Since the discovery of shape memory in titaniumnickel, a number of inventions. Development of thermal switches based on shape memory alloy actuators. Shape memory alloy wires to ensure mechanical actions if stimulated with electrical current allows the development of simple, more compact and. Modeling of smart concrete beams with shape memory alloy. The method is capable of compensating for the hysteretic behavior present in these materials and thus qualifies for high frequency applications where conventional methods fail.
The concrete column is modeled as a continuous system, using the lagrangian formulation, and linear quadratic regulator lqr is used for the control system, and shape memory alloy sma for actuation. Thermal activated shape memory alloys are materials able to recover their original shape, after an external deformation, if heated above a characteristic temperature. Soft and smart modular structures actuated by shape memory. Often, they are used as actuators in robotic applications. Modeling of smart concrete beams with shape memory alloy actuators. Hybrid composite actuator with shape retention capability. The analysis and design of smart structures involves a highly multidisciplinary effort which includes structures, materials, dynamics, control and design. S0964172603646094 control of shape memory alloy actuator using pulse width modulation nmaandgsong smart materials and structures laboratory, department of mechanical engineering, university of houston, houston, tx 77204, usa received 25 february 2002 published 25 september 2003. The nitinol bar used in this actuator is, in fact, with twoway shape memory, i.
If these materials subjected to an appropriate thermomechanical process, they have ability to return to their initial shape. Dec 20, 2012 shape memory alloys actuators sma actuators. Seelecke, s, muller, i 2004 shape memory alloy actuators in smart structures. In this work, an overview of smart structures based on sma actuators is. Soft and smart modular structures actuated by shape memory alloy. Since the discovery of shape memory in titaniumnickel, a number of inventions have been made having applications in medicine, aerospace, automotive, and consumer products. A shape memory alloybased soft morphing actuator capable of. Shape memory alloy sma materials are widely used as an actuating source for bending actuators due to their high power density.
Electrochemical actuators, which are base on the change of volume that takes place during electricallycontrolled chemical reactions. Adaptive control concept for shape memory alloy actuators. Sma wire actuators are embedded into both surface of the composite antenna. Design optimization of structures with shape memory alloy. In numerous studies, it was emphasised that only a few of patented shape memory alloy applications are commercially successful due to material limitations combined with a lack of material and desig. This is a limitation that the consortium for the advancement of shape memory alloy research and technology casmart has attempted to remedy through collaborative research and publications. Madden, in dielectric elastomers as electromechanical transducers, 2008.
Improving the speed of shape memory alloy actuators by faster electrical heating. Haywardvariable structure control of shape memory alloy actuators. Aerospace applications of shape memory alloys sage journals. Shape memory alloys are worth mentioning in this overview of actuator technologies because. Snehal prasoon contents introduction smart materials new material requirements classification of smart materials properties of shape memory alloys smart structure components of smart structure sensors and actuators structural uses of smas case study conclusion references. Smart materials and structures active vibration control of a flexible cantilever beam using shape memory alloy actuators to cite this article.
Pdf shape memory alloys smas have been used for a wide variety of applications in various fields such as robotics. Similarly, the austenite structure receives its name from steel alloys of a similar structure. Each sma wire is shape set to an initial curvature and inserted along the neutral axis. Parts made of shape memory alloys can be lightweight, solidstate alternatives to conventional actuators such as hydraulic. Then, details will be presented about piezoelectric, electrostrictive, magnetostrictive, and shape memory alloy materials that are used in the construction of inducedstrain actuators. Shape memory means the alloys return to their original condition when heated, whereas superelasticity allows large deformations with limited or no residual strain. Some examples of smart materials are piezoceramics, shape memory alloys smas, magnetorheological mr. Shape memory alloys shape memory alloy deformation. An optimal control method is proposed for shape memory alloy actuators in smart structures. Related content high temperature shape memory alloy ni50. Shape memory alloys and intelligent systems laboratory lamsi. Shape memory alloys free download as powerpoint presentation.
This paper presents a computational model and design optimization strategy for shape memory alloy sma flexural actuators. Shape memory alloy an overview sciencedirect topics. A shapememory alloy is an alloy that can be deformed when cold but returns to its predeformed remembered shape when heated. An overview of shape memory alloycoupled actuators and. Proceedings of the asme 20 conference on smart materials, adaptive structures and intelligent systems. Applications of shape memory alloys in civil structures. Such an integration of structure and actuator can also be. One common limitation on the exploitation of sma actuators across these fields has been the relative lack of basic and reliable design tools. Shapememory actuators are used where a large force and stroke are required and thermodynamic efficiency is not essential. Feasibility of ironbased shape memory alloy strips for. Jul 21, 2010 deformable mirrors actuated by smart structures are promising devices for next generation astronomical instrumentation. Proceedings of the asme 2018 conference on smart materials, adaptive structures and intelligent systems. Towards highfrequency shape memory alloy actuators. The focus is on the aspects of modeling and simulation of.
