Undamped oscillations are oured by:
Undamped oscillations are oured by a high gain and a long dead time. The high gain makes it likely that the response may overshoot the desired level. The long dead time allows the overshoot to reach a considerable value before the overshoot is corrected by the negative feedback mechanism. Thus, the oscillations continue. A good example of undamped oscillations is Cheyne - Stokes' breathing. SERVOMECHANISM: In some control systems, the set point is not a fixed entity. If the set point changes from time to time, the system is called a servomechanism. The stretch reflex which regulates muscle length is an example of a servo mechanism. The stretch reflex has a variable gain. The initial high gain increases the speed with which most of the response is completed. The low gain later reduces the oscillations in the response.
Negative feed back
Positive feed back
High gain
Feed Forward control
General Physiology