describes the system free movement which is defined by the system dynamic properties.
The steady-state process of a control system means its behavior after the termination of its transient process (on condition that and ).
The system free movement represents the system behavior after the moment when this system was forced to leave its equilibrium state being effected by some input action (we suppose that this input action has a limited duration).
Fig.2 The transient process of the 2nd order under-damped control system
where is the dimensionless damping ratio,and is the natural frequencyof the
system.
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