Download or read book Modeling and Control of Ferromagnetic Shape Memory Alloy Actuators written by Honghao Tan and published by . This book was released on 2006 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ferromagnetic Shape Memory Alloy materials such as Ni-Mn-Ga have attracted significant attention over the last few years. As actuators, these materials offer high bandwidth, large stroke, and high displacement resolutions. In this dissertation, the main interests are to model the constitutive behavior of Ni-Mn-Ga under simultaneously changing fields and stress and design new actuator based on Ni-Mn-Ga.

Download or read book Shape Memory Alloy Actuators written by Mohammad H. Elahinia and published by John Wiley & Sons. This book was released on 2016-01-19 with total page 297 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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. Several innovative biomedical applications of SMAs are discussed. These include orthopedic, rehabilitation, assistive, cardiovascular, and surgery devices and tools. To this end unique actuation mechanisms are discussed. These include antagonistic bi-stable shape memory-superelastic actuation, shape memory spring actuation, and multi axial tension-torsion actuation. These actuation mechanisms open new possibilities for creating adaptive structures and biomedical devices by using SMAs.

Download or read book Dynamic Modeling and Control System Design for Shape Memory Alloy Actuators written by In Seon Kim and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Methods for Modeling and Control of Systems with Hysteresis of Shape Memory Alloy Actuators written by Yu Feng Wang and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Modeling and Controlling of Shape Memory Alloy Actuator written by David Arifin and published by . This book was released on 1989 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Methods for Modeling and Control of Systems with Hysteresis of Shape Memory Alloy Actuators written by Yufeng Wang and published by . This book was released on 2006 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hysteresis widely exists in smart materials such as shape memory alloys (SMAs), piezoelectrics, magnetorheological (MR) fluids, electrorheological (ER) fluids and so on. It severely affects the applicability of such materials in actuators and sensors. In this thesis, problems of modeling and control of systems with hysteresic SMAs actuators are studied. The approaches are also applicable to control of a wide class of smart actuators. Hysteresis exhibited by SMAs actuators is rate-independent when the input frequency is low, and can be modeled by a classical Preisach model or a KP model. The classical Preisach hysteresis model is a foundation of other hysteresis models. In this thesis, traditional methods are explained in advance to identify and implement the classical Preisach model. Due to the extremely large amount of computation involved in the methods, a new form of the Preisach model, linearly parameterized Preisach model, is introduced, and then an effective method to implement the model is presented. The KP model is a more effective operator to describe the Preisach class of hysteresis than the Preisach model. The relationship between the two models is revealed to verify the effectiveness of the KP model. Also, a linearly parameterized KP model is proposed. For both of the Preisach hysteresis model and the KP hysteresis model, algorithms of inverse hysteresis operators are developed, and simulations for modeling and inverse compensation are conducted. Since the Preisach model and the KP model can only describe hysteresis which has saturation states and reverse curves with zero initial slopes, a novel hysteresis model is defined to overcome these shortcomings. The newly defined hysteresis model is a low dimensional hysteresis model and can describe hysteresis which has revertible linear parts and reverse curves with non-zero initial slopes. The problems for controlling systems with input hysteresis have been pursued along three different paths: inverse compensation, gradient adaptive control and robust adaptive control for linear and nonlinear systems. Control schemes of open-loop inverse compensation and gradient adaptive inverse compensation for the Preisach hysteresis model are explored to eliminate the effects of the hysteresis when the output of the hysteretic actuator is measurable. Usually hysteresis of smart actuator in systems is not exactly known, but it can be approximately modeled via the linearly parameterized KP model. For a known linear system preceded by an unknown actuator hysteresis, a model reference control scheme combining with an adaptive inverse compensation is designed for tracking control of the systems. While an unknown linear system preceded by an unknown actuator hysteresis, a model reference adaptive control scheme together with an adaptive inverse compensation is developed for tracking control of the system. Simulations for both cases have been performed to illustrate the control methods. Finally, when hysteresis of smart actuator in systems has a non-measurable output and is modeled via the KP model or the newly defined model, a novel robust adaptive control configuration is presented for tracking control of systems. The analysis for the stability and the convergence of the control systems is conducted. Simulations are performed to verify the effectiveness of the novel control method.

