Limited angle rotary mr damper design and optimization of geometry

A magnetorheological (MR) fluid consists of solid particles of magnetizing nature, with a micron level dimension, placed in a carrier fluid. By activating the MR fluid under an appropriate magnetic field, there are very fast and large increases in the apparent dynamic viscosities of these fluids. A limited angle rotary (KAD) MR damper is a system in which the MR fluid is exposed to the magnetic field at the determined locus while transferring the MR fluid from one section to the other with the wing motion. It is noteworthy that KAD-MR damper's high torque damping, low energy consumption, flow characteristics can be controlled by magnetic field and can be designed in a compact structure. At the heart of this work is the development of KAD MR damper with variable viscous torque damping. At the beginning, information about MR fluid and KAD-MR damper was given, followed by design of KAD MR damper. The design was transformed into parametric and numerical analysis was carried out by performing magnetic field analysis (ANSYS Magnetostatic) and flow analysis (ANSYS-CFD), respectively. Flow analysis was performed using the Herschel-Bulkley model to account for fluid thinning or thickening effects. Herschel-Bulkley index information of MR fluid is obtained from a doctoral dissertation, density and viscosity information are taken from catalog of manufacturer's company. The profile file is written to identify the movement in the flow analysis. Analytically, a mathematical relationship has been developed to calculate the torque damping of the KAD MR damper. The geometric measurements of the KAD-MR damper, which will produce a torque damping of 90 Nm under a magnetic field of 0.6T, are determined according to the simulation results. The results show that this approach can be used for KAD MR damper design.