Thèses sur le sujet « Actuating »
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Bernier, Jobe Paul. « Entropy and Architecture entropic phenomena actuating dynamic space / ». Thesis, Montana State University, 2008. http://etd.lib.montana.edu/etd/2008/bernier/BernierJ0508.pdf.
Texte intégralKwok, Christopher (Christopher L. ). « Exploring and evaluating methods of actuating an active lens ». Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/105694.
Texte intégralCataloged from PDF version of thesis.
Includes bibliographical references (page 24).
Active lenses today have a variety of uses from photographic capabilities in small mobile devices to applications in engineering. They provide faster response times and higher portability and efficiency when compared to their traditional lens assemblies. For this project, I have evaluated two different methods of active lens actuation: using an electromagnetic actuator and using an electroactive polymer. From testing each method's abilities, it was found that the electromagnetic actuator, though robust in design poses issues over long-time use. The electromagnetic actuator was able to generate a focal power range of 11.9 to 19.2 diopters (52 to 84mm focal length range), but a high power consumption led to problems with heating the internal components of the active lens assembly. In the EAP method, a lower power consumption proved to be a viable option for actuation, and through testing and calculation, it was determined to be useful in application. However, a proposed efficient design must be further explored.
by Christopher Kwok.
S.B.
Johnson, Roger Warren. « Design and development of a three link in-parallel actuating prototype manipulator ». Thesis, Georgia Institute of Technology, 1988. http://hdl.handle.net/1853/15961.
Texte intégralMcMahon, Michael. « A novel accelerated life cycle methodology for actuating MEMS membranes via mechanical contact : innovation report ». Thesis, University of Warwick, 2011. http://wrap.warwick.ac.uk/45946/.
Texte intégralMarett, Josh Michael. « The Isolation of Cellulose Nanocrystals from Pistachio Shells and Their Use in Water Actuating Smart Composites ». Thesis, Virginia Tech, 2017. http://hdl.handle.net/10919/78902.
Texte intégralMaster of Science
Meisel, Nicholas Alexander. « Design for Additive Manufacturing Considerations for Self-Actuating Compliant Mechanisms Created via Multi-Material PolyJet 3D Printing ». Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/54033.
Texte intégralPh. D.
Gorges, Stephan [Verfasser], René [Akademischer Betreuer] Theska, Christoph [Gutachter] Schäffel et Bernd Hans [Gutachter] Schmidt. « A lifting and actuating unit for a planar nanoprecision drive system / Stephan Gorges ; Gutachter : Christoph Schäffel, Bernd Hans Schmidt ; Betreuer : René Theska ». Ilmenau : TU Ilmenau, 2020. http://d-nb.info/1224416589/34.
Texte intégralÚšela, Tomáš. « Revolverová hlava pro dlouhotočný automat s elektricky ovládaným indexováním ». Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-227980.
Texte intégralGuiducci, Lorenzo. « Passive biomimetic actuators : the role of material architecture ». Phd thesis, Universität Potsdam, 2013. http://opus.kobv.de/ubp/volltexte/2014/7044/.
