Research on Rotary Disc-Type MRF Dampers with Nonhomogeneous Magnetic Fields

摘要

In this paper, based on the analysis of the damping torque of rotary disc-type magnetorheological fluid (MRF) damper, a new kind of MRF disc-type damper is proposed. The working disc of the new kind of damper has a wedged shape that results in variable working clearances, and hence a nonhomogeneous magnetic field is produced. The magnetic resistance of the MRF filled in the variable clearance is analyzed and the impact of the produced nonhomogeneous magnetic field on the damping torque of the damper is studied. Experiments are conducted and the damper performance under steady shear rate is evaluated with an author-designed test stand. The experimental results show that under the same exciting current and other conditions the output damping torque produced by the MRF of the new kind of damper is much greater than that of the ordinary dampers with parallel disc surfaces and constant working clearance.