Relevant bibliographies by topics / Shape Memory Alloy Actuators

Academic literature on the topic 'Shape Memory Alloy Actuators'

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Published: 4 June 2021
Last updated: 6 September 2023

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Journal articles on the topic "Shape Memory Alloy Actuators"

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Yuan, Han, Jean–Christophe Fauroux, Frédéric Chapelle, and Xavier Balandraud. "A review of rotary actuators based on shape memory alloys." Journal of Intelligent Material Systems and Structures 28, no. 14 (January 9, 2017): 1863–85. http://dx.doi.org/10.1177/1045389x16682848.

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The development of rotary actuators is an important aspect of the engineering applications of shape memory alloys. This article reviews about a hundred references on this topic, and presents around eighty actuators driven by shape memory alloys. A classification is made according to the type of rotation (continuous or non-continuous, single or reversible direction). Different factors are then discussed, such as the characteristics of the shape memory alloy elements, the heating and cooling system for the shape memory alloy, the control of the actuator, and the output torque and stroke which can be attained. This article provides the first review focused on rotary actuators triggered by shape memory alloys, highlighting the specificities and potentialities of such actuators for new applications in the future.
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Ostertag, Oskar, and Eva Ostertagová. "Shape Memory Alloy Actuator (SMA)." Applied Mechanics and Materials 816 (November 2015): 9–15. http://dx.doi.org/10.4028/www.scientific.net/amm.816.9.

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Our article deals with the possibility of using shape memory material (SMA − Shape Memory Alloy) to create an actuator of the mechanical element. The biggest advantage of the SMA actuators compared to those made of conventional materials is that they have the ability to generate relatively great force, are of low weight and small size.
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Karimi, Saeed, and Bardia Konh. "Self-sensing feedback control of multiple interacting shape memory alloy actuators in a 3D steerable active needle." Journal of Intelligent Material Systems and Structures 31, no. 12 (June 3, 2020): 1524–40. http://dx.doi.org/10.1177/1045389x20919971.

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Percutaneous needle-based intervention is a technique used in minimally invasive surgical procedures such as brachytherapy, thermal ablation, and biopsy. Targeting accuracy in these procedures is a defining factor for success. Active needle steering introduces the potential to increase the targeting accuracy in such procedures to improve the clinical outcome. In this work, a novel 3D steerable active flexible needle with shape memory alloy actuators was developed. Active needle actuation response to a variety of actuation scenarios was analyzed to develop a kinematic model. Shape memory alloy actuators were characterized in terms of their actuation strain, electrical resistance, and required electrical power to design a self-sensing electrical resistance feedback control system for position tracking control of the active needle. The control system performance was initially tested in position tracking control of a single shape memory alloy actuator and then was implemented on multiple interacting shape memory alloy actuators to manipulate the 3D steerable active needle along a reference path. The electrical resistance feedback control of the multiple interacting shape memory alloy actuators enabled the active needle to reach target points in a planar workspace of about 20 mm. Results demonstrated shape memory alloys as promising alternatives for traditional actuators used in surgical instruments with enhanced design, characterization, and control capabilities.
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Rączka, Waldemar, Jarosław Konieczny, Marek Sibielak, and Janusz Kowal. "Discrete Preisach Model of a Shape Memory Alloy Actuator." Solid State Phenomena 248 (March 2016): 227–34. http://dx.doi.org/10.4028/www.scientific.net/ssp.248.227.

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Shape Memory Alloy is a material used to designing actuators. These actuators have many advantages. They are light, strong and silent. They are building in laboratory and tested because beside advantages they have disadvantages too. SMA actuators have nonlinear characteristics with hysteresis loop.In the first part of the paper Shape Memory Alloys are shortly described. Next mathematical model was formulated. In the paper the Preisach model was developed. Discrete form of the model was considered and implemented. After parameter identification model was implemented in LabView. Tests of the model were conducted and results were worked. Obtained characteristics of the SMA actuator are shown in the paper. At the end of the paper the conclusions were formulated.
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Liang, C., and C. A. Rogers. "Design of Shape Memory Alloy Actuators." Journal of Mechanical Design 114, no. 2 (June 1, 1992): 223–30. http://dx.doi.org/10.1115/1.2916935.

