Abstract: According to the Bingham model parameters from experiment in laboratory, the Eyring constitutive model parame- ters are identified via optimization of the error function of shear stress depicted by the Bingham model and Eyring model and data curve fitting. The flow equations for magnetorheological (MR) fluids in annular channel are theoretically set up using Eyring constitutive model and velocity profile of MR fluids though annular channel is obtained. The methodologies for calculating damping force are developed. If piston velocity and annular channel geometrical parameters are given, damping performances are predicated in order to determine design parameters. In the light of technical requirements for front suspension of Chanan star minibus, a MR fluid damper, which is designed and fabricated according to design method presented, has tested by electro-hydraulic servo vibrator and it’s control system in National Center for Test and Supervision of Coach Quality. The experimental results reveal that the analysis methodology and design theory are reasonable.

Key words: Bingham model, Damper, Eyring model, MR fluid