Texte intégralPassive pflanzliche Aktuatoren sind bewegliche Strukturen, die eine komplexe Bewegung ohne jegliche metabolische Energiequelle erzeugen können. Diese Fähigkeit entstammt dabei der Materialverteilung mit unterschiedlicher Quellbarkeit innerhalb der Gewebsstruktur.Die bis heute am besten untersuchten Gewebearten pflanzlicher und künstlicher Passivaktuatoren sind Faserverbundwerkstoffe, in denen steife, fast undehnbare Zellulosemikrofibrillen die ansonsten isotrope Schwellung einer Matrix leiten. Darüber hinaus gibt es in der Natur Beispiele für Aktuationssysteme, wie z.B. die Delosoperma nakurense Samenkapsel, in der das Aktuatorgewebe eine Wabenstruktur aufweist, deren Zellen mit einem hochquellenden Material gefüllt sind. Dabei hat die Wabenstruktur des Gewebes eine hohe geometrische Anisotropie, so dass sich das Gewebe bei Wasseraufnahme bis zur vierfachen Länge entlang einer Hauptrichtung ausdehnt und somit die reversible Öffnung der Kapsel angetrieben wird. Inspiriert durch das Vorbild der Delosoperma nakurense, wird in der vorliegenden Arbeit die Rolle der Architektur von 2D-Zellulärmaterialien als Modell für natürliche passive Aktuatoren analysiert. Zunächst wird anhand eines einfachen Flüssigkeitsdrucks in den Zellen der Einfluss verschiedener architektonischer Parameter auf deren mechanische Betätigung untersucht. Wohingegen regelmäßige konvexe Wabenstrukturen (wie z. B. sechseckige, dreieckige oder quadratische Gitter) sich unter Druck isotropisch verformen, wird durch Finite-Elemente-Simulationen gezeigt, dass es bei anisotropen und nicht-konvexen Zellen zu großen Ausdehnungen jeder einzelnen Zelle kommt. Auch wenn nur eine einzelne Zellgeometrie betrachtet wird, können hierbei viele verschiedene Gitter entstehen. Die Ausdehnungsrichtung des Gitters ist variabel und hängt von der lokalen Konnektivität der Zellen ab. Dies hat Auswirkungen sowohl auf makroskopischer (Gitter-) als auch auf mikroskopischer (Zell-) Ebene. Auf makroskopischer Ebene erfahren diese nicht-konvexen Gitter entweder große anisotrope (ähnlich der Delosperma nakurense Samenkapsel) oder vollkommen isotrope Eigendehnungen, große Scherverformungen oder jeweilige Mischformen. Überdies können Gitter mit ähnlichem makroskopischem Verhalten gänzlich unterschiedliche mikroskopische Verformungsmuster zeigen, wie z.B. Zick-Zack-Bewegungen oder radikale Änderungen der ursprünglichen Zellform. Dies verursacht auch eine entsprechende Änderung der elastischen Eigenschaften. In Abhängigkeit der Gitterarchitektur kann es zu gleichen oder unterschiedlichen mikroskopischen Zelldeformationen kommen, die sich in Summe entweder verstärken oder ausgleichen, und somit die Vielzahl an makroskopischen Verhalten erklären. Interessanterweise lassen sich mit Hilfe einfacher geometrischer Argumente aus der nichtdeformierten Zellform und Zellkonnektivität die Ergebnisse der FE-Simulationen vorhersagen. Die Ergebnisse der Finite-Elemente-Simulationen wurden durch Laborversuche bestätigt, in denen (mit 3D-Drucktechnik gefertigte) Modellgitter ähnliches Ausdehnungsverhalten beim Quellen zeigen. Diese Arbeit zeigt auf, wie die Innenarchitektur eines quellfähigen zellulären Feststoffs zu komplexen Formänderungen führen kann, die in den Bereichen der Soft-Robotik oder bei Morphing-Strukturen angewandt werden können.
Wenzel, Ute Verfasser], Ivo W. [Akademischer Betreuer] [Rangelow, D. Frank [Akademischer Betreuer] Ogletree et Teodor P. [Akademischer Betreuer] Gotszalk. « Fabrication and characterization of self-sensing and self-actuating piezoresistive microscale silicon cantilevers for an integrated scanning probe microscopy and scanning electron microscopy system / Ute Wenzel. Gutachter : D. Frank Ogletree ; Teodor P. Gotszalk. Betreuer : Ivo W. Rangelow ». Ilmenau : Universitätsbibliothek Ilmenau, 2013. http://d-nb.info/1034527770/34.
Texte intégralIamratanakul, Dhanakorn. « Pre-actuation and post-actuation in control applications / ». Thesis, Connect to this title online ; UW restricted, 2007. http://hdl.handle.net/1773/9968.
Texte intégralRocco, Pete Angelo. « Actuation training and its effects on actuation fatigue of Nitinol Shape Memory Wires ». University of Toledo / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1564737605232559.
Texte intégralMcEwan, William Thomas. « Periodic actuation of vortex generators ». Thesis, Queen's University Belfast, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.485005.
Texte intégralGomez, Teresa M. « Binary actuation of solar mirrors ». Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/68528.
Texte intégralCataloged from PDF version of thesis.
