelling the damping of piezoelectric structures and the behaviour of single crystal devices.With its distinguished editors and international team of expert contributors, Applications of ATILA FEM software to smart materials is a key reference work for all those involved in the research, design, development and application of smart materials, including electrical and mechanical engineers, academics and scientists working in piezoelectrics, magenetostrictors and shape memory materials. - Provides an indispensable guide to the use of ATILA FEM software in the design of effective products - Discusses new capabilities and loss integration of the software code, before presenting case studies of finite element modelling using ATILA - Discusses the behaviour of piezoelectric single crystals for sonar and thermal analysis in piezoelectric and magnetostrictive materials, before a reflection on the use of ATILA in modelling the damping of piezoelectric structures
Download or read book Applied Mathematics in Ferroelectricity and Piezoelectricity written by Kenji Uchino and published by MDPI. This book was released on 2023-12-29 with total page 632 pages. Available in PDF, EPUB and Kindle. Book excerpt: This textbook “Applied Mathematics in Ferroelectricity and Piezoelectricity” was authored to provide the reader solid mathematical background for studying “ferroelectricity and piezoelectricity”, as a supplemental reference to my three course books; “Ferroelectric Devices 2nd Edition (2010)”, “Micromechatronics 2nd Edition (2019)”, and “FEM and Micromechatronics with ATILA Software (2008)”, all published from CRC Press. “Physics” prefers “simplicity”; converting a complicated phenomenon expressed by a function.
Download or read book Power Ultrasonics written by Juan A. Gallego-Juarez and published by Woodhead Publishing. This book was released on 2023-04-06 with total page 948 pages. Available in PDF, EPUB and Kindle. Book excerpt: Power Ultrasonics: Applications of High-Intensity Ultrasound, Second Edition provides a comprehensive reference on the fundamentals, processing, engineering, medical, food and pharmaceutical applications of ultrasonic processing. Chapters cover the fundamentals of nonlinear propagation of ultrasonic waves in fluids and solids, discuss the materials and designs of power ultrasonic transducers and devices, identify applications of high power ultrasound in materials engineering and mechanical engineering, food processing technology, environmental monitoring and remediation and industrial and chemical processing (including pharmaceuticals), medicine and biotechnology, and cover developments in ultrasound therapy and surgery applications.The new edition also includes recent advances in modeling, characterization and measurement techniques, along with additive manufacturing and micromanufacturing. This is an invaluable reference for graduate students and researchers working in the disciplines of materials science and engineering. In addition, those working on the physics of acoustics, sound and ultrasound, sonochemistry, acoustic engineering and industrial process technology, R&D managers, production, and biomedical engineers will find it useful to their work. - Covers the fundamentals of nonlinear propagation of ultrasonic waves in fluids and solids - Discusses the materials and designs of power ultrasonic transducers and devices - Considers state-of-the-art power sonic applications across a wide range of industries
Download or read book FEM and Micromechatronics with ATILA Software written by Kenji Uchino and published by CRC Press. This book was released on 2018-10-03 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: Students preparing to work with mechatronics, particularly with highly precise and smart actuators, face the challenge of designing and analyzing devices without formal and practical guidance in computer techniques. Finally there is a textbook that is as practical as it is authoritative: Kenji Uchino's FEM and Micromechatronics with ATILA Software. Ideal for Today's Computer-Based Curricula Every aspect of this book reflects its focus on being easy to use, easy to teach from, and above all, easy to implement. The first half of the text outlines the theory needed to develop and design smart actuators and transducers, while the second half walks students step-by-step through the software implementation using seven extensive examples. Even the book's lay-flat binding makes it easy for students to follow the text while working simultaneously at a computer. The companion CD-ROM supplies a free educational version of ATILA-Light. Unified Coverage for Integrated Technologies Covering the myriad challenges posed by smart transducers, the author introduces the fundamentals of piezoelectric and magnetostrictive devices, practical materials, device designs, drive and control techniques, and typical applications. Numerous problems and examples give students ample opportunity to put the concepts into practice. Outlining a complete treatment in 30 convenient 75 minute lessons, FEM and Micromechatronics with ATILA Software is a unique classroom text that students will continue to use throughout their entire careers.
