Patent ID: 6886819

Claim:
A controllable magnetorheological damping device comprising a stationary housing, a movable piston and a field generator, and characterized by a design (working) gap of from 0.08 mm to 0.90 mm, said device containing magnetic-responsive particles from a single atomization process population stream dispersed in a carrier fluid (MR fluid), said particles are characterized by 10% volume (D 10 ) of particles of 2 Î¼m up to and including a D 10 of 5 Î¼m; a 50% volume of particles (D 50 ) of 8 Î¼m up to and including a D 50 of 15 Î¼m; and 90% volume of particles (D 90 ) of 25 Î¼m, up to and including a D 90 of 40 Î¼m; and wherein said single process population exhibits a least squares regression from log normal distribution (R 2 ) of 0.77 and higher.