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Journal ArticleDOI

Vibration analysis of a multi-layer beam containing magnetorheological fluid

01 Jan 2010-Smart Materials and Structures (IOP Publishing)-Vol. 19, Iss: 1, pp 015013
TL;DR: In this paper, the authors investigated the properties of a multi-layered beam with MR fluid as a sandwich layer between the two layers of the continuous elastic structure and formulated the governing equations of a multilayer MR beam in the finite element form and using the Ritz method.
Abstract: Magnetorheological (MR) materials exhibit rapid variations in their rheological properties when subjected to varying magnetic field and thus offer superior potential for applications in smart structures requiring high bandwidth. MR sandwich structures can apply distributed control force to yield variations in stiffness and damping properties of the structure in response to the intensity of the applied magnetic field and could thus provide vibration suppression over a broad range of external excitation frequencies. This study investigates the properties of a multi-layered beam with MR fluid as a sandwich layer between the two layers of the continuous elastic structure. The governing equations of a multi-layer MR beam are formulated in the finite element form and using the Ritz method. A free oscillation experiment is performed to estimate the relationship between the magnetic field and the complex shear modulus of the MR materials in the pre-yield regime. The validity of the finite element and Ritz formulations developed is examined by comparing the results from the two models with those from the experimental investigation. Various parametric studies have been performed in terms of variations of the natural frequencies and loss factor as functions of the applied magnetic field and thickness of the MR fluid layer for various boundary conditions. The forced vibration responses of the MR sandwich beam are also evaluated under harmonic force excitation. The results illustrate that the natural frequencies could be increased by increasing the magnetic field while the magnitudes of the peak deflections could be considerably decreased, which demonstrates the vibration suppression capability of the MR sandwich beam.
Citations
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Journal ArticleDOI
TL;DR: The need for attention directed to the variable stiffness strategy is recognised and the significance of intensive research activities in a highly integrated and multidisciplinary environment emphasised if higher maturity stages of the concepts are to be reached.

244 citations

Journal ArticleDOI
TL;DR: In this article, the authors investigated the properties and vibration responses of a partially treated multi-layer magnetorheological (MR) fluid beam and formulated the governing equations of a multi-layered MR beam using finite element method and Ritz formulation.

114 citations

Journal ArticleDOI
TL;DR: In this paper, the authors proposed a semi-active control of the vibrations of a cantilever sandwich beam filled with an elastomer, which can be directly applied to engineering vibrating structural elements, for example helicopter rotors, aircraft wings, pads under machines, and vehicles.

76 citations

Journal ArticleDOI
TL;DR: A comprehensive review of magnetorheological and electrorheological fluids in adaptive sandwich structures has been presented in this paper, mainly for the purpose of vibration control, where the authors focus on methods of characterizing the magnetors in the pre-yield region, magnetic/electric field-dependent phenomenological models describing the storage and loss moduli of fluids, experimental and analytical methods developed for vibration analysis of sandwich structures with magnetors.
Abstract: During past four decades, applications of magnetorheological and electrorheological fluids in adaptive sandwich structures have been widely studied, primarily for the purpose of vibration control. The rapid response time of controllable magnetorheological/electrorheological fluids to an applied magnetic/electric field and reversible variations in their stiffness and damping properties have been the key motivations for adaptive structures applications. This article presents a comprehensive review of the reported studies on applications of magnetorheological/electrorheological fluids for realizing active and semi-active vibration suppression in sandwich structures. The review focuses on methods of characterizing the magnetorheological/electrorheological fluids in the pre-yield region, magnetic/electric field-dependent phenomenological models describing the storage and loss moduli of fluids, experimental and analytical methods developed for vibration analysis of sandwich structures with magnetorheological/el...

62 citations


Cites background or methods or result from "Vibration analysis of a multi-layer..."

  • ...…which was reported in several studies (Allahverdizadeh et al., 2012, 2013a, 2013c, 2014; Choi et al., 1989a, 1989b, 1989c; Choi and Park, 1994; Rajamohan et al., 2010a, 2010b, 2010c; Sepehrinour and Nezami, 2012; Yalcintas and Coulter, 1995a, 1995b, 1995c; Yeh and Shih, 2005), can be…...

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  • ...Some studies have considered the effect of the sealant and spacer in the mathematical modeling (Allahverdizadeh et al., 2013c, 2014; Bishay et al., 2010; Kang et al., 2001; Lee, 1995; Rajamohan et al., 2010a, 2010b, 2010c)....