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This paper describes the design of shape memory alloy force and displacement actuators based upon the thermomechanical constitutive relations previously developed by the authors. Numerical simulations and design case studies are presented which show the utility and advantages of this method over design methods currently being used. The types of actuators described and analyzed include bias spring actuators, differential force actuators, and their hybrid systems. The design approach includes coupling between the one-dimensional thermomechanical constitutive relations and a lumped capacitance transient thermal analysis. The design approach described herein will provide a practical and convenient method for use in the design of shape memory alloy actuators.
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Copaci, Dorin, Dolores Blanco, and Luis E. Moreno. "Flexible Shape-Memory Alloy-Based Actuator: Mechanical Design Optimization According to Application." Actuators 8, no. 3 (August 14, 2019): 63. http://dx.doi.org/10.3390/act8030063.

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New robotic applications, among others, in medical and related fields, have in recent years boosted research in the development of new actuators in the search for solutions that are lighter and more flexible than conventional actuators. Shape-Memory Alloy (SMA)-based actuators present characteristics that make them an excellent alternative in a wide variety of applications. This paper presents the design, tests (with the control description) and analysis of various configurations of actuators based on SMA wires: flexible SMA actuators, different mechanical design to multiply the displacement and different configurations for actuators with multiple SMA wires. The performance of the actuators has been analyzed using wires of different activation temperatures. The influence of the Bowden sheath of the flexible actuator has been tested, as has the thermal behavior of actuators with several wires. This work has allowed determination of the most effective configuration for the development of a flexible actuator based on SMA, from the point of view of dimensions, efficiency, and work frequency. This type of actuator has been applied in the development of soft robots and light robotic exoskeletons.
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Bolocan, Vlad Marius, Dragoș Dumitru Vâlsan, Andrei Novac, Gheorghe Amadeus Chilnicean, Aurel Ercuța, and Corneliu Marius Crăciunescu. "Design of Shape Memory Micro-Actuator Modules with Sequential Actuation." Solid State Phenomena 332 (May 30, 2022): 67–72. http://dx.doi.org/10.4028/p-14r0v3.

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Shape memory alloy film-based micro-actuators have their behaviour controlled by a change in the thermomechanical stress that occurs in the bimorph - shape memory alloy film plus substrate assembly. The modification of the composition of the shape memory alloy leads to a change of the transformation temperature and implicitly of the temperature at which the stress change takes place in the bimorph. The design of micro-actuator blocks in which the composition and/or the temperature control mode of each micro-actuator in the block allows to obtain successive or sequential transformation sequences. The paper analyses the case of cantilever actuator modules with films of different compositions, deposited on the same substrate. It is highlighted how the composition of the alloy film with shape memory influences the modification of the curvature of bimorph cantilever type actuators in the studied block.
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Le, Tien Sy, Holger Schlegel, Welf Guntram Drossel, and Andreas Hirsch. "Antagonistic Shape Memory Alloy Actuators in Soft Robotics." Solid State Phenomena 251 (July 2016): 126–32. http://dx.doi.org/10.4028/www.scientific.net/ssp.251.126.

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The paper presents research concerning the utilization of shape memory alloys in terms of an antagonistic actuator system. The main focus is to determine arrangements for the necessary movements and also to evaluate a suitable control methodology. Most use cases of soft robotics can be accomplished by either linear actuators (cf. earthworm), circular actuators (cf. brachial joint) or a combination of both. Hence, for the research, those two scenarios were taken into account. The paper describes the used simulation model, which bases on a thermo-mechanical submodel of a single SMA actuator. It complements interconnections of physical parameters like temperature, percentage of martensite, elongation and tension. Furthermore, it is shown, how the submodels are connected in a suitable way to establish the required use cases.The position control of either the transversal position or the angle is realized by a PID or PI controller. The paper also shows the impact of parameter changes in the SMA on the achievable position accuracy. Also different strategies for controller design will be discussed.
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Liu, Bingfei, Qingfei Wang, Shilong Hu, Wei Zhang, and Chunzhi Du. "On thermomechanical behaviors of the functional graded shape memory alloy composite for jet engine chevron." Journal of Intelligent Material Systems and Structures 29, no. 14 (June 13, 2018): 2986–3005. http://dx.doi.org/10.1177/1045389x18781257.

