Dissertations / Theses on the topic 'Shape Memory Alloy Actuators'
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Lafontaine, Serge R. "Fast shape memory alloy actuators." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0004/NQ44482.pdf.
Full textLafontaine, Serge R. "Fast shape memory alloy actuators." Thesis, McGill University, 1997. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=34990.
Full textA new technique is presented to mount nickel-titanium (NiTi) SMA fibers. NiTi alloys are not readily bonded, soldered, brazed or welded to other materials. The new method employs metal deposited on the fiber or between two fibers or between fibers and other parts, creating metallic attachments that are mechanically sound and electrically conductive. Furthermore a new process for the three-dimensional microfabrication by localized electrodeposition and etching has also been developed. This latter process, combined with the first process, can be used to integrate NiTi alloys in micro-mechanisms. The good electrical contacts as well as mechanical contact provided by the new attachment mechanisms are important, since they allow the rapid methods to be employed.
Several apparatus were built to study the response of NiTi fibers, in particular to very fast current pulses. Experimental results were obtained to describe the response of the fibers, such as their speed, hysteresis, stiffness and resistivity, and show how these variables change dynamically as a function of time, temperature and stress. Other measurements important for the design of new actuators were done, such as those of efficiency when fast actuation with large current pulses is used.
In the third part of the thesis a novel application for fast fiber actuators is presented in the form of a fast rotary motor for in-the-wheel car rotary motors.
Prothero, Lori Michelle Gross Robert Steven. "Shape memory alloy robotic truss." Auburn, Ala, 2008. http://repo.lib.auburn.edu/EtdRoot/2008/SUMMER/Aerospace_Engineering/Thesis/Prothero_Lori_16.pdf.
Full textSoares, Alcimar Barbosa. "Shape memory alloy actuators for upper limb prostheses." Thesis, University of Edinburgh, 1997. http://hdl.handle.net/1842/21541.
Full textGrant, Danny. "Accurate and rapid control of shape memory alloy actuators." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0020/NQ55336.pdf.
Full textLederlé, Stéphane 1978. "Issues in the design of shape memory alloy actuators." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/16830.
Full text"June 2002."
Includes bibliographical references (p. 93-96).
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
This thesis considers the application of shape memory alloy (SMA) actuators for shape control of the undertray of a sports car. By deforming the shape of the structure that provides aerodynamic stability to the car, we expect to improve the overall performance of the vehicle by adapting its aerodynamics according to the vehicle speed. We then develop a methodology for designing SMA actuators in this application. The methodology is based on the integration of the different models involved: mechanical, thermal, and electrical. The constraints imposed on the device are also incorporated. Unfortunately, the analysis predicts an actuation time that is too slow for this particular application. Still, we use our assembled model to sketch the expected characteristics of SMA actuators. A significant result is that the actuation time is a function of the amount of energy the active material has to provide, and that there is a necessary trade-off between the mass of actuators and the actuation time. In particular, the expected energy density may have to be decreased to achieve acceptable actuation times. Finally, we propose a way to estimate a priori the suitability of SMA actuators for a particular application.
by Stéphane Lederlé.
S.M.
Kumar, Guhan. "Modeling and design of one dimensional shape memory alloy actuators." Connect to resource, 2000. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1116879145.
Full textBecker, Marcus Patrick. "Thermomechanical training and characterization of shape memory alloy axial actuators." Thesis, Montana State University, 2010. http://etd.lib.montana.edu/etd/2010/becker/BeckerM0510.pdf.
Full textNakamura, Mealani 1978. "A torso haptic display based on shape memory alloy actuators." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/89927.
Full textChambers, Joshua Michael. "Design and characterization of acoustic pulse shape memory alloy actuators." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/32378.
Full textIncludes bibliographical references (p. 175-177).