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  • ...…of the MR/ER sandwich structures (Allahverdizadeh et al., 2012, 2013a, 2013c, 2014; Bishay et al., 2010; Hirunyapruk et al., 2010; Lee, 1995; Mohanty, 2013; Nayak et al., 2012b; Rajamohan et al., 2010a, 2010b, 2010c, 2013; Rezaeepazhand and Pahlavan, 2008a; Wei et al., 2011; Zhou et al., 2006)....

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  • ...For this purpose, different optimization problems on MR/ER sandwich structures have been formulated (Mohammadi and Sedaghati, 2012c; Rajamohan et al., 2010b; Snamina, 2011)....

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  • ...It is worth noting that partially treated MR- or ER-based sandwich structures may provide superior damping performance compared to the fully treated ones, while having less weight (Rajamohan et al., 2010c; Yalcintas and Coulter, 1998)....

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Journal ArticleDOI
TL;DR: In this article, the authors investigated the effect of a magnetic field on the variation of the natural frequencies and loss factors of a laminated composite magnetorheological (MR) fluid sandwich plate under various boundary conditions.
Abstract: This study investigates the dynamic properties of a laminated composite magnetorheological (MR) fluid sandwich plate. The governing differential equations of motion of a sandwich plate embedding a MR fluid layer as the core layer and laminated composite plates as the face layers are presented in a finite element formulation. The validity of the developed finite element formulation is demonstrated by comparing the results in terms of the natural frequencies derived from the present finite element formulation with those in the available literature. Various parametric studies are also performed to investigate the effect of a magnetic field on the variation of the natural frequencies and loss factors of the MR fluid composite sandwich plate under various boundary conditions. Furthermore, the effect of the thickness of the MR fluid layer and the ply orientation of the composite face layers on the variation of the natural frequencies and loss factors are studied. The free vibration mode shapes under various boundary conditions of a MR fluid laminated composite sandwich plate are also presented. The forced vibration response of a MR fluid composite plate is investigated to study the dynamic response of the sandwich plate under harmonic force excitations in various magnetic fields. The study suggests that the natural frequency increases with increasing magnetic field, irrespective of the boundary conditions. The reduction in peak deflection at each mode under a harmonic excitation force with variation of the applied magnetic field shows the effectiveness of the MR fluid layer in reducing the vibration amplitude of the composite sandwich plate.

56 citations

References
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Journal ArticleDOI
TL;DR: In this paper, the authors review the recent and rapid developments in semi-active structural control and its implementation in full-scale structures, and present an alternative to active and hybrid control for structural vibration reduction.
Abstract: In recent years, considerable attention has been paid to research and development of structural control devices, with particular emphasis on alleviation of wind and seismic response of buildings and bridges. In both areas, serious efforts have been undertaken in the last two decades to develop the structural control concept into a workable technology. Full-scale implementation of active control systems have been accomplished in several structures, mainly in Japan; however, cost effectiveness and reliability considerations have limited their wide spread acceptance. Because of their mechanical simplicity, low power requirements, and large, controllable force capacity, semiactive systems provide an attractive alternative to active and hybrid control systems for structural vibration reduction. In this paper we review the recent and rapid developments in semiactive structural control and its implementation in full-scale structures.

1,179 citations

Journal ArticleDOI
TL;DR: In this article, the transverse displacement of a three-layer sandwich beam with a viscoelastic core is derived in terms of the transversal displacement, w, for a 3D beam.

785 citations

Journal ArticleDOI
TL;DR: In this paper, the performance of magnetorheological dampers for seismic response reduction is examined and the results indicate that the MR damper is quite effective for structural response reduction over a wide class of seismic excitations.
Abstract: In this paper, the efficacy of magnetorheological (MR) dampers for seismic response reduction is examined. To investigate the performance of the MR damper, a series of experiments was conducted in which the MR damper is used in conjunction with a recently developed clipped-optimal control strategy to control a three-story test structure subjected to a one-dimensional ground excitation. The ability of the MR damper to reduce both peak responses, in a series of earthquake tests, and rms responses, in a series of broadband excitation tests, is shown. Additionally, because semi-active control systems are nonlinear, a variety of disturbance amplitudes are considered to investigate the performance of this control system over a variety of loading conditions. For each case, the results for three clipped-optimal control designs are presented and compared to the performance of two passive systems. The results indicate that the MR damper is quite effective for structural response reduction over a wide class of seismic excitations.

574 citations

Journal ArticleDOI
G Z Yao1, Fook Fah Yap1, G Chen1, Weihua Li1, S H Yeo1 
TL;DR: In this article, a semi-active control of vehicle suspension system with magnetorheological (MR) damper is presented and performance testing is done for this damper with INSTRON machine.

449 citations