Multiphysics Model of an MR Damper including Magnetic Hysteresis

Table 1

MR damper dimensions and material properties.

Name	Value	Symbol	Unit
Geometry and weight
Piston rod outer diameter	12	d	mm
Piston outer diameter	36	Dp	mm
Annular gap height	0.65	h	mm
Active zone length	16	La	mm
Core length	37	Lc	mm
Piston stroke	150	Ls	mm
Internal diameter of the gap	28	Dc	mm
Floating piston weight	0.07	mf	kg
MR fluid properties (MRF-132DG [32])
MR fluid viscosity at 40°C	0.114		Pa·s
MR fluid isothermal bulk modulus	1500		MPa
MR fluid density	3090		kg·m^−3
Air content in the MR fluid	0.01	α	—
Gas chamber
Gas volume (at midstroke)	46000		mm^3
Gas temperature	40	T	°C
Initial gas pressure	30		bar
Initial floating piston position	20		mm
Others
Initial rebound chamber (upper) MR fluid volume	63333		mm^3
Initial compression (lower) chamber MR fluid volume	71250		mm^3
Coil turns	120	N	—
Coil resistance	1.0	Rc	Ω
Nondimensional viscosity ratio (est.)	0.1	γ	—
Yield stress number (est.)	0.5	δ	—