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Damping torque can be provided by:
(a) air friction damping
(b) fluid friction damping
(c) eddy current damping.
In air friction damping, a light piston moves with a very small clearance in air chamber.
The piston moves against pressure of air in air chamber.
In fluid friction damping, light varies are attached to spindle of moving system. The movement of spindle is suppressed due to fluid friction, Eddy current damping is one of the most efficient method of damping. It is based on the principle that whenever a sheet of conducting but non magnetic material like copper or aluminum moves in magnetic field, eddy currents are induced.
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