Vibration characteristics and optimal design of composite sandwich beam with partially configured hybrid MR-Elastomers
TL;DR: The free and forced vibration characteristics of a sandwich beam with composite face layers and partially configured carbon nanotubes reinforced magnetorheological elastomer (hybrid MR elastomers) are described in this article.
Abstract: The free and forced vibration characteristics of a sandwich beam with composite face layers and partially configured carbon nanotubes reinforced magnetorheological elastomer (hybrid MR elastomer) c...
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TL;DR: In this paper, the dynamic behavior of the spherical magnetorheological elastomer (MRE) sandwich shell panel with multiwalled carbon nanotubes (MWCNT) reinforced composite face sheets is studied.
Abstract: In this work, the dynamic behavior of the spherical magnetorheological elastomer (MRE) sandwich shell panel with multiwalled carbon nanotubes (MWCNT) reinforced composite face sheets is studied. Th...
12 citations
TL;DR: In this article, the instability regions of a honeycomb sandwich plate are investigated for different end conditions under periodic in-plane loading, and the core layer of the sandwich plate is made of c...
Abstract: In this study, the instability regions of a honeycomb sandwich plate are investigated for different end conditions under periodic in-plane loading. The core layer of the sandwich plate is made of c...
11 citations
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TL;DR: In this paper, the free and forced vibration characteristics of the 3D printed composite hybrid magnetorheological elastomer sandwich panel were investigated, and the authors focused on the investigation of free-and forced-vibrational properties of the composite.
Abstract: The work presented in this article is focused on the investigation of free and forced vibration characteristics of the 3D printed composite hybrid magnetorheological elastomer sandwich panel. The 3...
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TL;DR: In this paper, the authors investigated the vibration suppression capabilities of magnetorheological (MR) materials in adaptive structures by varying the externally applied magnetic field level over the MR layer, the stiffness and damping properties of the adaptive beam can be varied.
Abstract: This paper discusses the investigation of vibration suppression capabilities of magnetorheological (MR) materials in adaptive structures. Homogeneous three-layered adaptive beams with MR materials sandwiched between two elastic layers were considered. By varying the externally applied magnetic field level over the MR layer, the stiffness and damping properties of the adaptive beam can be varied. These variations in the damping and stiffness properties can be used to tune the vibration characteristics of the adaptive beams such as natural frequencies, vibration amplitudes, mode shapes and loss factors. In this study, theoretical investigation of the MR adaptive beams vibration behavior based on the energy approach is accomplished. Experiments were performed to observe the theoretically predicted vibration responses in real time. From both studies, vibration suppression capabilities of MR adaptive beams were observed in the forms of shifts in natural frequency values, variations in loss factors, and vibration amplitudes.
159 citations
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
TL;DR: In this article, the free vibration analysis of a doubly tapered magnetorheological rotating sandwich beam based on the Euler-Bernoulli theory is investigated, which is made of an elastomer core sandwiched between two elastic layers.
51 citations
TL;DR: In this paper, the double of sandwich beams which are coupled by visco-Pasternak medium are investigated, and this system is rested on Winkler found at the museum.
Abstract: In the present research, modeling and vibration analysis of the double of sandwich beams which are coupled by visco-Pasternak medium are investigated. Also, this system is rested on Winkler foundat...
47 citations
TL;DR: In this article, the modal damping characteristics of beams partially treated with magnetorheological (MR) fluid elements were studied using the finite element approach and the finite-element method.
Abstract: The modal damping characteristics of beams partially treated with magnetorheological (MR) fluid elements are studied using the modal strain energy approach and the finite element method. Different configurations of a sandwich beam partially treated with MR fluid are considered, including a beam with a cluster of MR fluid segments and a beam with arbitrarily located MR fluid segments. The significance of the location of the MR fluid segments on the modal damping factor is investigated under different end conditions. An optimization problem is formulated by combining finite element analysis with optimization algorithms based on sequential quadratic programming (SQP) and the genetic algorithm (GA) to identify optimal locations for MR fluid treatment to achieve maximum modal damping corresponding to the first five modes of flexural vibration, individually and simultaneously. The solutions of the optimization problem revealed that the GA converges to the global solutions rapidly compared to the SQP method, which in some modal configurations usually entraps in the local optimum. The results suggest that the optimal location of the MR fluid treatment is strongly related to the end conditions and also the mode of vibration. Furthermore, partial treatments with MR fluid can significantly alter the deflection modes of the beam. It has also been demonstrated that optimal locations of the MR fluid segments based on linear combination of the modal damping factors of the first five modes are identical to those obtained based on the first mode, irrespective of the end conditions. However, the optimal locations of the MR fluid segments, identified based on the logarithmic summation of the modal damping factors of the first five modes, would yield a more uniform shear energy distribution compared to that attained by considering individual modes or a linear summation of the individual modes.
47 citations