November 28, 2020

Download Ebook Free Dielectric Elastomers As Electromechanical Transducers

Dielectric Elastomers as Electromechanical Transducers

Dielectric Elastomers as Electromechanical Transducers
Author : Federico Carpi,Danilo De Rossi,Roy Kornbluh,Ronald Edward Pelrine,Peter Sommer-Larsen
Publisher : Elsevier
Release Date : 2011-09-06
Category : Technology & Engineering
Total pages :344
GET BOOK

Dielectric Elastomers as Electromechanical Transducers provides a comprehensive and updated insight into dielectric elastomers; one of the most promising classes of polymer-based smart materials and technologies. This technology can be used in a very broad range of applications, from robotics and automation to the biomedical field. The need for improved transducer performance has resulted in considerable efforts towards the development of devices relying on materials with intrinsic transduction properties. These materials, often termed as “smart or “intelligent , include improved piezoelectrics and magnetostrictive or shape-memory materials. Emerging electromechanical transduction technologies, based on so-called ElectroActive Polymers (EAP), have gained considerable attention. EAP offer the potential for performance exceeding other smart materials, while retaining the cost and versatility inherent to polymer materials. Within the EAP family, “dielectric elastomers , are of particular interest as they show good overall performance, simplicity of structure and robustness. Dielectric elastomer transducers are rapidly emerging as high-performance “pseudo-muscular actuators, useful for different kinds of tasks. Further, in addition to actuation, dielectric elastomers have also been shown to offer unique possibilities for improved generator and sensing devices. Dielectric elastomer transduction is enabling an enormous range of new applications that were precluded to any other EAP or smart-material technology until recently. This book provides a comprehensive and updated insight into dielectric elastomer transduction, covering all its fundamental aspects. The book deals with transduction principles, basic materials properties, design of efficient device architectures, material and device modelling, along with applications. Concise and comprehensive treatment for practitioners and academics Guides the reader through the latest developments in electroactive-polymer-based technology Designed for ease of use with sections on fundamentals, materials, devices, models and applications

Electromechanical Coupling Behavior of Dielectric Elastomer Transducers

Electromechanical Coupling Behavior of Dielectric Elastomer Transducers
Author : Jianyou Zhou
Publisher : Unknown
Release Date : 2015
Category :
Total pages :278
GET BOOK

Dielectric elastomer transducers with large deformation, high energy output, light weight and low cost have been drawing great interest from both the research and industry communities, and shown potential for versatile applications in biomimetics, dynamics, robotics and energy harvesting. However, in addition to multiple failure modes such as electrical breakdown, electromechanical instability, loss-of- tension and fatigue, the performance of dielectric elastomer transducers are also strongly influenced by the hyperelastic and viscoelastic properties of the material. Also, the interplay among these material properties and the failure modes is rather difficult to predict. Therefore, in order to provide guidelines for the optimal design of dielectric elastomer transducers, it is essential to first develop accurate and reliable models, and efficient numerical methods to investigate their performance. First, this thesis purposes a boundary- constraint method to eliminate the electromechanical instability of dielectric elastomer actuators under voltage-control loading condition and improve their actuation deformation. Second, based on the finite-deformation viscoelasticity model, the natural frequency tuning process of viscoelastic dielectric elastomer resonators is examined in this work. It is found that the tuned natural frequency is highly affected by the material viscoelasticity. Also, it is concluded that the electrical loading rate only influences the tunable frequency range and the safe operation voltage of the resonator, but not the tuned natural frequency when the applied voltage is within the safe range. Third, with the finite-deformation viscoelasticity model, the energy conversion efficiency of dielectric elastomer generators under equi-biaxial loading is also investigated in this work. Simulation results show that increasing the maximum stretch ratio and the rate of defor mation, and choosing a proper bias voltage can lead to an improvement of the energy conversion efficiency. Furthermore, the fatigue life of dielectric elastomer devices under cyclic loading is explored in this work for the first time . Simulation results have demonstrated that the energy conversion efficiency of dielectric elastomer generators is compromised by their fatigue life. To tackle the critical challenges for the development and design of dielectric elastomers transducers, this research develops theoretical models and numerical methods that are able to capture the nonlinear electromechanical coupling, the material properties, the typical failure modes and different operating conditions of dielectric elastomer transducers. With more accurate and reliable modeling methods, this work is expected to provide a comprehensive understanding on the fundamentals and technologies of dielectric elastomer transducers and trigger more innovative and optimal design of such devices.