Includes bibliographical references (p. 42).
This thesis explores the use of binary actuators to adjust the shape of an array of mirrors. To explore this concept, an experimental system was refurbished and recalibrated. This experimental system was used to explore the range of possible configurations that could be reached by a simple binary actuated system. System models are required for accurate control of these binary actuated structures. This thesis develops and tests the accuracy of two different modeling approaches, linear and iterative. The linear model assumes that each actuator contributes a constant value to the angle of the center mirror, and that this value is not dependent on the other actuator positions. The actuator contributions are summed to find the angle of the center mirror. These contributions are found two ways: by taking a relevant single data point for each actuator, and by using a least squares fitting of a large subset of data. The iterative model assumes that each actuator adds some constant value, similar to the previous model, and that it also adds some portion of the current angle. A multiplication and shift are therefore found for each actuator, and these multiplications and shifts successively applied, starting with the initial angles, to find the final angular position. While the linear model with measured values for the actuator contributions predicted the data poorly, the linear model with the least squares fitted values performed much better. The iterative model initially produced large errors, but these errors were found to be readily correctable and once removed, the iterative model predicted the data better than the linear model.
by Teresa M. Gomez.
S.B.
Ahir, Samit Vallabhbhai. « Nanotube-polymer actuation & ; relaxation ». Thesis, University of Cambridge, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.612763.
Texte intégralLauback, Stephanie Diane. « Magnetic Actuation of Biological Systems ». The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1494262695434601.
Texte intégralGustavsson, Sofie, et Anders Carlsson. « Electric Actuation of Controllable Pitch Propellers ». Thesis, Karlstad University, Faculty of Technology and Science, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-3771.
Texte intégralThis bachelor’s degree project has been conducted at the Innovation and Design Engineering programme at Karlstad University and responds to 22.5 ETCS credits. The project has been carried out in co-operation with Rolls-Royce AB in Kristinehamn.
Based upon a virtual order concerning a super yacht the objective has been to develop a controllable pitch propeller that is adjusted using electro mechanics, to eliminate the use of hydraulic oils and thus the risk of leakage to the seawater.
The pre-study consisted of the two first phases of QFD-analysis (Quality Function Deployment). The first phase consists of gathering customer requirements. Representatives from different functions within Rolls-Royce AB were interviewed, as representatives for the customer. The demands they presented were used to find product features and functionalities.
The results were put together in two Houses of Quality. The first house shows the relations between requirements and features/functionalities and their respective relevance in correlation to each other. House of Quality two describes the relations between features/functionalities and design solutions in a similar way.
Based upon the QFD-analysis, a specification was generated to be used as guidance to generate ideas of how to solve the problem. A number of brainstorming methods were used and students from Karlstad University and Rolls-Royce AB participated in those sessions. Overall, some twenty ideas were gathered and five of those were considered feasible concepts.
For further development, two of those concepts were chosen, using relative and weighted decision matrixes. This development consisted of solid modelling, based on current propeller arrangement designs, and stress calculations of the new parts of the system.
Both concepts consist of an electrical engine, powering a trapezoid screw, which moves the crosshead. In Concept 1, the screw is mounted directly into the crosshead while in Concept 2; a push rod is used to transmit the motion. Both concepts appeared to meet up to the objectives, though Concept 1 fulfilled more demands and to a greater extent.
For further development of this product, customer inquiries with closer customer contacts need to be conducted. It will also be necessary to contact the concerned classing societies, since current classification rules not can be applied to electromechanically controlled propellers.
Detta examensarbete har utförts för examen på Innovations- och designingenjörsprogrammet vid Karlstads universitet och motsvarar 22,5 hp. Projektet har genomförts tillsammans med Rolls-Royce AB i Kristinehamn.
Baserad på en virtuell order på en superyacht har målet varit att utveckla en justerbar propeller som regleras helt med elektromekanik. Detta för att eliminera användandet av hydraulolja och därmed risken för läckage till havsvattnet.
Förstudien har bestått av de två första faserna av QFD-studie (Quality Function Deployment). Den första fasen består av insamlande av kundernas önskemål. Olika representanter inom företaget, som fått representera slutkunden, intervjuades och de önskemål som kom fram användes för att hitta produktegenskaper och funktioner.