Download or read book Modeling and Control of Shape Memory Alloy Actuator and Its Application to a Hexapod Biomimetic Robot written by 劉書宏 and published by . This book was released on 2009 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Characterization and Modeling of Ferromagnetic Shape Memory NiMnGa Actuators written by Xiang Wang and published by . This book was released on 2008 with total page 109 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: It has been shown that a magnetic field induced strain (MFIS) up to 10% can be obtained when Ferromagnetic Shape Memory Alloys (FSMAs) in the NiMnGa system are driven by perpendicular magnetic field and mechanical stresses. Prior experiments on single crystal NiMnGa have demonstrated the existence of reversible strains along the [001] crystallographic axis of a cylindrical rod under the application of collinear magnetic fields and stresses. This unusual behavior is used in this paper to develop a dynamic model for NiMnGa as operated in a solenoid transducer consisting of a driving coil and an external mass-spring-damper loading. A constitutive model to describe the motion of twin boundaries in the presence of energetically strong pinning sites is presented. The effective pinning strength is represented by an internal bias stress oriented transversely. This also explains the reduced maximum MFIS of -0.41% compared to possible -6% obtained from its variant structure. Stochastic homogenization is then used to account for variability in the bias stresses throughout the material and inhomogeneity in the interaction field intensity. Finally, the internal rod dynamics are modeled through force balancing with boundary conditions dictated by the constructive details of the transducer and mechanical load. The model is formulated in variational form, resulting in a second-order temporal system with magnetic field induced strain as the driving mechanism. Model results are compared with experimental measurements for validation and parameter identification. To provide a theoretical understanding of the frequency-dependent power losses in NiMnGa, this dissertation also extends the constitutive hysteresis model by incorporating eddy current and magnetic domain configuration(anomalous) losses; the analytical solutions are compared with finite element simulations. Finally, a parametric analysis of NiMnGa actuator performance based on energy delivery efficiency and the energy conversion efficiency is provided. The optimal stiffness ratios from the classical linear constitutive model and our nonlinear model are experimentally validated. The approach presented is useful for designing a control system, especially for the purpose of designing an energy efficient control system.

Download or read book Modeling and Control of Precision Actuators written by Tan Kok Kiong and published by CRC Press. This book was released on 2018-10-08 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modeling and Control of Precision Actuators explores new technologies that can ultimately be applied in a myriad of industries. It covers dynamical analysis of precise actuators and strategies of design for various control applications. The book addresses four main schemes: modeling and control of precise actuators; nonlinear control of precise actuators, including sliding mode control and neural network feedback control; fault detection and fault-tolerant control; and advanced air bearing control. It covers application issues in the modeling and control of precise actuators, providing several interesting case studies for more application-oriented readers. Introduces the driving forces behind precise actuators Describes nonlinear dynamics of precise actuators and their mathematical forms, including hysteresis, creep, friction, and force ripples Presents the control strategies for precise actuators based on Preisach model as well as creep dynamics Develops relay feedback techniques for identifying nonlinearities such as friction and force ripples Discusses a MPC approach based on piecewise affine models which emulate the frictional effects in the precise actuator Covers the concepts of air bearing stages with the corresponding control method Provides a set of schemes suitable for fault detection and accommodation control of mechanical systems Emphasizing design theory and control strategies, the book includes simulation and practical examples for each chapter; covers precise actuators such as piezo motors, coil motors, air bearing motors, and linear motors; discusses integration among different technologies; and includes three case studies in real projects. The book concludes by linking design methods and their applications, emphasizing the key issues involved and how to implement the precision motion control tasks in a practical system. It provides a concise and comprehensive source of the state-of-the-art developments and results for modeling and control of precise actuators.

Download or read book position control with magnetic shape memory actuators written by Leonardo Riccardi and published by Lulu.com. This book was released on 2012-02-26 with total page 209 pages. Available in PDF, EPUB and Kindle. Book excerpt: Magnetic shape memory alloys are promising materials for several applications, such as positioning systems. This book presents the main features of those materials, and then addresses the problem of controlling magnetic shape memory positioning actuators. Two control approaches are introduced, namely a PID control and an adaptive control based on adaptive hysteresis compensation. They are able to handle the presence of hysteresis in the input-output characteristic. The adaptive approach also handles the temperature-dependent behaviour of the nonlinearity. Experimental results performed on several actuator prototypes demonstrate the effectiveness of the control approaches presented here.