A shape memory alloy is an alloy that can be deformed when cold but returns to its predeformed remembered shape when heated. Mar 30, 2009 in this paper, utility of smart structures is illustrated through an elevated water tank concrete column. The importance of shape memory materials smms was not recognised until william buehler and frederick wang re. It may also be called memory metal, memory alloy, smart metal, smart alloy. Smart structures for deformable mirrors actuated by shape. Effect of shape memory alloys partial transformation on the response of morphing structures encompassing shape memory alloy wire actuators 25 april 2019 journal of intelligent material systems and structures, vol. Stateoftheart of shape memory actuators tini alloy. Saunders rn, hartl dj, boyd jg, lagoudas dc 2015 modeling and development of a twisting wing using inductively heated shape memory alloy actuators. Active control of smart shape memory alloy composite flapper for. Smart structures offer the opportunity to create engineered material systems that are empowered with sensing, actuation, and artificial intelligence features.
The application of shape memory alloys sma as actuators in smart structures is a. Design optimization of structures with shape memory alloy member actuators michele pachikara chair of the supervisory committee. Smart materials and structures paper engineering design framework for a shape memory alloy coil spring actuator using a static twostate model to cite this article. Shapememory alloys possess a number of unique characteristics, such as shape memory and superelasticity. A shape memory alloy based tendondriven actuation system for biomimetic artificial fingers, part ii. Shape memory alloy sma is the generic name given to alloys that exhibit the unusual property of a strain memory which can be induced either mechanically or thermally. A finite element framework for a shape memory alloy actuated finger.
These actuators consist of curved sma wires embedded within elastic structures. This book provides a systematic approach to realizing niti shape memory alloy actuation, and is aimed at science and engineering students who would like to develop a better understanding of the behaviors of smas, and learn to design, simulate, control, and fabricate these actuators in a systematic approach. Feb 22, 2016 shape memory alloy is one type of smart material. Shape memory alloys smas have been used for a wide variety of applications in various fields such as robotics. Journal of intelligent material systems and structures. Shape memory alloy sma is a suitable candidate for actuator in the smart structure design as it can be activated to alter the shape of the structure. Shape memory alloy sma is a novel functional material and has found increasing applications in many areas. The broad aim of this dissertation is also to pro vide a users guide to the design of smabased actuators. Pagel, kenny, drossel, welfguntram, zorn, wolfgang, bucht, andre, and kunze, holger. Long shape memory alloy tendonbased soft robotic actuators. Realtime optimal control of shape memory alloy actuators in. Soft and smart modular structures actuated by shape memory alloy sma wires as tentacles of soft robots. Smart structures and materials 1 smart structures and materials smart systems structures definition of smart systems structures the definition of smart structures was a topic of controversy from the late 1970s to the late 1980s.
Eli livne, professor aeronautics and astronautics a capability was developed to perform massminimization of a truss with sma actuation to determine optimal element diameters and actuator applied temperature changes. Voigt, immanuel, drossel, welfguntram, eppler, christoph, pagel, kenny, and bucht, andre. The smart soft composite ssc actuator uses pair of niti shape memory alloy sma wires embedded in a crossshaped polydimethylsiloxane pdms matrix at constant and opposite eccentricity across. Modeling and analysis of smabased adaptive structures. Pdf modeling of shape memory alloy actuators using likhachevs. Performance analysis of smart composite structure using shape. Engineering design framework for a shape memory alloy coil. Active position control of a shape memory alloy wire actuated. Shape memory alloys actuators sma actuators youtube. However, due to the slow actuation speed of smas, there are. A control system for achieving rapid controlled motions from shape memory alloy sma actuator wires. Rau is the expert for shape memory alloys assemblies made of shape memory alloys are used as thermal actuators in the automotive industry as well in further fields of measurement and control technolog, appliance technology, aviation industry as well as medical technology.
More interesting thing with this bar is that, very little transformation rotation can be induced by mechanically cycling between 8. In order to arrive at a consensus for major terminology, a special. To meet these challenges, smart structures employing shape memory alloy actuators are being researched. Active vibration control of a flexible cantilever beam. Multiobjective design optimization of a shape memory alloy. Applications of shape memory alloys in structural engineering.
Smart materials and structures paper a validated model for induction heating of shape memory alloy actuators to cite this article. Shape memory alloyactuated prestressed composites with application to morphing automotive fender skirts venkata siva c chillara1, leon m headings1,ryoheitsuruta2, eiji itakura3, umesh gandhi2 and marcelo j dapino1 abstract this work presents smart laminated composites that enable morphing vehicle structures. Johnson tini alloy company, san leandro, ca, usa abstract shape memory actuators are used where a large force and stroke are required and thermodynamic efficiency is not essential. This article introduces a novel design for a soft morphing actuator capable of pure twisting motion through a pair of shape memory alloy wires embedded in a polydimethylsiloxane matrix at constant. Proceedings volume 2715, smart structures and materials 1996. Pdf a smart soft actuator using a single shape memory. Some generic concepts about smart structures and inducedstrain active materials actuators will be given first. It may also be called memory metal, memory alloy, smart metal, smart alloy, or muscle wire. Download citation shape memory alloy actuators in smart structures. Pdf design and implementation of fast output sampling. Design and implementation of fast output sampling feedback control for shape memory alloy actuated structures article pdf available in smart structures and systems 84 october 2011 with 198. The use of shape memory alloys smas has increasingly expanded in recent decades. Recently, research efforts have been extended to using sma for control of civil structures. Development of thermal switches based on shape memory alloy.
806 346 1518 78 736 1312 294 929 238 1492 1308 733 6 125 1241 675 919 1299 687 1462 329 259 508 329 541 782 454 221 1253 647 1385 88 1046