Investigation on Magnetorheological Damper for Its Various Applications
Abstract: – Magneto Rheological damper is a special type of damper that is filled with Magnetorheological fluids which can be controlled by magnetic field using an electromagnet. These types of smart fluids change their physical properties when subjected to magnetic field and turn into visco-elastic solids in
few milliseconds. This property allows the MR damper to be used as a shock absorber by controlling its damping
characteristics by changing the intensity of electromagnet. This paper focuses on the various applications of MR dampers in latest technologies.
Keywords- Magneto rheological damper, Electro rheological damper, Vehicle, Suspension
I. INTRODUCTION
The magnetorheological damper was patented by J. David Carlson and Michael J.Chrzan on 11 Jan 1994. The discovery of MR fluids is ascribed to Jacob Rabinow in 1940’s. MR dampers are semi-active devices that are filled with magnetorheological fluids. When magnetic field is applied, the MRF varies from liquid to semi-solid state in just few milliseconds, so the outcome is an infinitely variable, controllable damper are capable of large damping forces[1]. The MR fluid is controlled by magnetic field using an electromagnet. As the electromagnet intensity increases the fluid viscosity also increases within the damper. MR dampers offer a striking solution to energy absorption in mechanical systems could be considered as “fail-safe” device. Many everyday items are already incorporating smart materials (bikes, cars, glasses, washing machines) and the number of applications for them is growing steadily.
Magnetorheological (MR) fluid is a functional fluid that changes its physical characteristics when magnetic field is applied.Magnetorheological fluids (MRFs) consist of suspended ferrous particles like carbonyl iron particles that are micron sized, and are dispersed in a carrier medium. When magnetic field is applied these suspended particles in MRF gets magnetised and align themselves in structures like chains which resists the shear deformation of fluid. This change in material results in a rapid increase in viscosity or in the formation of a semisolid state[2]–[5].