Resultaten sammanställdes i två kvalitetshus (House of Quality). Det första visar förhållandet mellan önskemål och egenskaper/funktioner samt deras respektive relevans i förhållande till varandra. Hus två beskriver på samma sätt förhållandet mellan egenskaper/funktioner och konstruktionslösningar.
Utifrån QFD-studien sammanställdes en specifikation som användes som mall för att generera idéer kring lösningen av problemet. Ett antal olika kreativitetsmetoder användes och studenter från Karlstads universitet samt anställda från Rolls-Royce AB deltog i sessionerna. Totalt togs ett tjugotal idéer fram och fem av dessa bedömdes vara genomförbara koncept.
Två av koncepten valdes ut, med hjälp av en relativ viktad kriterievalsmatris, för att utvecklas vidare. Utvecklingen bestod i att göra solidmodeller, baserat på de befintliga delarna i propellerarrangemanget, samt hållfasthetsberäkningar av de nya delar som kom att ingå i systemet.
Båda koncepten bygger på att en trapetsgängad skruv, driven av en elmotor, förflyttar kolvstångshuvudet. I koncept 1 är skruven monterad direkt i detta och i koncept 2 överförs rörelsen via en tryckstång. Båda koncepten föreföll sig lösa det uppsatta problemet även om koncept 1 visade sig uppfylla fler önskemål och i högre utsträckning.
För att komma vidare med produkten bör kundundersökningar med närmare kontakter till kunden genomföras. Det är också nödvändigt att kontakta berörda klassningssällskap, då dagens klassningsregler ej kan appliceras på elektromekaniska propellrar.
Miller, Adam Cole. « Flow control via synthetic jet actuation ». Texas A&M University, 2004. http://hdl.handle.net/1969.1/1409.
Texte intégralGilson, Gareth M. « Cooling of advanced aircraft actuation systems ». Thesis, University of Nottingham, 2012. http://eprints.nottingham.ac.uk/12568/.
Texte intégralLazarus, Kenneth B. « Induced strain actuation of composite plates ». Thesis, Massachusetts Institute of Technology, 1989. http://hdl.handle.net/1721.1/41235.
Texte intégralBent, Aaron Alton. « Piezoelectric fiber composites for structural actuation ». Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/12322.
Texte intégralBent, Aaron Alton. « Active fiber composites for structural actuation ». Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/10254.
Texte intégralLeung, Anthony Chi Hin. « Actuation properties of kagome lattice structures ». Thesis, University of Cambridge, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.613328.
Texte intégralLi, Wei. « More Electric Landing Gear Actuation Study ». Thesis, Cranfield University, 2009. http://dspace.lib.cranfield.ac.uk/handle/1826/9589.
Texte intégralO'Brien, Sean D. « Electro-osmotic actuation for micropump applications / ». Online version of thesis, 2009. http://hdl.handle.net/1850/11634.
Texte intégralRichardson, Robert C. « Actuation and control for robotic physiotherapy ». Thesis, University of Leeds, 2001. http://etheses.whiterose.ac.uk/1534/.
Texte intégralMaldonado, Luis A. « A methodology for evaluating mine actuation data ». Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1996. http://handle.dtic.mil/100.2/ADA311410.
Texte intégralMeng, Fanliang. « Actuation system design with electrically powered actuators ». Thesis, Cranfield University, 2011. http://dspace.lib.cranfield.ac.uk/handle/1826/6282.
Texte intégralMcKenzie, James Stuart. « Optical actuation and control-by-light systems ». Thesis, Brunel University, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.286728.
Texte intégralSyvertsen, James Michael. « Force override rate controller for remote actuation ». Thesis, Monterey, California. Naval Postgraduate School, 1992. http://hdl.handle.net/10945/23905.
Texte intégralMany remotely operated robotic manipulator systems are operated in rate control mode to achieve a commanded position and orientation of the end-effector. Performance of certain tasks, such as applying a torque to a screw, would be more efficient if performed in unilateral force control mode. A six axis force-torque model was developed to determine the required number and positioning of sensors and using force sensing resistors, a prototype force-torque transducer was built for testing. Using a force error signal, individual manipulator joint angles may be computed in an algorithm to achieve force replication in the end-effector.