Single crystal Ni-Mn-Ga ferromagnetic shape memory alloys (FSMAs) are active materials which produce strain when a magnetic field is applied. The large saturation strain (6%) of Ni-Mn-Ga, and material energy density comparable to piezoelectric ceramics make Ni- Mn-Ga an interesting active material. However, their usefulness is limited by the bulky electromagnet required to produce a magnetic field. In this thesis, a novel actuation method is developed for shape memory alloys in their martensitic phase, whereby asymmetric acoustic pulses are used to drive twin boundary motion. Experimental actuators were developed using a combination of Ni-Mn-Ga FSMA single crystals and a piezoelectric stack actuator. In bi-directional actuation without load, strains of over 3% were achieved using repeated pulses (at 100 Hz) over a 30 s interval, while 1% strain was achieved in under 1 s. The maximum strains achieved are comparable to the strains achieved using bi-directional magnetic actuation, although the time required for actuation is longer. No-load actuation also showed a nearly linear relationship between the magnitude of the asymmetric stress pulse and the strain achieved during actuation, and a positive correlation between pulse repetition rate and output strain rate, up to at least 100 Hz. Acoustic actuation against a spring load showed a maximum output energy density for the actuator of about 1000 J/m³, with a peak-to-peak stress and strain of 100 kPa and 2%, respectively.
by Joshua Michael Chambers.
S.M.
Liang, Yuanchang. "Design principle of actuators based on ferromagnetic shape memory alloy /." Thesis, Connect to this title online; UW restricted, 2002. http://hdl.handle.net/1773/7072.
Full textGiles, Adam R. "Deflection and shape change of smart composite laminates using shape memory alloy actuators." Thesis, Loughborough University, 2005. https://dspace.lboro.ac.uk/2134/7698.
Full textPardon, Gaspard. "A feasibility Study of SMA Powder Composite Actuators." Thesis, KTH, Mikrosystemteknik, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-91283.
Full textFrautschi, Jason Paul. "Finite Element Simulations of Shape Memory Alloy Actuators in Adaptive Structures." NCSU, 2003. http://www.lib.ncsu.edu/theses/available/etd-03302003-174528/.
Full textRosmarin, Josiah Benjamin. "Design of a humanoid hand using segmented shape memory alloy actuators." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/36706.
Full textIncludes bibliographical references (leaf 48).
Despite amazing progress in the past two decades, the field of robotics has yet to produce a robotic hand with the same dexterity as the human hand. There has yet to even be a functioning robotic hand of the same size and weight as the human hand. These deficiencies can be attributed to the size, weight and complexity of the actuators used in these robotic hands. Thermal shape memory alloys (SMA's) have characteristics such as high power density which indicate that they would be ideal actuators for such applications. However, certain characteristics of SMA exist which, if left unaddressed, make usage as an actuator impractical. The implementation of SMA for the actuation of a 20 degree of freedom robotic hand and forearm is investigated. A segmented actuation design for the SMA is implemented to address issues of practicality; other issues with regards to the controllability, response time and limited strain of the SMA are addressed. A 20 degree of freedom robotic hand with 16 controlled axes is designed along with a 32 axis actuator box. The designs are realized and the result is a functioning robotic hand of similar size and weight to the human hand. It is concluded that thermal shape memory alloys are a viable solution for the purposes of compact lightweight actuation of vast degree of freedom systems.
by Josiah Benjamin Rosmarin.
S.B.
Couch, Ronald Newton. "Development of magnetic shape memory alloy actuators for a swashplateless helicopter rotor." College Park, Md. : University of Maryland, 2006. http://hdl.handle.net/1903/3526.
Full textThesis research directed by: Aerospace Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
Turner, Travis Lee. "Thermomechanical Response of Shape Memory Alloy Hybrid Composites." Diss., Virginia Tech, 2000. http://hdl.handle.net/10919/29771.
Full textPh. D.
Paine, Jeffrey Steven Nelson. "The performance of nitinol shape memory alloy actuators embedded in thermoplastic composite material systems /." This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-10102009-020117/.
Full textSantiago, Anadón José R. "Large force shape memory alloy linear actuator." [Gainesville, Fla.] : University of Florida, 2002. http://purl.fcla.edu/fcla/etd/UFE1001179.
Full textStebner, Aaron P. "Development, Characterization, and Application of Ni19.5Ti50.5Pd25Pt5 High-Temperature Shape Memory Alloy Helical Actuators." Akron, OH : University of Akron, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=akron1194994008.
Full text"December, 2007." Title from electronic thesis title page (viewed 02/22/2008) Advisor, D. Dane Quinn; Co-Advisor, Graham Kelly; Department Chair, Celal Batur; Dean of the College, George K. Haritos; Dean of the Graduate School, George R. Newkome. Includes bibliographical references.