Download or read book Comprehensive Study of External Field and Stress Bias Effect on Piezoelectric Properties and Loss Factors written by Hossein Daneshpajooh and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This study seeks to clarify the effect of external stress and electric field DC biases on piezoelectric material properties, specifically on piezoelectric loss factors. In order to improve the reliability, piezoelectric devices are often subjected to external electrical and mechanical biases, in many applications such as underwater transducers. While the performance and property changes under these biases have been widely investigated from a practical viewpoint, there is a significant lack of fundamental research on effect of external electric and stress bias on the loss mechanism. The piezoelectric material performance in high power applications is highly dependent on material's mechanical quality factor, which is originated from the elastic, dielectric, and piezoelectric loss factors. The study of electrical and stress bias effect on the loss parameters is expected to provide a better understanding of the microscopic origin of the loss mechanism in piezoelectric materials, in terms of domain wall dynamics. Also in practice, it can improve the finite element analysis methods used for device designing. In order to study the fundamental origin of loss mechanism in piezoelectric materials, studies of their behavior under external field and stress biases and different driving conditions are very helpful. The conventional loss characterization studies are mainly performed at low power condition and have considerable assumptions that requires to be verified. Therefore, loss characterization at high power at resonance is required to verify these methods and to distinguish the high AC drive condition effect on material performance (Chapter III). Therefore, in this study we aim to develop new methodologies to improve loss characterization methods under high AC drive condition under external DC electric field and stress biases. Accordingly, we have proposed a new methodology for high power measurement based on burst mode, for eliminating the temperature rise effect. We succeeded to measure the dielectric loss and dielectric permittivity around the resonance/antiresonance frequencies, for the first time in the world. The characterization methods used for studying DC stress and DC electric field effect on piezoelectric material properties, include various difficulties, such as clamping effect, relaxation, and creep effects. In this project, we have addressed these issues and developed more reliable characterization methodologies to provide a better examination of the effect of external biases on piezoelectric material properties and loss mechanism. Accordingly, a new methodology based on bolt clamped Langevin transducer design was proposed to study the effect of DC stress bias (Chapter IV), which succeeded to improve the measurement reliability and accuracy under external DC stress bias. Chapters V and VI describe the experimental results, where we discovered that electric field bias along positive polarization direction exhibits a decrease in both dielectric and elastic losses in k31 mode, as well as increasing elastic and dielectric losses perpendicular to spontaneous polarization direction (for both positive and negative electric field), while the compressive stress bias along polarization direction (33-direction), exhibits a decrease in the elastic loss, and dielectric loss with slight increase of piezoelectric loss. While the piezoelectric thermodynamic phenomenology has been widely studied, there is a lack of comprehensive studies on the behavior of material properties under external biases, which implies the non-linear behavior inclusion. Therefore, this project also aims to develop a comprehensive phenomenological model to clarify the nature of nonlinear material properties change under external biases (Chapter VII). Developing a comprehensive model can enhance our understanding from effects of DC electric field and stress on material properties, "real parameters", and can help the study of loss parameters, "imaginary parameters", under these effects. Therefore, we have developed a thermodynamic model based on Gibb's elastic free energy. In this study we have shown that in order to explain elastic nonlinear material changes under external stress and electric field, it is necessary to introduce higher order elastic and electrostrictive energy expansion terms (s_ijk, and Q_ijk dependent energy expansion terms, respectively). We have developed the model based on proposed energy expansion terms and verified the reliability of the model by experimental data we have accumulated during this project. The proposed model has succeeded to predict the material properties change's tendency under external biases. Also, this thesis aims to propose an intuitive model to explain the loss mechanism and specially the loss parameters behavior under external biases, based on domain wall dynamics. Though the approach is very primitive, we could correlate the domain wall damping factor with the dielectric loss parameter. The studies of loss mechanism can be very beneficial for design and production of high-power piezoelectric applications and also it can build a better understanding from heat generation due to loss mechanism. Finally, in this research we succeeded to contribute numerous achievements to study of loss mechanism in piezoelectric materials. We have succeeded to measure the effect of external electric field and external compressive stress on piezoelectric material properties and loss parameters. For the first time, we have introduced a new methodology for measurement of dielectric properties and dielectric loss at resonance condition and we have shown the effect of high power driving conditions on loss parameters for the first time. Our findings demonstrate that while conventional methods based on IEEE standard can be used at low power characterization conditions, at high power characterization systems these methods show considerable unreliability. Furthermore, we have studied the piezoelectric material properties change under external biases from phenomenological point of view and we have shown that conventional phenomenological approaches are not capable of explaining the nonlinear material change under external biases. Therefore, we have introduced both higher order elastic expansion and higher order electromechanical coupling energy expansions to explain the nonlinear material change under external biases. Our proposed model was capable of explaining all property changes under both external field and external mechanical stress. All of our achievements and industrial/scientific contributions in this research are listed and explained in detail in Chapter IX.
