Adaptive Dampers Employing Magnetorheological Valves Filled with Porous Media

The effects of porous media selection on the performance of a porous-valve-based magnetorheological (MR) bypass damper are evaluated. Important media parameters affecting the damper performance, i.e. porosity and tortuosity, are identified using flow analysis. The relationship between the controllable force of the damper and porous valve characteristics is studied for five distinct porous media. Damper performance is compared between the different porous media configurations, with primary attention given to maximum controllable force and damping coefficient. Effects of piston-valve area ratio on damper performance are also determined. A model, based on a multi-channel flow analysis of MR fluid flow through porous media, is used to evaluate the efficiency of the magnetic circuit.

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