Lemanski, Jennifer. "CRYOGENIC SHAPE MEMORY ALLOY ACTUATORS FOR SPACEPORT TECHNOLOGIES: MATERIALS CHARACTERIZATION AND PROTOTYPE TESTING." Master's thesis, University of Central Florida, 2005. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2779.
Full textM.S.M.S.E.
Department of Mechanical, Materials and Aerospace Engineering;
Engineering and Computer Science
Materials Science and Engineering
Nicholson, Douglas E. "Thermomechanical behavior of high-temperature shape memory alloy Ni-Ti-Pd-Pt actuators." Master's thesis, University of Central Florida, 2011. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4814.
Full textID: 030646204; System requirements: World Wide Web browser and PDF reader.; Mode of access: World Wide Web.; Thesis (M.S.A.E.)--University of Central Florida, 2011.; Includes bibliographical references (p. 102-106).
M.S.A.E.
Masters
Mechanical and Aerospace Engineering
Engineering and Computer Science
Aerospace Engineering; Space System Design and Engineering Track
Daverman, R. Dodge (Robert Dodge). "A novel binary actuator using shape memory alloy." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/32363.
Full textIncludes bibliographical references (p. 95-96).
In situations that demand the use of the high-bandwidth, high-quality sense of vision for interactions with the physical world it would be beneficial to have a wearable tactile display that takes advantage of touch to communicate information to the user without causing visual distractions. This thesis presents the design and development of a novel actuator that can be configured into thin, flexible arrays to meet this need for wearable tactile displays. The actuator presented uses the strain recovery property of the martensitic transformation of Nitinol, a Shape Memory Alloy (SMA), to generate the actuation force. A compliant bistable mechanism provides the restoring force that pre- strains the martensitic Nitinol, and thus makes the actuator binary. Binary actuation alleviates some of the problems that would otherwise limit the effectiveness of Nitinol in wearable haptic systems. To increase the potential for commercial success, manufacturability issues are considered throughout the development cycle to ensure the potential for economical large scale production. The paper concludes with the presentation of three different prototypes. Their successes and failures are discussed along with recommendations for future work.
by R. Dodge Daverman.
S.M.
Buban, Darrick Matthew. "Shape Memory Alloy Fracture as a Deployment Actuator." Diss., The University of Arizona, 2013. http://hdl.handle.net/10150/283604.
Full textFox, Gordon. "Development of a characterization instrument for thermomechanical testing of shape memory alloy torque actuators." Connect to resource, 2010. http://hdl.handle.net/1811/45418.
Full textLu, Xuemei. "A systems approach to modelling and design of high strain shape memory alloy actuators." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ37267.pdf.
Full textLu, Xuemei 1970. "A systems approach to modelling and design of high strain shape memory alloy actuators /." Thesis, McGill University, 1997. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=28000.
Full textA new concept of designing shape memory alloy bending actuator is presented in the end of the thesis. Part of the modelling work is accomplished in this research by developing a software simulator which is capable of predicting the geometric transformation of the actuator during bending. As a result, the dynamic strain of each SMA fiber in the actuator can be computed given a bending axis and angle. Graphical display of the bending transformation is implemented using in house software package. Further investigation of modelling and control of the SMA bending actuator is left as future work.
Paine, Jeffrey S. "The performance of nitinol shape memory alloy actuators embedded in thermoplastic composite material systems." Thesis, Virginia Tech, 1991. http://hdl.handle.net/10919/45109.
Full textMaster of Science
Toews, Leslie Marilyn. "The Development of a Monolithic Shape Memory Alloy Actuator." Thesis, University of Waterloo, 2004. http://hdl.handle.net/10012/871.
Full textChun, Katherine S. (Katherine Shisuka). "Shape memory alloy rotary actuator for CubeSat deployable structures." Thesis, Massachusetts Institute of Technology, 2020. https://hdl.handle.net/1721.1/127066.
Full textCataloged from the official PDF of thesis.
Includes bibliographical references (pages 77-82).