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This study presents a theoretical work for a novel adaptive jet engine chevron concept based upon embedding the functionally graded shape memory alloy actuators in a composite laminate, termed a functionally graded shape memory alloy actuator composite. The constitutive models of the functionally graded shape memory alloy actuator composites including the monolayer shape memory alloy composites and multilayer shape memory alloy composites with different volume fractions of the shape memory alloy were first given. An example using such models was discussed on a published finite element work on a shape memory alloy hybrid composite jet engine chevron concept to prove the validity of the theoretical work. The thermomechanical behaviors of the functionally graded shape memory alloy actuator composite with different volume fractions of the shape memory alloy subjected to the thermal loading were then discussed using the obtained constitutive model. The tip deflections of the jet engine chevron with different embedding patterns of the shape memory alloy were finally obtained.
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Ashir, Moniruddoza, Andreas Nocke, and Chokri Cherif. "Development of Actuator Networks by Means of Diagonal Arrangements of Shape Memory Alloys in Adaptive Fiber-Reinforced Plastics." Solid State Phenomena 333 (June 10, 2022): 47–53. http://dx.doi.org/10.4028/p-zq8hvx.

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Adaptive fiber-reinforced plastics (FRP) contain actuators that enable the controlled modification of system states and characteristics. The textile-technical integration of actuators, in particular shape memory alloys, into reinforcing fabrics has increasingly been applied in recent years. The objective is to achieve optimum force transmission from shape memory alloy to FRP, long-term stability of adaptive FRP as well as a maximum degree of deformation. This paper presents the development of actuator networks for adaptive FRP, where two shape memory alloys are integrated into reinforcing fabrics by means of open reed weaving technology. After infusion of the functionalized reinforcing fabrics, the deformation behavior of adaptive FRP was characterized with variable actuator switching frequencies (≥ 1 Hz) or actuator activation times (≤ 1 s).
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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.

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Lafontaine, 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.

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In this thesis techniques for fabricating fast contracting and relaxing shape memory alloy (SMA) fibers are presented. Shape memory alloy fibers have demonstrated the largest stress and highest power to mass ratio of any known actuator technology. However their practical application has been plagued by three major drawbacks, namely: (1) relatively slow expansion of the material despite rapid contraction; (2) problems of mechanically and electrically connecting to the material due to the violent nature of their contractions; and (3) low efficiency in the conversion of electrical energy or heat into mechanical energy. The work associated with this thesis has led to solutions to the first two problems allowing even sub-millisecond contraction-expansion cycle times, and fibers to be attached via light weight but high strength and high conductivity joints. The properties of these fibers are extensively studied. Both linear and rotary actuators are built using these fibers.
A 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.
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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.

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Soares, Alcimar Barbosa. "Shape memory alloy actuators for upper limb prostheses." Thesis, University of Edinburgh, 1997. http://hdl.handle.net/1842/21541.

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Despite the technological advances of the twentieth century, we are not yet able to produce artificial limbs which "mimic" perfectly their natural counterparts. In general, artificial limbs are not as dextrous as human limbs, the control is unnatural and there is no proper feedback by which the user can assess the status of the prosthesis. In this thesis the problems related to upper-limb prostheses are considered. The use of a special material known as Shape Memory Alloy (SMA) is investigated towards producing improved joint actuators for small artificial prostheses such as those required by young children. SMA actuators can be very lightweight, their motion is silent and smooth and yet they are capable of delivering considerable power per unit of weight. The Shape Memory phenomenon and the many challenges involved in its application are discussed. The detailed design of an SMA joint actuator for a hand mechanism in an above-elbow prosthesis for young children is given. To assist the design and construction of both the artificial hand and the actuator, a mathematical model was developed and incorporated in a computer program simulating the forces and movements within the hand. The model was used to optimise the hand mechanism and specify the required joint actuator. Suitable SMA elements were identified through laboratory tests. The hand mechanism was constructed and the actuator, control systems and power source were attached to it. Tests were performed to investigate the characteristics of the complete device. The results show that, although SMA actuators must be designed and used with great care, they do offer a viable and more natural alternative to conventional actuators such as pneumatic devices and electric motors in certain applications.
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Grant, 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.

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Lederlé, Stéphane 1978. "Issues in the design of shape memory alloy actuators." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/16830.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2002.
"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.
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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.

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Becker, 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.

