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Journal ArticleDOI

Active control of beam with magnetostrictive layer

01 May 2003-Computers & Structures (Pergamon)-Vol. 81, Iss: 13, pp 1375-1382
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.
Citations
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Journal ArticleDOI
01 Apr 2019
TL;DR: The preliminary results prove that the application of non-linear magnetic fields to the magnetostrictive devices ensures the extension of energy harvesting bandwidth of these devices and can be used to improve their control possibilities.
Abstract: Investigations of systems with an active magnetostrictive element generally assume the presence of an external homogeneous bias magnetic field. This article, however, presents the results of a stud...

1 citations

Journal ArticleDOI
TL;DR: In this paper, a laminated composite beam on Winkler-Pasternak's medium is analyzed, which contains four smart actuating layers of magnetostrictive material to vibration control of the system with a simple constant feedback control gain distribution.
Abstract: Vibrational behavior prediction of a laminated composite beam on Winkler-Pasternak’s medium is analyzed in the present article. The proposed beam contains four smart actuating layers of magnetostrictive material to vibration control of the system with a simple constant feedback control gain distribution. The designed structure undergoes an external force in x direction and a magnetic field. A higher-order shear deformation theory with an exponential shape function is used to model the proposed system. Hamilton’s principle and Navier’s approach are used to obtain and solve the dynamic system. The natural frequencies, deflections, and suppression time of the studied system are computed for different thickness ratios, ply orientations, number and location of the magnetostrictive layers, foundation stiffness, velocity feedback gain value, and external force.

1 citations


Cites background from "Active control of beam with magneto..."

  • ...developed a finite element formulation to investigate the vibration reduction in an aluminum beam with a magnetostrictive layer for different boundary conditions [7], followed by studying the damping behavior of a titanium shell containing a magnetostrictive ply [8]....

    [...]

Journal ArticleDOI
TL;DR: In this paper, a new type of semi-active suppression method using magnetostrictive materials is introduced which contains an equipped vibrating structure with magnetstrictive patches wound by a pick-up coil connected to an electronic switch and a capacitor.
Abstract: One of the best vibration control methods using smart actuators are semi-active approaches which are as strong as active methods and need no external energy supply such as passive ones. Compared with piezoelectric-based, magnetostrictive-based control methods have higher coupling efficiency, higher Curie temperature, higher flexibility to be integrated with curved structures and no depolarization problems. Semi-active methods are well-developed for piezoelectrics but magnetostrictive-based approaches are not as efficient, powerful and well-known as piezoelectric-based methods. The aim of this work is to propose a powerful semi-active control method using magnetostrictive actuators. In this paper a new type of semi-active suppression methods using magnetostrictive materials is introduced which contains an equipped vibrating structure with magnetostrictive patches wound by a pick-up coil connected to an electronic switch and a capacitor. The novelty of the proposed damping method is switching on the coil current signal using mentioned switch and capacitor which is briefly named SSDC (synchronized switch damping on capacitor). In this paper the characteristics of the semi-active pulse-switching damping technique with magnetostrictive materials are studied and numerical results show significant damping for almost all types of excitations.

1 citations

Journal ArticleDOI
TL;DR: In this article, the sensitivity of column's safety indices to bending moment ratios is compared to axial force ratios, and the results demonstrate that column's sensitivity to bending moments is higher than that of axial forces ratios.
Abstract: Wind loads are very important in the design of tall buildings as often the load combinations containing the wind load govern the design. As for reliability, however, because of the higher inherent uncertainty in the wind load in comparison to the gravity load, safety indices decrease as the ratio of wind load to gravity load increases. The safety indices in RC columns depend on the nominal wind to gravity load ratios. Due to the interaction between bending moment and axial force, a single ratio cannot be defined, because the eccentricity is not similar for wind and gravity loads. In this paper, the ratio of wind to gravity loads is considered separately for axial force and bending moments. Unlike conventional approach, here it is assumed that the wind and gravity loads' eccentricities are not equal, and the final load eccentricity used in either the design or the reliability analysis is a function of applied loads. The results demonstrate that the sensitivity of RC columns' safety indices to bending moment ratios is higher than that of axial force ratios. Furthermore, the variation of RC columns' safety indices with a low rebar percentage is very different from RC columns with high rebar percentages.
01 Jan 2006
TL;DR: In this paper, two dynamic analytical models are developed using the Euler-Bernoulli theory and Timoshenko's theory of beams, respectively, for active vibration control of a laminated beam, which is bonded with magnetostrictive fiber reinforced composite (MFRC) and excited by an impulsive force.
Abstract: This paper focuses on modeling development for active vibration control of a laminated beam, which is bonded with magnetostrictive fiber reinforced composite (MFRC) and excited by an impulsive force. Two dynamic analytical models are developed using the Euler-Bernoulli theory and Timoshenko’s theory of beams, respectively. A feedback control algorithm coupling the MFRC sensor and actuator is used. The active control magnetic field is applied to the MFRC actuator encircled by an actuation coil, and the required magnetic flux density is obtained from the sensing coil encircling the MFRC sensor. It is revealed from the numerical study that for the considered cases, the MFRC patches is more effective for vibration suppression of a beam than the piezoelectric fiber reinforced composite (PFRC) patches. A comparison of the natural frequencies for the beams with various MFRC patches is conducted between the present analytical and finite element analysis models. A good agreement is noted.

Cites background from "Active control of beam with magneto..."

  • ...…a finite element formulation for the damping characteristics of an aluminum beam bonded with a distributed magnetostrictive layer under different boundary conditions and coil configurations [7], followed by analyzing the damping characteristics of a titanium shell with a magnetostrictive layer [8]....

    [...]

References
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Journal ArticleDOI
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

Journal ArticleDOI
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