Small satellites have lowered the barrier to entry for space-bound science and technology demonstrations. However, the small form factor requires extremely low size, weight, and power for any on-board hardware. Precision actuation of deployable structures has previously been achievable only through low SWaP single-use actuators or motor-driven, high SWaP multiple-use actuators. The Folded Lightweight Actuated Positioning System has the potential to provide an ultra-lightweight multiple-use actuator by using a Joule-heated shape memory alloy-based hinge. The hinge uses two shape memory alloy strips which are trained in opposite directions and mounted into a rotary actuator. Two different shape memory alloy geometries are explored: a rectangular cross-section and a circular cross-section. The rectangular hinge actuates over a range of ±20° with an average power of 0.14 W. The circular hinge actuates over a range of ±23° with an average power of 0.073 W. A closed-loop controller uses pulse width modulation and encoder measurements to actuate the rectangular hinge to within 2' of the desired angle.
by Katherine S. Chun.
S.M.
S.M. Massachusetts Institute of Technology, Department of Aeronautics and Astronautics
Souri, Mohammad. "FINITE ELEMENT MODELING AND FABRICATION OF AN SMA-SMP SHAPE MEMORY COMPOSITE ACTUATOR." UKnowledge, 2014. http://uknowledge.uky.edu/me_etds/38.
Full textMohamed, Ali Mohamed Sultan. "Integration and wireless control methods for micromachined shape-memory-alloy actuators and their MEMS applications." Thesis, University of British Columbia, 2012. http://hdl.handle.net/2429/42820.
Full textOtieno, Timothy. "Shape memory Alloy Actuator for cross-feed in turning operation." Thesis, Nelson Mandela Metropolitan University, 2012. http://hdl.handle.net/10948/d1012590.
Full textSoylemez, Burcu. "Design And Analysis Of A Linear Shape Memory Alloy Actuator." Phd thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/12610340/index.pdf.
Full textBiTAK-SAGE as well as certification test equipments. The development of shape memory alloy actuators that can be used in defense and later in aeronautical/space applications is a critical research and development project for national defense industry.
Khatsenko, Maxim O. "A rotary shape memory alloy actuator for CubeSat deployable structures." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/111751.
Full textCataloged from PDF version of thesis.
Includes bibliographical references (pages 155-158).
Over a decade of continuing CubeSat technology improvements are driving the wide adoption of CubeSats for research and commercial missions. Resource constraints onboard CubeSats still limit their ability to support multi-use actuators, but there is a need for a rotary CubeSat actuator that can be actively commanded to different angles. This type of actuator can be implemented in a CubeSat mechanism for differential drag management, increased power generation, and reconfigurable deployable structures. We propose using a shape memory alloy (SMA) actuator to meet this need. A SMA can be annealed at high temperatures to remember a trained shape. Upon cool down, the SMA element transforms to the martensite phase and is easily deformed. When the element is heated above the transformation temperature it transforms to the stiff austenite phase and assumes its remembered shape, driving the mechanism. Two SMA actuators are trained to different shapes and provide bidirectional rotary motion for use as a space mechanism. The actuators are designed by implementing kinematic, thermal, and bending models to size the SMA element. The models also predict the performance, size, weight, and power of the actuator and ensure it can operate in the CubeSat environment. Then, a prototype of the proposed actuator is manufactured, assembled, and ground tested. Testing is used to validate the models and verify the requirements necessary to operate onboard a CubeSat. The prototype meets all requirements and offers a reduced mass, volume, and complexity alternative to current CubeSat electromagnetic actuators. Future work is necessary to improve the mechanical performance and positional control of the SMA actuator.
by Maxim O. Khatsenko.
S.M.
Hegana, Ashenafi B. "Low Temperature Waste Energy Harvesting by Shape Memory Alloy Actuator." University of Akron / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=akron1461631046.
Full textHuang, Weimin. "Shape memory alloys and their application to actuators for deployable structures." Thesis, University of Cambridge, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.299009.
Full textHan, L. "Shape memory alloys : numerical simulation and optimal design of SMA actuators." Thesis, University of Cambridge, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.603638.
Full textWilliams, Eric Andrew. "The Development of Actuators for the Whole Skin Locomotion Robot." Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/46786.
Full textPh. D.
Lenahan, Kristie M. "Thermoelastic control of adaptive composites for aerospace applications using embedded nitinol actuators." Thesis, Virginia Tech, 1996. http://hdl.handle.net/10919/44955.
