Active control of beam with magnetostrictive layer
TL;DR: In this article, the damping properties of a distributed magnetostrictive layer bonded to an aluminum beam for different boundary conditions and coil configurations are analyzed. But the authors focus on damping characteristics obtained using a distributed magnetic layer and its current carrying actuating coil.
About: This article is published in Computers & Structures.The article was published on 2003-05-01. It has received 44 citations till now. The article focuses on the topics: Beam (structure) & Electromagnetic coil.
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TL;DR: In this paper, a partial mixed layerwise finite element model for adaptive plate structures is presented by considering a Reissner mixed variational principle, and the mixed functional is formulated using transverse stresses, displacement components and electric and magnetic potentials as primary variables.
148 citations
TL;DR: In this paper, a simulation of vibration suppression of a laminated composite beam embedded with actuators of a giant magnetostrictive material subjected to control magnetic fields is presented, and the results show that this proposed approach is efficient not only in a linear zone but also in nonlinear zones (dead zone and saturation zone) in vibration suppression.
Abstract: This paper presents a simulation of vibration suppression of a laminated composite beam embedded with actuators of a giant magnetostrictive material subjected to control magnetic fields. It has been found that the strains generated in the material are not only significantly larger than ones created by many other smart materials but also exhibit some inherent nonlinearities. To utilize the full potential of these materials in active vibration control, these nonlinearities should be characterized in the control system as accurately as possible. In this simulation of nonlinear dynamic controls, the control law with negative velocity feedback and the analytical nonlinear constitutive model of the magnetostrictive layer are employed. The numerical results show that this proposed approach is efficient not only in a linear zone but also in nonlinear zones (dead zone and saturation zone) of magnetostrictive curves in vibration suppression. Compared with those from the control system based on the linear constitutive relations of the material, it is found that the simulation results based on the linear model are efficient only when the magnetostrictive relations are located in the linear zone. Once the system has some departure from the linear zone, however, the results from the linear model become unacceptable. Finally, the effect of material properties, lamination schemes and location of the magnetostrictive layers on vibration suppression of the practical system is evaluated.
55 citations
Cites background from "Active control of beam with magneto..."
...actuator layers [12–17], where the constitutive relations for magnetostrictive materials are employed by linear constitutive relations such that the control system becomes linear....
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...In such cases, those investigations [12–17] of active control for the vibration suppression of beam/plate structures on the basis of the linear constitutive relations, or the linear piezomagnetic model (see figure 2 for typical constitutive curves) will be possibly disabled when the applied conditions, e....
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TL;DR: In this article, a nonlinear and coupled constitutive model for giant magnetostrictive materials (GMM) is employed to predict the active vibration suppression process of cantilever laminated composite plate with GMM layers.
32 citations
TL;DR: In this article, a regular variational boundary element formulation for dynamic analysis of two-dimensional magneto-electro-elastic domains is presented, where the domain variables are approximated by using a superposition of weighted regular fundamental solutions of the static magnetoelectroelastic problem and the boundary variables are expressed in terms of nodal values.
Abstract: In this paper a regular variational boundary element formulation for dynamic analysis of two-dimensional magneto-electro-elastic domains is presented. The method is based on a hybrid variational principle expressed in terms of generalized magneto-electro-elastic variables. The domain variables are approximated by using a superposition of weighted regular fundamental solutions of the static magneto-electro-elastic problem, whereas the boundary variables are expressed in terms of nodal values. The variational principle coupled with the proposed discretization scheme leads to the calculation of frequency-independent and symmetric generalized stiffness and mass matrices. The generalized stiffness matrix is computed in terms of boundary integrals of regular kernels only. On the other hand, to achieve meaningful computational advantages, the domain integral defining the generalized mass matrix is reduced to the boundary through the use of the dual reciprocity method, although this implies the loss of symmetry. A purely boundary model is then obtained for the computation of the structural operators. The model can be directly used into standard assembly procedures for the analysis of non-homogeneous and layered structures. Additionally, the proposed approach presents some features that place it in the framework of the weak form meshless methods. Indeed, only a set of scattered points is actually needed for the variable interpolation, while a global background boundary mesh is only used for the integration of the influence coefficients. The results obtained show good agreement with those available in the literature proving the effectiveness of the proposed approach.
26 citations
TL;DR: In this article, the vibration study of a simply supported smart sandwich plate embedded in an elastic substrate medium is presented in hygrothermal environment, and the effects of temperature rise, degree of moisture concentration, elastic foundations parameters, thickness ratio, aspect ratio and thickness ratio of magnetostrictive layer to viscoelastic layer, modes, lamination schemes, magnitude of the feedback coefficient, position of the magnetstrictive layers and visco-elastic structural damping coefficient on controlled motion and vibration characteristics of plate.
Abstract: In hygrothermal environment, vibration study of a simply supported smart sandwich plate embedded in an elastic substrate medium is presented in the present article. The sandwich plate contains layers of fiber-reinforced and magnetostrictive materials and core of viscoelastic material. The kinematic equations system is derived via employing Hamilton's principle with considering the transverse shear strains with and without the normal strains effect. Various numerical examples are carried out to study the effects of temperature rise, degree of moisture concentration, elastic foundations parameters, thickness ratio, aspect ratio, thickness ratio of magnetostrictive layer to viscoelastic layer, modes, lamination schemes, magnitude of the feedback coefficient, position of the magnetostrictive layers and viscoelastic structural damping coefficient on controlled motion and vibration characteristics of plate. Some observation about influences of the temperature and humidity concentrations on vibration characteristics of studied plate are presented in detail. The outcomes indicate that the hygrothermal environments have negative effects on vibration suppression of advanced composite structures especially the uniform hygrothermal distribution. The frequencies increase with increasing the viscoelastic structural damping coefficient and the foundation constants.
26 citations
References
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TL;DR: In this article, the Jiles-Atherton mean field theory for ferromagnetic hysteresis was combined with a quadratic moment rotation model for magnetostriction.
Abstract: This paper addresses the modeling of strains generated by magnetostrictive transducers in response to applied magnetic fields. The measured strains depend on both the rotation of moments within the material in response to the field and the elastic properties of the material. The magnetic behavior is characterized by considering the Jiles-Atherton mean field theory for ferromagnetic hysteresis in combination with a quadratic moment rotation model for magnetostriction. Elastic properties must be incorporated to account for the dynamics of the material as it vibrates. This is modeled by force balancing, which yields a wave equation with magnetostrictive inputs. The validity of the resulting transducer model is illustrated by comparison with experimental data.
214 citations
TL;DR: In this paper, a laminated composite beam, representative of a flexible beam, containing a layer of magnetostrictive material, is considered as a distributed parameter system and its dynamic behavior has been investigated.
84 citations
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