Electroactivity in Polymeric Materials

Electroactivity in Polymeric Materials
Author : Lenore Rasmussen
Publisher : Springer Science & Business Media
Release Date : 2012-03-02
Category : Technology & Engineering
Total pages :162
GET BOOK

Electroactivity in Polymeric Materials provides an in-depth view of the theory of electroactivity and explores exactly how and why various electroactive phenomena occur. The book explains the theory behind electroactive bending (including ion-polymer-metal-composites –IPMCs), dielectric elastomers, electroactive contraction, and electroactive contraction-expansion cycles. The book also balances theory with applications – how electroactivity can be used – drawing inspiration from the manmade mechanical world and the natural world around us.

Advances in Energy Harvesting Methods

Advances in Energy Harvesting Methods
Author : Niell Elvin,Alper Erturk
Publisher : Springer Science & Business Media
Release Date : 2013-02-15
Category : Science
Total pages :455
GET BOOK

Advances in Energy Harvesting Methods presents a state-of-the-art understanding of diverse aspects of energy harvesting with a focus on: broadband energy conversion, new concepts in electronic circuits, and novel materials. This book covers recent advances in energy harvesting using different transduction mechanisms; these include methods of performance enhancement using nonlinear effects, non-harmonic forms of excitation and non-resonant energy harvesting, fluidic energy harvesting, and advances in both low-power electronics as well as material science. The contributors include a brief literature review of prior research with each chapter for further reference.

Living machines

Living machines
Author : Tony J. Prescott,Nathan Lepora,Paul F. M. J Verschure
Publisher : Oxford University Press
Release Date : 2018-04-19
Category : Medical
Total pages :632
GET BOOK

Contemporary research in the field of robotics attempts to harness the versatility and sustainability of living organisms. By exploiting those natural principles, scientists hope to render a renewable, adaptable, and robust class of technology that can facilitate self-repairing, social, and moral—even conscious—machines. This is the realm of robotics that scientists call "the living machine". Living Machines can be divided into two entities-biomimetic systems, those that harness the principles discovered in nature and embody them in new artifacts, and biohybrid systems, which couple biological entities with synthetic ones. Living Machines: A handbook of research in biomimetic and biohybrid systems surveys this flourishing area of research. It captures the current state of play and points to the opportunities ahead, addressing such fields as self-organization and co-operativity, biologically-inspired active materials, self-assembly and self-repair, learning, memory, control architectures and self-regulation, locomotion in air, on land or in water, perception, cognition, control, and communication. In all of these areas, the potential of biomimetics is shown through the construction of a wide range of different biomimetic devices and animal-like robots. Biohybrid systems is a relatively new field, with exciting and largely unknown potential, but one that is likely to shape the future of humanity. Chapters outline current research in areas including brain-machine interfaces-where neurons are connected to microscopic sensors and actuators-and various forms of intelligent prostheses from sensory devices like artificial retinas, to life-like artificial limbs, brain implants, and virtual reality-based rehabilitation approaches. The handbook concludes by exploring the impact living machine technology will have on both society and the individual, by forcing human beings to question how we see and understand ourselves. With contributions from leading researchers drawing on ideas from science, engineering, and the humanities, this handbook will appeal to both undergraduate and postgraduate students of biomimetic and biohybrid technologies. Researchers in the areas of computational modeling and engineering, including artificial intelligence, machine learning, artificial life, biorobotics, neurorobotics, and human-machine interfaces, will find Living Machines an invaluable resource.