Yu, Tian. « Actuation and control of lower limb prostheses ». Thesis, University of Bath, 2017. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.760933.
Texte intégralLai, Guanyu. « Distributed actuation and control for morphing structures ». Thesis, University of Bath, 2017. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.760934.
Texte intégralHenderson, Jean-Paul. « Vibration isolation for rotorcraft using electrical actuation ». Thesis, University of Bath, 2012. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.558879.
Texte intégralEslinger, Gregory John. « Dynamic programming applied to electromagnetic satellite actuation ». Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/82480.
Texte intégralThis electronic version was submitted and approved by the author's academic department as part of an electronic thesis pilot project. The certified thesis is available in the Institute Archives and Special Collections.
"June 2013." Cataloged from department-submitted PDF version of thesis
Includes bibliographical references (p. 135-140).
Electromagnetic formation flight (EMFF) is an enabling technology for a number of space mission architectures. While much work has been done for EMFF control for large separation distances, little work has been done for close-proximity EMFF control, where the system dynamics are quite complex. Dynamic programming has been heavily used in the optimization world, but not on embedded systems. In this thesis, dynamic programming is applied to satellite control, using close-proximity EMFF control as a case study. The concepts of dynamic programming and approximate dynamic programming are discussed. Several versions of the close-proximity EMFF control problem are formulated as a dynamic programming problems. One of the formulations is used as a case study for developing and examining the cost-to-go. Methods for implementing an approximate dynamic programming controller on a satellite are discussed. Methods for resolving physical states and dynamic programming states are presented. Because the success of dynamic programming depends on the system model, a novel method for finding the mass properties of a satellite, which would likely be used in the dynamic programming model, is introduced. This method is used to characterize the mass properties of three satellite systems: SPHERES, VERTIGO, and RINGS. Finally, a method for position and attitude estimation for systems that use line-of-sight measurements that does not require the use of a model is developed. This method is useful for model validation of the models used in the dynamic programming formulation.
by Gregory John Eslinger.
S.M.
Steyn, J. Lodewyk (Jasper Lodewyk) 1976. « Hydraulic amplification for actuation in microelectromechanical systems ». Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/16834.
Texte intégralIncludes bibliographical references (p. [121]-123).
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
In this work the concept of hydraulic amplification as a means of stroke amplification is explored for applications in MicroElectroMechanical Systems (MEMS). Building on the batch fabrication technologies of the semiconductor industry, MEMS technology could enable the simultaneous fabrication of multiple microhydraulic systems of which hydraulic amplifiers would form part. Precision lithography would furthermore make dense arrays of microhydraulic systems possible, with the eventual goal being to create high power density microscale actuation and power generation systems. This document provides an overview of the design considerations required for a successful microfabricated hydraulic amplifier, and proceeds to discuss the techniques developed to successfully fabricate, assemble and test such a device. Deep Reactive Ion Etching (DRIE) techniques were developed for creating strong tethered membrane structures using Silicon On Insulator (SOI) technology. Bonding techniques included silicon-silicon fusion bonding of fragile wafers and silicon-glass anodic bonding and alignment on the wafer and die level to produce multi-layered structures. Liquid filling of micromachined dead volumes through micron-size channels was performed. Static sealing techniques for leak-free sealing of micromachined, filled dead volumes with minimal seal compression and dynamic sealing techniques when quasi-static actuation is not a prerequisite were successfully developed. Using these techniques, several hydraulic amplification devices have been produced. Testing of these devices revealed good correlation with theoretical predictions. Stroke amplification ratios as high as 48 : 1 have been observed. In addition, natural frequencies of up to 10kHz were measured. In conclusion, this work verifies the viability of hydraulic amplification for applications in microscale actuation systems.
by J. Lodewyk Steyn.
S.M.
Hartwell, Ashley (Ashley Jessica). « Shape Memory Alloys for small scale actuation ». Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/118714.
Texte intégralCataloged from PDF version of thesis.
Includes bibliographical references (pages 51-52).
