Some Problems of Equilibrium Conditions in a Second-Order Feedback System.

Properties of a second-order feedback system are dealt with in which the static characteristics of the self-adjusting members intersect each other at various points. According to the positions of these points, the system assumes stable, labile and semi-labile state. A simple geometry can be obtained for differentiating stable, labile and semi-labile systems as well as for the general interpretation of negative feedback by introducing the concept of loop factor characteristic curve of a feedback system.