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Although considerable work has been performed to understand the key mechanisms of Shape Memory Alloy (SMA) behavior, little of this work follows a standard testing protocol, quantifies a conditioning methodology, or develops data appropriate for design of SMA actuators. One major issue that limits the ability of the material from being used directly as an actuator is the large, non-recoverable strains likely to accrue in the material during each training cycle, mechanical or thermal. When mechanical or thermal cycling is performed, a hysteresis curve develops and reaches a steady state strain recovery response. At the point where permanent plastic strain stops growing, or saturates, the SMA has been successfully trained. The focus of this work is oriented toward SMAs in general, but all testing and experimentation was carried out on Nickel-Titanium (NiTi) alloys. The experimentation and testing was performed on a combination of 4 different sizes and 3 different NiTi alloy compositions. Thermomechanical testing was performed to determine critical values to describe the stress-temperature phase space of the materials and parameters to model the applied stress and transformation strain relationship. All material size and alloy combinations were tested in the as-received, or as-machined, and fully annealed state. The results of the training and actuation strain characterization process developed in this work shows that the samples that experienced Transformation Induced Plasticity (TRIP), greater than 2% during the training process and exhibit Two-Way Shape Memory (TWSM) after being fully trained, share a very similar applied stress versus transformation strain curve. This curve is modeled by the Back Stress formulation derived from the Gibbs Free Energy constitutive model by Bo & Lagoudas. The design space created by the Back Stress formulation, recrystallization temperature, and training stress allows SMA materials to be characterized and implemented as stable 1-D actuators. This research formalized a thermomechanical training and characterization method for uniaxial SMA actuators by addressing the interaction between processing, recoverable and non-recoverable deformation. Using various sizes and NiTi alloy combinations, this research develops and evaluates a method to train and characterize a diverse range of SMAs through a set of thermomechanical and physical property measurements.
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Nakamura, 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.

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Chambers, 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.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2005.
Includes 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.
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Books on the topic "Shape Memory Alloy Actuators"

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Elahinia, Mohammad H. Shape Memory Alloy Actuators. Chichester, UK: John Wiley & Sons, Ltd, 2015. http://dx.doi.org/10.1002/9781118426913.

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Rao, Ashwin, A. R. Srinivasa, and J. N. Reddy. Design of Shape Memory Alloy (SMA) Actuators. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-03188-0.

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Shape memory alloy actuators: Design, fabrication, and experimental evaluation. Chichester, West Sussex: John Wiley and Sons, Inc., 2015.

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Center, Langley Research, ed. Thermomechanical response of shape memory alloy hybrid composites. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 2001.

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D, Armstrong William, Society of Photo-optical Instrumentation Engineers., American Society of Mechanical Engineers., and Intelligent Materials Forum (Mitō Kagaku Gijutsu Kyōkai), eds. Smart structures and materials 2005.: 7-10 March, 2005, San Diego, California, USA. Bellingham, Wash: SPIE, 2005.

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Aerospace, Mechanisms Symposium (31st 1997 Huntsville Ala ). 31st Aerospace Mechanisms Symposium: Proceedings of a symposium held at the Huntsville Marriott, Huntsville, Alabama and hosted by NASA, George C. Marshall Space Flight Center and sponsored by Lockheed Martin Missiles and Space and the Aerospace Mechanisms Symposium Committee, May 14-16, 1997. MSFC, Ala: National Aeronautics and Space Administration, Marshall Space Flight Center, 1997.

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Czechowicz, Alexander, and Sven Langbein, eds. Shape Memory Alloy Valves. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-19081-5.

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C, Lagoudas Dimitris, Society of Photo-optical Instrumentation Engineers., American Institute of Aeronautics and Astronautics., and United States. Defense Advanced Research Projects Agency., eds. Smart structures and materials 2004.: 15-18 March, 2004, San Diego, California, USA. Bellingham, Wash: SPIE, 2004.

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C, Lagoudas Dimitris, Society of Photo-optical Instrumentation Engineers., American Society of Mechanical Engineers., and United States. Air Force. Office of Scientific Research., eds. Smart structures and materials 2003.: 3-6 March, 2003, San Diego, California, USA. Bellingham, Wash: SPIE, 2003.

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International, Symposium on Shape Memory Alloys (1986 Guilin China). Shape memory alloy' 86': Proceedings of the International Symposium on Shape Memory Alloys, September 6-9, 1986, Guilin, China. Beijing: China Academic Publishers, 1986.

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Book chapters on the topic "Shape Memory Alloy Actuators"

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Ashrafiuon, Hashem, and Mohammad H. Elahinia. "Control of SMA Actuators." In Shape Memory Alloy Actuators, 125–54. Chichester, UK: John Wiley & Sons, Ltd, 2015. http://dx.doi.org/10.1002/9781118426913.ch4.

