Graphical analysis and synthesis of feedback control systems II — Synthesis

WITH THE USE OF the method presented in Part I,1 it is possible to develop several suitable procedures for the analysis and synthesis of feedback control systems. The purpose of all these procedures is to reduce the characteristic equation to a form where the unknown parameters would take part only in the co-ordinates of the working point M(a1, a0). It is thereby achieved that changes in the values of parameters affect only the position of the working point and not the shape of the curve Tƹ. As a consequence, it is possible to estimate almost instantaneously all roots of the characteristic equation for any set of values of the unknown parameters and to select the latter without difficulty.