Shape Memory Alloys (SMAs), materials that can undergo a fully recoverable strain change due to a thermal cycle, and which can be produced in a form that is superelastic are only utilized limitedly. In this thesis, I investigated the relationship between the material properties of shape memory alloy micro-wires and their mechanical performance. This study was conducted with two main types of SMAs, the first a commercially available NiTi wire, and the second an emerging Cu-based alternative. This comparison allows an understanding of the current state of the art for small scale actuation with SMA wires, and to evaluate the Cu-based alternative SMA, which has a reduced cost and improved thermal properties. This thesis evaluates Cu-based SMAs as substitutes for NiTi in terms of activation strain of wire during a shape memory cycle, power consumption during actuation, heating and cooling times during actuation, and cost. Furthermore this thesis includes studies on the processing of Cu-based alternatives to enhance shape memory properties of interests, such as transformation temperature and fatigue, and suggests future work to improve Cu-based SMA wires..
by Ashley Hartwell.
S.M.
Munro, Logan. « Investigation of deployable structures and their actuation ». Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/40447.
Texte intégralIncludes bibliographical references (p. 27).
Deployable Structures had not been designed for use in the oil field industry, and additionally have not been designed as devices to perform mechanical work. By analyzing deployable structures a detailed understanding of the mechanism kinematics has been developed. Further, we have analyzed new design concepts of deployable structures that include void filling alterations and snap fit strengthening. The actuation and mechanical loading of the structures and the input to output force ratio were investigated. This understanding was applied to several actuation methods.
by Logan Munro.
S.B.
Ghandi, Kamyar. « Shape memory ceramic actuation of adaptive structures ». Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/49938.
Texte intégralFox, Matthew Edward. « Blade mounted actuation for helicopter rotor control ». Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/49586.
Texte intégralDunn, Christopher Thomas 1971. « Thermoplastic active fiber composites for structural actuation ». Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/16851.
Texte intégralIncludes bibliographical references (v. 2, leaves 267-276).
The integration of piezoelectric actuators into a structure can lead to an active structural surface that can adapt by bending or straining to different operational conditions. This can be used to tune desired properties of the active system to their optimal levels. Due to their fast response time, high bandwidth, and the level of force that the actuator can apply, it has been proposed that monolithic piezoelectric materials be used for active structural control. Monolithic piezoelectric materials for planar actuation have several drawbacks including: (a) use of the lower 3-1 actuation for planar actuation, (b) low strain before failure, (c) inability to conform to curved surfaces. Active Fiber Composites (AFCs) have been developed to address some of these shortcomings of monolithic piezoceramic materials. AFCs are thin composite plies comprised of unidirectional piezoelectric fibers imbedded in a thermoset matrix. An electric field is supplied to the fibers by use of an interdigitated electrode pattern adhered to either side of the AFC. The benefits of AFCs include: the interdigital electrode design uses 3-3 actuation offering increased levels of actuation, AFCs allows for anisotropic planar actuation, the AFCs matrix provides load transfer and load distribution, AFCs allows for coverage of curved shapes. A major drawback of the AFCs with PZT-5A fibers is that the level of actuation is 60% lower than that of the 3-3 actuation of monolithic PZT-5A. This is due primarily to a small layer of low dielectric matrix material that is trapped between the electrodes and the high dielectric fibers during manufacturing.
(cont.) This dielectric mismatch causes a large voltage drop in the matrix thereby reducing actuation. A method that has been developed to reduce this matrix gap, and thus increasing actuation, is to transfer the electrode pattern onto plastic sheets, and heat and press the sheets around the fibers to make Thermoplastic Active Fiber Composites (tmAFCs). tmAFCs also have simpler processing when compared to AFCs and are reshapeable. The focus of this research is to analyze, manufacture, and test tmAFCs to be used in structural control applications with the goal of producing high quality and high performance actuators.
by Christopher T. Dunn.
Ph.D.
Shu, Wenmiao. « Biomolecular sensing and actuation using microcantilever systems ». Thesis, University of Cambridge, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.612828.
Texte intégralTsai, Tsung-Ying, et 蔡宗穎. « Design , Fabrication and Actuation of Thermal Actuating XY-stage for Image Stabilization ». Thesis, 2011. http://ndltd.ncl.edu.tw/handle/77068698764761899459.