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Haberland, Christoph, Mahmoud Kadkhodaei, and Mohammad H. Elahinia. "Introduction." In Shape Memory Alloy Actuators, 1–43. Chichester, UK: John Wiley & Sons, Ltd, 2015. http://dx.doi.org/10.1002/9781118426913.ch1.

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Mirzaeifar, Reza, and Mohammad H. Elahinia. "Mathematical Modeling and Simulation." In Shape Memory Alloy Actuators, 45–83. Chichester, UK: John Wiley & Sons, Ltd, 2015. http://dx.doi.org/10.1002/9781118426913.ch2.

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Andani, Masood Taheri, Francesco Bucchi, and Mohammad H. Elahinia. "SMA Actuation Mechanisms." In Shape Memory Alloy Actuators, 85–123. Chichester, UK: John Wiley & Sons, Ltd, 2015. http://dx.doi.org/10.1002/9781118426913.ch3.

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Mahtabi, Mohammad J., Nima Shamsaei, and Mohammad H. Elahinia. "Fatigue of Shape Memory Alloys." In Shape Memory Alloy Actuators, 155–90. Chichester, UK: John Wiley & Sons, Ltd, 2015. http://dx.doi.org/10.1002/9781118426913.ch5.

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Haberland, Christoph, and Mohammad H. Elahinia. "Fabricating NiTi SMA Components." In Shape Memory Alloy Actuators, 191–238. Chichester, UK: John Wiley & Sons, Ltd, 2015. http://dx.doi.org/10.1002/9781118426913.ch6.

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Turabi, Ali S., Soheil Saedi, Sayed Mohammad Saghaian, Haluk E. Karaca, and Mohammad H. Elahinia. "Experimental Characterization of Shape Memory Alloys." In Shape Memory Alloy Actuators, 239–77. Chichester, UK: John Wiley & Sons, Ltd, 2015. http://dx.doi.org/10.1002/9781118426913.ch7.

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Langbein, Sven, and Alexander Czechowicz. "Introduction to Shape Memory Alloy Actuators." In Shape Memory Alloy Valves, 41–72. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-19081-5_4.

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Leary, M., J. Mac, M. Mazur, F. Schiavone, and A. Subic. "Enhanced Shape Memory Alloy Actuators." In Sustainable Automotive Technologies 2010, 183–90. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-10798-6_23.

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Seelecke, Stefan. "Sensing Properties of SMA Actuators and Sensorless Control." In Shape Memory Alloy Valves, 73–87. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-19081-5_5.

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Conference papers on the topic "Shape Memory Alloy Actuators"

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Magalhães Lopes, Luzia Marcela, Maxsuel Ferreira Cunha, José Marques Basílio Sobrinho, Cícero Da Rocha Souto, Andreas Ries, Jordashe Ivys Souza Bezerra, and Euler Cássio Tavares de Macêdo. "Electronic Instrumentation for Shape Memory Alloy Actuators." In Congresso Brasileiro de Automática - 2020. sbabra, 2020. http://dx.doi.org/10.48011/asba.v2i1.1635.

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Shape memory alloy (SMA) actuators have been increasingly found applications due to their low weight and high power capacity. Additionally they are able to function as a sensor. Upon phase transformation, the material changes its electrical resistance. Phase transformation in SMAs occurs either by loading or heating the material. Since SMAs materials are usually metals, heat can be produced by passing an electric current through the alloy. This idea in mind, the present work reports the development of electronic circuits for power supply, current measurement and voltage measurement for shape memory alloy actuators. For validation of the operation of the designed circuits, a NiTi helical spring type alloy actuator was tested. The actuator was mounted on a mechanical platform; it was possible to determine its thermal behavior and force generation. Characteristic operation curves of the helical spring type actuator are presented.
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Brown, Ben. "Shape memory alloy actuators for XR." In SPIE AR, VR, MR Industry Talks 2022. SPIE, 2022. http://dx.doi.org/10.1117/12.2632494.

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Czechowicz, Alexander, Jonas Böttcher, Sebastian Mojrzisch, and Sven Langbein. "High Speed Shape Memory Alloy Activation." In ASME 2012 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/smasis2012-8213.

