Damper with magnetorheological suspension

The paper presents a closed hydraulic circuit damper, having a magnetorheological suspension as a fluid medium, and an external field coil. The magnetorheological suspension is made of iron micro-particles in silicon oil. The volume ratio of the particles (mean diameter of 2.15mum and standard deviation of 0.40mum) is 25%. In the absence of the applied magnetic field, an uniform motion of the piston with velocity v ranging from 6.6 x 10(5) to 23,33 x 10 ms (1), is produced by a mean force F-0 = 8.5 N, The driving force F increases linearly -with v, beginning with H = 7.96 kA m(-1). For H=47.60 kAm (-1) and v = 23,33 x 10(-5) ms(-1) , a ratio F/F-0 = 24 was obtained. (C) 2002 Published by Elsevier Science B.V.