Damper behavior of a magnetorheological (MR) bypass damper is analyzed using hydro-mechanical modeling approach. An MR bypass damper consists of piston and double end rods in a hydraulic cylinder, and a bypass comprising cylindrical tubing and an MR valve. Damping forces are developed in the annular bypass via Poiseuille flow. A hydro-mechanical model for the MR bypass damper is derived by considering lumped hydraulic parameters, which are compliance of MR fluids inside the cylinder and flow resistance through the MR bypass valve. Numerical simulations are conducted to predict the controllable damping force due to variable yield shear stress of MR fluid, the post-yield damping due to viscosity of MR fluid, and hysteresis behavior in the low velocity domain due to the compliance effect of the fluid. A laboratory-scale MR bypass damper will be fabricated and tested in order to validate the hydro-mechanical MR damper model.
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