Download or read book Modeling and Design of One Dimensional Shape Memory Alloy Actuators written by Guhan Kumar and published by . This book was released on 2000 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt: The motion of these actuators are modeled for both compression and expansion processes. Experiments are carried out using load cells at various displacements of the actuators, in order to determine the force outputs at various displacements. The experimental results are compared with the models. The force-deflection curves would be expected to correlate to the stress-strain curves because force is analogous to stress and displacement, to strain. These, and other observed phenomena are explained from the point of view of shape memory alloy behavior. There has not been much research dedicated towards designing linear shape memory actuators that would be able to travel both inward and outward depending on the user input from a remote control, which is basically what this research aims to do. A detailed study has also been carried out on the force-displacement relations of these actuators and correlated with the observed behavior of shape memory alloys, which again is a novel feature of this research. The main advantage of shape memory alloys over other smart materials is that they have a very high recoverable strain and force output. These factors contribute chiefly to various potential and existing applications. These compensate for the main disadvantages associated with SMAs, which are heat loss and high power requirements.

Download or read book Adaptive Inverse Modeling of a Shape Memory Alloy Wire Actuator and Tracking Control with the Model written by Bong Su Koh and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: It is well known that the Preisach model is useful to approximate the effect of hysteresis behavior in smart materials, such as piezoactuators and Shape Memory Alloy(SMA) wire actuators. For tracking control, many researchers estimate a Preisach model and then compute its inverse model for hysteresis compensation. However, the inverse of its hysteresis behavior also shows hysteresis behavior. From this idea, the inverse model with Kransnoselskii-Pokrovskii(KP) model, a developed version of Preisach model, can be used directly for SMA position control and avoid the inverse operation. Also, we propose another method for the tracking control by approximating the inverse model using an orthogonal polynomial network. To estimate and update the weight parameters in both inverse models, a gradient-based learning algorithm is used. Finally, for the SMA position control, PID controller, adaptive controllers with KP model and adaptive nonlinear inverse model controller are compared experimentally.

Download or read book Nonlinear Science And Complexity Proceedings Of The Conference written by Albert C J Luo and published by World Scientific. This book was released on 2006-12-09 with total page 556 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume provides useful tools in Lie group analysis to solve nonlinear partial differential equations. Many of important issues in nonlinear wave dynamics and nonlinear fluid mechanics are presented: Homotopy techniques are used to obtain analytical solutions; fundamental problems and theories in classic and quantum dynamical systems are discussed; and numerous interesting results about dynamics and vibration in sensor and smart systems are presented. Interval computation and nonlinear modeling in dynamics and control are also briefly included.

Download or read book Design of Shape Memory Alloy SMA Actuators written by Ashwin Rao and published by Springer. This book was released on 2015-05-08 with total page 137 pages. Available in PDF, EPUB and Kindle. Book excerpt: This short monograph presents an analysis and design methodology for shape memory alloy (SMA) components such as wires, beams, and springs for different applications. The solid-solid, diffusionless phase transformations in thermally responsive SMA allows them to demonstrate unique characteristics like superelasticity and shape memory effects. The combined sensing and actuating capabilities of such materials allows them to provide a system level response by combining multiple functions in a single material system. In SMA, the combined mechanical and thermal loading effects influence the functionality of such materials. The aim of this book is to make the analysis of these materials accessible to designers by developing a "strength of materials" approach to the analysis and design of such SMA components inspired from their various applications with a review of various factors influencing the design process for such materials.

Download or read book Thermomechanical Modeling and Analysis of Flexible Structures with Shape Memory Alloy Actuators written by Steven Gongming Shu and published by . This book was released on 1996 with total page 177 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Proceedings of the ASME Aerospace Division written by American Society of Mechanical Engineers. Aerospace Division and published by . This book was released on 2007 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Shape Memory Microactuators written by Manfred Kohl and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 265 pages. Available in PDF, EPUB and Kindle. Book excerpt: Overview of recent achievements, describing the microactuator development of microvalves and liner actuators comprehensively from concept through prototype. Further key aspects included are three-dimensional models for handling complex SMA actuator geometries and coupled simulation routines that take multifunctional properties into account. Mechanical and thermal optimization criteria are introduced for actuator design, allowing an optimum use of the shape memory effect. It is shown that some of the prototypes presented, e.g. SMA microgrippers, already outperform conventional components.