Texte intégral國立交通大學
電控工程研究所
99
This research presents a MEMS micro electro - thermal actuating XY-stage fabricated by SOI process, and an image-sensor or a micro-lens can be mounted on this stage. A suitable fabrication process is designed to fabricate the stage in this research. The design-flow, fabrication process and measurements are all shown in the paper. The first step is to survey and set up the specification of the XY-stage. The main goals of this research are smaller device size, lower driving voltage and larger actuating displacement, besides, establishing decoupling function and increasing linearity and controllability are our goals, too. The stiffness, Young’s module, coefficient of thermal expansion and distribution of heat are the important factors which will affect the driving efficiency of the stabilizer, so we will pay most attention on design them. To increase yield, the promotion of fabrication process and design skills are presented in this research.
Yang, Ichieh, et 楊毅杰. « Magnetic Actuating MEMS Display Device ». Thesis, 2006. http://ndltd.ncl.edu.tw/handle/37290132554234254197.
Texte intégralLiao, Chien-An, et 廖健安. « iExoskeleton : Air Muscle Actuating System ». Thesis, 2013. http://ndltd.ncl.edu.tw/handle/49535369604131446697.
Texte intégral國立雲林科技大學
機械工程系碩士班
101
It is an inevitable trend that we are going to become an aging population society in Taiwan. Owing to walking inconvenience in elders, there is an idea starting in our mind of developing iExoskeleton. This essay mainly focuses on development of air muscle actuating system, belonging to the energy source of walking assistant engineering. Air muscle is a newly equipment, working by traction exercise. Our research target is to make it automatic developed ability. 20mm silicone rubber tube is applied in our air muscle, surrounded by PET texture nets outside. The final product also goes through the performance tests, comparing with commercial air muscle as well, and we find the result is satisfying in a positive direction.
Liang, Chia-Lun, et 梁家倫. « Residual Stress Measurement of Actuating Plane in Micromirror ». Thesis, 2004. http://ndltd.ncl.edu.tw/handle/11922249086731964944.
Texte intégral國立中央大學
機械工程研究所
92
Abstract In this study, in order to make the material reaching qualities of strength and toughness, so select aluminum nitride to do the hinge of micromirror actuator. In fabrication produce, to deposition and manufacture the contact holes and hinges by reactive sputtering deposition. By this way can improve the problem of membranes etched by hydrofluoric acid after selectivity tungsten deposition. To adjust deposition power and nitrogen flow rate also can confer the change in characters of aluminum nitride membranes for different nitrogen flow rate, including the thermal stresses, sheet resistances, and hardness that cased by membrane. Furthermore, in order to understand the compose components, and lattice space in aluminum nitride membranes, used the X-ray powder diffractometer to analyze the phase structure in membranes. Employing the lattice space that measured in front and behind of sacrifical layer released, could calculate the residual stress value that cased from membrane, investigating the influences to fabrication process. And we could get that a twenty percent nitrogen flow and 1500 watts plasma power would cause a tensile force in actuating plane material.
Sung, Meng-Ying, et 宋孟瑛. « Application of Piezoelectric-actuating Table in Optical Alignment ». Thesis, 2003. http://ndltd.ncl.edu.tw/handle/02830502649226862464.
Texte intégral國立臺灣科技大學
機械工程系
91
The positioning technique is widely applied in manufacturing, measurement, and machines operating. Currently, the micro-positioner has become an important developing target for achieving the requirement of precision machinery. The piezoelectric actuator has the advantages of ultrahigh precision, high resolution, tiny size and fast response. The main objective of this thesis is to design a controller for piezoelectric actuating x-y table, and then use to establish laser optical alignment system for evaluating the motion control performance and system stability. Since the piezoelectric actuating system has obvious dead-zone offset control voltage and hysteresis nonlinear behaviors, it is difficult to establish a dynamic model for model-based control design. Here, the model free fuzzy control algorithm is employed, and the look ahead control target is chosen for trajectory planning to reduce the chance of trapping into the bang-bang dead zone area. Finally, the implementation technology of optical axis alignment in laser packaging is planned to verify the system performance and stability of this micro positioner. Piezoelectric actuating table brings the photo diode to search the optical axis of a specified laser diode by using a serried of algorithm with precise x-y plane motion control.