Full textAerospace structures have stringent pointing and shape control requirements during long-term exposure to a hostile environment with no scheduled maintenance. This makes them excellent candidates for a smart structures approach as current passive techniques prove insufficient. This study investigates the feasibility of providing autonomous dimensional control to aerospace structures by embedding shape memory alloy elements inside composite structures. Increasing volume fractions of nitinol wire were embedded in cross-ply graphite/ epoxy composite panels. The potential of this approach was evaluated by measuring the change in longitudinal strain with increasing temperature and volume fraction. Reduction of thermal expansion is demonstrated and related to embedded volume fraction.
Classical lamination theory is used to formulate a two-dimensional model which
included the adaptive properties of the embedded nitinol. The model was used to predict
the increased modulus and reduction of thermal strain in the modified plates which was
verified by the experimental data.
Master of Science
Kianzad, Soheil. "A treatise on highly twisted artificial muscle : thermally driven shape memory alloy yarn and coiled nylon actuators." Thesis, University of British Columbia, 2015. http://hdl.handle.net/2429/54782.
Full textApplied Science, Faculty of
Electrical and Computer Engineering, Department of
Graduate
Krishnan, Vinu Bala. "Low temperature NiTiFe shape memory alloys actuator engineering and investigation of deformation mechanisms using in situ neutron diffraction at Los Alamos National Laboratory /." Orlando, Fla. : University of Central Florida, 2007. http://purl.fcla.edu/fcla/etd/CFE0001934.
Full textHo, Eric. "Linear Macro-Micro Positioning System Using a Shape Memory Alloy Actuator." Thesis, University of Waterloo, 2004. http://hdl.handle.net/10012/816.
Full textGrant, Danny. "Shape memory alloy actuator with an application to a robotic eye." Thesis, McGill University, 1995. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=22650.
Full textFurther, a camera platform was constructed as an application for the actuators. The camera platform prototype orients a small CCD camera head, that supplies data to a foveated vision system. The three degrees of freedom pan, tilt, and torsion, are realized by four actuators in an antagonistic fashion. The camera support was manufactured using light weight plastic, including the use of plastic hinges to reduce the use of weighty bearings.
Control of the actuators is accomplished via a two stage switching feedback law that has its basis in sliding mode control theory. Essentially, the controller switches according to the sign of the error choosing which actuator is agonist and which is the antagonist.
Avirovik, Dragan. "System Level Approach towards Intelligent Healthcare Environment." Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/49581.
Full textPh. D.
Motzki, Paul [Verfasser], and Stefan [Akademischer Betreuer] Seelecke. "Advanced design and control concepts for actuators based on shape memory alloy wires / Paul Motzki ; Betreuer: Stefan Seelecke." Saarbrücken : Saarländische Universitäts- und Landesbibliothek, 2018. http://d-nb.info/1169132502/34.
Full textMotzki, Paul Verfasser], and Stefan [Akademischer Betreuer] [Seelecke. "Advanced design and control concepts for actuators based on shape memory alloy wires / Paul Motzki ; Betreuer: Stefan Seelecke." Saarbrücken : Saarländische Universitäts- und Landesbibliothek, 2018. http://d-nb.info/1169132502/34.
Full textNarayanan, Pavanesh. "Sensor-less Control of Shape Memory Alloy Using Artificial Neural Network and Variable Structure Controller." University of Toledo / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1416501021.
Full textSaal, Sheldon C. "The development of an active surface using shape memory alloys." Thesis, Cape Peninsula University of Technology, 2006. http://hdl.handle.net/20.500.11838/1292.
Full textRecent years have witnessed a tremendous growth and significant advances in “smart” composites and “smart” composite structures. These smart composites integrate active elements such as sensors and actuators into a host structure to create improved or new functionalities through a clever choice of the active elements and/or a proper design of the structure. Such composites are able to sense a change in the environment and make a useful response by using an external feedback control system. Depending on their applications, smart composites usually make use of either the joint properties of the structure or the properties of the individual elements within the composites. The accumulation in the understanding of materials science and the rapid developments in computational capabilities have provided an even wider framework for the implementation of multi-functionality in composites and make “smart” composites “intelligent”.
Jun, Hyoung Yoll. "Development of a fuel-powered compact SMA (Shape Memory Alloy) actuator system." Diss., Texas A&M University, 2003. http://hdl.handle.net/1969.1/1426.
Full text