Optimal location of an active segment of magnetorheological fluid layer in a sandwich plate

Abstract

In the present study a sandwich plate, of rectangular form, with magnetorheological (MR) fluid core is investigated. The plate consists of two outer layers made of aluminium and an MR fluid layer in between. The plate edges are clamped. It was assumed that the aluminium layers are pure elastic. The energy is dissipated in MR fluid layer. Additional assumptions concerning displacements, deformations and stresses are introduced in calculations. The active segment of MR fluid layer is placed in various parts of plate. The optimal positions of active segment for selected modes of vibration are determined.

Dynamic characteristics and control of magnetorheological/electrorheological sandwich structures: A state-of-the-art review

“…For instance, the MR fluid treatments closed to the supports of simply supported and clamped sandwich beams yielded higher modal damping factors corresponding to all the modes. Snamina (2011) employed the classical plate theory and energy method to find optimal number and locations of the MR segments in the core layer of a sandwich plate to maximize the energy dissipation of the structure. The objective function was considered as…”

“…The design of a partially treated MR/ER sandwich structure requires finding an appropriate configuration of the treatments so that it yields the maximum controllability and vibration suppression capability of the structure in terms of stiffness and damping. For this purpose, different optimization problems on MR/ER sandwich structures have been formulated (Mohammadi and Sedaghati, 2012c; Rajamohan et al, 2010b; Snamina, 2011). Rajamohan et al (2010b) proposed three optimization problems to investigate the effect of MR layout on dynamic responses of partially treated MR beam.…”

“…Snamina (2011) employed the classical plate theory and energy method to find optimal number and locations of the MR segments in the core layer of a sandwich plate to maximize the energy dissipation of the structure. The objective function was considered as…”

Application of smart electro-rheological dampers in semi-active control of electro-rheological sandwich plates with nanocomposite facesheets rested on orthotropic visco-Pasternak foundation

“…In order to describe the motion of a three-layered sandwich plate which consists of ER core and nanocomposite facesheets, the following assumptions can be expressed as [21,22]: (i) there is no slip at the interface of ER core and nanocomposite facesheets; (ii) all points placed on normal to the plate in its equilibrium state move with the same transverse displacement; (iii) the Young's modulus of the ER fluid is negligibly small compared with the nanocomposite facesheets and thus, the normal stresses in the ER fluid core are neglected. Based on the classical plate theory (CPT), the displacement fields of nanocomposite facesheets can be given by [23]:…”

Wave propagation analysis of a rectangular sandwich composite plate with tunable magneto-rheological fluid core

“…They illustrated that by enhancing the magnetic field severity, the modal loss factor, unlike the natural frequency, decreases. In other researches, desirable position of an active part in a sandwich plate with MR layer was conducted by Snamina (2011). Gedik et al (2012) indicated stable dynamic demeanor of a MR fluid layer between two fixed plates subjected to an identical magnetic field.…”