A theoretical and experimental study of magnetostrictive mini-actuators.
TL;DR: In this paper, the authors present a theoretical framework, validated experimentally, to develop an magnetostrictive mini-actuator (MMA) and its feasibility for vibration control.
Abstract: The magnetostrictive mini-actuator (MMA), with its unique characteristics such as large strain, high force and high energy density, is potentially a new class of actuator most suitable for distributed actuator applications such as vibration control of smart structures. The authors present a theoretical framework, validated experimentally, to develop an MMA and its feasibility for vibration control. Based on two-dimensional thermal analysis, the general form of thermoelastic mathematical model for characterizing magnetostrictive-based actuators is proposed and experimentally validated. Thermal effects, at other than the initial state, are shown to have a significant effect on attainable strain and force of an MMA. Experimental results show that the MMA has good static and dynamic performance, and is suitable for applications in smart structures.
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TL;DR: A variety of state-of-the-art MPT configurations and their applications will be reviewed along with the working principle of this transducer type.
200 citations
TL;DR: In this paper, a general formulation of the problem based on classical and shear deformation (the first-order as well as the third-order) theories is presented, and analytical solutions of the equations are developed for simply supported boundary conditions.
Abstract: Laminated composite beams containing magnetostrictive layers are modeled as distributed parameter systems and the magnetostrictive layers are used to control the vibration suppression. Velocity feedback with constant gain distributed controller is chosen to achieve vibration suppression. A general formulation of the problem based on classical and shear deformation (the first-order as well as the third-order) theories is presented, and analytical solutions of the equations are developed for simply supported boundary conditions. The effect of material properties, lamination scheme, and placement of the magnetostrictive layers on vibration suppression is investigated.
81 citations
TL;DR: In this article, the transient response of laminated composite plates with embedded smart material layers is studied using a unified plate theory that includes the classical, first-order, and third-order plate theories.
77 citations
Book•
30 Dec 2013TL;DR: In this article, the authors focus on smart materials, structures and systems, which are also referred to as intelligent, adaptive, active, sensory and metamorphic, and the purpose of these materials from the perspective of smart systems is their ability to minimize life-cycle cost and/or expand the performance envelope.
Abstract: The twenty-first century could be called the 'Multifunctional Materials Age' The inspiration for multifunctional materials comes from nature, and therefore these are often referred to as bio-inspired materials Bio-inspired materials encompass smart materials and structures, multifunctional materials and nano-structured materials This is a dawn of revolutionary materials that may provide a 'quantum jump' in performance and multi-capability This book focuses on smart materials, structures and systems, which are also referred to as intelligent, adaptive, active, sensory and metamorphic The purpose of these materials from the perspective of smart systems is their ability to minimize life-cycle cost and/or expand the performance envelope The ultimate goal is to develop biologically inspired multifunctional materials with the capability to adapt their structural characteristics (such as stiffness, damping and viscosity) as required, monitor their health condition, perform self-diagnosis and self-repair, morph their shape and undergo significant controlled motion over a wide range of operating conditions
72 citations
References
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01 Jan 1985
TL;DR: In this paper, heat transfer: a basic approach, heat transfer, a basic heat transfer approach, Heat transfer, basic approach for heat transfer in a basic way, Heat Transfer: a Basic approach for Heat transfer.
Abstract: Heat transfer: a basic approach , Heat transfer: a basic approach , مرکز فناوری اطلاعات و اطلاع رسانی کشاورزی
842 citations
01 Jan 1988
TL;DR: Legvold et al. as discussed by the authors measured the basal plane magnetostrictions of Tb and Dy at low temperatures, which are 100 to 10000 times typical magnetostrains and still remain the largest known (~1%).
Abstract: By the early 1960’s, it was widely recognized that the rare earths possessed many extraordinary magnetic properties. Neutron diffraction measurements, for example, showed that the spin structures were much more complex than those of any of the classical ferromagnets or antiferromagnets. More importantly, in the heavy rare earth metals, the parallel coupling of large orbital and large spin angular momenta yielded huge magnetic moments of 9μ B and 10μ B, dwarfing the conventional values of 0.6 for Ni and 2.2 for Fe. Enormous magnetic anisotropies were also encountered in the heavy rare earth elements. In 1963, a breakthrough in magnetostrictive materials occurred with the measurement of the basal plane magnetostrictions of Tb and Dy at low temperatures (Legvold et al. 1963, Clark et al. 1963, 1965, Rhyne and Legvold 1965). These basal plane strains are 100 to 10000 times typical magnetostrictions and still remain today the largest known (~1%). Over wide temperature ranges, thermal expansions are dominated by the temperature dependences of the magnetostrains. Elastic moduli were found to be strongly influenced by the unprecedented magnetoelastic interactions. However, because of the low ordering temperatures of the rare earths the application of these magnetostrictive properties to devices operating at room temperature could not be achieved with the elements. Only Gd, which is essentially non-magnetostrictive, possesses a Curie point as high as room temperature.
240 citations
TL;DR: In this article, a model of twinned dendritic Terfenol-D was proposed, in which the magnetization of one twin jumps between two directions while the remaining twin undergoes a continuous rotation of the magnetisation.
Abstract: Large ‘‘jumps’’ in the magnetostriction have been observed in twinned single crystals of Tb03Dy07Fe19 (Terfenol‐D) for magnetic fields parallel to the crystalline [112] direction The interpretation of these large magnetostriction discontinuities is based upon a model of twinned dendritic Terfenol‐D in which the magnetization of one twin jumps between two [111] directions while the magnetization of the remaining twin undergoes a continuous rotation of the magnetization The field dependence of the magnetization and magnetostriction of cubic single crystals with λ111≫λ100 was calculated using an expression which included the anisotropy constants K1 and K2 and compressive loads along [112] With K1=−06 J/m3 and K2=−20 J/m3 (values appropriate for Terfenol‐D near room temperature), magnetization ‘‘jumping’’ is predicted For the twinned crystal, the jump in the magnetostriction was calculated to be greater than 1000 ppm Because of this large magnetostriction, it is possible to configure a device to p
225 citations
TL;DR: In this paper, a special magnetostrictive material (terfenol) is used to reduce and/or alter unwanted vibrational motions in an actuator (termed a mount) described in this paper.
81 citations
TL;DR: The recently developed "Giant" magnetostrictive material, Terfenol-D, has been applied to development of a new class of adaptive actuators for vibration control.
Abstract: The recently developed "Giant" magnetostrictive material, Terfenol-D, has been applied to development of a new class of adaptive actuators for vibration control Terfenol-D offers the highest strai
44 citations