Abstract
Magnetorheological (MR) fluids and dampers have wide advances as smart materials because of its unique properties, notably, viscosity increases in the presence when magnetic field applied MR Fluids composed of three key components, including carrier fluid, surfactants and metal particles. The major applications of MR Fluids are in brakes, dampers, journal bearings, fluid clutches, pneumatic artificial muscles, aerospace etc. where electrical energy is converted to mechanical energy (Damping Force) in a controlled manner. Within a few milliseconds the fluid converts from liquid to semi solid state. Over the years, researchers were concerned on the ways to enhance the modelling precision. Though the proposed Dynamic models of MR Dampers represent displacement and force behaviour. In this review paper, the advances of MR Fluids, MR Damper, Damper Models, Energy harvesting and their applications for seismic resistance of structures are briefly discussed in the present study.
Highlights
MR Fluid consists of magnetic iron particles and carrier oil
To achieve self-powered mechanism in MR damper some energy harvesting devices to be added in buildings to resist seismic forces
Electro Magnetic Induction (EMI) system without controllers and sensors attached in large scale construction using MR damper the input seismic force is proportional to output electric energy as depicted in Figure 11 [26]
Summary
MR Fluid consists of magnetic iron particles and carrier oil. Under a magnetic field the rheological characteristics of the MR fluid can be changed rapidly in a controlled fashion [1]. Viscosity of the Magnetorheological fluid depends on magnitude and direction of the applied magnetic field and shear rate. In most applications of magnetorheological fluids, response time of MRFs has the greatest importance. This time varies in the range of 10-20 milliseconds depending on magnetic circuit design. A magnetorheological fluid based on its composition and flux density is able to demonstrate dynamic yield stress up to 100 kPa [2,3,4].
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