Disability and Equity at Work

Disability and Equity at Work
Author : Jody Heymann,Michael Ashley Stein,Gonzalo Moreno
Publisher : Oxford University Press
Release Date : 2013-12-13
Category : Medical
Total pages :352
GET BOOK

Despite international and national guarantees of equal rights, there remains a great deal to be done to achieve global employment equality for individuals with disabilities. In OECD countries, the employment rate of persons with disabilities was just over 40%, compared to 75% for persons without a disability; in many low- and middle-income countries, the employment rates are even lower. There are numerous reasons why persons with disabilities fare poorly in the labor market; Disability and Equity at Work is the first book to document what can be done to improve this imbalance. Chapters in this volume address all relevant facets of this topic and include: · Extensive examination of the factors contributing to inequitable access to work among persons with disability · Analysis of the economic benefits of increasing employment equity · Successful employment strategies at every stage of a worker's career · Evidence-based recommendations and in-depth case studies of innovative policies and programs around the world Chapter contributors include leaders from international organizations, government, civil society, and academia, including experts from UN agencies, leaders in nongovernmental advocacy and research organizations, and senior academics in the field. Disability and Equity at Work fills a needed gap that will appeal to those interested in and engaged in public policy, global health, equal rights, business, labor, and other fields.

Elastomers

Elastomers
Author : Nevin Çankaya
Publisher : BoD – Books on Demand
Release Date : 2017-08-30
Category : Science
Total pages :264
GET BOOK

Summary-Book Contents: Your purpose of reading this book is to concentrate on recent developments on elastomers. The articles collected in this book are contributions by invited researchers with a long-standing experience in different research areas. I hope that the material presented here is understandable to a broad audience, not only scientists but also people with many different disciplines. The book contains eleven chapters in two sections: (1) "Mechanical Properties of Elastomers" and (2) "Elastomers for Natural and Medical Applications." The book provides detailed and current reviews in these different areas written by experts in their respective fields. This book will be useful for polymer workers and other scientists alike and will contribute to the training of current and future researchers, academics, PhD students, and other scientists.

Electromechanically Active Polymers

Electromechanically Active Polymers
Author : Federico Carpi
Publisher : Unknown
Release Date : 2020
Category : Polymers
Total pages :129
GET BOOK

Artificial Muscle Actuators using Electroactive Polymers

Artificial Muscle Actuators using Electroactive Polymers
Author : Pietro Vincenzini,Yoseph Bar-Cohen,Federico Carpi
Publisher : Trans Tech Publications Ltd
Release Date : 2008-09-02
Category : Technology & Engineering
Total pages :216
GET BOOK

The 27 peer-reviewed papers collected here together offer a plenitude of up-to-date information on “Artificial Muscle Actuators using Electroactive Polymers”. The papers are conveniently arranged into the chapters: 1: Materials; 2: Analysis, physical mechanisms and characterization; 3: Devices and applications. This special volume has also been published online in the series, “Advances in Science and Technology” Vol. 61.

Model-based Self-sensing Algorithm for Dielectric Elastomer Transducers Based on an Extended Kalman Filter

Model-based Self-sensing Algorithm for Dielectric Elastomer Transducers Based on an Extended Kalman Filter
Author : Anonim
Publisher : Unknown
Release Date : 2018
Category :
Total pages :129
GET BOOK

Abstract: Self-sensing enables electromechanical transducers of being simultaneously used for actuating and sensing without additional, external sensors. In case of dielectric elastomer (DE) transducers the shape-varying, strain-dependent capacitance is usually considered for this purpose and estimated based on the measured terminal voltage and current. In the literature most self-sensing algorithms for DE transducers require an explicit superimposition of an additional AC excitation signal. Thus, only power supplies providing the opportunity of superimposing this excitation signal can be used for this purpose. Within this contribution we propose a new approach based on an extended Kalman filter. It operates with any arbitrary driving signal and thus does not require a superimposed excitation. Here, the extended Kalman filter is used for both the estimation of the inner states and parameters of the nonlinear process. The accuracy and dynamics of the estimation results obtained with proposed self-sensing approach are demonstrated by comparing the estimated with the measured transducer strain. The measurements are conducted with two different power supplies showing the applicability and robustness of the proposed self-sensing approach ensuring reliable and accurate estimation results independent of the kind of excitation signal. Here, the utilized high voltage amplifier represents a common power supply for experimental studies in laboratory environment. In contrast, the bidirectional flyback-converter is an energy-efficient and economical opportunity for feeding of DE transducers in technologically sophisticated applications. However, due to its operation principle it does not provide the opportunity to superimpose particular sensing signals so that this new approach is required to enable the self-sensing capability.

