Abstract :
The paper describes some methods of constraining the output of a control system to remain within predetermined limits. No ideal technique has been found, for each method either produces transient overshoots into the forbidden range of output magnitudes or impairs the response in the normal operating region. All systems are non-linear in operation for large input signals. Conventional techniques enable the responses to be evaluated for step and sinusoidal input signals, by means of phase-plane analysis and the describing function.
