Research Article
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 | | mm3 | 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 | | mm3 | Initial compression (lower) chamber MR fluid volume | 71250 | | mm3 | Coil turns | 120 | N | — | Coil resistance | 1.0 | Rc | Ω | Nondimensional viscosity ratio (est.) | 0.1 | γ | — | Yield stress number (est.) | 0.5 | δ | — |
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