Energy Harvesting

Energy Harvesting
Author : Reccab Manyala
Publisher : BoD – Books on Demand
Release Date : 2018-06-27
Category : Technology & Engineering
Total pages :92
GET BOOK

This book contains chapters that discuss numerous methods and techniques in energy harvesting. Both theoretical and experimental results are presented from investigations that were carried out in the various chapters. Well-grounding methods and techniques presented in the new areas provide a good head start not only to those with interest in energy harvesting but also to experienced researchers who may want to look at energy harvesting from different angles. The concepts of energy harvesting are well articulated in the introduction of each chapter. It is my sincere hope that the readers of this book will find it a useful fountain of knowledge in energy harvesting.

Electroactive Polymers for Robotic Applications

Electroactive Polymers for Robotic Applications
Author : Kwang J. Kim,Satoshi Tadokoro
Publisher : Springer Science & Business Media
Release Date : 2007-01-17
Category : Technology & Engineering
Total pages :281
GET BOOK

This book covers the fundamental properties, modeling, and demonstration of Electroactive polymers in robotic applications. It particularly details artificial muscles and sensors. In addition, the book discusses the properties and uses in robotics applications of ionic polymer–metal composite actuators and dielectric elastomers.

Dielectric Elastomer Sensors

Dielectric Elastomer Sensors
Author : Na Ni
Publisher : Unknown
Release Date : 2017
Category : Science
Total pages :129
GET BOOK

Dielectric elastomers (DEs) represent a class of electroactive polymers (EAPs) that exhibit a significant electromechanical effect, which has made them very attractive over the last several decades for use as soft actuators, sensors and generators. Based on the principle of a plane-parallel capacitor, dielectric elastomer sensors consist of a flexible and stretchable dielectric polymer sandwiched between two compliant electrodes. With the development of elastic polymers and stretchable conductors, flexible and sensitive dielectric elastomer tactile sensors, similar to human skin, have been used for measuring mechanical deformations, such as pressure, strain, shear and torsion. For high sensitivity and fast response, air gaps and microstructural dielectric layers are employed in pressure sensors or multiaxial force sensors. Multimodal dielectric elastomer sensors have been reported that can detect mechanical deformation but can also sense temperature, humidity, as well as chemical and biological stimulation in human-activity monitoring and personal healthcare. Hence, dielectric elastomer sensors have great potential for applications in soft robotics, wearable devices, medical diagnostic and structural health monitoring, because of their large deformation, low cost, ease of fabrication and ease of integration into monitored structures.

Electroactive Polymer (EAP) Actuators as Artificial Muscles

Electroactive Polymer (EAP) Actuators as Artificial Muscles
Author : Yoseph Bar-Cohen
Publisher : SPIE Press
Release Date : 2004-01-01
Category : Medical
Total pages :765
GET BOOK

In concept and execution, this book covers the field of EAP with careful attention to all its key aspects and full infrastructure, including the available materials, analytical models, processing techniques, and characterization methods. In this second edition the reader is brought current on promising advances in EAP that have occurred in electric EAP, electroactive polymer gels, ionomeric polymer-metal composites, carbon nanotube actuators, and more. 'Electroactive Polymer (EAP) Actuators as Artificial Muscles' is a delightful book dealing with one of the hottest topics in biomedical engineering. Virtually every known method of generating displacement is introduced. This book is a must for anyone interested in actuators and sensors, including physicians and biomedical, chemical, electrical, and material engineers. It is thorough in every way.... --Steven S. Saliterman, MD, FACP, Chief of Medicine Methodist Hospital; Department of Biomedical Engineering, University of Minnesota

Materials Science & Engineering

Materials Science & Engineering
Author : Anonim
Publisher : Unknown
Release Date : 2007
Category : Biochemistry
Total pages :129
GET BOOK