Topic summary
Critically damped
Extracted from the Wikipedia article Damping.
The damping ratio is a dimensionless measure, amongst other measures, that characterises how damped a system is. It is denoted by ζ ("zeta") and varies from undamped (ζ = 0), underdamped (ζ < 1) through critically damped (ζ = 1) to overdamped (ζ > 1).