SEMI-ACTIVE DAMPER WITH MAGNETORHEOLOGICAL SUSPENSION
Pages 44-54
Gheorghe Catana
Abstract
The semi-active damper with magnetorheological suspension is made up of a cylinder with piston.
There is an outer interchangeable nozzle between the cylinder compartments. The magnetic field
created in the nozzle, by an electromagnet, changes the viscosity of the magnetorheological suspension
(particles average diameter: 2.14 µm; volumetric fraction: 11.5%). A traction test machine has
highlighted the traction - compression force as function of the magnetic field intensity (max. 68kA*m-1)
for piston driving speeds (6mm/min, 10mm/min, and 220 mm/min) and nozzle diameters of 0.9mm and
1.9 mm. The force multiplication coefficient, under the presence of the magnetic field, does not depend
on the nozzle diameter. Its maximum value is 20, for piston driving speeds of 6 mm/min., and for
magnetic field intensities of 68 kA*m-1.