A Novel Double-Piston Magnetorheological Damper for Space Truss Structures Vibration Suppression

Table 1

Technical specifications of the prototype damper.

Parameters	Value (metric)	Value (imperial)
MRF-122EG
Viscosity @ 40°C	0.042 ± 0.020 Pa-s	—
Density	2.28–2.48 g/cm^3	—
Operating temperature	−40 to +130°C	—
Outer tube
Outer diameter	15.875 mm	5/8 in
Inner diameter	14.224 mm	0.560 in
Total length	139.7 mm	5.50 in
Inner tube
Outer diameter	14.224 mm	0.560 in
Inner diameter	12.573 mm	0.495 in
Total length	35.56 mm	1.40 in
Coil piston
Outer diameter	12.370 mm	0.487 in
Lip width	5.08 mm	0.20 in
Total length	20.32 mm	0.80 in
Gap
Gap size	0.1016 mm	0.004 in
Effective gap length	10.16 mm	0.40 in
Coil
Core diameter	6.858 mm	0.270 in
Length	10.16 mm	0.40 in
Wire gauge	—	28
Number of turns	110	110
Maximum stroke	15.24 mm	0.60 in
Weight	82 g	2.9 oz