Current change in the MR damper coil can change the stiffness and damping of the whole support system, so the vibration of high-speed rotor can be suppressed by the MR damper.

It was devoted to the relative damping measurement for overdamped geophone with a moving coil of constant velocity.

Add the workpiece fixed in the coil, coil discharge at the moment have a damping pulse magnetic field decay, so that the loss of magnetic parts.