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Due to their ability to change into a previously imprinted actual shape through the means of thermal and electrical activation, shape memory alloys (SMA) are suitable as actuators. To apply these smart materials to a wide range of high-speed applications like valves or safety systems, an analysis of the application potential is required. The detection of inner electrical resistance of SMA actuators allows gauging the actuator’s stroke. By usage of a microcontroller a smart system without any hardware sensors can be realized which protects the system from overheating during high-current activation. The publication concentrates on different experimental data on high-speed actuation under 20ms and the potentials in the field of industrial applications. The paper gives an overview about different controlling methods for SMA-actuators, experiments concerning the resistance behavior of SMA and the development of systems using a resistance control feedback signal during high-speed activation.
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Pagel, Kenny, Welf-Guntram Drossel, Wolfgang Zorn, André Bucht, and Holger Kunze. "Adaptive Control Concept for Shape Memory Alloy Actuators." In ASME 2013 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/smasis2013-3042.

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Machine tools for small work pieces are characterized by an extensive disproportion between workspace and cross section. This is mainly caused by limitations in the miniaturization of drives and guidance elements, since their physical working principle necessitates certain minimum sizes. Due to their high specific workloads and relatively small spatial requirements, Thermal Shape-Memory-Alloys (SMA) possesses an outstanding potential to serve as miniaturized positioning devices in small machines. Antagonistically arranged SMA actuators are especially feasible to fulfill these requirements. This paper describes an adaptive closed loop control concept for actuators based on spring loaded or antagonistic arrangements of electrically-heated SMA elements. Due to their nonlinear stress-strain behavior such actuators are characterized by strain dependent load conditions at the activated SMA element. Consequently the actuator dynamic depends on its position. Hence an adaptive closed loop control concept to ensure a constant actuator dynamic over the entire stroke has to be developed. The approach is based on the determination of the transient transfer dynamics of the SMA Element. Two possible strategies are investigated and evaluated. Numerical models of both SMA wire arrangements are used to develop the adaptive control theoretically. An SMA wire test bench is designed to investigate the proof of the adaptive approach experimentally. Measurements of a conventional PI control are further compared to the achieved results of the new concept.
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Atulasimha, Jayasimha, and Inderjit Chopra. "Behavior of Torsional Shape Memory Alloy Actuators." In 44th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2003. http://dx.doi.org/10.2514/6.2003-1558.

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Tohyama, Osamu, Shigeo Maeda, Kazuhiro Abe, and Manabu Murayama. "Shape memory alloy actuators and their reliability." In International Symposium on Microelectronics and MEMS, edited by Jung-Chih Chiao, Lorenzo Faraone, H. Barry Harrison, and Andrei M. Shkel. SPIE, 2001. http://dx.doi.org/10.1117/12.448956.

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Davidson, Frank M., Chen Liang, and Don W. Lobitz. "Investigation of torsional shape memory alloy actuators." In 1996 Symposium on Smart Structures and Materials, edited by Inderjit Chopra. SPIE, 1996. http://dx.doi.org/10.1117/12.239069.

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Lammering, Rolf. "Smart structures with shape memory alloy actuators." In Smart Structures and Materials: Second European Conference, edited by Alaster McDonach, Peter T. Gardiner, Ron S. McEwen, and Brian Culshaw. SPIE, 1994. http://dx.doi.org/10.1117/12.184799.

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Kim, Wonhee, Brent Utter, Jonathan Luntz, Diann Brei, Hanif Muhammad, and Paul Alexander. "Model-Based Shape Memory Alloy Wire Ratchet Actuator Design." In ASME 2013 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/smasis2013-3333.

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Shape Memory Alloy (SMA) wire ratchet actuators overcome SMA wire strain limitations by accumulating actuation stroke over multiple cycles. The underlying architecture is effective for producing large strokes from a small package, creating continuous rotation or extended displacement, and precise. It also provides discrete positioning with zero-power hold. While there have been several successful implementations of SMA ratchet actuators, most are designed ad-hoc since limited models exist to predict the stroke and force interaction during actuation cycles. Since the SMA wire actuation is highly dependent on the forces experienced through the ratchet mechanism, a model requires the prediction of the force interaction between the rack and pawl teeth along with friction in the device, and of the external force variation over actuation cycles due to the relative position change between the external system and the SMA wire. This paper presents a model-based systematic design methodology for SMA ratchet actuator which actuates position-dependent external systems. A generalized ratchet mechanism and operation sequence is introduced along with a force balance model for both austenite and martensite equilibrium to address the mechanical coupling changes. Analytical kinematic and kineto-static rack and pawl interaction models are reviewed, which feed into the force balance models. The effective stroke is evaluated by subtracting backlash from the SMA wire stroke, found through equilibrium with the mechanism and external system. This effective stroke accumulates to produce the overall actuator motion. A design methodology is suggested along with visualization methods to aid design decisions. Parametric studies expose the effects of design parameters on the SMA ratchet actuator to gain further design insight. This model-based design foundation and parametric understanding enable the synthesis of SMA wire ratchet actuators.
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Pagounis, Emmanouel, and Markus Laufenberg. "New Ferromagnetic Shape Memory Alloy Production and Actuator Concepts." In ASME 2012 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/smasis2012-8042.