Download or read book MicroMechatronics Second Edition written by Kenji Uchino and published by CRC Press. This book was released on 2019-07-19 with total page 585 pages. Available in PDF, EPUB and Kindle. Book excerpt: After Uchino’s introduction of a new terminology, ‘Micromechatronics’ in 1979 for describing the application area of ‘piezoelectric actuators’, the rapid advances in semiconductor chip technology have led to a new terminology MEMS (micro-electro-mechanical-system) or even NEMS (nano-electro-mechanicalsystem) to describe mainly thin film sensor/actuator devices, a narrower area of micromechatronics coverage. New technologies, product developments and commercialization are providing the necessity of this major revision. In particular, the progresses in high power transducers, loss mechanisms in smart materials, energy harvesting and computer simulations are significant. New technologies, product developments and commercialization are providing the updating requirement for the book contents, in parallel to the deletion of old contents. Various educational/instructional example problems have been accumulated, which were integrated in the new edition in order to facilitate the self-learning for the students, and the quiz/problem creation for the instructors. Heavily revised topics from the previous edition include: high power transducers, loss mechanisms in smart materials, energy harvesting and computer simulations New technologies, product developments and commercialization helped shape the updated contents of this book where all chapters have been updated and revised. This textbook is intended for graduate students and industrial engineers studying or working in the fields of electronic materials, control system engineering, optical communications, precision machinery, and robotics. The text is designed primarily for a graduate course with the equivalent of thirty 75-minute lectures; however, it is also suitable for self-study by individuals wishing to extend their knowledge in the field.
Download or read book Partial Electrode Configuration for Loss and Physical Parameter Determination of Piezoelectric Ceramics written by Yoonsang Park and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Piezoelectric devices are driving technology in a number of industries, including sonar transducers used in military-grade underwater systems, compact electronic devices like mobile phones and digital cameras, fuel injectors, and the automobile industry. Especially, piezoelectric energy harvesting devices are to be set on "elimination of batteries", which are classified as hazardous wastes, but recycled by less than 0.5% of 10s of Billion batteries sold per year in the world. The major problem of piezoelectric devices is that further miniaturization is limited by "heat generation", owing to the "losses" in piezoelectric materials. Losses are mathematically described as imaginary parts of complex physical parameters of piezoelectric materials (that is, response phase lag to the input drive force) and categorized into three components: dielectric, elastic, and piezoelectric. These three categories of losses are further divided as I-type and E-type losses, depending on mechanical/electrical boundary conditions. The necessity of accurate loss determination of piezoelectric materials is mainly two-fold. First, I-type losses, as input parameters, greatly increase the accuracy of finite element analysis (FEA) computer simulation, which is a powerful tool to investigate desired output performance of piezoelectric devices. Second, E-type losses are helpful in elucidating heat generation mechanism that is known to limit further miniaturization and degrade the performance of high-power piezoelectric devices. Therefore, obtaining accurate values losses are important for both technological and scientific assets. The standard method to determine losses was previously established by Institute for Electrical and Electronics Engineer (IEEE) in 1980s. However, there are several deficits in this method that prevent users from obtaining accurate parameters. For example, IEEE Standard excludes existence of "piezoelectric loss", which is the key factor for heat generation mechanism. There are even more issues with IEEE Standard on piezoelectricity in k33 mode, such as small capacitance and electric field leakage that hinders researchers from obtaining accurate losses. Furthermore, IEEE Standard does not provide the method to obtain both I-type and E-type loss factors, as well as the method to characterize unpoled piezoelectric materials that take up majority of the volumes of many types of piezoelectric devices. In order to resolve such disadvantages of IEEE Standard, partial electrode (PE) method, which utilizes samples with PE configuration, is proposed in this Ph. D. Dissertation. PE configuration is a plate structure that is composed of electrically excited and measured center part and the mechanically excited side parts. Since the purpose of PE configuration is to characterize properties of the side part, center part is maintained to about 10 % of the length of plate, whereas side parts take up about 90 % of the entire length. This particular characterization methodology is based on mechanical excitation, which is different from electrical excitation method suggested by IEEE Standard. The sample preparation is not significantly laborious compared to the preparation of IEEE Standard samples, since it only has an additional electrode sputtering and one additional poling step. The measurement is done through the center part with capacitance about 200 times larger than IEEE Standard. Therefore, the measurements do not suffer from small capacitance issue. It also enables characterization of both I-type and E-type losses simply by covering the side part with electrode or not, respectively. Moreover, with mechanical excitation, it is possible to characterize unpoled piezoelectric materials, which cannot be electrically excited due to zero piezoelectricity. This thesis is composed of seven chapters. Chapter 1 deals with theoretical backgrounds necessary to understand basics of high-power piezoelectric devices and loss mechanisms. Chapter 2 details deficits of current IEEE Standards for selected vibration modes (k31 and k33 modes) to explain necessity for new characterization method for better accuracy, along with some brief background of standard measurement methods and contributions from other researchers. Chapter 3 proposes PE method to resolve IEEE Standards issues, along with analytical and simulation approaches, Chapter 4 demonstrates error analysis and Chapter 5 show determined losses and physical parameters with PE method, along with brief discissions on materials differences. Chapter 6 represents PE method for characterization of unpoled piezoelectric ceramics and physical explanation related to domain and grain charge configuration for elastic intermediacy of unpoled piezoceramics. Finally, Chapter 7 summarizes the thesis and provide future work.
Download or read book Electronic Ceramic Materials and Devices written by K. M. Nair and published by . This book was released on 2000 with total page 578 pages. Available in PDF, EPUB and Kindle. Book excerpt:
