We designed and validated a rotary magnetorheological (MR) damper with a specified damping torque capacity, an unsaturated magnetic flux density (MFD), and a high magnetic field intensity (MFI) for unmanned vehicle suspension systems. In this study, for the rotary type MR damper to have these satisfactory performances, the roles of the sealing location and the cover case curvature of the MR damper were investigated by using the detailed 3D finite element model to reflect asymmetrical shapes and sealing components. The current study also optimized the damper cover case curvature based on the MFD, the MFI, and the weight of the MR damper components. The damping torques, which were computed using the characteristic equation of the MR fluid and the MFI of the MR damper, were 239.2, 436.95, and 576.78 N·m at currents of 0.5, 1, and 1.5 A, respectively, at a disk rotating speed of 10 RPM. These predicted damping torques satisfied the specified damping torque of 475 N·m at 1.5 A and showed errors of less than 5% when compared to experimental measurements from the MR damper manufactured by the proposed design. The current study could play an important role in improving the performance of rotary type MR dampers.
Magnetorheological (MR) and electrorheological (ER) fluids possess rheological or flow properties that can be controllably altered by the application of electric or magnetic fields, respectively. These fluids typically consist of dispersions of micrometer-sized dielectric or soft ferro (ferri) magnetic particles that become aligned in the presence of an external electric or electrical magnetic field, respectively. Such patterns in the material, which disappear when the field is removed, cause the material to resist mechanical deformation. This controllable property of the fluids allows them to be used in adaptive-passive actuators.
This paper presents the results of a preliminary experimental investigation into the performance of the MR fluids in a linear vibration damper. A squeeze-flow MR fluid damper is used to suppress vibrations of a simply supported beam. Four different MR fluids are compared.
This paper discusses the issue of seeking reduced energy requirements of a magnetorheological (MR) fluid damper for vibration control through semi-active methods, without suffering unacceptable losses in performance. An experimental study is presented in which an MR fluid damper is used to suppress vibrations in a simply-supported beam under harmonic excitation. Two semi-active control approaches are compared to the “fully-on” control situation. The results show that the MR damper can be activated only for part of the vibration cycle and still provide significant vibration suppression.
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