Identification of MR Fluids Properties in Mechatronic Damping Elements

Abstract

Mechatronic systems often use a magnetorheological fluids for the damping of movement. A significant dependence of their rheological properties on a magnetic field is the main reason. Therefore these fluids are relatively well controllable in mechatronic systems. For correct control of these elements it is important to assign to MR fluids a suitable rheological model of behavior. This model describes flow and viscosity dependences by various magnetizing currents and various shear rates. This paper is concerned with measurement problems of flow and viscosity curves on standard and original rheometers. Based on measured data, a behavior of MR fluid can be mathematically described, a relevant model can be compiled, a behavior of different MR fluids can be compared or changes of mechanical properties during the measurement can be observed.