Wiggins, Ian David. « Evaluation of an actuating mechanism for the electrical industry ». Thesis, 2012. http://hdl.handle.net/10539/11747.
Texte intégralLi, I.-Han, et 李易翰. « Performance of Thin Valveless One-side Actuating Diaphragm Micropump ». Thesis, 2010. http://ndltd.ncl.edu.tw/handle/12967402816098918965.
Texte intégral國立臺灣大學
機械工程學研究所
98
A novel designed of valveless diaphragm micropump is consisted of chamber, the middle passage, import and export of pipe. By using one-side piezoelectric (PZT) as actuating device, the diaphragm by middle passage will be divided into the active area by direct force from PZT and the passive area affected by the fluid flow. Experimental direction is the gradual enhancement of micropump performance. First, in the light of characteristics of one-side actuating design entrance location and find the reason of flow rate generation. We know that the vibration of diaphragm in passive area is an important role in order to improve the performance of micropump. Take this feature to enlarge the passive area of diaphragm. Later, middle passage width is reduced for micropump flow resistance. Then change the location of PZT fixed end, to confirm the passive area of diaphragm as flow control and flow amplification components. In simulation to see the vibration phenomenon of each node in passive area of diaphragm obtain two key points to achieve high performance in micropump. One is to reduce the distance from diaphragm to the exit, the other is to reduce the number of more large displacement position of the whole diaphragm. Therefore, using high of 0.3 mm, 10 x 10 mm2 size shim placed in the chamber of passive area of diaphragm for verify the simulation. We would get under the 70 Hz the maximum average flow rate 101.5 ml/min, pressure head height 21.3 cm of performance and a wide range of flow rate on the frequency distribution.
Chu, Ren-De, et 褚仁德. « Design and Performance Analysis of Twisted String Actuating System ». Thesis, 2017. http://ndltd.ncl.edu.tw/handle/ugzb4j.
Texte intégral健行科技大學
機械工程系碩士班
105
The advantages of twisted string actuator (TSA) owns light weight, low inertia, high efficiency, low cost and simple mechanism. Due to multiple advantages on TSA, the design of using such actuators are mostly on robotic manipulators, but these features is also suitable for material handling. Thus, the main goal of this thesis is concentrated on deign of the one dimension moving platform based on TSA to meet low cost and simple structure demand request. The driving unit is adapting servo motor with Arduino control board. Moreover, the film potentiometer is using as the position sensor to measure moving platform displacement owing to TSA actuation. The software package LabView2014 is introduced to build the control environment. However, the performance for TSA is influence by the string material properties, hence, this research select six different string to verify their functioning. Consequently, the new measurement model is proposed while modify the positioning equation. Experimental results confirm that such design is reliable and possesses low implementation cost.
Wu, Yuh-Chian, et 吳育騫. « ActiveErgo : Automatic and Personalized Ergonomics using Self-actuating Furniture ». Thesis, 2018. http://ndltd.ncl.edu.tw/handle/y6x6y4.
Texte intégral國立臺灣大學
資訊工程學研究所
106
Proper ergonomics improves productivity and reduces risks for injuries such as tendinosis, tension neck syndrome, and back injuries. Despite having ergonomics standards and guidelines for computer usage since the 1980s, injuries due to poor ergonomics remain widespread. We present ActiveErgo, the first active approach to improving ergonomics by combining sensing and actuation of motorized furniture. It provides automatic and personalized er- gonomics of computer workspaces in accordance to the recommended ergonomics guidelines. Our prototype system uses a Microsoft Kinect sensor for skeletal sensing and monitoring to determine the ideal furniture positions for each user, then uses a combination of automatic adjustment and real-time feedback to adjust the computer monitor, desk, and chair positions. Results from our 12-person user study demonstrated that ActiveErgo significantly improves ergonomics compared to manual configuration in both speed and accuracy, and helps significantly more users to fully meet ergonomics guide- lines.