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Over the past decade ferromagnetic shape memory alloys (FSMA) have been the subject of intensive R&D work due to their potential in actuators, sensors, and intelligent systems. These smart materials can elongate and contract up to 10% when subjected to moderate magnetic fields, generating thus motion and force. Typically FSMA materials are alloys of Ni-Mn-Ga with various off-stoichiometric compositions. A new production approach based on commercially available machinery is introduced in this paper. Large single crystals have been produced demonstrating homogeneous structure and excellent magneto-mechanical properties. The properties of actuator elements (sticks) are presented as well as the influence of the alloy microstructure. The FSMA elements are used to develop prototype actuator and sensor devices for industrial and automotive applications. In this respect a benchmark between an FSMA actuator and a commercially available solenoid actuator has indicated that the FSMA technology offers potential to replace several of today’s electromagnetic actuators by advanced FSMA solutions, especially when temperature requirements are met.
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Reports on the topic "Shape Memory Alloy Actuators"

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Crews, John H., and Ralph C. Smith. Modeling and Bayesian Parameter Estimation for Shape Memory Alloy Bending Actuators. Fort Belvoir, VA: Defense Technical Information Center, February 2012. http://dx.doi.org/10.21236/ada556967.

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Johnson, A. D. Shape-Memory Alloy Tactical Feedback Actuator. Phase 1. Fort Belvoir, VA: Defense Technical Information Center, August 1990. http://dx.doi.org/10.21236/ada231389.

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Inman, Daniel J. Shape Memory Actuators for Tab-Assisted Control Surfaces. Fort Belvoir, VA: Defense Technical Information Center, May 2000. http://dx.doi.org/10.21236/ada377471.

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Crone, Wendy C., Arhur B. Ellis, and John H. Perepezko. Nanostructured Shape Memory Alloys: Composite Materials with Shape Memory Alloy Constituents. Fort Belvoir, VA: Defense Technical Information Center, March 2004. http://dx.doi.org/10.21236/ada423479.

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Baz, Amr M., Karim R. Iman, and John J. McCoy. Active Control of Flexible Space Structures Using the Nitinol Shape Memory Actuators. Fort Belvoir, VA: Defense Technical Information Center, October 1987. http://dx.doi.org/10.21236/ada205948.

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Pollard, Eric L., and Christopher H. Jenkins. Shape Memory Alloy Deployment of Membrane Mirrors for Spaceborne Telescopes. Fort Belvoir, VA: Defense Technical Information Center, January 2005. http://dx.doi.org/10.21236/ada443511.

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Brinson, L. C. Novel Processing for Creating 3D Architectured Porous Shape Memory Alloy. Fort Belvoir, VA: Defense Technical Information Center, March 2013. http://dx.doi.org/10.21236/ada586593.

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Birman, Victor. Functionally Graded Shape Memory Alloy Composites Optimized for Passive Vibration Control. Fort Belvoir, VA: Defense Technical Information Center, November 2006. http://dx.doi.org/10.21236/ada459593.

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Brinson, L. Catherine Catherine, and Aaron Stebner. MICROSTRUCTURE ANISOTROPY EFFECTS ON FRACTURE AND FATIGUE MECHANISMS IN SHAPE MEMORY ALLOY MARTENSITES. Office of Scientific and Technical Information (OSTI), December 2019. http://dx.doi.org/10.2172/1579299.

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Seward, Kirk P. A new mechanical characterization method for thin film microactuators and its application to NiTiCi shape memory alloy. Office of Scientific and Technical Information (OSTI), June 1999. http://dx.doi.org/10.2172/13579.

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